Changes between Version 21 and Version 22 of Encode/AAC


Ignore:
Timestamp:
Nov 11, 2013, 7:28:55 AM (13 years ago)
Author:
llogan
Comment:

Remove comment. Currently only the ‘aac_low’ (default) profile supports VBR mode. This is already stated.

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  • Encode/AAC

    v21 v22  
    4242
    4343Target a ''quality'', rather than a specific ''bit rate''. 1 is lowest quality and 5 is highest quality. Test it out and use the lowest setting that works for you. This mode is not compatible with [[#fdk_he|AAC-HE]], but for AAC-LC (the default for ffmpeg, and most compatible [[http://en.wikipedia.org/wiki/Advanced_Audio_Coding#Modular_encoding|AAC profile]]) it should probably be preferred, since it allows the encoder greater flexibility to distribute bits as it sees fit. Set the VBR level with the `-vbr` flag.
    44 
    45 ''Note, that at the moment (FFmpeg 2.1) the VBR setting is unsupported and only works with some parameter combinations.''
    4644
    4745According to [[http://www.hydrogenaudio.org/forums/index.php?showtopic=95989|this hydrogenaudio post]], the VBR modes (on average, over a number of files) give the following bit rates per channel (so for stereo, double the bit rate; for 5.1 surround sound, multiply it by six):