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• ffmpeg adding 6 secs of black frames in the beginning of a file

  7 août 2014, par user3842039

  Trying to convert a .mov file (h264 and pcm) generated in Mpegstreamclip (MacOS) and the result is strangely out of sync with around 6 seconds of black frames at the beginning. I have tried many differente audio and video codec and the result is the same even with a -vcodec copy and -acodec copy. Below the return of ffmpeg (git version compiled today - 06/08/2014) :

          ffmpeg -i /media/dados/x/PGM-970.mov -vcodec copy -acodec copy  /media/dados/convertidos/PGM-970-converted-ffmpeg-compilado.mov 
  
      ffmpeg version 2.3.git-1ace957 Copyright (c) 2000-2014 the FFmpeg developers
  
        built on Jul 26 2014 20:25:06 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
        configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-x11grab --enable-libpulse --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr
  
        libavutil      52. 92.101 / 52. 92.101
  
        libavcodec     55. 69.100 / 55. 69.100
  
        libavformat    55. 49.100 / 55. 49.100
  
        libavdevice    55. 13.102 / 55. 13.102
  
        libavfilter     4. 11.102 /  4. 11.102
  
        libavresample   1.  3.  0 /  1.  3.  0
  
        libswscale      2.  6.100 /  2.  6.100
  
        libswresample   0. 19.100 /  0. 19.100
  
        libpostproc    52.  3.100 / 52.  3.100
  
      [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ddac20] multiple edit list entries, a/v desync might occur, patch welcome
  
      [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ddac20] Concatenated H.264 or H.265 might not play correctly.
  
      Guessed Channel Layout for  Input Stream #0.1 : mono
  
      Guessed Channel Layout for  Input Stream #0.2 : mono
  
      Guessed Channel Layout for  Input Stream #0.3 : mono
  
      Guessed Channel Layout for  Input Stream #0.4 : mono
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/media/dados/x/PGM-970.mov':
  
        Metadata:
  
          major_brand     : qt  
  
          minor_version   : 537199360
  
          compatible_brands: qt  
  
          creation_time   : 2014-08-01 16:50:24
  
        Duration: 00:24:56.30, start: 0.000000, bitrate: 8350 kb/s
  
          Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte1File '/media/dados/convertidos/PGM-970-converted-ffmpeg-compilado.mov' already exists. Overwrite ? [y/N] y
  
  
  
  70m), 720x480, 5258 kb/s, 29.97 fps, 29.97 tbr, 2997 tbn, 5994 tbc (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        handler_name    : Apple Alias Data Handler
  
        encoder         : H.264
  
        timecode        : 01:00:00;00
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 1 channels, s16, 768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        File '/media/dados/convertidos/PGM-970-converted-ffmpeg-compilado.mov' already exists. Overwrite ? [y/N] yhandler_name    : Apple Alias Data Handler
  
      Stream #0:2(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 1 channels, s16, 768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:3(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 1 channels, s16, 768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:4(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 1 channels, s16, 768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:5(eng): Data: none (tmcd / 0x64636D74) (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:51:16
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 01:00:00;00
  
  
  
  Output #0, mov, to '/media/dados/convertidos/PGM-970-converted-ffmpeg-compilado.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      encoder         : Lavf55.49.100
  
      Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 720x480, q=2-31, 5258 kb/s, 29.97 fps, 11988 tbn, 2997 tbc (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        handler_name    : Apple Alias Data Handler
  
        encoder         : H.264
  
        timecode        : 01:00:00;00
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, 768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        handler_name    : Apple Alias Data Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help

  Even ignoring the audio stream with "-an" ffmpeg persists to add the frames and alter the output duration.

  Any help is very much appreciated ! thanks in advance

• creating Homebrew symlink for beginners

  19 mars 2021, par Platypore

  I am having issues installing the Rust dependency while trying to install ffmpeg through Homebrew on macOS 10.3.6. Terminal just eventually hangs, as is well known in other posts about the topic for Sierra (and I guess High Sierra too). I have installed Rust subsequently using the following command from their website :

  


  curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh


  


  It seems I need to now create a symlink between the Rust directory created by the above command and Homebrew so that Homebrew can recognize the dependency as being installed, but I am absolutely not versed in how to do this ; my terminal knowledge is limited to very simple basics and plugging in code from other answers has not worked. I don't have the knowledge to discern what is a generic path meant to be replaced by specific locations and what is meant to be left as is when it comes to terminology such as prefix and $PATH.

  


  I believe the following are the paths I need to symlink to continue on with my installation of ffmpeg, but I honestly have no idea.

  


  /Users/usr/.rustup/toolchains/stable-x86_64-apple-darwin/bin/rustc 
/Users/usr/.rustup/toolchains/stable-x86_64-apple-darwin/bin/cargo


  


  Could anyone please help and explain step-by-step how to go about doing this ?

  


• lavf/movenc : write track title metadata for mov files

  19 mars 2018, par Courtland Idstrom

  lavf/movenc : write track title metadata for mov files
  Track title (atom 'name') is a well defined user data atom for mov files. Existing code (for mp4) only writes title metadata if present.
  Relevant reference docs :
    https://developer.apple.com/library/content/documentation/QuickTime/Reference/QTRef_AtomsResources/Content/QTRef_AtomsResources4.html#//apple_ref/doc/uid/TP40004285-DontLinkChapterID_1--udta-
  
    https://developer.apple.com/library/content/documentation/QuickTime/QTFF/QTFFChap2/qtff2.html#//apple_ref/doc/uid/TP40000939-CH204-63839
  

  • [DH] libavformat/movenc.c