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• regainplay_analysis : Work around GCC optimizer bug.

  15 juin 2014, par Erik de Castro Lopo

  regainplay_analysis : Work around GCC optimizer bug.
  Discussion : http://lists.xiph.org/pipermail/flac-dev/2014-June/004720.html
  
  Patch-from : lvqcl <lvqcl.mail@gmail.com>
  

  • [DH] src/share/replaygain_analysis/replaygain_analysis.c

• 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 ?

• Don't work some keys of coding in FFmpeg

  17 décembre 2015, par Plush

  <?
  
      // $videoPath — path to the video file
  
      // $newVideoPath — path of the resultant video file
  
  
  
      exec('/usr/bin/ffmpeg -i ' . $videoPath . ' -vcodec libx264 -profile high -level 3.1 -s 1280x720 -sar 1:1 -aspect 16:9 -b:v 3800K -dct8x8 1 -partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 -refs 5 -fast-pskip 0 -subq 9 -me_method full -me_range 32 -mbd rd -flags +mv4+qpel -g 40 -keyint_min 4 -bf 2 -direct-pred 1 -b_strategy 2 -b-pyramid 1 -weightb 1 -weightp 2 -coder 1 -qmin 0 -qdiff 1 -acodec libfaac -ac 2 -ar 48000 -ab 192K ' . $newVideoPath);

  I defined keys which don’t work :
  - dct8x8 1 - partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 (coding of video doesn’t work)
  - me_method full (the video file is coded, but it isn’t started in a player)
  FFmpeg version : 1.2.6

  How to involve an adaptive method of transformations 8x8 in an I-shot and to set a method of an assessment of the movement of full pixel as full ?