[FFmpeg-devel] [PATCH] VBR header for "libmp3lame"
michaelni at gmx.at
Sat Apr 16 16:21:40 CEST 2011
On Sat, Apr 16, 2011 at 03:35:35PM +0200, Reimar Döffinger wrote:
> On Fri, Apr 15, 2011 at 08:07:27PM +0200, Peter Belkner wrote:
> > Hi,
> > 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. http://lists.mplayerhq.hu/pipermail/ffmpeg-user/2007-October/011573.html).
> > The patch allows for writing the VBR header as generated by "libmp3lame.a".
> Unfortunately I don't know what exactly the header contains, but I think
and i think it should be generated in the mp3 muxer independant of
the encoder doing anything special
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
The misfortune of the wise is better than the prosperity of the fool.
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