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• ffmpeg concatenate clips with broken timecode

  19 septembre 2018, par Linus679

  I’ve just received some Blackmagic footage and some of the clips are separated into chunks because of dropped frames. So let’s say I have a set of clips that looks like below for a Clip 12.

  0100_C0012_001,
  0100_C0012_002,
  0100_C0012_003,

  Is there a way to create new clip from the 3 with the name 0100_C0012 ? Also, I have to actually concatenate the clips via timecode rather then the name as the numbers seems to break at points for some reason.

  Thanks for any help.

  The info about one of the clips is as follows :

    built with Apple LLVM version 9.1.0 (clang-902.0.39.2)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  
    libavutil      56. 14.100 / 56. 14.100
  
    libavcodec     58. 18.100 / 58. 18.100
  
    libavformat    58. 12.100 / 58. 12.100
  
    libavdevice    58.  3.100 / 58.  3.100
  
    libavfilter     7. 16.100 /  7. 16.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  1.100 /  5.  1.100
  
    libswresample   3.  1.100 /  3.  1.100
  
    libpostproc    55.  1.100 / 55.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '///F_2_2018-07-06_1208_C0012_V1-0002.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2018-09-18T06:53:01.000000Z
  
      timecode        : 12:08:36:15
  
    Duration: 00:00:08.00, start: 0.000000, bitrate: 36177 kb/s
  
      Stream #0:0(eng): Video: dnxhd (DNXHD) (AVdn / 0x6E645641), yuv422p(pc, bt709), 1920x1080, 36175 kb/s, SAR 1:1 DAR 16:9, 24 fps, 24 tbr, 24k tbn, 24k tbc (default)
  
      Metadata:
  
        creation_time   : 2018-09-18T06:53:01.000000Z
  
        handler_name    : Apple Alias Data Handler
  
        encoder         : Avid DNxHD Codec
  
      Stream #0:1(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-09-18T06:53:02.000000Z
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 12:08:36:15
  
  At least one output file must be specified

• FFmpeg os.system commands not working but work in Terminal

  28 janvier 2020, par Oscar Dolloway

  I’ve downloaded ffmpeg through the website and ran some commands through the terminal to confirm its install.

  when running the command ’ffmpeg’ in the Terminal it returns

   ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg 
  
   developers
  
   built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)

  if i type into Python

  import os
  
  os.system ('ffmpeg')

  it returns

   os.system ('ffmpeg')
  
   sh: ffmpeg: command not found
  
   Out[25]: 32512

  any ideas ?

  Solution :

   ffmpeg = '/bin/ffmpeg' #path to the binary file
  
  
  
   os.system(ffmpeg)

  Output :

  os.system (ffmpeg)
  
  ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)

• HTML5 Video OGV conversion on Mac

  19 novembre 2014, par Loren

  When I try recording a screencast with Quicktime or Screenflow and then converting to .ogv for use on the web, I get this error many times :

  $ ffmpeg2theora test.mov
  
  [audioresample @ 0x7fa903800ee0] Audio sample format conversion failed

  The resulting test.ogv file does not play in VLC. I can use ffmpeg to successfully convert mov to mp4. Are there only certain audio types that ffmpeg2theora supports ? ffmpeg2theora version 0.29

  More output :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2013-08-26 20:50:37
  
    Duration: 00:00:07.00, start: 0.000000, bitrate: 1458 kb/s
  
      Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 90 kb/s
  
      Metadata:
  
        creation_time   : 2013-08-26 20:50:37
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1920x1200, 1362 kb/s, 30 fps, 30 tbr, 3k tbn, 6k tbc
  
      Metadata:
  
        creation_time   : 2013-08-26 20:50:37
  
        handler_name    : Apple Alias Data Handler