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I have a large collection of Blu-Ray disks that I decided to rip the main feature of into MKV using makemkv and use XBMC to play them back. I found that I have a big issue with many (but not all) the Criterion Collection rips. Many of them seem to play back in (very) slow motion, like 2 frames a second or so (actually when I turned on debugging it displayed 3.9FPS !) while other Criterion Collection BD rips playback fine (24.0 FPS). Only Criterion BD rips have this problem. Also, if I use VLC (unfortunately on a different computer so it may not be a valid test) the same problematic rips playback just fine.

I am running XBMC 10.0 r35648 (Compiled : Dec 17 2010)
Ubuntu Lucid (10.04) - 2.6.32-29-generic #58-Ubuntu SMP i686
The XBMC computer is a Giada N20 (1.8GHz Intel Atom D525 dual-core processor, 2GB RAM, NVIDIA ION 2 graphics card)

I ran mediainfo on two such MKVs, one on a rip that works fine and another on one that does not but I didn't see anything that caught my eye.

Broadcast news (works fine) mediainfo: http://pastebin.com/8TMeCDJq
Amarcord (has the slow-mo problem) mediainfo: http://pastebin.com/d6hMS8We

I can see in the log many errors like the following:

Code:
ERROR: CDVDAudio::AddPacketsRenderer - timeout adding data to renderer

ERROR: AddPackets - failed to add leftover bytes to render

DEBUG: CDVDPlayerAudio:: Discontinuity - was:1143487.115000, should be:135000.000000, error:-1008487.115000

Log file for movie with playback problems: http://pastebin.com/tvPHHBPk
Log file for movie which playback fine: http://pastebin.com/CmjURBpS

Any idea what may be the problem and how to fix it?

Well, after trying all kind of permutations I ended up figuring out that the problem is that XBMC has a problem playing back the PCM stream which slows down the playback to less then 4 FPS. I ended up converting, in one case as a test, the PCM stream to AC3 and now the playback is fine.

What I am confused about is the fact that VLC has no problem playing back the PCM version. Why does XBMC have this problem?

In case anyone else runs into the same problem, it has to do with mono PCM which Dharma has a problem with.

See my bug report: http://trac.xbmc.org/ticket/11284

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