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Sur d’autres sites (6955)

  • 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 ?

  • 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 ?

    


  • ffmpeg - DF vs NDF (Drop Frames) vs (Non Drop Frames), how to simply pass input timecode to output

    24 septembre 2020, par Selene

    Please help with this issue. The broadcaster just rejected my submitted video because their validation tool threw this kind of error :

    


    


    was configured as "Non drop Frame". "Drop Frame" expected.

    


    


    I'm only processing video, and I expect the audio to just be copied from input to output.
Running and comparing input with output using ffprobe shows difference in timecode :

    


      Metadata:
    major_brand     : qt  
    minor_version   : 537199360
    compatible_brands: qt  
    creation_time   : 2020-02-29T22:07:42.000000Z
  Duration: 00:00:20.05, start: 0.000000, bitrate: 133935 kb/s
    Stream #0:0(eng): Video: dvvideo (dvh6 / 0x36687664), yuv422p(bt709, top coded first (swapped)), 1280x1080 [SAR 3:2 DAR 16:9], 115084 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 29.97 tbc (default)
    Metadata:
      creation_time   : 2020-02-29T22:07:42.000000Z
      handler_name    : Apple Video Media Handler
      encoder         : DVCPRO HD 1080i60
      timecode        : 00:00:00;00
    Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2020-02-29T22:07:42.000000Z
      handler_name    : Apple Sound Media Handler
      timecode        : 00:00:00;00
    Stream #0:2(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2020-02-29T22:07:42.000000Z
      handler_name    : Apple Sound Media Handler
      timecode        : 00:00:00;00
    Stream #0:3(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
    Metadata:
      creation_time   : 2020-02-29T22:07:42.000000Z
      handler_name    : Apple Sound Media Handler
      timecode        : 00:00:00;00


    


    After video conversion, the output of ffprobe :

    


      Metadata:
    major_brand     : qt  
    minor_version   : 512
    compatible_brands: qt  
    encoder         : Lavf58.58.100
  Duration: 00:00:20.05, start: 0.000000, bitrate: 167037 kb/s
    Stream #0:0(eng): Video: prores (XQ) (ap4x / 0x78347061), yuv422p12le(tv, bt709, top coded first (swapped)), 1920x1080, 148578 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default)
    Metadata:
      handler_name    : Apple Video Media Handler
      encoder         : Lavc58.106.100 prores_ks
      timecode        : 00:00:00:00
    Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s (default)
    Metadata:
      handler_name    : Apple Sound Media Handler
    Stream #0:2(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s (default)
    Metadata:
      handler_name    : Apple Sound Media Handler
    Stream #0:3(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s (default)
    Metadata:
      handler_name    : Apple Sound Media Handler


    


    My encoding string looks like this :

    


    ffmpeg -i input.mov -vf scale=1920x1080 -map 0:v? -map 0:a? -map 0:s? -map 0:d? -b:v 115084915 -maxrate 115084915 -minrate 115084915 -c:v prores_ks -profile:v 5 -preset ultrafast -crf 0 -c:a copy -c:s copy -y output.mov


    


    Please help !