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• FFmpeg : concatenate m4v-files while preserving vobsub subtitles ?

  27 octobre 2020, par Nick

  I'm trying to concatenate two h.264-m4v files using ffmpeg. At least one of the source files (at least the second, not necessarily the first) contains subtitles in the vobsub format. The source files were created using HandBrake which allows for vobsub inclusion in m4v-containers. The files are exactly the same codec, same resolution, same type.

  


  Let's suppose the source files are called 1.m4v and 2.m4v. The 2.m4v-file contains the following streams which I want to have included in the output file :

  


      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt470bg), 702x574 [SAR 16:15 DAR 1872:1435], 607 kb/s, 25 fps, 25 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2020-10-11T16:02:38.000000Z
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 350 kb/s (default)
    Metadata:
      creation_time   : 2020-10-11T16:02:38.000000Z
      handler_name    : Stereo
    Stream #0:2(eng): Subtitle: dvd_subtitle (mp4s / 0x7334706D), 720x576, 3 kb/s (default)
    Metadata:
      creation_time   : 2020-10-11T16:02:38.000000Z
      handler_name    : SubtitleHandler
    Stream #0:3(eng): Data: bin_data (text / 0x74786574)
    Metadata:
      creation_time   : 2020-10-11T16:02:38.000000Z
      handler_name    : SubtitleHandler


  


  The two files are included in a sources.txt file containing the following lines :

  


  file '1.m4v'
file '2.m4v'


  


  The command in ffmpeg is then executed as follows :

  


  $ ffmpeg -f concat -safe 0 -i sources.txt -c copy output.m4v


  


  The resulting file correctly combines 1 and 2 with all their audio and video streams. However, the subtitle streams are omitted by ffmpeg. The output.m4v file does not contain them (Stream #0:2(eng) and Stream #0:3(eng) are not present) :

  


      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt470bg), 702x576 [SAR 16:15 DAR 13:10], 626 kb/s, 25 fps, 25 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 349 kb/s (default)
    Metadata:
      handler_name    : Stereo


  


  This also happens if I alter the command to use -scodec copy as an option. In this case, the joining-process fails with the following error :

  


  [ipod @ 0x7f7faa00c000] Could not find tag for codec dvd_subtitle in stream #2, codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 -- 


  


  Any idea on how to join the two files while preserving the vobsubs in the resulting m4v-container ?

  


• Why does ffmpeg output frames starting with 0001 instead of 0000 ? [closed]

  3 février 2020, par AMTQ

  I’m using ffmpeg to extract frames from a video. It all works well but something seems strange : The numbering of the output always starts with 0001 instead of 0000. Below a minimum working example, the output from the console and a picture of the generated frames. I’m using windows shell on Win10.

  ffmpeg -i P1390752.MP4 -vframes 4 frame%%04d.png

  Console output :

  C:\Users\xxxx>ffmpeg -i P1390752.MP4 -vframes 4 frame%04d.png
  
  ffmpeg version git-2020-01-15-0dc0837 Copyright (c) 2000-2020 the FFmpeg developers
  
    built with gcc 9.2.1 (GCC) 20200111
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  
    libavutil      56. 38.100 / 56. 38.100
  
    libavcodec     58. 65.103 / 58. 65.103
  
    libavformat    58. 35.102 / 58. 35.102
  
    libavdevice    58.  9.103 / 58.  9.103
  
    libavfilter     7. 71.100 /  7. 71.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000002341f489e40] st: 0 edit list: 1 Missing key frame while searching for timestamp: 3600
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000002341f489e40] st: 0 edit list 1 Cannot find an index entry before timestamp: 3600.
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'P1390752.MP4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp42avc1
  
      creation_time   : 2020-01-29T13:35:55.000000Z
  
    Duration: 00:00:08.16, start: 0.000000, bitrate: 27084 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 26830 kb/s, 50 fps, 50 tbr, 180k tbn, 100 tbc (default)
  
      Metadata:
  
        creation_time   : 2020-01-29T13:35:55.000000Z
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 124 kb/s (default)
  
      Metadata:
  
        creation_time   : 2020-01-29T13:35:55.000000Z
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, image2, to 'frame%04d.png':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp42avc1
  
      encoder         : Lavf58.35.102
  
      Stream #0:0(und): Video: png, rgb24, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 50 fps, 50 tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2020-01-29T13:35:55.000000Z
  
        encoder         : Lavc58.65.103 png
  
  frame=    4 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.08 bitrate=N/A speed=0.0922x
  
  video:5622kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  What I tried so far :
  1) I restricted the output to 4 frames because otherwise it would take ages. But the problem remains the same when I remove the number of frames and extract the whole video. The problem persists when using a starting point with -ss and a duration.
  2) When I use jpg as output I get some warnings about depreceated pixel format, but the numbering issue remains.

  I can not get rid of the first two warnings concerning the keyframe, maybe this is related ?

• Getting "Buffer queue overflow, dropping" while concatenation in ffmpeg

  19 août 2020, par Yevhenii Molodtsov

  I have a python script that generates the FFmpeg command to concatenate the video clips.
Here is the script :

  


          ffmpeg 
        -i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_eba59811-bb5c-4e36-aa7d-b1731e70432c.mp4 
        -i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_2a6d7907-7cad-4f38-ae82-4b475546d3e0.mp4 
        -i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_d7371ecb-01df-4199-951f-336fa475998f.mp4 
        -i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_cc5de0f1-84b4-47bc-b390-45b5f8711914.mp4 
        -i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_bf796e0d-135f-40fd-ab8e-4780da6973fd.mp4  
        -filter_complex 
        "[0:v]trim=start=0:end=8.032,setpts=PTS-STARTPTS[clip0];
        [1:v]trim=start=2:end=13.047,setpts=PTS-STARTPTS[clip1];
        [2:v]trim=start=2:end=13.558,setpts=PTS-STARTPTS[clip2];
        [3:v]trim=start=2:end=13.186,setpts=PTS-STARTPTS[clip3];
        [4:v]trim=start=2,setpts=PTS-STARTPTS[clip4];
        [0:v]trim=start=9.032:end=10.032,setpts=PTS-STARTPTS[out0];
        [1:v]trim=start=14.047:end=15.047,setpts=PTS-STARTPTS[out1];
        [2:v]trim=start=14.558:end=15.558,setpts=PTS-STARTPTS[out2];
        [3:v]trim=start=14.186:end=15.186,setpts=PTS-STARTPTS[out3];
        [1:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in1];
        [2:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in2];
        [3:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in3];
        [4:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in4];
        [in1]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein1];
        [in2]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein2];
        [in3]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein3];
        [in4]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein4];
        [out0]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout0];
        [out1]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout1];
        [out2]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout2];
        [out3]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout3];
        [fadein1]fifo[fadein1fifo];
        [fadein2]fifo[fadein2fifo];
        [fadein3]fifo[fadein3fifo];
        [fadein4]fifo[fadein4fifo];
        [fadeout0]fifo[fadeout0fifo];
        [fadeout1]fifo[fadeout1fifo];
        [fadeout2]fifo[fadeout2fifo];
        [fadeout3]fifo[fadeout3fifo];
        [fadeout0fifo][fadein1fifo]overlay[crossfade0];
        [fadeout1fifo][fadein2fifo]overlay[crossfade1];
        [fadeout2fifo][fadein3fifo]overlay[crossfade2];
        [fadeout3fifo][fadein4fifo]overlay[crossfade3];
        [clip0][crossfade0][clip1][crossfade1][clip2][crossfade2][clip3][crossfade3][clip4]concat=n=9[output];
         [0:a][1:a]acrossfade=d=10:c1=tri:c2=tri[A1];
         [A1][2:a]acrossfade=d=10:c1=tri:c2=tri[A2];
         [A2][3:a]acrossfade=d=10:c1=tri:c2=tri[A3];
         [A3][4:a]acrossfade=d=10:c1=tri:c2=tri[audio] " -map "[output]" -map "[audio]" /tmp/media/final/some_filename_587463a2-e3ca-436a-874b-a72e295e46ac.mp4


  


  But I get the following error : Buffer queue overflow, dropping.
I read that to solve this I need to use fifo, but I can't figure out where should I place it. I addition, it seems like fifo works only with video streams.
I would much appreciate any help !