Mkv problem
 

I know you get a lot of these threads, but I can't find one for a thread that deals with sound drop and slow down outta sync. I been trying to get my computer back to normal after a hard driver format. Since the format my MKV have been dropping sound after a few minutes then video slows down and becomes out of sync. Here is the thing though, before the format I could watch 720dp MKV no problem.

My rig is,
Intel Pentium 4 3.00Ghz
3Gb memory
ATi Radeon HD 4300

Render test
File: F:\Downloads\[Mazui]_To_Aru_Kagaku_no_Railgun_-_14_[9C67EFA2].mkv

Filter 0: Default DirectSound Device
Filename: C:\Windows\system32\quartz.dll
Filter CRC: 990A4D90
Date: 2009-07-13 | 18:16:12
Filter 1: Video Renderer
Filename: C:\Windows\system32\quartz.dll
Filter CRC: 990A4D90
Date: 2009-07-13 | 18:16:12
Filter 2: Microsoft DTV-DVD Audio Decoder
Filename: C:\Windows\System32\msmpeg2adec.dll
Filter CRC: 4688B24D
Date: 2009-07-13 | 18:15:45
Filter 3: DirectVobSub (auto-loading version)
Filename: C:\Program Files\Combined Community Codec Pack\Filters\VSFilter.dll
Filter CRC: B787032D
Date: 2009-08-30 | 23:51:48
Filter 4: Microsoft DTV-DVD Video Decoder
Filename: C:\Windows\System32\msmpeg2vdec.dll
Filter CRC: A51FECEA
Date: 2009-07-13 | 18:15:46
Filter 5: F:\Downloads\[Mazui]_To_Aru_Kagaku_no_Railgun_-_14_[9C67EFA2].mkv
Filename: C:\Program Files\Combined Community Codec Pack\Filters\Haali\splitter.ax
Filter CRC: 125697A6
Date: 2009-03-24 | 21:32:24

I had similar problem on my corporate laptop. It was because of dpc caused by a faulty sata driver.
You may want to run the "dpclatency" tool to check if it's the cause ;)

This is why. Use a real decoder.

Suggestion: reinstall CCCP and select "Reset all settings" when prompted.

^After that, open the video in Media Player Classic
and list everything under 'Play-> Filters'.