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• FFMpeg is dropping video track when clipping an mpg video

  16 juin 2017, par M. Grishaber

  I am extracting a clip from an mpg video using the following command.
  ffmpeg.exe -i 271b.mpg -ss 00:00:05.000 -t 00:00:03.200 -c copy out_271b.mpg

  I am using the copy parameter to avoid reencoding the clip.
  The resulting mpg file only has the audio track, no video.
  The following is the FFMpeg screen dump.

  C:\ffmpeg-20170615\bin>ffmpeg.exe -i 271b.mpg -ss 00:00:05.000 -t 00:00:03.200 -c copy out_271b.mpg
  
      ffmpeg version N-86482-gbc40674 Copyright (c) 2000-2017 the FFmpeg developers
  
        built with gcc 7.1.0 (GCC)
  
        configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
        libavutil      55. 66.100 / 55. 66.100
  
        libavcodec     57. 99.100 / 57. 99.100
  
        libavformat    57. 73.100 / 57. 73.100
  
        libavdevice    57.  7.100 / 57.  7.100
  
        libavfilter     6. 92.100 /  6. 92.100
  
        libswscale      4.  7.101 /  4.  7.101
  
        libswresample   2.  8.100 /  2.  8.100
  
        libpostproc    54.  6.100 / 54.  6.100
  
      Input #0, mpeg, from '271b.mpg':
  
        Duration: 00:01:11.44, start: 0.460000, bitrate: 2154 kb/s
  
          Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bt470bg, progressive), 640x480 [SAR 1:1 DAR 4:3], 2000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
          Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, mono, s16p, 128 kb/s
  
      [mpeg @ 0000000000666aa0] VBV buffer size not set, using default size of 130KB
  
      If you want the mpeg file to be compliant to some specification
  
      Like DVD, VCD or others, make sure you set the correct buffer size
  
      Output #0, mpeg, to 'out_271b.mpg':
  
        Metadata:
  
          encoder         : Lavf57.73.100
  
          Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, bt470bg, progressive), 640x480 [SAR 1:1 DAR 4:3], q=2-31, 2000 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
  
          Stream #0:1: Audio: mp2, 44100 Hz, mono, s16p, 128 kb/s
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (copy)
  
        Stream #0:1 -> #0:1 (copy)
  
      Press [q] to stop, [?] for help
  
      frame=   74 fps=0.0 q=-1.0 Lsize=     786kB time=00:00:03.17 bitrate=2027.2kbits/s speed= 198x
  
      video:730kB audio:50kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.843343%

  Thanks

  Addition : I tried to open the generated clip file with ffplay and got the following results. Note that ffplay was able to open and play the original mpg file.

  ffplay.exe out_271b.mpg
  
  ffplay version N-86482-gbc40674 Copyright (c) 2003-2017 the FFmpeg developers
  
    built with gcc 7.1.0 (GCC)
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 66.100 / 55. 66.100
  
    libavcodec     57. 99.100 / 57. 99.100
  
    libavformat    57. 73.100 / 57. 73.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 92.100 /  6. 92.100
  
    libswscale      4.  7.101 /  4.  7.101
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  [mpeg @ 00000000023cde80] probed stream 2 failedB sq=    0B f=0/0
  
  [mpeg @ 00000000023cde80] start time for stream 0 is not set in estimate_timings_from_pts
  
  [mpeg @ 00000000023cde80] Could not find codec parameters for stream 2 (Video: none, none): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, mpeg, from 'out_271bb.mpg':
  
    Duration: 00:00:03.22, start: 0.500000, bitrate: 2068 kb/s
  
      Stream #0:0[0x1bf]: Data: dvd_nav_packet  0KB sq=    0B f=0/0
  
      Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, mono, s16p, 128 kb/s
  
      Stream #0:2[0x1e0]: Video: none, none, 25 fps, 25 tbr, 90k tbn
  
  SDL_OpenAudio (1 channels, 44100 Hz): DirectSoundCreate: No audio device found
  
  No more combinations to try, audio open failed
  
  No codec could be found with id 0
  
  Failed to open file 'out_271b.mpg' or configure filtergraph

• ffmpeg : how to correctly program input framerate calculation, given desired video length duration and output framerate ?

  19 septembre 2015, par user89

  Let us say that I have n pictures named as imgXY.png (where XY represent the numbers 0 to n-1, properly padded with zeros).

  From these, I would like to create a video that is t seconds long, that has an (output) framerate R.

  I want to figure out what the input framerate should be, so I do the following calculation :

  • time spent per frame : t_per_frame = t/n

  • input framerate : 1/t_per_frame = n/t

  However, when I then try to create a movie using the following command :

  ffmpeg -framerate n/t -i img%02d.png -r 30 test_output.mp4

  I don’t get a movie that is t seconds long, and only two of the frames end up getting displayed. Why is this the case ?

  The following questions were unhelpful :

  How to successfully use ffmpeg to convert images into videos

  Turning images into videos with ffmpeg

  I think I am misunderstanding what is meant by input framerate, and what is meant by output framerate. Could you help clarify ? I am using a Python script to call ffmpeg, as documented here : http://zulko.github.io/blog/2013/09/27/read-and-write-video-frames-in-python-using-ffmpeg/

  Here’s the output from the following manually executed command :

  ffmpeg -framerate 24/5 -i img%02d.png -c:v libx264 -r 30 -pix_fmt yuv420p test_output.mp4

  ffmpeg version N-75204-g314bc20 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
  
  enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
  
  ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
  
  le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
  
  able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
  
  ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
  
   --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
  
  e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena
  
  ble-decklink --enable-opencl --enable-zlib
  
    libavutil      55.  2.100 / 55.  2.100
  
    libavcodec     57.  1.100 / 57.  1.100
  
    libavformat    57.  0.100 / 57.  0.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6.  1.100 /  6.  1.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, image2, from 'img%02d.png':
  
    Duration: 00:00:00.42, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, rgb24(pc), 800x400, 4.80 tbr, 4.80 tbn, 4.80 tbc
  
  File 'test_output.mp4' already exists. Overwrite ? [y/N] y
  
  [libx264 @ 0000000004f16ba0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0000000004f16ba0] profile High, level 3.0
  
  [libx264 @ 0000000004f16ba0] 264 - core 148 r2597 e86f3a1 - H.264/MPEG-4 AVC cod
  
  ec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 r
  
  ef=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_pski
  
  p=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 dec
  
  imate=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
  
  Output #0, mp4, to 'test_output.mp4':
  
    Metadata:
  
      encoder         : Lavf57.0.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 800x40
  
  0, q=-1--1, 30 fps, 15360 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.1.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=   12 fps=0.0 q=-1.0 Lsize=       3kB time=00:00:00.33 bitrate=  62.2kbits
  
  /s dup=10 drop=0
  
  video:2kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing ove
  
  rhead: 60.557274%
  
  [libx264 @ 0000000004f16ba0] frame I:1     Avg QP:10.12  size:   566
  
  [libx264 @ 0000000004f16ba0] frame P:3     Avg QP:18.10  size:    62
  
  [libx264 @ 0000000004f16ba0] frame B:8     Avg QP:13.75  size:    22
  
  [libx264 @ 0000000004f16ba0] consecutive B-frames:  8.3%  0.0% 25.0% 66.7%
  
  [libx264 @ 0000000004f16ba0] mb I  I16..4: 99.4%  0.0%  0.6%
  
  [libx264 @ 0000000004f16ba0] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.0%  0.0
  
  %  0.0%  0.0%  0.0%    skip:99.9%
  
  [libx264 @ 0000000004f16ba0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.1%  0.0
  
  %  0.0%  direct: 0.0%  skip:99.9%  L0:37.5% L1:62.5% BI: 0.0%
  
  [libx264 @ 0000000004f16ba0] 8x8 transform intra:0.0% inter:0.0%
  
  [libx264 @ 0000000004f16ba0] coded y,uvDC,uvAC intra: 0.6% 0.0% 0.0% inter: 0.0%
  
   0.0% 0.0%
  
  [libx264 @ 0000000004f16ba0] i16 v,h,dc,p: 96%  0%  4%  0%
  
  [libx264 @ 0000000004f16ba0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 18% 36%  2%  2%
  
   3%  3%  5%  1%
  
  [libx264 @ 0000000004f16ba0] i8c dc,h,v,p: 100%  0%  0%  0%
  
  [libx264 @ 0000000004f16ba0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0000000004f16ba0] ref P L0: 50.0% 50.0%
  
  [libx264 @ 0000000004f16ba0] kb/s:18.50

• FFMPEG - Concatenate 2 MP4 Files, one has video and audio and the other has only audio

  5 août 2016, par Avi

  I am trying to merge 2 mp4 files using FFMPEG. One of these files has both video and audio (track1.mp4), while the other one has only audio (track2.mp4). The names of these files are listed in a text file called 'filesToMerge.txt' in the following manner :

  file 'track1.mp4'
  
  file 'track2.mp4'

  I then execute the following ffmpeg command to merge them.

  ffmpeg -f concat -i filesToMerge.txt -c copy output.mp4

  However, the concatenated file that is generated consists of only the first file that is listed in filesToMerge.txt. That is, if track1.mp4 (which has both video and audio) is the first file in the list, then only that file makes up output.mp4 (the concatenated file produced) and vice versa.

  I would like for both files to be in output.mp4. I am using Ubuntu 14.04 (if that helps). How can I solve this problem ?

  When I run this command
  ffmpeg -i track1.mp4 -i track2.mp4 output.mp4
  I get the following

  ffmpeg version N-76944-g15206ff Copyright (c) 2000-2015 the FFmpeg developers
  
        built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
        configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libdcadec --enable-libfreetype --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
  
        libavutil      55.  9.100 / 55.  9.100
  
        libavcodec     57. 16.101 / 57. 16.101
  
        libavformat    57. 19.100 / 57. 19.100
  
        libavdevice    57.  0.100 / 57.  0.100
  
        libavfilter     6. 17.100 /  6. 17.100
  
        libavresample   3.  0.  0 /  3.  0.  0
  
        libswscale      4.  0.100 /  4.  0.100
  
        libswresample   2.  0.101 /  2.  0.101
  
        libpostproc    54.  0.100 / 54.  0.100
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'track1.mp4':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 512
  
          compatible_brands: isomiso2avc1mp41
  
          encoder         : Lavf56.40.101
  
        Duration: 00:00:10.76, start: 0.023220, bitrate: 351 kb/s
  
          Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 800x400 [SAR 400:533 DAR 800:533], 181 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
          Metadata:
  
            handler_name    : VideoHandler
  
          Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 194 kb/s (default)
  
          Metadata:
  
            handler_name    : SoundHandler
  
      Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'track2.mp4':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 512
  
          compatible_brands: isomiso2mp41
  
          creation_time   : 1970-01-01 00:00:00
  
          encoder         : Lavf52.32.0
  
        Duration: 00:00:32.21, start: 0.000000, bitrate: 46 kb/s
  
          Stream #1:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 43 kb/s (default)
  
          Metadata:
  
            creation_time   : 1970-01-01 00:00:00
  
            handler_name    : SoundHandler
  
      [libx264 @ 0x3950ce0] using SAR=400/533
  
      [libx264 @ 0x3950ce0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
  
      [libx264 @ 0x3950ce0] profile High, level 3.0
  
      [libx264 @ 0x3950ce0] 264 - core 142 r2491 24e4fed - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=1 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
  
      Output #0, mp4, to 'output.mp4':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 512
  
          compatible_brands: isomiso2avc1mp41
  
          encoder         : Lavf57.19.100
  
          Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 800x400 [SAR 400:533 DAR 800:533], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
  
          Metadata:
  
            handler_name    : VideoHandler
  
            encoder         : Lavc57.16.101 libx264
  
          Stream #0:1(und): Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128 kb/s (default)
  
          Metadata:
  
            handler_name    : SoundHandler
  
            encoder         : Lavc57.16.101 libfdk_aac
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
        Stream #0:1 -> #0:1 (aac (native) -> aac (libfdk_aac))
  
      Press [q] to stop, [?] for help
  
      frame=  270 fps= 99 q=28.0 Lsize=     382kB time=00:00:10.72 bitrate= 291.9kbits/s dup=1 drop=0    
  
      video:230kB audio:143kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.482656%
  
      [libx264 @ 0x3950ce0] frame I:2     Avg QP:18.87  size:109452
  
      [libx264 @ 0x3950ce0] frame P:68    Avg QP:15.09  size:   171
  
      [libx264 @ 0x3950ce0] frame B:200   Avg QP:23.33  size:    23
  
      [libx264 @ 0x3950ce0] consecutive B-frames:  1.1%  0.0%  1.1% 97.8%
  
      [libx264 @ 0x3950ce0] mb I  I16..4: 11.0% 39.6% 49.5%
  
      [libx264 @ 0x3950ce0] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  5.9%  0.1%  0.0%  0.0%  0.0%    skip:93.9%
  
      [libx264 @ 0x3950ce0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.3%  0.0%  0.0%  direct: 0.0%  skip:99.7%  L0:21.8% L1:78.2% BI: 0.0%
  
      [libx264 @ 0x3950ce0] 8x8 transform intra:39.7% inter:92.8%
  
      [libx264 @ 0x3950ce0] coded y,uvDC,uvAC intra: 92.0% 95.0% 73.2% inter: 0.1% 1.4% 0.0%
  
      [libx264 @ 0x3950ce0] i16 v,h,dc,p:  1% 30%  4% 66%
  
      [libx264 @ 0x3950ce0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  6% 55% 16%  2%  4%  2%  8%  2%  6%
  
      [libx264 @ 0x3950ce0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 18% 13%  7%  9%  7% 12%  6% 11%
  
      [libx264 @ 0x3950ce0] i8c dc,h,v,p: 44% 35% 10% 11%
  
      [libx264 @ 0x3950ce0] Weighted P-Frames: Y:0.0% UV:0.0%
  
      [libx264 @ 0x3950ce0] ref P L0: 98.1%  0.2%  1.1%  0.5%
  
      [libx264 @ 0x3950ce0] ref B L0: 85.1% 13.2%  1.7%
  
      [libx264 @ 0x3950ce0] ref B L1: 93.6%  6.4%
  
      [libx264 @ 0x3950ce0] kb/s:174.10