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• Extracting mp3 from mp4 via FFMPEG doesn't apply audio bitrate

  17 juillet 2021, par Mohammad Zamanian

  I want to extract a simplified mono low bitrate low frequency and basically low sized audio from any mp4 file. I use the following FFMPEG command but the resulting audio somehow has 2 channels and its bitrate is the same as the original audio from mp4.

  


  ffmpeg.exe -report -y -i "{mp4}" -vn -acodec libmp3lame -ac 1 -ab 64k -ar 24000 -f mp3 output "{mp3}"


  


  Here is my report :

  


  ffmpeg started on 2021-07-17 at 18:30:20
Report written to "ffmpeg-20210717-183020.log"
Log level: 48
Command line:
"C:\\ffmpeg\\bin\\ffmpeg.exe" -report -y -i "C:/Users/ScottRobertson/Desktop/VirtualExhibition/Final Booth Data/1-Abidi (gold)/Video/Video1.mp4" -vn -acodec libmp3lame -ac 1 -ab 64k -f mp3 output "C:/Users/ScottRobertson/Desktop/VirtualExhibition/Final Booth Data/1-Abidi (gold)/Video/Audio.mp3"
ffmpeg version 4.3.1-2021-01-01-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (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-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --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-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-l  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Splitting the commandline.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Reading option '-i' ... matched as input url with argument 'C:/Users/ScottRobertson/Desktop/VirtualExhibition/Final Booth Data/1-Abidi (gold)/Video/Video1.mp4'.
Reading option '-vn' ... matched as option 'vn' (disable video) with argument '1'.
Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'libmp3lame'.
Reading option '-ac' ... matched as option 'ac' (set number of audio channels) with argument '1'.
Reading option '-ab' ... matched as option 'ab' (audio bitrate (please use -b:a)) with argument '64k'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'mp3'.
Reading option 'output' ... matched as output url.
Reading option 'C:/Users/ScottRobertson/Desktop/VirtualExhibition/Final Booth Data/1-Abidi (gold)/Video/Audio.mp3' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Applying option y (overwrite output files) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url C:/Users/ScottRobertson/Desktop/VirtualExhibition/Final Booth Data/1-Abidi (gold)/Video/Video1.mp4.
Successfully parsed a group of options.
Opening an input file: C:/Users/ScottRobertson/Desktop/VirtualExhibition/Final Booth Data/1-Abidi (gold)/Video/Video1.mp4.
[NULL @ 000002e7d956ed40] Opening 'C:/Users/ScottRobertson/Desktop/VirtualExhibition/Final Booth Data/1-Abidi (gold)/Video/Video1.mp4' for reading
[file @ 000002e7d956fd80] Setting default whitelist 'file,crypto,data'
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002e7d956ed40] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002e7d956ed40] ISO: File Type Major Brand: mp42
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002e7d956ed40] Unknown dref type 0x206c7275 size 12
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002e7d956ed40] Setting codecpar->delay to 1 for stream st: 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002e7d956ed40] Unknown dref type 0x206c7275 size 12
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002e7d956ed40] Before avformat_find_stream_info() pos: 139797 bytes read:65536 seeks:1 nb_streams:2
[h264 @ 000002e7d9570c00] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 000002e7d9570c00] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 000002e7d9570c00] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 000002e7d9570c00] Format yuv420p chosen by get_format().
[h264 @ 000002e7d9570c00] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 000002e7d9570c00] no picture 
[h264 @ 000002e7d9570c00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
[h264 @ 000002e7d9570c00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[h264 @ 000002e7d9570c00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[h264 @ 000002e7d9570c00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[h264 @ 000002e7d9570c00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
[h264 @ 000002e7d9570c00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[h264 @ 000002e7d9570c00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002e7d956ed40] All info found
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002e7d956ed40] After avformat_find_stream_info() pos: 158020 bytes read:65536 seeks:1 frames:11
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:/Users/ScottRobertson/Desktop/VirtualExhibition/Final Booth Data/1-Abidi (gold)/Video/Video1.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2020-11-24T06:56:49.000000Z
  Duration: 00:00:56.45, start: 0.000000, bitrate: 893 kb/s
    Stream #0:0(eng), 10, 1/30000: Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 749 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      creation_time   : 2020-11-24T06:56:49.000000Z
      handler_name    : Mainconcept Video Media Handler
      encoder         : AVC Coding
    Stream #0:1(eng), 1, 1/44100: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      creation_time   : 2020-11-24T06:56:49.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
Successfully opened the file.
Parsing a group of options: output url output.
Applying option vn (disable video) with argument 1.
Applying option acodec (force audio codec ('copy' to copy stream)) with argument libmp3lame.
Applying option ac (set number of audio channels) with argument 1.
Applying option ab (audio bitrate (please use -b:a)) with argument 64k.
Applying option f (force format) with argument mp3.
Successfully parsed a group of options.
Opening an output file: output.
[file @ 000002e7d958e340] Setting default whitelist 'file,crypto,data'
Successfully opened the file.
Parsing a group of options: output url C:/Users/ScottRobertson/Desktop/VirtualExhibition/Final Booth Data/1-Abidi (gold)/Video/Audio.mp3.
Successfully parsed a group of options.
Opening an output file: C:/Users/ScottRobertson/Desktop/VirtualExhibition/Final Booth Data/1-Abidi (gold)/Video/Audio.mp3.
[file @ 000002e7da1bc480] Setting default whitelist 'file,crypto,data'
Successfully opened the file.
Stream mapping:
  Stream #0:1 -> #0:0 (aac (native) -> mp3 (libmp3lame))
  Stream #0:1 -> #1:0 (aac (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
detected 8 logical cores
[graph_0_in_0_1 @ 000002e7dac2b7c0] Setting 'time_base' to value '1/44100'
[graph_0_in_0_1 @ 000002e7dac2b7c0] Setting 'sample_rate' to value '44100'
[graph_0_in_0_1 @ 000002e7dac2b7c0] Setting 'sample_fmt' to value 'fltp'
[graph_0_in_0_1 @ 000002e7dac2b7c0] Setting 'channel_layout' to value '0x3'
[graph_0_in_0_1 @ 000002e7dac2b7c0] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x3
[format_out_0_0 @ 000002e7dac2b8c0] Setting 'sample_fmts' to value 's32p|fltp|s16p'
[format_out_0_0 @ 000002e7dac2b8c0] Setting 'sample_rates' to value '44100|48000|32000|22050|24000|16000|11025|12000|8000'
[format_out_0_0 @ 000002e7dac2b8c0] Setting 'channel_layouts' to value '0x4'
[format_out_0_0 @ 000002e7dac2b8c0] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_0'
[AVFilterGraph @ 000002e7da1bdfc0] query_formats: 4 queried, 7 merged, 3 already done, 0 delayed
[auto_resampler_0 @ 000002e7d958edc0] [SWR @ 000002e7d95fd240] Using fltp internally between filters
[auto_resampler_0 @ 000002e7d958edc0] [SWR @ 000002e7d95fd240] Matrix coefficients:
[auto_resampler_0 @ 000002e7d958edc0] [SWR @ 000002e7d95fd240] FC: FL:0.707107 FR:0.707107 
[auto_resampler_0 @ 000002e7d958edc0] ch:2 chl:stereo fmt:fltp r:44100Hz -> ch:1 chl:mono fmt:fltp r:44100Hz
Output #0, mp3, to 'output':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    TSSE            : Lavf58.45.100
    Stream #0:0(eng), 0, 1/44100: Audio: mp3 (libmp3lame), 44100 Hz, mono, fltp, 64 kb/s (default)
    Metadata:
      creation_time   : 2020-11-24T06:56:49.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
      encoder         : Lavc58.91.100 libmp3lame
[graph_1_in_0_1 @ 000002e7d9a5bf00] Setting 'time_base' to value '1/44100'
[graph_1_in_0_1 @ 000002e7d9a5bf00] Setting 'sample_rate' to value '44100'
[graph_1_in_0_1 @ 000002e7d9a5bf00] Setting 'sample_fmt' to value 'fltp'
[graph_1_in_0_1 @ 000002e7d9a5bf00] Setting 'channel_layout' to value '0x3'
[graph_1_in_0_1 @ 000002e7d9a5bf00] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x3
[format_out_1_0 @ 000002e7da1b8580] Setting 'sample_fmts' to value 's32p|fltp|s16p'
[format_out_1_0 @ 000002e7da1b8580] Setting 'sample_rates' to value '44100|48000|32000|22050|24000|16000|11025|12000|8000'
[format_out_1_0 @ 000002e7da1b8580] Setting 'channel_layouts' to value '0x4|0x3'
[AVFilterGraph @ 000002e7da1be5c0] query_formats: 4 queried, 9 merged, 0 already done, 0 delayed
Output #1, mp3, to 'C:/Users/ScottRobertson/Desktop/VirtualExhibition/Final Booth Data/1-Abidi (gold)/Video/Audio.mp3':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    TSSE            : Lavf58.45.100
    Stream #1:0(eng), 0, 1/44100: Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp (default)
    Metadata:
      creation_time   : 2020-11-24T06:56:49.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
      encoder         : Lavc58.91.100 libmp3lame
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)
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)
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)
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)
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)
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)
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)
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)
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)
size=     129kB time=00:00:16.40 bitrate=  64.2kbits/s speed=32.8x    
size=     254kB time=00:00:32.49 bitrate=  64.1kbits/s speed=32.5x    
size=     256kB time=00:00:47.83 bitrate=  43.8kbits/s speed=31.8x    
[out_0_0 @ 000002e7d95b3d40] EOF on sink link out_0_0:default.
[out_1_0 @ 000002e7d9bae780] EOF on sink link out_1_0:default.
No more output streams to write to, finishing.
[libmp3lame @ 000002e7d958dbc0] Trying to remove 175 more samples than there are in the queue
[libmp3lame @ 000002e7da1bb940] Trying to remove 175 more samples than there are in the queue
size=     442kB time=00:00:56.45 bitrate=  64.1kbits/s speed=  33x    
video:0kB audio:1324kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Input file #0 (C:/Users/ScottRobertson/Desktop/VirtualExhibition/Final Booth Data/1-Abidi (gold)/Video/Video1.mp4):
  Input stream #0:0 (video): 10 packets read (17858 bytes); 
  Input stream #0:1 (audio): 2431 packets read (886147 bytes); 2431 frames decoded (2489344 samples); 
  Total: 2441 packets (904005 bytes) demuxed
Output file #0 (output):
  Output stream #0:0 (audio): 2161 frames encoded (2489344 samples); 2162 packets muxed (451813 bytes); 
  Total: 2162 packets (451813 bytes) muxed
Output file #1 (C:/Users/ScottRobertson/Desktop/VirtualExhibition/Final Booth Data/1-Abidi (gold)/Video/Audio.mp3):
  Output stream #1:0 (audio): 2161 frames encoded (2489344 samples); 2162 packets muxed (903627 bytes); 
  Total: 2162 packets (903627 bytes) muxed
2431 frames successfully decoded, 0 decoding errors
[AVIOContext @ 000002e7d958e400] Statistics: 2 seeks, 3 writeouts
[AVIOContext @ 000002e7da1bc580] Statistics: 2 seeks, 5 writeouts
[AVIOContext @ 000002e7d9578040] Statistics: 2725576 bytes read, 65 seeks


  


  How can I force the desired audio bitrate ?

  


  Also, why is there 2 outputs called Output file #0 and Output file #1 and why the #0 doesn't have any path ?

  


• FFMpeg produces low quality target file with just 1 second length on Ubuntu 20.04

  16 juillet 2021, par Matt

  I'm using FFMpeg locally on a Mac (actually using PHP-FFMpeg) and it's working perfectly. I'm running the same code on an Ubuntu server and whatever I try the output file is a tiny, low quality video with just 1 second length (the original is about 15 seconds).

  


  I installed it on the server with

  


  sudo apt update
sudo apt install ffmpeg


  


  and then restarted the server. To test now I'm running

  


  ffmpeg -i source.mp4 target.mp4


  


  from the terminal and getting this output

  


  ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'source.mp4':
  Metadata:
    major_brand     : iso5
    minor_version   : 1
    compatible_brands: isomiso5hlsf
    creation_time   : 2021-07-16T05:37:58.000000Z
  Duration: 00:00:00.66, start: 0.000000, bitrate: 74037 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 640x480 [SAR 1:1 DAR 4:3], 83522 kb/s, 30.20 fps, 600 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      creation_time   : 2021-07-16T05:37:58.000000Z
      handler_name    : Core Media Video
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 1774 kb/s (default)
    Metadata:
      creation_time   : 2021-07-16T05:37:58.000000Z
      handler_name    : Core Media Audio
File 'target.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x55db778748c0] using SAR=1/1
[libx264 @ 0x55db778748c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x55db778748c0] profile High, level 3.0
[libx264 @ 0x55db778748c0] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
frame=    8 fps=0.0 q=0.0 size=       0kB time=-577014:32:22.77 bitrate=  -0.0kbOutput #0, mp4, to 'target.mp4':
  Metadata:
    major_brand     : iso5
    minor_version   : 1
    compatible_brands: isomiso5hlsf
    encoder         : Lavf58.29.100
    Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 30.20 fps, 28k tbn, 30.20 tbc (default)
    Metadata:
      creation_time   : 2021-07-16T05:37:58.000000Z
      handler_name    : Core Media Video
      encoder         : Lavc58.54.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s (default)
    Metadata:
      creation_time   : 2021-07-16T05:37:58.000000Z
      handler_name    : Core Media Audio
      encoder         : Lavc58.54.100 aac
frame=   15 fps= 14 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=3 droframe=   18 fps= 11 q=0.0 size=       0kB time=00:00:00.46 bitrate=   0.8kbits/sframe=   18 fps=7.9 q=0.0 size=       0kB time=00:00:00.46 bitrate=   0.8kbits/sframe=   18 fps=6.4 q=0.0 size=       0kB time=00:00:00.46 bitrate=   0.8kbits/sframe=   19 fps=5.8 q=0.0 size=       0kB time=00:00:00.46 bitrate=   0.8kbits/sframe=   19 fps=5.0 q=0.0 size=       0kB time=00:00:00.46 bitrate=   0.8kbits/sframe=   20 fps=4.6 q=0.0 size=       0kB time=00:00:00.46 bitrate=   0.8kbits/s[aac @ 0x55db778a2f00] Queue input is backward in time
[mp4 @ 0x55db77876100] Non-monotonous DTS in output stream 0:1; previous: 23552, current: 20480; changing to 23553. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55db77876100] Non-monotonous DTS in output stream 0:1; previous: 23553, current: 21504; changing to 23554. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55db77876100] Non-monotonous DTS in output stream 0:1; previous: 23554, current: 22528; changing to 23555. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55db77876100] Non-monotonous DTS in output stream 0:1; previous: 23555, current: 23552; changing to 23556. This may result in incorrect timestamps in the output file.
frame=   20 fps=3.3 q=-1.0 Lsize=      77kB time=00:00:00.56 bitrate=1122.7kbits/s dup=3 drop=3 speed=0.0936x    
video:69kB audio:6kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.688508%
[libx264 @ 0x55db778748c0] frame I:1     Avg QP:22.13  size: 14863
[libx264 @ 0x55db778748c0] frame P:5     Avg QP:25.37  size:  6279
[libx264 @ 0x55db778748c0] frame B:14    Avg QP:26.80  size:  1720
[libx264 @ 0x55db778748c0] consecutive B-frames:  5.0%  0.0% 15.0% 80.0%
[libx264 @ 0x55db778748c0] mb I  I16..4: 15.9% 65.9% 18.2%
[libx264 @ 0x55db778748c0] mb P  I16..4: 10.6% 11.7%  1.3%  P16..4: 52.4% 11.2%  5.5%  0.0%  0.0%    skip: 7.4%
[libx264 @ 0x55db778748c0] mb B  I16..4:  1.0%  1.3%  0.4%  B16..8: 35.8%  3.0%  0.5%  direct: 2.4%  skip:55.6%  L0:41.2% L1:55.5% BI: 3.3%
[libx264 @ 0x55db778748c0] 8x8 transform intra:56.1% inter:82.3%
[libx264 @ 0x55db778748c0] coded y,uvDC,uvAC intra: 54.1% 75.0% 21.1% inter: 14.6% 25.2% 0.1%
[libx264 @ 0x55db778748c0] i16 v,h,dc,p:  9% 19%  3% 70%
[libx264 @ 0x55db778748c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 18% 24%  5%  6%  9%  6%  6%  6%
[libx264 @ 0x55db778748c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 20% 16%  6%  7%  7%  6%  5%  3%
[libx264 @ 0x55db778748c0] i8c dc,h,v,p: 48% 25% 22%  5%
[libx264 @ 0x55db778748c0] Weighted P-Frames: Y:40.0% UV:40.0%
[libx264 @ 0x55db778748c0] ref P L0: 62.4% 17.4% 14.3%  5.7%  0.1%
[libx264 @ 0x55db778748c0] ref B L0: 87.6% 10.7%  1.7%
[libx264 @ 0x55db778748c0] ref B L1: 95.0%  5.0%
[libx264 @ 0x55db778748c0] kb/s:849.86
[aac @ 0x55db778a2f00] Qavg: 4594.708


  


  Here's what the files look like

  


  

  


  Any ideas what could be wrong ?
Thanks for your help !

  


• ffmpeg can't extract a frame near the end of the video

  29 mars 2024, par Rob Allsopp

  From what I gather, using ffmpeg to fully decode a video should give me an accurate duration. If I use :

  


  ffmpeg -i my_vid.mov -f null -


  


  for a particular video, I get an output of :

  


  ...
frame=  901 fps=0.0 q=-0.0 Lsize=N/A time=00:00:30.52 bitrate=N/A speed= 247x
...


  


  But when I run the following command to extract a frame near the end, it fails :

  


  ffmpeg -i my_vid.mov -ss 00:00:30.450 -q:v 2 -vframes 1 test_frame.jpg


  


  outputs :

  


  Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)


  


  Backing up to 00:00:30.000 with the ffmpeg command does get me a frame, however, and any time before that works as expected also. It seems like I should be able to get frames up to 00:00:30.520, though. What could be wrong here ? Am I misreading the duration output ?

  


  Here is the full output I get from the frame extraction command :

  


  > ffmpeg -ss 00:00:30.450 -i file_example_MOV_640_800kB.mov -q:v 2 -vframes 1 test_frame.jpg

ffmpeg version 2021-04-20-git-718e03e5f2-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, 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      56. 73.100 / 56. 73.100
  libavcodec     58.136.101 / 58.136.101
  libavformat    58. 78.100 / 58. 78.100
  libavdevice    58. 14.100 / 58. 14.100
  libavfilter     7.111.100 /  7.111.100
  libswscale      5. 10.100 /  5. 10.100
  libswresample   3. 10.100 /  3. 10.100
  libpostproc    55. 10.100 / 55. 10.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file_example_MOV_640_800kB.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 512
    compatible_brands: qt
    encoder         : Lavf57.19.100
  Duration: 00:00:30.57, start: 0.000000, bitrate: 208 kb/s
  Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 60 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : FFMP
      encoder         : Lavc57.16.101 libx264
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 139 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[swscaler @ 000001acc1d28580] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'test_frame.jpg':
  Metadata:
    major_brand     : qt
    minor_version   : 512
    compatible_brands: qt
    encoder         : Lavf58.78.100
  Stream #0:0(eng): Video: mjpeg, yuvj420p(pc), 640x360 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 30 fps, 30 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : FFMP
      encoder         : Lavc58.136.101 mjpeg
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
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)


  


  Here's the full output with copyts :

  


  > ffmpeg -copyts -sseof -3 -i file_example_MOV_640_800kB.mov -q:v 2 -update 1 test_frame.jpg

ffmpeg version 2021-04-20-git-718e03e5f2-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, 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      56. 73.100 / 56. 73.100
  libavcodec     58.136.101 / 58.136.101
  libavformat    58. 78.100 / 58. 78.100
  libavdevice    58. 14.100 / 58. 14.100
  libavfilter     7.111.100 /  7.111.100
  libswscale      5. 10.100 /  5. 10.100
  libswresample   3. 10.100 /  3. 10.100
  libpostproc    55. 10.100 / 55. 10.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file_example_MOV_640_800kB.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 512
    compatible_brands: qt
    encoder         : Lavf57.19.100
  Duration: 00:00:30.57, start: 0.000000, bitrate: 208 kb/s
  Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 60 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : FFMP
      encoder         : Lavc57.16.101 libx264
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 139 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
File 'test_frame.jpg' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[swscaler @ 0000022d7e964480] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'test_frame.jpg':
  Metadata:
    major_brand     : qt
    minor_version   : 512
    compatible_brands: qt
    encoder         : Lavf58.78.100
  Stream #0:0(eng): Video: mjpeg, yuvj420p(pc, progressive), 640x360 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 30 fps, 30 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : FFMP
      encoder         : Lavc58.136.101 mjpeg
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame=   73 fps=0.0 q=2.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=   0x
video:859kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown