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

[Reimar Döffinger]

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