[FFmpeg-devel] [PATCH] mpeg4videodec: silence "Invalid and inefficient vfw-avi packed B frames detected" warning

Michael Niedermayer michaelni at gmx.at
Thu Aug 29 16:44:21 CEST 2013

On Thu, Aug 29, 2013 at 04:38:30AM +0200, Reimar Döffinger wrote:
> On 29.08.2013, at 00:29, wm4 <nfxjfg at googlemail.com> wrote:
> > ---
> > I mentioned it on IRC, and it wasn't really clear why this message is
> > needed. On the other hand, this is printed with virtually every AVI
> > file, and raises more questions than it answers, so I guess this is up
> > to discussion.
> The reason the warning is that files with this feature were written by broken software, the files are incorrect and waste space.

they arent valid mpeg4 in avi
they could be considered valid divx in avi though if "you" simply
define that to be valid for divx

> IIRC programs like virtualdub can fix these broken files, at least losslessly, possibly even in-place.

can someone confirm that ?

(iam asking as this seems almost the only use the warning would have
 to an end user)


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Everything should be made as simple as possible, but not simpler.
-- Albert Einstein
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