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• Resume transcoding a video with ffmpeg

  25 November 2014, by Jonathan.

  I have a node server that uses child-process to use ffmpeg to convert a video to mp4. However if the server crashes while transcoding, then I’d like to resume transcoding the file (similar to -C with curl).

  I figured I could just start transcoding the file from where it finished to a seperate file and then just concat the two. And while transcoding the file from where it finished works and the file that starts midway plays back fine, when I concat the two files with ffmpeg -i "concat:part1.mp4|part2.mp4" -c copy ouput.mp4 Only the first part will play, and when it gets to the second part it just stays on the last frame of the first part or goes black depending on the video player. (But playing part2.mp4 itself works fine)

  There isn’t any error during either conversion or the concat.

• ffmpeg is failing to convert mov files from iPhone 4

  11 October 2014, by skat

  I’m having issue with converting mov files from iPhone 4.

  Running this command:

  I, [2014-09-15T03:48:33.245231 #9676]  INFO -- : Running transcoding...
  
  ffmpeg -y -i /Users/lun/client/bookagoo/public/uploads/5405e9b0486f75a36c100000/video/1410727644xqxzdoxf-IMG_0040_1_.MOV -ss 5 -vframes 1 -f image2 /Users/lun/client/bookagoo/public/uploads/5405e9b0486f75a36c100000/video/1410727644xqxzdoxf-IMG_0040_1_-edited.jpg
  
  
  
  E, [2014-09-15T03:48:33.321367 #9676] ERROR -- : Failed encoding...
  
  ffmpeg -y -i /Users/lun/client/bookagoo/public/uploads/5405e9b0486f75a36c100000/video  /1410727644xqxzdoxf-IMG_0040_1_.MOV -ss 5 -vframes 1 -f image2 /Users/lun/client/bookagoo/public/uploads/5405e9b0486f75a36c100000/video/1410727644xqxzdoxf-IMG_0040_1_-edited.jpg

  My ffmpeg gives me errors like this:

  FFMPEG::Error: Failed encoding.Errors: no output file created. Full output: ffmpeg version 2.3.1 Copyright (c) 2000-2014 the FFmpeg developers
  
  built on Aug 20 2014 02:23:29 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
  
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-libtheora --enable-libvorbis --enable-libvpx
  
  libavutil      52. 92.100 / 52. 92.100
  
  libavcodec     55. 69.100 / 55. 69.100
  
  libavformat    55. 48.100 / 55. 48.100
  
  libavdevice    55. 13.102 / 55. 13.102
  
  libavfilter     4. 11.100 /  4. 11.100
  
  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
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/lun/client/bookagoo/public/uploads/5405e9b0486f75a36c100000/video/1410641311nyv99k1j-IMG_0040_1_.MOV':
  
  Metadata:
  
    major_brand     : qt
  
    minor_version   : 0
  
    compatible_brands: qt
  
  creation_time   : 2014-07-20 09:47:08
  
  model           : iPhone 4
  
  model-rus       : iPhone 4
  
  encoder         : 7.0.4
  
  encoder-rus     : 7.0.4
  
  date            : 2014-07-20T13:47:08+0400
  
  date-rus        : 2014-07-20T13:47:08+0400
  
  make            : Apple
  
  make-rus        : Apple
  
  Duration: 00:00:01.84, start: 0.000000, bitrate: 827 kb/s
  
    Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 480x360, 742 kb/s, 23.98 fps, 23.98 tbr, 600 tbn, 1200 tbc (default)
  
  Metadata:
  
    rotate          : 90
  
    creation_time   : 2014-07-20 09:47:08
  
    handler_name    : Core Media Data Handler
  
    encoder         : H.264
  
  Side data:
  
    displaymatrix: rotation of -90.00 degrees
  
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
  
  Metadata:
  
    creation_time   : 2014-07-20 09:47:08
  
    handler_name    : Core Media Data Handler
  
  [swscaler @ 0x7fe1e9800600] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, image2, to '/Users/lun/client/bookagoo/public/uploads/5405e9b0486f75a36c100000/video/1410641311nyv99k1j-IMG_0040_1_-edited.jpg':
  
  Metadata:
  
  major_brand     : qt
  
  minor_version   : 0
  
  compatible_brands: qt
  
  make-rus        : Apple
  
  model           : iPhone 4
  
  model-rus       : iPhone 4
  
  make            : Apple
  
  encoder         : Lavf55.48.100
  
  date            : 2014-07-20T13:47:08+0400
  
  date-rus        : 2014-07-20T13:47:08+0400
  
  Stream #0:0(und): Video: mjpeg, yuvj420p, 480x360, q=2-31, 200 kb/s, 23.98 fps, 23.98 tbn, 23.98 tbc (default)
  
  Metadata:
  
    rotate          : 90
  
    creation_time   : 2014-07-20 09:47:08
  
    handler_name    : Core Media Data Handler
  
    encoder         : Lavc55.69.100 mjpeg
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  frame=    0 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.00 bitrate=N/A
  
  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)

  It’s only happening for mov files. There are couple of tricky places it looks like it’s trying to take screenshot from a video.

  Maybe anyone witnessed anything similar and can give me a tip?

• Is there any way to combine PNGs as a Quicktime-compatible MP4 from FFMPEG?

  12 April 2020, by griffin2000

  Is there any way to get combine PNGs as a Quicktime-compatible MP4 from FFMPEG?

  



  I'm using this command currently:

  



  ffmpeg -i frame%03d.png -pix_fmt yuv420p  output.mp4


  



  This is the video works fine in VLC and can be uploaded to Youtube/Vimeo/Facebook fine but Quicktime complains that it "cannot be opened":


  



  A few questions (e.g. https://apple.stackexchange.com/questions/166553/why-wont-video-from-ffmpeg-show-in-quicktime-imovie-or-quick-preview) about this at various sources, but none of the answers seem to work and they all seem to boil to down to some variant of "use yuv420p" or a couple of other flags. None of which seems to work. Apparently it may have changed in later (post-Yosemite) versions of MacOS?

  



  So what (if anything) is the magic incantation that make this work with later versions of Quicktime?

  



  Thanks all

  



  ffprobe output below FYI:

  



  ffprobe version 4.2.2 Copyright (c) 2007-2019 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  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 '/Users/xxx/Downloads/output (14).mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.20.100
  Duration: 00:00:02.72, start: 0.000000, bitrate: 677 kb/s
    Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p, 1714x1630, 672 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler