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• doc/filters : itemize examples for pad filter, and fix a few typos

  21 août 2012, par Stefano Sabatini

  doc/filters : itemize examples for pad filter, and fix a few typos

• ffmpeg splitting RGB and Alpha channels using filter

  29 juin 2012, par Dow

  I'm trying to use ffmpeg to split an input file into two separate files :

  1. An MP4 with only R,G and B channels
  2. An MP4 with the "extracted" A channel (a so-called Key clip, see http://ffmpeg-users.933282.n4.nabble.com/quot-Extracting-quot-Alpha-Channel-td3700227.html)

  I've managed to do both, but now I want to combine them into one single command. Here's what I do :

  ffmpeg -r $FPS -y -i input.flv -vcodec libx264 -vpre ipod640 -acodec libfaac -s 256x256 -r $FPS -filter_complex INSERT_FILTER_HERE rgb.mp4 alpha.mp4

  where INSERT_FILTER_HERE is :

  format=rgba, split [rgb_in][alpha_in];
  
  [rgb_in] fifo, lutrgb=a=minval [rgb_out];
  
  [alpha_in] format=rgba, split [T1], fifo, lutrgb=r=maxval:g=maxval:b=maxval, [T2] overlay [out];
  
  [T1] fifo, lutrgb=r=minval:g=minval:b=minval [T2]

  In short, I split the file into two streams, for the first stream, I "remove" the alpha channel, for the second stream, I extract a grayscale representation of the alpha channel. When I put this through graph2dot, it works fine, with a nullsink as output.

  However, when I run it in ffmpeg with -filter_complex, I get :

  ffmpeg version N-41994-g782763e Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Jun 28 2012 17:45:15 with gcc 4.6.3
  
    configuration: --enable-gpl --enable-nonfree --enable-pthreads --enable-filters --enable-libfaac --enable-libmp3lame --enable-libx264 --enable-libtheora --enable-libvpx --enable-postproc --enable-avfilter
  
    libavutil      51. 63.100 / 51. 63.100
  
    libavcodec     54. 29.101 / 54. 29.101
  
    libavformat    54. 11.100 / 54. 11.100
  
    libavdevice    54.  0.100 / 54.  0.100
  
    libavfilter     3.  0.100 /  3.  0.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, flv, from 'input.flv':
  
    Metadata:
  
      audiodelay      : 0
  
      canSeekToEnd    : true
  
    Duration: 00:01:10.56, start: 0.000000, bitrate: 1964 kb/s
  
      Stream #0:0: Video: vp6a, yuva420p, 800x950, 1536 kb/s, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: mp3, 44100 Hz, stereo, s16, 128 kb/s
  
  [graph 0 input from stream 0:0 @ 0x2e4c6e0] w:800 h:950 pixfmt:yuva420p tb:1/30 fr:30/1 sar:0/1 sws_param:flags=2
  
  Output pad "default" for the filter "Parsed_lutrgb_3" of type "lutrgb" not connected to any destination

  Any ideas on how I make ffmpeg recognize that it has to write [rgb_out] to rgb.mp4 and [out] to alpha.mp3 ?

  Thanks in advance !

• Get output data from x264vfw filter

  23 août 2012, par no.Oby

  I need get H264 stream from x264 encoder and make some kind of live streaming server. Client will connect to the server, then via rtsp recieve video. How can I get data from x264vfw output pin ?
  In what way better do that ?