[FFmpeg-devel] Exposing preroll and remainder info for aac and mp3.

Michael Niedermayer michaelni at gmx.at
Sun Jul 15 16:21:41 CEST 2012

On Mon, Jul 09, 2012 at 11:08:07AM -0700, Dale Curtis wrote:
> On Wed, Jul 4, 2012 at 2:21 PM, Michael Niedermayer <michaelni at gmx.at>wrote:
> >
> > just posted a patchset implementing initial silence skiping for mp3
> > doing the same with mov/mp4 aac should be trivial, id need a reference
> > sample though to make sure the aac/mov/mp4 stuff is correct. Its easy
> > to get it wrong without a testcase ...
> >
> > the mp3 code should be compatible with lames way of indicating the
> > amount of padding.
> >
> >
> Thanks Michael! The AAC audio files from the demo page are good samples:
> MP3:
> http://rtoy.github.com/webaudio/codec-tests/resources/media/square3.mp3

fixed initial silence skiping

> AAC:
> http://rtoy.github.com/webaudio/codec-tests/resources/media/square3.m4a

posted a patch that will fix the initial silence on this as well
but this file is using just 1 of 3 ways by which mp4-aac can specify
the initial silence.
Implementing the other 2 is trivial but i dont want to implement them
without sample files to test with. It would have a high potential
to introduce bugs (noone would notice if we are 5 samples off)
do you happen to have samples that use the other variants ?

ill look into the trailing silence soon


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

In fact, the RIAA has been known to suggest that students drop out
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