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• Problem using ffmpeg in streaming mode on aac files created by Android

  28 septembre 2018, par Dror Maydan

  I’m recording audio clips in Android using aac, exporting the files to my Mac and then trying to decode them using ffmpeg. It works fine in file mode but fails in streaming mode with the following error. It seems that consistently short files work fine but long files (2 minutes or longer) fail. Bug in Android, ffmpeg or am I using ffmpeg incorrectly ?

  Thanks,
  Dror

  ffmpeg  -f m4a -i -  bad.wav <  3e4cfa9ff60b48d885947291fbfb981b.m4a
  
  
  
  stream 0, offset 0x1916: partial file
  
  pipe:: Invalid data found when processing input

• Silence in RTP stream in ffmpeg

  9 octobre 2020, par Odatia

  I am trying to record a webRTC stream. The stream is coming in in the OPUS codec, and is then being piped into ffmpeg for recording, using the -c:a copy flag. However, if there are missing packets, for example, if I mute my microphone (or even stay quiet for a short period), when the audio is played back (webm file), it jumps across these "silences".

  


  I have tried to use the DTX option to insert comfort noise, but my input is 4800MHz which is not supported.

  


  My full mpeg command is :

  


  ffmpeg -nostdin -protocol_whitelist file,rtp,udp -use_wallclock_as_timestamps 1 -fflags +genpts -i /tmp/sdpfilesfhmw4rymzy8wv25ybm610xte  -map 0:a:0 -c:a copy -f webm -flags +global_header -y ./server/lib/recording/test-icc-networks-xzsyoe1f.webm


  


  Any help would be appreciated !

  


  Thanks,
Joe

  


• ffmpeg conversion results in different number of frames. How to fix corrupted frames ?

  19 mai 2022, par Mike Azatov

  I have used ffmpeg -i original_video.mp4 -vcodec libx265 -crf 28 -vsync 0 -vf scale=800:-1 -preset faster small_video.mp4 for awhile without problem to make a smaller sized video that is completely in sync with the original one.

  


  However, I came across one that after conversion has 44 frames less. My guess is this happens because there are 44 corrupted frames in the original one that gets discarded. If that is the case I would like to either "correct" the original one and then proceed with the conversion the same old way OR/AND convert so the corrupted frames are not skipped but are replaced with the good ones so the videos are still in full sync.

  


  Below is the log from conversion :

  


  ffmpeg -i original_video.ts -vcodec libx265 -crf 28 -vsync 0 -vf scale=800:-1 -preset faster small_video.mp4
ffmpeg version 2021-08-01-git-1f58503013-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.3.0 (Rev5, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      57.  3.100 / 57.  3.100
  libavcodec     59.  3.102 / 59.  3.102
  libavformat    59.  4.101 / 59.  4.101
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  1.103 /  8.  1.103
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
[h264 @ 000001cd26f14d40] mmco: unref short failure
    Last message repeated 1 times
[h264 @ 000001cd26f14d40] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one
[h264 @ 000001cd26f14d40] mmco: unref short failure
    Last message repeated 1 times
[h264 @ 000001cd26f14d40] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one
[h264 @ 000001cd26f14d40] mmco: unref short failure
    Last message repeated 1 times
[h264 @ 000001cd26f14d40] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one
[h264 @ 000001cd26f14d40] Increasing reorder buffer to 2
Input #0, mpegts, from 'original_video.ts':
  Duration: 01:44:24.42, start: 1.560000, bitrate: 10059 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
  Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn
  Stream #0:1[0x101](rus): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 192 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> hevc (libx265))
  Stream #0:1 -> #0:1 (mp2 (native) -> aac (native))
Press [q] to stop, [?] for help
[h264 @ 000001cd28f81bc0] mmco: unref short failure
    Last message repeated 1 times
[h264 @ 000001cd28f81bc0] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one
[h264 @ 000001cd28f82680] mmco: unref short failure
    Last message repeated 1 times
[h264 @ 000001cd28f82680] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one
[h264 @ 000001cd28dab1c0] mmco: unref short failure
    Last message repeated 1 times
[h264 @ 000001cd28dab1c0] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one
x265 [info]: HEVC encoder version 3.5+11-c8905a745
x265 [info]: build info [Windows][GCC 10.3.0][64 bit] 8bit+10bit+12bit
x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
x265 [info]: Main profile, Level-3 (Main tier)
x265 [info]: Thread pool created using 12 threads
x265 [info]: Slices                              : 1
x265 [info]: frame threads / pool features       : 3 / wpp(8 rows)
x265 [warning]: Source height < 720p; disabling lookahead-slices
x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
x265 [info]: ME / range / subpel / merge         : hex / 57 / 2 / 2
x265 [info]: Keyframe min / max / scenecut / bias  : 25 / 250 / 40 / 5.00
x265 [info]: Lookahead / bframes / badapt        : 15 / 4 / 0
x265 [info]: b-pyramid / weightp / weightb       : 1 / 1 / 0
x265 [info]: References / ref-limit  cu / depth  : 2 / on / on
x265 [info]: AQ: mode / str / qg-size / cu-tree  : 2 / 1.0 / 32 / 1
x265 [info]: Rate Control / qCompress            : CRF-28.0 / 0.60
x265 [info]: tools: rd=2 psy-rd=2.00 early-skip rskip mode=1 signhide tmvp
x265 [info]: tools: fast-intra strong-intra-smoothing deblock sao
Output #0, mp4, to 'small_video.mp4':
  Metadata:
    encoder         : Lavf59.4.101
  Stream #0:0: Video: hevc (hev1 / 0x31766568), yuv420p(tv, bt709, top coded first (swapped)), 800x450 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 12800 tbn
    Metadata:
      encoder         : Lavc59.3.102 libx265
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  Stream #0:1(rus): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc59.3.102 aac
[h264 @ 000001cd273dd4c0] mmco: unref short failure53:36.81 bitrate= 770.6kbits/s speed=2.46x
    Last message repeated 1 times
[h264 @ 000001cd273dd4c0] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one
[h264 @ 000001cd26f52400] mmco: unref short failure
    Last message repeated 1 times
[h264 @ 000001cd26f52400] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one
[h264 @ 000001cd26f52400] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one
[mp4 @ 000001cd26fce940] Non-monotonous DTS in output stream 0:0; previous: 62929920, current: 62929920; changing to 62929921. This may result in incorrect timestamps in the output file.
[h264 @ 000001cd28dab1c0] mmco: unref short failure:23:07.54 bitrate= 774.1kbits/s speed= 2.5x
    Last message repeated 1 times
[h264 @ 000001cd28dab1c0] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one
[h264 @ 000001cd26f0e6c0] mmco: unref short failure
    Last message repeated 1 times
[h264 @ 000001cd28f82280] mmco: unref short failure:23:10.63 bitrate= 773.6kbits/s speed= 2.5x
    Last message repeated 1 times
[h264 @ 000001cd28f82280] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one
[h264 @ 000001cd26f52400] mmco: unref short failure
    Last message repeated 1 times
[h264 @ 000001cd26f52000] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one
original_video.ts: corrupt decoded frame in stream 0
    Last message repeated 1 times
[mp4 @ 000001cd26fce940] Non-monotonous DTS in output stream 0:0; previous: 64523776, current: 64523776; changing to 64523777. This may result in incorrect timestamps in the output file.
frame=156566 fps= 68 q=35.9 Lsize=  598731kB time=01:44:24.44 bitrate= 783.0kbits/s speed=2.72x
video:492857kB audio:101295kB subtitle:0kB other streams:0kB global headers:2kB muxing overhead: 0.770682%
x265 [info]: frame I:    688, Avg QP:27.50  kb/s: 4942.18
x265 [info]: frame P:  30767, Avg QP:28.35  kb/s: 2054.94
x265 [info]: frame B: 125111, Avg QP:34.64  kb/s: 273.26
x265 [info]: Weighted P-Frames: Y:7.7% UV:5.6%
x265 [info]: consecutive B-frames: 0.4% 0.1% 0.1% 0.1% 99.3%

encoded 156566 frames in 2300.41s (68.06 fps), 643.89 kb/s, Avg QP:33.37
[aac @ 000001cd27540480] Qavg: 462.740