[Ffmpeg-devel] libavcodec: possible QPEL decoding bug.

Marius the Mad marius_the_mad
Sun Sep 11 22:32:45 CEST 2005

Hello Michael Niedermayer.
Saturday, September 10, 2005, 7:15:18 PM, you wrote:

MN> maybe fixed, iam not sure as its not easy to see ...

I bring a bad news - unfortunately, it isn't. :( Milan kindly provided
me with new ffdshow build and it seems to be worse than before, even...

I prepared a new set of screenshots. Here the are.

Frame 154 by libavcodec: http://img284.imageshack.us/img284/6352/n154a7bm.png
By xvid: http://img284.imageshack.us/img284/4498/n154x2mj.png

Frame 283 by libavcodec: http://img284.imageshack.us/img284/9566/n283a5ry.png
By xvid: http://img140.imageshack.us/img140/5461/n283x1dg.png

Frame 597 by libavcodec: http://img140.imageshack.us/img140/1294/n597a9id.png
By xvid: http://img140.imageshack.us/img140/2001/n597x0yf.png

All screenshots were taken from my first sample video.

I wouldn't bug you about it, but the effect is extremely visible during
the playback. :( Also, I just tried ffdshow build from 12 X 2004, and it
has the same problem. It must have been there for a long time.

I'm really surprised no one noticed it before. Then again, I rarely use
QPEL myself - but sometimes it's very useful.

Sorry for being the messenger with bad news.

Best regards,
Marius the Mad

10:21:02 PM

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