HDTV Stuttering (Only TV, and no problems in XBMC PVR) (1 Viewer)

[SciDoctor]

I see the graphs, MP isn't good.

I see you are using an output resolution to your monitor that is probably too high for your GPU with MP, sad but true, my HD4200 is best at 1366x768 desktop res to my 1920x1200 monitor, try settings lower than this to see if you have any improvements.
Turn off any post processing in MP, especialy FFWDshow with LAV as another test.

Had a longer test of XBMC 11.0 and very impressed with preveous caveats, will try it output 1920x1200 to my main monitor tomorrow to see how it compares (1280x1024 atm)

 

[SciDoctor]

Looking closely at your screen cap for XBMC I see droped frames total at 16,662 which is way to high, are you getting 50fps and all those droped frames which is odd.

Anyway attached my test pc to the 1920x1200 monitor and had the same reults as with MP; XBMC gave its best at desktop resolutions of 1366x768 and below, above this and it droped frames, with the AMD/ATI HD4200

I found the deinterlacing settings in XBMC so, they were off by default, now 'on' and I get similar fps as yours with an increase in cpu usage, no forced progressive.

Your GPU is similar to mine so try a lower desktop res, it is a the bottleneck for performance.

 

[Revolty]

It's normaly zero, i loose picture when i browse settings, I did this before I took the SS, belive me it's smooth like butter in 50 fps while watching. I gain 1 or 2 fps by lowering resulotion in MP. It's allso smooth in linux at 1920x1080 using VLC or MythTV. This problem only occurs in MP. Monitoring CPU & GPU they are barly used at all in XBMC so it can't be hardware limitations.

I get the same smooth result in MP using 16bit color, CPU & GPU usage is then close to zero. I think it's some issue with windows 7 & MP while alpha channel is used,. I can't use 24bit so can't be sure tho.

Edit:

VRM9 does 50fps with no drop in MP. Can't use it tho becouse of menu flicker etc.

 

[SciDoctor]

Having used XBMC some more it is clear its GUI is less of a strain on the system than MP 1.2.x (MP 1.3.x improves matters).

Using 16bit will dissable AERO and its associated GPU acceleration and VSYNC (for good or bad).

From my point of view I can't exactly match codecs between MP and XBMC; on the low powered system in MP LAV is fine for all HD and SD non broadcast files.
There is however an oddity/problem with LAV audio and broadcast SD and HD UK DVB T/T2 (my main more powerful system doesn't experience the 100%cpu ) that causes 100% cpu usage and severe dropped frames.
In this case I use MS audio codec instead which brings the cpu usage down 60% no dropped frame for SD and (as of todays testing) DIVX AAC codec for HD with similar drop in cpu usage and droped frames.

On balance MP 1.3.x and XBMC 11.0 are faily level in performance gpu/cpu except for above oddity where the XBMC HD performance is better (though PQ seems less good) on this low powered test system.