[FFmpeg-devel] [PATCH] VBR header for "libmp3lame"

Peter Belkner pbelkner at snafu.de
Fri Apr 15 20:07:27 CEST 2011


in case the switch "-aq" is provided to the "libmp3lame" codec a VBR MP3 
is generated as e.g. in

    ffmpeg -i a.wav -aq 2 b.mp3

This corresponds to

    lame -V2 a.wav b.m3

Unfortunately no VBR header is written often leading to a completely 
wrong estimate of the duration during playback (cf. e.g. 

The patch allows for writing the VBR header as generated by "libmp3lame.a".
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