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  • FFMPEG Output File is Empty Nothing was Encoded (for a Picture) ?

    4 mars 2023, par Sarah Szabo

    I have a strange issue effecting one of my programs that does bulk media conversions using ffmpeg from the command line, however this effects me using it directly from the shell as well :

    


    ffmpeg -i INPUT.mkv -ss 0:30 -y -qscale:v 2 -frames:v 1 -f image2 -huffman optimal "OUTPUT.png"
fails every run with the error message :
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

    


    This only happens with very specific videos, and seemingly no other videos. File type is usually .webm. These files have been downloaded properly (usually from yt-dlp), and I have tried re-downloading them just to verify their integrity.

    


    One such file from a colleague was : https://www.dropbox.com/s/xkucr2z5ra1p2oh/Triggerheart%20Execlica%20OST%20%28Arrange%29%20-%20Crueltear%20Ending.mkv?dl=0

    


    Is there a subtle issue with the command string ?

    


    Notes :

    


    removing -huffman optimal had no effect

    


    moving -ss to before -i had no effect

    


    removing -f image2 had no effect

    


    Full Log :

    


    sarah@MidnightStarSign:~/Music/Playlists/Indexing/Indexing Temp$ ffmpeg -i Triggerheart\ Execlica\ OST\ \(Arrange\)\ -\ Crueltear\ Ending.mkv -ss 0:30 -y -qscale:v 2 -frames:v 1 -f image2 -huffman optimal "TEST.png"
ffmpeg version n5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.2.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-version3 --enable-vulkan
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
[matroska,webm @ 0x55927f484740] Could not find codec parameters for stream 2 (Attachment: none): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, matroska,webm, from 'Triggerheart Execlica OST (Arrange) - Crueltear Ending.mkv':
  Metadata:
    title           : TriggerHeart Exelica PS2 & 360 Arrange ー 16 - Crueltear Ending
    PURL            : https://www.youtube.com/watch?v=zJ0bEa_8xEg
    COMMENT         : https://www.youtube.com/watch?v=zJ0bEa_8xEg
    ARTIST          : VinnyVynce
    DATE            : 20170905
    ENCODER         : Lavf59.27.100
  Duration: 00:00:30.00, start: -0.007000, bitrate: 430 kb/s
  Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv, bt709), 720x720, SAR 1:1 DAR 1:1, 25 fps, 25 tbr, 1k tbn (default)
    Metadata:
      DURATION        : 00:00:29.934000000
  Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
    Metadata:
      DURATION        : 00:00:30.001000000
  Stream #0:2: Attachment: none
    Metadata:
      filename        : cover.webp
      mimetype        : image/webp
Codec AVOption huffman (Huffman table strategy) specified for output file #0 (TEST.png) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Stream mapping:
  Stream #0:0 -> #0:0 (vp9 (native) -> png (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'TEST.png':
  Metadata:
    title           : TriggerHeart Exelica PS2 & 360 Arrange ー 16 - Crueltear Ending
    PURL            : https://www.youtube.com/watch?v=zJ0bEa_8xEg
    COMMENT         : https://www.youtube.com/watch?v=zJ0bEa_8xEg
    ARTIST          : VinnyVynce
    DATE            : 20170905
    encoder         : Lavf59.27.100
  Stream #0:0(eng): Video: png, rgb24, 720x720 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 25 fps, 25 tbn (default)
    Metadata:
      DURATION        : 00:00:29.934000000
      encoder         : Lavc59.37.100 png
frame=    0 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=   0x    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)


    


    Manjaro OS System Specs :

    


    System:&#xA;  Kernel: 6.1.12-1-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 12.2.1&#xA;    parameters: BOOT_IMAGE=/@/boot/vmlinuz-6.1-x86_64&#xA;    root=UUID=f11386cf-342d-47ac-84e6-484b7b2f377d rw rootflags=subvol=@&#xA;    radeon.modeset=1 nvdia-drm.modeset=1 quiet&#xA;    cryptdevice=UUID=059df4b4-5be4-44d6-a23a-de81135eb5b4:luks-disk&#xA;    root=/dev/mapper/luks-disk apparmor=1 security=apparmor&#xA;    resume=/dev/mapper/luks-swap udev.log_priority=3&#xA;  Desktop: KDE Plasma v: 5.26.5 tk: Qt v: 5.15.8 wm: kwin_x11 vt: 1 dm: SDDM&#xA;    Distro: Manjaro Linux base: Arch Linux&#xA;Machine:&#xA;  Type: Desktop Mobo: ASUSTeK model: PRIME X570-PRO v: Rev X.0x&#xA;    serial: <superuser required="required"> UEFI: American Megatrends v: 4408&#xA;    date: 10/27/2022&#xA;Battery:&#xA;  Message: No system battery data found. Is one present?&#xA;Memory:&#xA;  RAM: total: 62.71 GiB used: 27.76 GiB (44.3%)&#xA;  RAM Report: permissions: Unable to run dmidecode. Root privileges required.&#xA;CPU:&#xA;  Info: model: AMD Ryzen 9 5950X bits: 64 type: MT MCP arch: Zen 3&#x2B; gen: 4&#xA;    level: v3 note: check built: 2022 process: TSMC n6 (7nm) family: 0x19 (25)&#xA;    model-id: 0x21 (33) stepping: 0 microcode: 0xA201016&#xA;  Topology: cpus: 1x cores: 16 tpc: 2 threads: 32 smt: enabled cache:&#xA;    L1: 1024 KiB desc: d-16x32 KiB; i-16x32 KiB L2: 8 MiB desc: 16x512 KiB&#xA;    L3: 64 MiB desc: 2x32 MiB&#xA;  Speed (MHz): avg: 4099 high: 4111 min/max: 2200/6358 boost: disabled&#xA;    scaling: driver: acpi-cpufreq governor: schedutil cores: 1: 4099 2: 4095&#xA;    3: 4102 4: 4100 5: 4097 6: 4100 7: 4110 8: 4111 9: 4083 10: 4099 11: 4100&#xA;    12: 4094 13: 4097 14: 4101 15: 4100 16: 4099 17: 4100 18: 4097 19: 4098&#xA;    20: 4095 21: 4100 22: 4099 23: 4099 24: 4105 25: 4098 26: 4100 27: 4100&#xA;    28: 4092 29: 4103 30: 4101 31: 4100 32: 4099 bogomips: 262520&#xA;  Flags: 3dnowprefetch abm adx aes aperfmperf apic arat avic avx avx2 bmi1&#xA;    bmi2 bpext cat_l3 cdp_l3 clflush clflushopt clwb clzero cmov cmp_legacy&#xA;    constant_tsc cpb cpuid cqm cqm_llc cqm_mbm_local cqm_mbm_total&#xA;    cqm_occup_llc cr8_legacy cx16 cx8 de decodeassists erms extapic&#xA;    extd_apicid f16c flushbyasid fma fpu fsgsbase fsrm fxsr fxsr_opt ht&#xA;    hw_pstate ibpb ibrs ibs invpcid irperf lahf_lm lbrv lm mba mca mce&#xA;    misalignsse mmx mmxext monitor movbe msr mtrr mwaitx nonstop_tsc nopl npt&#xA;    nrip_save nx ospke osvw overflow_recov pae pat pausefilter pclmulqdq&#xA;    pdpe1gb perfctr_core perfctr_llc perfctr_nb pfthreshold pge pku pni popcnt&#xA;    pse pse36 rapl rdpid rdpru rdrand rdseed rdt_a rdtscp rep_good sep sha_ni&#xA;    skinit smap smca smep ssbd sse sse2 sse4_1 sse4_2 sse4a ssse3 stibp succor&#xA;    svm svm_lock syscall tce topoext tsc tsc_scale umip v_spec_ctrl&#xA;    v_vmsave_vmload vaes vgif vmcb_clean vme vmmcall vpclmulqdq wbnoinvd wdt&#xA;    x2apic xgetbv1 xsave xsavec xsaveerptr xsaveopt xsaves&#xA;  Vulnerabilities:&#xA;  Type: itlb_multihit status: Not affected&#xA;  Type: l1tf status: Not affected&#xA;  Type: mds status: Not affected&#xA;  Type: meltdown status: Not affected&#xA;  Type: mmio_stale_data status: Not affected&#xA;  Type: retbleed status: Not affected&#xA;  Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via&#xA;    prctl&#xA;  Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer&#xA;    sanitization&#xA;  Type: spectre_v2 mitigation: Retpolines, IBPB: conditional, IBRS_FW,&#xA;    STIBP: always-on, RSB filling, PBRSB-eIBRS: Not affected&#xA;  Type: srbds status: Not affected&#xA;  Type: tsx_async_abort status: Not affected&#xA;Graphics:&#xA;  Device-1: NVIDIA GA104 [GeForce RTX 3070] vendor: ASUSTeK driver: nvidia&#xA;    v: 525.89.02 alternate: nouveau,nvidia_drm non-free: 525.xx&#x2B;&#xA;    status: current (as of 2023-02) arch: Ampere code: GAxxx&#xA;    process: TSMC n7 (7nm) built: 2020-22 pcie: gen: 4 speed: 16 GT/s lanes: 8&#xA;    link-max: lanes: 16 bus-ID: 0b:00.0 chip-ID: 10de:2484 class-ID: 0300&#xA;  Device-2: AMD Cape Verde PRO [Radeon HD 7750/8740 / R7 250E]&#xA;    vendor: VISIONTEK driver: radeon v: kernel alternate: amdgpu arch: GCN-1&#xA;    code: Southern Islands process: TSMC 28nm built: 2011-20 pcie: gen: 3&#xA;    speed: 8 GT/s lanes: 8 link-max: lanes: 16 ports: active: DP-3,DP-4&#xA;    empty: DP-1, DP-2, DP-5, DP-6 bus-ID: 0c:00.0 chip-ID: 1002:683f&#xA;    class-ID: 0300 temp: 54.0 C&#xA;  Device-3: Microdia USB 2.0 Camera type: USB driver: snd-usb-audio,uvcvideo&#xA;    bus-ID: 9-2:3 chip-ID: 0c45:6367 class-ID: 0102 serial: <filter>&#xA;  Display: x11 server: X.Org v: 21.1.7 with: Xwayland v: 22.1.8&#xA;    compositor: kwin_x11 driver: X: loaded: modesetting,nvidia dri: radeonsi&#xA;    gpu: radeon display-ID: :0 screens: 1&#xA;  Screen-1: 0 s-res: 5760x2160 s-dpi: 80 s-size: 1829x686mm (72.01x27.01")&#xA;    s-diag: 1953mm (76.91")&#xA;  Monitor-1: DP-1 pos: 1-2 res: 1920x1080 dpi: 93&#xA;    size: 527x296mm (20.75x11.65") diag: 604mm (23.8") modes: N/A&#xA;  Monitor-2: DP-1-3 pos: 2-1 res: 1920x1080 dpi: 82&#xA;    size: 598x336mm (23.54x13.23") diag: 686mm (27.01") modes: N/A&#xA;  Monitor-3: DP-1-4 pos: 1-1 res: 1920x1080 dpi: 93&#xA;    size: 527x296mm (20.75x11.65") diag: 604mm (23.8") modes: N/A&#xA;  Monitor-4: DP-3 pos: primary,2-2 res: 1920x1080 dpi: 82&#xA;    size: 598x336mm (23.54x13.23") diag: 686mm (27.01") modes: N/A&#xA;  Monitor-5: DP-4 pos: 2-4 res: 1920x1080 dpi: 82&#xA;    size: 598x336mm (23.54x13.23") diag: 686mm (27.01") modes: N/A&#xA;  Monitor-6: HDMI-0 pos: 1-3 res: 1920x1080 dpi: 93&#xA;    size: 527x296mm (20.75x11.65") diag: 604mm (23.8") modes: N/A&#xA;  API: OpenGL v: 4.6.0 NVIDIA 525.89.02 renderer: NVIDIA GeForce RTX&#xA;    3070/PCIe/SSE2 direct-render: Yes&#xA;Audio:&#xA;  Device-1: NVIDIA GA104 High Definition Audio vendor: ASUSTeK&#xA;    driver: snd_hda_intel bus-ID: 5-1:2 v: kernel chip-ID: 30be:1019 pcie:&#xA;    class-ID: 0102 gen: 4 speed: 16 GT/s lanes: 8 link-max: lanes: 16&#xA;    bus-ID: 0b:00.1 chip-ID: 10de:228b class-ID: 0403&#xA;  Device-2: AMD Oland/Hainan/Cape Verde/Pitcairn HDMI Audio [Radeon HD 7000&#xA;    Series] vendor: VISIONTEK driver: snd_hda_intel v: kernel pcie: gen: 3&#xA;    speed: 8 GT/s lanes: 8 link-max: lanes: 16 bus-ID: 0c:00.1&#xA;    chip-ID: 1002:aab0 class-ID: 0403&#xA;  Device-3: AMD Starship/Matisse HD Audio vendor: ASUSTeK&#xA;    driver: snd_hda_intel v: kernel pcie: gen: 4 speed: 16 GT/s lanes: 16&#xA;    bus-ID: 0e:00.4 chip-ID: 1022:1487 class-ID: 0403&#xA;  Device-4: Schiit Audio Unison Universal Dac type: USB driver: snd-usb-audio&#xA;  Device-5: JMTek LLC. Plugable USB Audio Device type: USB&#xA;    driver: hid-generic,snd-usb-audio,usbhid bus-ID: 5-2:3 chip-ID: 0c76:120b&#xA;    class-ID: 0300 serial: <filter>&#xA;  Device-6: ASUSTek ASUS AI Noise-Cancelling Mic Adapter type: USB&#xA;    driver: hid-generic,snd-usb-audio,usbhid bus-ID: 5-4:4 chip-ID: 0b05:194e&#xA;    class-ID: 0300 serial: <filter>&#xA;  Device-7: Microdia USB 2.0 Camera type: USB driver: snd-usb-audio,uvcvideo&#xA;    bus-ID: 9-2:3 chip-ID: 0c45:6367 class-ID: 0102 serial: <filter>&#xA;  Sound API: ALSA v: k6.1.12-1-MANJARO running: yes&#xA;  Sound Interface: sndio v: N/A running: no&#xA;  Sound Server-1: PulseAudio v: 16.1 running: no&#xA;  Sound Server-2: PipeWire v: 0.3.65 running: yes&#xA;Network:&#xA;  Device-1: Intel I211 Gigabit Network vendor: ASUSTeK driver: igb v: kernel&#xA;    pcie: gen: 1 speed: 2.5 GT/s lanes: 1 port: f000 bus-ID: 07:00.0&#xA;    chip-ID: 8086:1539 class-ID: 0200&#xA;  IF: enp7s0 state: up speed: 1000 Mbps duplex: full mac: <filter>&#xA;  IP v4: <filter> type: dynamic noprefixroute scope: global&#xA;    broadcast: <filter>&#xA;  IP v6: <filter> type: noprefixroute scope: link&#xA;  IF-ID-1: docker0 state: down mac: <filter>&#xA;  IP v4: <filter> scope: global broadcast: <filter>&#xA;  WAN IP: <filter>&#xA;Bluetooth:&#xA;  Device-1: Cambridge Silicon Radio Bluetooth Dongle (HCI mode) type: USB&#xA;    driver: btusb v: 0.8 bus-ID: 5-5.3:7 chip-ID: 0a12:0001 class-ID: e001&#xA;  Report: rfkill ID: hci0 rfk-id: 0 state: up address: see --recommends&#xA;Logical:&#xA;  Message: No logical block device data found.&#xA;  Device-1: luks-c847cf9f-c6b5-4624-a25e-4531e318851a maj-min: 254:2&#xA;    type: LUKS dm: dm-2 size: 3.64 TiB&#xA;  Components:&#xA;  p-1: sda1 maj-min: 8:1 size: 3.64 TiB&#xA;  Device-2: luks-swap maj-min: 254:1 type: LUKS dm: dm-1 size: 12 GiB&#xA;  Components:&#xA;  p-1: nvme0n1p2 maj-min: 259:2 size: 12 GiB&#xA;  Device-3: luks-disk maj-min: 254:0 type: LUKS dm: dm-0 size: 919.01 GiB&#xA;  Components:&#xA;  p-1: nvme0n1p3 maj-min: 259:3 size: 919.01 GiB&#xA;RAID:&#xA;  Message: No RAID data found.&#xA;Drives:&#xA;  Local Storage: total: 9.1 TiB used: 2.79 TiB (30.6%)&#xA;  SMART Message: Unable to run smartctl. Root privileges required.&#xA;  ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Western Digital&#xA;    model: WDS100T3X0C-00SJG0 size: 931.51 GiB block-size: physical: 512 B&#xA;    logical: 512 B speed: 31.6 Gb/s lanes: 4 type: SSD serial: <filter>&#xA;    rev: 111110WD temp: 53.9 C scheme: GPT&#xA;  ID-2: /dev/nvme1n1 maj-min: 259:4 vendor: Western Digital&#xA;    model: WDS100T2B0C-00PXH0 size: 931.51 GiB block-size: physical: 512 B&#xA;    logical: 512 B speed: 31.6 Gb/s lanes: 4 type: SSD serial: <filter>&#xA;    rev: 211070WD temp: 46.9 C scheme: GPT&#xA;  ID-3: /dev/sda maj-min: 8:0 vendor: Western Digital&#xA;    model: WD4005FZBX-00K5WB0 size: 3.64 TiB block-size: physical: 4096 B&#xA;    logical: 512 B speed: 6.0 Gb/s type: HDD rpm: 7200 serial: <filter>&#xA;    rev: 1A01 scheme: GPT&#xA;  ID-4: /dev/sdb maj-min: 8:16 vendor: Western Digital&#xA;    model: WD4005FZBX-00K5WB0 size: 3.64 TiB block-size: physical: 4096 B&#xA;    logical: 512 B speed: 6.0 Gb/s type: HDD rpm: 7200 serial: <filter>&#xA;    rev: 1A01 scheme: GPT&#xA;  ID-5: /dev/sdc maj-min: 8:32 type: USB vendor: SanDisk&#xA;    model: Gaming Xbox 360 size: 7.48 GiB block-size: physical: 512 B&#xA;    logical: 512 B type: N/A serial: <filter> rev: 8.02 scheme: MBR&#xA;  SMART Message: Unknown USB bridge. Flash drive/Unsupported enclosure?&#xA;  Message: No optical or floppy data found.&#xA;Partition:&#xA;  ID-1: / raw-size: 919.01 GiB size: 919.01 GiB (100.00%)&#xA;    used: 611.14 GiB (66.5%) fs: btrfs dev: /dev/dm-0 maj-min: 254:0&#xA;    mapped: luks-disk label: N/A uuid: N/A&#xA;  ID-2: /boot/efi raw-size: 512 MiB size: 511 MiB (99.80%)&#xA;    used: 40.2 MiB (7.9%) fs: vfat dev: /dev/nvme0n1p1 maj-min: 259:1 label: EFI&#xA;    uuid: 8922-E04D&#xA;  ID-3: /home raw-size: 919.01 GiB size: 919.01 GiB (100.00%)&#xA;    used: 611.14 GiB (66.5%) fs: btrfs dev: /dev/dm-0 maj-min: 254:0&#xA;    mapped: luks-disk label: N/A uuid: N/A&#xA;  ID-4: /run/media/sarah/ConvergentRefuge raw-size: 3.64 TiB&#xA;    size: 3.64 TiB (100.00%) used: 2.19 TiB (60.1%) fs: btrfs dev: /dev/dm-2&#xA;    maj-min: 254:2 mapped: luks-c847cf9f-c6b5-4624-a25e-4531e318851a&#xA;    label: ConvergentRefuge uuid: 7d295e73-4143-4eb1-9d22-75a06b1d2984&#xA;  ID-5: /run/media/sarah/MSS_EXtended raw-size: 475.51 GiB&#xA;    size: 475.51 GiB (100.00%) used: 1.48 GiB (0.3%) fs: btrfs&#xA;    dev: /dev/nvme1n1p1 maj-min: 259:5 label: MSS EXtended&#xA;    uuid: f98b3a12-e0e4-48c7-91c2-6e3aa6dcd32c&#xA;Swap:&#xA;  Kernel: swappiness: 60 (default) cache-pressure: 100 (default)&#xA;  ID-1: swap-1 type: partition size: 12 GiB used: 6.86 GiB (57.2%)&#xA;    priority: -2 dev: /dev/dm-1 maj-min: 254:1 mapped: luks-swap label: SWAP&#xA;    uuid: c8991364-85a7-4e6c-8380-49cd5bd7a873&#xA;Unmounted:&#xA;  ID-1: /dev/nvme1n1p2 maj-min: 259:6 size: 456 GiB fs: ntfs label: N/A&#xA;    uuid: 5ECA358FCA356485&#xA;  ID-2: /dev/sdb1 maj-min: 8:17 size: 3.64 TiB fs: ntfs&#xA;    label: JerichoVariance uuid: 1AB22D5664889CBD&#xA;  ID-3: /dev/sdc1 maj-min: 8:33 size: 3.57 GiB fs: iso9660&#xA;  ID-4: /dev/sdc2 maj-min: 8:34 size: 4 MiB fs: vfat label: MISO_EFI&#xA;    uuid: 5C67-4BF8&#xA;USB:&#xA;  Hub-1: 1-0:1 info: Hi-speed hub with single TT ports: 4 rev: 2.0&#xA;    speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900&#xA;  Hub-2: 1-2:2 info: Hitachi ports: 4 rev: 2.1 speed: 480 Mb/s&#xA;    chip-ID: 045b:0209 class-ID: 0900&#xA;  Device-1: 1-2.4:3 info: Microsoft Xbox One Controller (Firmware 2015)&#xA;    type: <vendor specific="specific"> driver: xpad interfaces: 3 rev: 2.0 speed: 12 Mb/s&#xA;    power: 500mA chip-ID: 045e:02dd class-ID: ff00 serial: <filter>&#xA;  Hub-3: 2-0:1 info: Super-speed hub ports: 4 rev: 3.0 speed: 5 Gb/s&#xA;    chip-ID: 1d6b:0003 class-ID: 0900&#xA;  Hub-4: 2-2:2 info: Hitachi ports: 4 rev: 3.0 speed: 5 Gb/s&#xA;    chip-ID: 045b:0210 class-ID: 0900&#xA;  Hub-5: 3-0:1 info: Hi-speed hub with single TT ports: 1 rev: 2.0&#xA;    speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900&#xA;  Hub-6: 3-1:2 info: VIA Labs Hub ports: 4 rev: 2.1 speed: 480 Mb/s&#xA;    power: 100mA chip-ID: 2109:3431 class-ID: 0900&#xA;  Hub-7: 3-1.2:3 info: VIA Labs VL813 Hub ports: 4 rev: 2.1 speed: 480 Mb/s&#xA;    chip-ID: 2109:2813 class-ID: 0900&#xA;  Hub-8: 4-0:1 info: Super-speed hub ports: 4 rev: 3.0 speed: 5 Gb/s&#xA;    chip-ID: 1d6b:0003 class-ID: 0900&#xA;  Hub-9: 4-2:2 info: VIA Labs VL813 Hub ports: 4 rev: 3.0 speed: 5 Gb/s&#xA;    chip-ID: 2109:0813 class-ID: 0900&#xA;  Hub-10: 5-0:1 info: Hi-speed hub with single TT ports: 6 rev: 2.0&#xA;    speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900&#xA;  Device-1: 5-1:2 info: Schiit Audio Unison Universal Dac type: Audio&#xA;    driver: snd-usb-audio interfaces: 2 rev: 2.0 speed: 480 Mb/s power: 500mA&#xA;    chip-ID: 30be:1019 class-ID: 0102&#xA;  Device-2: 5-2:3 info: JMTek LLC. Plugable USB Audio Device type: Audio,HID&#xA;    driver: hid-generic,snd-usb-audio,usbhid interfaces: 4 rev: 1.1&#xA;    speed: 12 Mb/s power: 100mA chip-ID: 0c76:120b class-ID: 0300&#xA;    serial: <filter>&#xA;  Device-3: 5-4:4 info: ASUSTek ASUS AI Noise-Cancelling Mic Adapter&#xA;    type: Audio,HID driver: hid-generic,snd-usb-audio,usbhid interfaces: 4&#xA;    rev: 1.1 speed: 12 Mb/s power: 100mA chip-ID: 0b05:194e class-ID: 0300&#xA;    serial: <filter>&#xA;  Hub-11: 5-5:5 info: Genesys Logic Hub ports: 4 rev: 2.0 speed: 480 Mb/s&#xA;    power: 100mA chip-ID: 05e3:0608 class-ID: 0900&#xA;  Device-1: 5-5.3:7 info: Cambridge Silicon Radio Bluetooth Dongle (HCI mode)&#xA;    type: Bluetooth driver: btusb interfaces: 2 rev: 2.0 speed: 12 Mb/s&#xA;    power: 100mA chip-ID: 0a12:0001 class-ID: e001&#xA;  Hub-12: 5-6:6 info: Genesys Logic Hub ports: 4 rev: 2.0 speed: 480 Mb/s&#xA;    power: 100mA chip-ID: 05e3:0608 class-ID: 0900&#xA;  Hub-13: 6-0:1 info: Super-speed hub ports: 4 rev: 3.1 speed: 10 Gb/s&#xA;    chip-ID: 1d6b:0003 class-ID: 0900&#xA;  Hub-14: 7-0:1 info: Hi-speed hub with single TT ports: 6 rev: 2.0&#xA;    speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900&#xA;  Device-1: 7-2:2 info: SanDisk Cruzer Micro Flash Drive type: Mass Storage&#xA;    driver: usb-storage interfaces: 1 rev: 2.0 speed: 480 Mb/s power: 200mA&#xA;    chip-ID: 0781:5151 class-ID: 0806 serial: <filter>&#xA;  Device-2: 7-4:3 info: ASUSTek AURA LED Controller type: HID&#xA;    driver: hid-generic,usbhid interfaces: 2 rev: 2.0 speed: 12 Mb/s power: 16mA&#xA;    chip-ID: 0b05:18f3 class-ID: 0300 serial: <filter>&#xA;  Hub-15: 8-0:1 info: Super-speed hub ports: 4 rev: 3.1 speed: 10 Gb/s&#xA;    chip-ID: 1d6b:0003 class-ID: 0900&#xA;  Hub-16: 9-0:1 info: Hi-speed hub with single TT ports: 4 rev: 2.0&#xA;    speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900&#xA;  Hub-17: 9-1:2 info: Terminus FE 2.1 7-port Hub ports: 7 rev: 2.0&#xA;    speed: 480 Mb/s power: 100mA chip-ID: 1a40:0201 class-ID: 0900&#xA;  Device-1: 9-1.1:4 info: Sunplus Innovation Gaming mouse [Philips SPK9304]&#xA;    type: Mouse driver: hid-generic,usbhid interfaces: 1 rev: 2.0 speed: 1.5 Mb/s&#xA;    power: 98mA chip-ID: 1bcf:08a0 class-ID: 0301&#xA;  Device-2: 9-1.5:6 info: Microdia Backlit Gaming Keyboard&#xA;    type: Keyboard,Mouse driver: hid-generic,usbhid interfaces: 2 rev: 2.0&#xA;    speed: 12 Mb/s power: 400mA chip-ID: 0c45:652f class-ID: 0301&#xA;  Device-3: 9-1.6:7 info: HUION H420 type: Mouse,HID driver: uclogic,usbhid&#xA;    interfaces: 3 rev: 1.1 speed: 12 Mb/s power: 100mA chip-ID: 256c:006e&#xA;    class-ID: 0300&#xA;  Hub-18: 9-1.7:8 info: Terminus Hub ports: 4 rev: 2.0 speed: 480 Mb/s&#xA;    power: 100mA chip-ID: 1a40:0101 class-ID: 0900&#xA;  Device-1: 9-2:3 info: Microdia USB 2.0 Camera type: Video,Audio&#xA;    driver: snd-usb-audio,uvcvideo interfaces: 4 rev: 2.0 speed: 480 Mb/s&#xA;    power: 500mA chip-ID: 0c45:6367 class-ID: 0102 serial: <filter>&#xA;  Device-2: 9-4:11 info: VKB-Sim &#xA9; Alex Oz 2021 VKBsim Gladiator EVO L&#xA;    type: HID driver: hid-generic,usbhid interfaces: 1 rev: 2.0 speed: 12 Mb/s&#xA;    power: 500mA chip-ID: 231d:0201 class-ID: 0300&#xA;  Hub-19: 10-0:1 info: Super-speed hub ports: 4 rev: 3.1 speed: 10 Gb/s&#xA;    chip-ID: 1d6b:0003 class-ID: 0900&#xA;Sensors:&#xA;  System Temperatures: cpu: 38.0 C mobo: 41.0 C&#xA;  Fan Speeds (RPM): fan-1: 702 fan-2: 747 fan-3: 938 fan-4: 889 fan-5: 3132&#xA;    fan-6: 0 fan-7: 0&#xA;  GPU: device: nvidia screen: :0.0 temp: 49 C fan: 0% device: radeon&#xA;    temp: 53.0 C&#xA;Info:&#xA;  Processes: 842 Uptime: 3h 11m wakeups: 0 Init: systemd v: 252&#xA;  default: graphical tool: systemctl Compilers: gcc: 12.2.1 alt: 10/11&#xA;  clang: 15.0.7 Packages: 2158 pm: pacman pkgs: 2110 libs: 495 tools: pamac,yay&#xA;  pm: flatpak pkgs: 31 pm: snap pkgs: 17 Shell: Bash v: 5.1.16&#xA;  running-in: yakuake inxi: 3.3.25&#xA;</filter></filter></filter></filter></filter></filter></vendor></filter></filter></filter></filter></filter></filter></filter></filter></filter></filter></filter></filter></filter></filter></filter></filter></filter></superuser>

    &#xA;

  • ffmpeg produces duplicate pts with "wallclock_as_timestamps 1" option on MKV

    15 avril 2024, par Jax2171

    I need to get real time reference of every keyframe captured by an IP camera. The -wallclock_as_timestamps 1 option seems to do the trick for us, however we are forced to replace the TS output container with MKV to get a correct PTS epoch value 1712996356.833000.

    &#xA;

    Here is the ffmpeg command used :

    &#xA;

    ffmpeg -report -use_wallclock_as_timestamps 1 -rtsp_transport tcp -i rtsp://user:password1@192.168.5.21/cam/realmonitor?channel=1channel1[1]=1subtype=0 -c:v copy -c:a aac -copyts -f matroska -y rec.mkv&#xA;

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    The capture process runs without any relevant worning or error messages.

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    However, playing the captured video with any player shows very short and evident but very annoying lags. Upon investigation I discovered that many frame PTSs have the same value. The command I used to show duplicate PTSs is as follows :

    &#xA;

    ffprobe -v error -show_entries frame=pkt_pts_time -select_streams v -of csv=p=0 rec.mkv | sort | uniq -d&#xA;

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    On a recording of about 10 minutes the result of the duplicate PTS is the following :

    &#xA;

    1713086493.367000&#xA;1713086493.368000&#xA;1713086493.370000&#xA;1713086493.372000&#xA;1713086543.714000&#xA;1713086558.793000&#xA;1713086558.817000&#xA;1713086558.872000&#xA;1713086561.780000&#xA;1713086564.642000&#xA;1713086564.657000&#xA;1713086564.778000&#xA;1713086565.794000&#xA;...&#xA;

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    I'm not sure if the lag problem is caused by this, however the problem does not occur with the TS container, which however I cannot use due to the PTS values being roundly 33 bit.

    &#xA;

    The -vsync 0 or -vsync 2 options on input or output didn't help.

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    This is the log using the -report option :

    &#xA;

        ffmpeg started on 2024-04-15 at 09:04:38&#xA;Report written to "ffmpeg-20240415-090438.log"&#xA;Log level: 48&#xA;Command line:&#xA;ffmpeg -report -stats -hide_banner -use_wallclock_as_timestamps 1 -rtsp_transport tcp -i "rtsp://user:password1@192.168.5.21/cam/realmonitor?channel=1channel1[1]=1subtype=0" -c:v copy -c:a aac -copyts -f matroska -y rec.mkv&#xA;Splitting the commandline.&#xA;Reading option &#x27;-report&#x27; ... matched as option &#x27;report&#x27; (generate a report) with argument &#x27;1&#x27;.&#xA;Reading option &#x27;-stats&#x27; ... matched as option &#x27;stats&#x27; (print progress report during encoding) with argument &#x27;1&#x27;.&#xA;Reading option &#x27;-hide_banner&#x27; ... matched as option &#x27;hide_banner&#x27; (do not show program banner) with argument &#x27;1&#x27;.&#xA;Reading option &#x27;-use_wallclock_as_timestamps&#x27; ... matched as AVOption &#x27;use_wallclock_as_timestamps&#x27; with argument &#x27;1&#x27;.&#xA;Reading option &#x27;-rtsp_transport&#x27; ... matched as AVOption &#x27;rtsp_transport&#x27; with argument &#x27;tcp&#x27;.&#xA;Reading option &#x27;-i&#x27; ... matched as input url with argument &#x27;rtsp://user:password1@192.168.5.21/cam/realmonitor?channel=1channel1[1]=1subtype=0&#x27;.&#xA;Reading option &#x27;-c:v&#x27; ... matched as option &#x27;c&#x27; (codec name) with argument &#x27;copy&#x27;.&#xA;Reading option &#x27;-c:a&#x27; ... matched as option &#x27;c&#x27; (codec name) with argument &#x27;aac&#x27;.&#xA;Reading option &#x27;-copyts&#x27; ... matched as option &#x27;copyts&#x27; (copy timestamps) with argument &#x27;1&#x27;.&#xA;Reading option &#x27;-f&#x27; ... matched as option &#x27;f&#x27; (force format) with argument &#x27;matroska&#x27;.&#xA;Reading option &#x27;-y&#x27; ... matched as option &#x27;y&#x27; (overwrite output files) with argument &#x27;1&#x27;.&#xA;Reading option &#x27;rec.mkv&#x27; ... matched as output url.&#xA;Finished splitting the commandline.&#xA;Parsing a group of options: global .&#xA;Applying option report (generate a report) with argument 1.&#xA;Applying option stats (print progress report during encoding) with argument 1.&#xA;Applying option hide_banner (do not show program banner) with argument 1.&#xA;Applying option copyts (copy timestamps) with argument 1.&#xA;Applying option y (overwrite output files) with argument 1.&#xA;Successfully parsed a group of options.&#xA;Parsing a group of options: input url rtsp://user:password1@192.168.5.21/cam/realmonitor?channel=1channel1[1]=1subtype=0.&#xA;Successfully parsed a group of options.&#xA;Opening an input file: rtsp://user:password1@192.168.5.21/cam/realmonitor?channel=1channel1[1]=1subtype=0.&#xA;[tcp @ 0x1646660] No default whitelist set&#xA;[tcp @ 0x1646660] Original list of addresses:&#xA;[tcp @ 0x1646660] Address 192.168.5.21 port 554&#xA;[tcp @ 0x1646660] Interleaved list of addresses:&#xA;[tcp @ 0x1646660] Address 192.168.5.21 port 554&#xA;[tcp @ 0x1646660] Starting connection attempt to 192.168.5.21 port 554&#xA;[tcp @ 0x1646660] Successfully connected to 192.168.5.21 port 554&#xA;[rtsp @ 0x1645e70] SDP:&#xA;v=0&#xA;o=- 2251950012 2251950012 IN IP4 0.0.0.0&#xA;s=Media Server&#xA;c=IN IP4 0.0.0.0&#xA;t=0 0&#xA;a=control:*&#xA;a=packetization-supported:DH&#xA;a=rtppayload-supported:DH&#xA;a=range:npt=now-&#xA;a=x-packetization-supported:IV&#xA;a=x-rtppayload-supported:IV&#xA;m=video 0 RTP/AVP 96&#xA;a=control:trackID=0&#xA;a=framerate:25.000000&#xA;a=rtpmap:96 H264/90000&#xA;a=fmtp:96 packetization-mode=1;profile-level-id=4D4028;sprop-parameter-sets=Z01AKKaAeAIn5ZuAgICgAAADACAAAAZQgAA=,aO48gAA=&#xA;a=recvonly&#xA;m=audio 0 RTP/AVP 97&#xA;a=control:trackID=1&#xA;a=rtpmap:97 MPEG4-GENERIC/16000&#xA;a=fmtp:97 streamtype=5;profile-level-id=1;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3;config=1408&#xA;a=recvonly&#xA;&#xA;[rtsp @ 0x1645e70] video codec set to: h264&#xA;[rtsp @ 0x1645e70] RTP Packetization Mode: 1&#xA;[rtsp @ 0x1645e70] RTP Profile IDC: 4d Profile IOP: 40 Level: 28&#xA;[rtsp @ 0x1645e70] Extradata set to 0x164af98 (size: 39)&#xA;[rtsp @ 0x1645e70] audio codec set to: aac&#xA;[rtsp @ 0x1645e70] audio samplerate set to: 16000&#xA;[rtsp @ 0x1645e70] audio channels set to: 1&#xA;[rtsp @ 0x1645e70] setting jitter buffer size to 0&#xA;[rtsp @ 0x1645e70] setting jitter buffer size to 0&#xA;[rtsp @ 0x1645e70] hello state=0&#xA;Failed to parse interval end specification &#x27;&#x27;&#xA;[h264 @ 0x164ab30] nal_unit_type: 7(SPS), nal_ref_idc: 3&#xA;[h264 @ 0x164ab30] nal_unit_type: 8(PPS), nal_ref_idc: 3&#xA;[h264 @ 0x164ab30] nal_unit_type: 7(SPS), nal_ref_idc: 3&#xA;[h264 @ 0x164ab30] nal_unit_type: 8(PPS), nal_ref_idc: 3&#xA;[h264 @ 0x164ab30] nal_unit_type: 7(SPS), nal_ref_idc: 3&#xA;[h264 @ 0x164ab30] nal_unit_type: 8(PPS), nal_ref_idc: 3&#xA;[h264 @ 0x164ab30] nal_unit_type: 5(IDR), nal_ref_idc: 3&#xA;[h264 @ 0x164ab30] Format yuvj420p chosen by get_format().&#xA;[h264 @ 0x164ab30] Reinit context to 1920x1088, pix_fmt: yuvj420p&#xA;[h264 @ 0x164ab30] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3&#xA;[h264 @ 0x164ab30] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3&#xA;[h264 @ 0x164ab30] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3&#xA;[h264 @ 0x164ab30] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3&#xA;[h264 @ 0x164ab30] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3&#xA;[h264 @ 0x164ab30] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3&#xA;[rtsp @ 0x1645e70] All info found&#xA;Input #0, rtsp, from &#x27;rtsp://user:password1@192.168.5.21/cam/realmonitor?channel=1channel1[1]=1subtype=0&#x27;:&#xA;  Metadata:&#xA;    title           : Media Server&#xA;  Duration: N/A, start: 1713164678.794625, bitrate: N/A&#xA;    Stream #0:0, 22, 1/90000: Video: h264 (Main), yuvj420p(pc, bt709, progressive), 1920x1080, 25 fps, 25 tbr, 90k tbn, 50 tbc&#xA;    Stream #0:1, 15, 1/16000: Audio: aac (LC), 16000 Hz, mono, fltp&#xA;Successfully opened the file.&#xA;Parsing a group of options: output url rec.mkv.&#xA;Applying option c:v (codec name) with argument copy.&#xA;Applying option c:a (codec name) with argument aac.&#xA;Applying option f (force format) with argument matroska.&#xA;Successfully parsed a group of options.&#xA;Opening an output file: rec.mkv.&#xA;[file @ 0x1699f30] Setting default whitelist &#x27;file,crypto,data&#x27;&#xA;Successfully opened the file.&#xA;Stream mapping:&#xA;  Stream #0:0 -> #0:0 (copy)&#xA;  Stream #0:1 -> #0:1 (aac (native) -> aac (native))&#xA;Press [q] to stop, [?] for help&#xA;cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)&#xA;cur_dts is invalid st:1 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)&#xA;detected 4 logical cores&#xA;[graph_0_in_0_1 @ 0x1682bb0] Setting &#x27;time_base&#x27; to value &#x27;1/16000&#x27;&#xA;[graph_0_in_0_1 @ 0x1682bb0] Setting &#x27;sample_rate&#x27; to value &#x27;16000&#x27;&#xA;[graph_0_in_0_1 @ 0x1682bb0] Setting &#x27;sample_fmt&#x27; to value &#x27;fltp&#x27;&#xA;[graph_0_in_0_1 @ 0x1682bb0] Setting &#x27;channel_layout&#x27; to value &#x27;0x4&#x27;&#xA;[graph_0_in_0_1 @ 0x1682bb0] tb:1/16000 samplefmt:fltp samplerate:16000 chlayout:0x4&#xA;[format_out_0_1 @ 0x187f2e0] Setting &#x27;sample_fmts&#x27; to value &#x27;fltp&#x27;&#xA;[format_out_0_1 @ 0x187f2e0] Setting &#x27;sample_rates&#x27; to value &#x27;96000|88200|64000|48000|44100|32000|24000|22050|16000|12000|11025|8000|7350&#x27;&#xA;[AVFilterGraph @ 0x164fd70] query_formats: 4 queried, 9 merged, 0 already done, 0 delayed&#xA;[matroska @ 0x169c330] get_metadata_duration returned: 0&#xA;Output #0, matroska, to &#x27;rec.mkv&#x27;:&#xA;  Metadata:&#xA;    title           : Media Server&#xA;    encoder         : Lavf58.45.100&#xA;    Stream #0:0, 0, 1/1000: Video: h264 (Main) (H264 / 0x34363248), yuvj420p(pc, bt709, progressive), 1920x1080, q=2-31, 25 fps, 25 tbr, 1k tbn, 90k tbc&#xA;    Stream #0:1, 0, 1/1000: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 16000 Hz, mono, fltp, 69 kb/s&#xA;    Metadata:&#xA;      encoder         : Lavc58.91.100 aac&#xA;cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)&#xA;cur_dts is invalid st:1 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)&#xA;cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)&#xA;[matroska @ 0x169c330] Starting new cluster with timestamp 1713164678731 at offset 770 bytes&#xA;[matroska @ 0x169c330] Writing block of size 581 with pts 1713164678731, dts 1713164678731, duration 64 at relative offset 14 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 517 with pts 1713164678795, dts 1713164678795, duration 64 at relative offset 602 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 376900 with pts 1713164678872, dts 1713164678872, duration 40 at relative offset 1126 in cluster at offset 770. TrackNumber 1, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 8172 with pts 1713164678912, dts 1713164678912, duration 40 at relative offset 378034 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 672 with pts 1713164678912, dts 1713164678912, duration 64 at relative offset 386213 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 550 with pts 1713164679177, dts 1713164679177, duration 64 at relative offset 386892 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 7654 with pts 1713164679178, dts 1713164679178, duration 40 at relative offset 387449 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 7483 with pts 1713164679213, dts 1713164679213, duration 40 at relative offset 395110 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 7703 with pts 1713164679242, dts 1713164679242, duration 40 at relative offset 402600 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 565 with pts 1713164679242, dts 1713164679242, duration 64 at relative offset 410310 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 7650 with pts 1713164679271, dts 1713164679271, duration 40 at relative offset 410882 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 585 with pts 1713164679271, dts 1713164679271, duration 64 at relative offset 418539 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 8682 with pts 1713164679301, dts 1713164679301, duration 40 at relative offset 419131 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 8888 with pts 1713164679330, dts 1713164679330, duration 40 at relative offset 427820 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 506 with pts 1713164679330, dts 1713164679330, duration 64 at relative offset 436715 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 8019 with pts 1713164679360, dts 1713164679360, duration 40 at relative offset 437228 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 7919 with pts 1713164679361, dts 1713164679361, duration 40 at relative offset 445254 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 7822 with pts 1713164679361, dts 1713164679361, duration 40 at relative offset 453180 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 699 with pts 1713164679361, dts 1713164679361, duration 64 at relative offset 461009 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 619 with pts 1713164679361, dts 1713164679361, duration 64 at relative offset 461715 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 7768 with pts 1713164679362, dts 1713164679362, duration 40 at relative offset 462341 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 8469 with pts 1713164679362, dts 1713164679362, duration 40 at relative offset 470116 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 601 with pts 1713164679362, dts 1713164679362, duration 64 at relative offset 478592 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 559 with pts 1713164679363, dts 1713164679363, duration 64 at relative offset 479200 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 8265 with pts 1713164679366, dts 1713164679366, duration 40 at relative offset 479766 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 7766 with pts 1713164679406, dts 1713164679406, duration 40 at relative offset 488038 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 531 with pts 1713164679415, dts 1713164679415, duration 64 at relative offset 495811 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 7753 with pts 1713164679446, dts 1713164679446, duration 40 at relative offset 496349 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 8274 with pts 1713164679486, dts 1713164679486, duration 40 at relative offset 504109 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 569 with pts 1713164679496, dts 1713164679496, duration 64 at relative offset 512390 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 8445 with pts 1713164679526, dts 1713164679526, duration 40 at relative offset 512966 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 522 with pts 1713164679535, dts 1713164679535, duration 64 at relative offset 521418 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 7922 with pts 1713164679566, dts 1713164679566, duration 40 at relative offset 521947 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 7954 with pts 1713164679606, dts 1713164679606, duration 40 at relative offset 529876 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 503 with pts 1713164679615, dts 1713164679615, duration 64 at relative offset 537837 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 11167 with pts 1713164679646, dts 1713164679646, duration 40 at relative offset 538347 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 503 with pts 1713164679655, dts 1713164679655, duration 64 at relative offset 549521 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 10534 with pts 1713164679686, dts 1713164679686, duration 40 at relative offset 550031 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 7607 with pts 1713164679726, dts 1713164679726, duration 40 at relative offset 560572 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 478 with pts 1713164679772, dts 1713164679772, duration 64 at relative offset 568186 in cluster at offset 770. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 7842 with pts 1713164679774, dts 1713164679774, duration 40 at relative offset 568671 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 9862 with pts 1713164679806, dts 1713164679806, duration 40 at relative offset 576520 in cluster at offset 770. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Starting new cluster with timestamp 1713164679815 at offset 587166 bytes&#xA;[matroska @ 0x169c330] Writing block of size 449 with pts 1713164679815, dts 1713164679815, duration 64 at relative offset 14 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 379456 with pts 1713164679870, dts 1713164679870, duration 40 at relative offset 470 in cluster at offset 587166. TrackNumber 1, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 415 with pts 1713164679903, dts 1713164679903, duration 64 at relative offset 379934 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 7008 with pts 1713164679905, dts 1713164679905, duration 40 at relative offset 380356 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 6917 with pts 1713164679925, dts 1713164679925, duration 40 at relative offset 387371 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 513 with pts 1713164679935, dts 1713164679935, duration 64 at relative offset 394295 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 7111 with pts 1713164679966, dts 1713164679966, duration 40 at relative offset 394815 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 753 with pts 1713164679975, dts 1713164679975, duration 64 at relative offset 401933 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 7091 with pts 1713164680006, dts 1713164680006, duration 40 at relative offset 402693 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 7045 with pts 1713164680045, dts 1713164680045, duration 40 at relative offset 409791 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 659 with pts 1713164680055, dts 1713164680055, duration 64 at relative offset 416843 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 6983 with pts 1713164680086, dts 1713164680086, duration 40 at relative offset 417509 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 6932 with pts 1713164680127, dts 1713164680127, duration 40 at relative offset 424499 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;frame=   35 fps=0.0 q=-1.0 size=     512kB time=475879:04:40.20 bitrate=   0.0kbits/s speed=3.35e&#x2B;09x    &#xA;[matroska @ 0x169c330] Writing block of size 691 with pts 1713164680135, dts 1713164680135, duration 64 at relative offset 431438 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 6990 with pts 1713164680166, dts 1713164680166, duration 40 at relative offset 432136 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 651 with pts 1713164680176, dts 1713164680176, duration 64 at relative offset 439133 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 7046 with pts 1713164680206, dts 1713164680206, duration 40 at relative offset 439791 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 7130 with pts 1713164680246, dts 1713164680246, duration 40 at relative offset 446844 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 601 with pts 1713164680255, dts 1713164680255, duration 64 at relative offset 453981 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 7205 with pts 1713164680286, dts 1713164680286, duration 40 at relative offset 454589 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 561 with pts 1713164680295, dts 1713164680295, duration 64 at relative offset 461801 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 6936 with pts 1713164680326, dts 1713164680326, duration 40 at relative offset 462369 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 6822 with pts 1713164680366, dts 1713164680366, duration 40 at relative offset 469312 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 621 with pts 1713164680375, dts 1713164680375, duration 64 at relative offset 476141 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 6845 with pts 1713164680405, dts 1713164680405, duration 40 at relative offset 476769 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 6848 with pts 1713164680445, dts 1713164680445, duration 40 at relative offset 483621 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 588 with pts 1713164680455, dts 1713164680455, duration 64 at relative offset 490476 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 6828 with pts 1713164680486, dts 1713164680486, duration 40 at relative offset 491071 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 546 with pts 1713164680495, dts 1713164680495, duration 64 at relative offset 497906 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 6845 with pts 1713164680526, dts 1713164680526, duration 40 at relative offset 498459 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 6924 with pts 1713164680566, dts 1713164680566, duration 40 at relative offset 505311 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 508 with pts 1713164680576, dts 1713164680576, duration 64 at relative offset 512242 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 6844 with pts 1713164680606, dts 1713164680606, duration 40 at relative offset 512757 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;frame=   48 fps= 47 q=-1.0 size=     512kB time=475879:04:40.72 bitrate=   0.0kbits/s speed=1.66e&#x2B;09x    &#xA;[matroska @ 0x169c330] Writing block of size 587 with pts 1713164680615, dts 1713164680615, duration 64 at relative offset 519608 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 6859 with pts 1713164680645, dts 1713164680645, duration 40 at relative offset 520202 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 6855 with pts 1713164680686, dts 1713164680686, duration 40 at relative offset 527068 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 573 with pts 1713164680695, dts 1713164680695, duration 64 at relative offset 533930 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 6881 with pts 1713164680726, dts 1713164680726, duration 40 at relative offset 534510 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 10773 with pts 1713164680766, dts 1713164680766, duration 40 at relative offset 541398 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 520 with pts 1713164680775, dts 1713164680775, duration 64 at relative offset 552178 in cluster at offset 587166. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 6923 with pts 1713164680805, dts 1713164680805, duration 40 at relative offset 552705 in cluster at offset 587166. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Starting new cluster with timestamp 1713164680815 at offset 1146808 bytes&#xA;[matroska @ 0x169c330] Writing block of size 580 with pts 1713164680815, dts 1713164680815, duration 64 at relative offset 14 in cluster at offset 1146808. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 380085 with pts 1713164680864, dts 1713164680864, duration 40 at relative offset 601 in cluster at offset 1146808. TrackNumber 1, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 9916 with pts 1713164680896, dts 1713164680896, duration 40 at relative offset 380694 in cluster at offset 1146808. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 541 with pts 1713164680901, dts 1713164680901, duration 64 at relative offset 390617 in cluster at offset 1146808. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 5877 with pts 1713164680925, dts 1713164680925, duration 40 at relative offset 391165 in cluster at offset 1146808. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] Writing block of size 529 with pts 1713164680935, dts 1713164680935, duration 64 at relative offset 397049 in cluster at offset 1146808. TrackNumber 2, keyframe 1&#xA;[matroska @ 0x169c330] Writing block of size 6661 with pts 1713164680966, dts 1713164680966, duration 40 at relative offset 397585 in cluster at offset 1146808. TrackNumber 1, keyframe 0&#xA;[matroska @ 0x169c330] end duration = 1713164681006&#xA;[matroska @ 0x169c330] stream 0 end duration = 1713164681006&#xA;[matroska @ 0x169c330] stream 1 end duration = 1713164680999&#xA;frame=   54 fps= 42 q=-1.0 Lsize=    1515kB time=475879:04:40.99 bitrate=   0.0kbits/s speed=1.33e&#x2B;09x    &#xA;video:1493kB audio:20kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.099897%&#xA;Input file #0 (rtsp://user:password1@192.168.5.21/cam/realmonitor?channel=1channel1[1]=1subtype=0):&#xA;  Input stream #0:0 (video): 54 packets read (1529156 bytes); &#xA;  Input stream #0:1 (audio): 35 packets read (9268 bytes); 35 frames decoded (35840 samples); &#xA;  Total: 89 packets (1538424 bytes) demuxed&#xA;Output file #0 (rec.mkv):&#xA;  Output stream #0:0 (video): 54 packets muxed (1529156 bytes); &#xA;  Output stream #0:1 (audio): 35 frames encoded (35840 samples); 36 packets muxed (20446 bytes); &#xA;  Total: 90 packets (1549602 bytes) muxed&#xA;35 frames successfully decoded, 0 decoding errors&#xA;[AVIOContext @ 0x1667620] Statistics: 2 seeks, 7 writeouts&#xA;[aac @ 0x1673880] Qavg: 142.738&#xA;Exiting normally, received signal 15.&#xA;

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    In this short 3 second capture the duplicate timestamps are 1713164679.361000 and 1713164679.362000.

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    How can I solve this problem ? What different approach could I use to achieve this goal ?

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    Thanks in advance.

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