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• Piping cURL output to FFmpeg doesn't work with mp4 files

  8 novembre 2015, par Konstantin

  I would like to pipe cURL output to FFmpeg the following way in my Ruby script to strip off metadata, chapters and maybe set other metadata too in the future :

  #!/usr/bin/ruby
  
  url=ARGV[0]
  
  
  
  fname=url.split("/").last
  
  extension=File.extname(fname)
  
  options=""
  
  case extension 
  
    when /mp4/i
  
      format="mp4"
  
      options=" -movflags frag_keyframe+empty_moov "
  
    when /avi/i
  
      format="avi"
  
    when /mkv/i
  
      format="matroska"
  
    when /wmv/i
  
      format="asf"
  
    else
  
      format="matroska"
  
   end
  
  
  
  cmd=%Q{ curl -b cookie-file.txt #{url} -L -o - | ffmpeg -y -i - -map 0:v -map 0:a -c:v copy -c:a:0 copy -map_metadata -1 -map_chapters -1 #{options} -f #{format} - | cat > #{fname} }
  
  
  
  system cmd

  When the url (ARGV[0]) points to an .avi, .wmv or .mkv file the script do its job. However when it points to an .mp4 or .mov file it doesn’t work, because the input isn’t seekable and FFmpeg at first try to read the whole input. When url points to an mp4 file, output to stdout even doesn’t work, only when options " -movflags frag_keyframe+empty_moov " is used for the output format. Otherwise I got an error message : "muxer does not support non seekable output". Last cat command is needed because this command pipe will work in a CGI script, and will write its output to STDOUT with appropriate HTTP headers. What options should I use for the input pipe to make my script work with mp4 files too ?

• aacenc : partially revert previous commits to set options via a profile

  17 octobre 2015, par Rostislav Pehlivanov

  aacenc : partially revert previous commits to set options via a profile
  It didn’t work out because of the exceptions that needed to be made
  
  for the "-1" cases and was overall more confusing that just manually
  
  checking and setting options for each profile.
  

  • [DH] libavcodec/aacenc.c
  • [DH] libavcodec/aacenc_utils.h
  • [DH] libavcodec/aacenctab.h

• aacenc : add support for changing options based on a profile

  12 octobre 2015, par Rostislav Pehlivanov

  aacenc : add support for changing options based on a profile
  This commit adds the ability for a profile to set the default
  
  options, as well as for the user to override such options
  
  by simply stating them in the command line while still keeping
  
  the same profile, as long as those options are still permitted by
  
  the profile.
  Example : setting the profile to aac_low (the default) will turn
  
  PNS and IS on. They can be disabled by -aac_pns 0 and -aac_is 0,
  
  respectively. Turning on -aac_pred 1 will cause the profile to be
  
  elevated to aac_main, as long as no options forbidding aac_main
  
  have been entered (like AAC-LTP, which will be pushed soon).
  A useful feature is that by setting the profile to mpeg2_aac_low,
  
  all MPEG4 features will be disabled and if the user tries to enable
  
  them then the program will exit with an error. This profile is
  
  signalled with the same bitstream as aac_low (MPEG4) but some devices
  
  and decoders will fail if any MPEG4 features have been enabled.
  

  • [DH] libavcodec/aaccoder_twoloop.h
  • [DH] libavcodec/aacenc.c
  • [DH] libavcodec/aacenc.h
  • [DH] libavcodec/aacenc_utils.h
  • [DH] libavcodec/aacenctab.h