[FFmpeg-devel] [PATCH] Incorrect ASF duration

Michael Niedermayer michaelni
Fri Apr 18 05:15:32 CEST 2008

On Fri, Apr 18, 2008 at 01:05:52AM +0200, Henrik Gulbrandsen wrote:
> This is similar to the Ogg problem. The stream duration is not identical
> to the PTS of the last packet if the packet duration is non-negligible.
> The attached examples show the result of
>     ffmpeg -i video.mp4 -vcodec wmv2 -f asf video.wmv
>     ffplay -stats video.wmv > report.txt 2>&1
> before and after the patch. As before, video.mp4 is exactly 24 seconds
> long, at 10 fps. Notice the "Duration: 00:00:23.90" for stats given with
> the current code base!

This shows that there is likely a bug in the asf demuxer or asf muxer,
what makes you belive it is the muxer that needs correction.
What i see is a 50% chance of fixing a bug and a 50% chance of introducing
a new bug instead.
I suggest you use some "official" asf encoder and encode a video of known
length and then check what is written in the file.

Also i suspect that the regression test checksums will change by such
a change to the muxer thus would need to be updated by your patch.

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

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