Hello,

I recently upgraded VLC and found that some H.264 MKV videos that played without 
problems in 0.8.6i now have choppy picture in 0.9.8a.

I can produce this problem (correct playback in 0.8.6i but incorrect in 0.9.8a)
on two different computers: 

- 1.5 GHz Pentium M laptop running Windows XP SP2 (32-bit)
  with integrated graphics (circa 2005)

- 2.0 GHz 8-core Xeon desktop running Windows XP x64 
  with NVidia Quadro NVS 285 graphics (circa 2007)


I copied the first 5MB of one such problem video to a separate sample file, and this 
sample reproduces the problem (plays fine in 0.8.6i, but picture is choppy in 0.9.8a).
I uploaded the sample here:
ftp://streams.videolan.org/incoming/smooth-in-0.8.6-but-choppy-in-0.9.8a.mkv

The original file is encoded from DVD source using Handbrake 0.9.2.

When playing this sample in 0.9.8a, the Messages window doesn’t report any errors
 besides “cannot load some cues/chapters/tags etc. (broken seekhead or file)” 
which I presume is because the file is only the first 5MB of a larger MKV file.

I also tried to find the earliest version after 0.8.6i which gave choppy playback
on the sample.  I didn’t see Win32 binaries on the FTP site for 0.9.0 or 0.9.1,
but 0.9.2 does have the choppiness.  So if this issue is a “bug” then I guess it
was introduced somewhere between 0.8.6i and 0.9.2

Has this issue been addressed somewhere already?   If so, I’d appreciate a pointer
to the discussion.  

If not, I’d be happy to provide any more information or help to people who can
fix this issue.

Thanks for your time,

Gabriel Rosenhouse
gabriel.i.r@gmail.com