FYI - There has been a significant update to the filters being used by MC as part of the automated Direct Show playback (
http://wiki.jriver.com/index.php/Red_October) including replacing FFDSHOW with LAVVideo and the use of madVR's HW assisted deinterlacing option where appropriate.
The changes are working so well for me that on the HTPC I have even removed the nVidia 550Ti card I was using as the IGP HD3000 (part of the i7 2600K) works just fine for the majority of content. That said, there are 1001 different HW combo's out there so please post any issues, comment or findings.
If you have an issue, then post:
1) Your MC Config, eg RO or ROHQ, what Audio Connection / DSP you are using, etc.
2) The details of your file, eg the utility "MediaInfo" will provide info like below
General
ID : 0 (0x0)
Complete name : \\MAIN\Media\Video\TV Series\Downton Abbey\Downton Abbey S01E02.m2ts
Format : BDAV
Format/Info : Blu-ray Video
File size : 9.17 GiB
Duration : 49mn 33s
Overall bit rate : 26.5 Mbps
Maximum Overall bit rate : 48.0 Mbps
Video
ID : 4113 (0x1011)
Menu ID : 1 (0x1)
Format : VC-1
Format profile : AP@L3
Codec ID : 234
Duration : 49mn 33s
Bit rate : 23.4 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 23.976 fps
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.471
Stream size : 8.10 GiB (88%)
Audio #1
ID : 4352 (0x1100)
Menu ID : 1 (0x1)
Format : DTS
Format/Info : Digital Theater Systems
Format profile : MA / Core
Muxing mode : Stream extension
Codec ID : 134
Duration : 49mn 33s
Bit rate mode : Variable
Bit rate : 1 558 Kbps / 1 510 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Compression mode : Lossless / Lossy
Audio #2
ID : 4353 (0x1101)
Menu ID : 1 (0x1)
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Codec ID : 129
Duration : 49mn 33s
Bit rate mode : Constant
Bit rate : 448 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 159 MiB (2%)
You may also need at some point the ability to provide a short sample