Archive:Kdenlive/Manual/Project Menu/Render/Render Profile Parameters: Difference between revisions

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    Revision as of 06:58, 1 November 2012

    Render Profile Parameters - How to read them

    The parameters that go into a render profile derive from the ffmpeg program. This is a worked example to show how you can understand what these parameters mean using the ffmpeg documentation.

    In the example above the parameters are:

    f=dvd 
    vcodec=mpeg2video 
    acodec=mp2  
    b=5000k 
    maxrate=8000k 
    minrate=0 
    bufsize=1835008 
    mux_packet_s=2048 
    mux_rate=10080000 
    ab=192k 
    ar=48000 
    s=720x576 
    g=15 
    me_range=63 
    trellis=1 
    profile=dv_pal_wide 
    pass=2
    

    Looking up the ffmpeg help translates these parameters as:

    a main option is

    -f fmt              force format
    

    video options are

    -vcodec codec     force video codec ('copy' to copy stream)
    -pass n                select the pass number (1 or 2)
    -b bitrate             set bitrate (in bits/s)
    -vb bitrate           set bitrate (in bits/s)
    -s size                 set frame size (WxH or abbreviation)
    -me_range          <int>   E.V.. limit motion vectors range (1023 for DivX player)
    -trellis                  <int>   E.VA. rate-distortion optimal quantization
    

    audio options are

    -acodec codec      force audio codec ('copy' to copy stream)
    -ab bitrate             set bitrate (in bits/s)
    -ar rate                  set audio sampling rate (in Hz)
    

    The AVCodecContext AVOptions include:

    -b                 <int>   E.V.. set bitrate (in bits/s)
    -maxrate      <int>   E.V.. set max video bitrate tolerance (in bits/s)
    -minrate       <int>   E.V.. set min video bitrate tolerance (in bits/s)
    -g                 <int>   E.V.. set the group of picture size
    

    So all the render profile options are documented here in the ffmpeg documentation.