ffdshow reduces fps to 24/25 (as opposed to 50fps without) (1 Viewer)

[revs]

TV-Server Version: 0.3 SVN
MediaPortal Version: 0.2RC2
MediaPortal Skin: ReVision
Windows Version: XP SP2
CPU Type: AMD X2 3800+
HDD:
Memory: 1GB
Motherboard: Gigabyte GA-K8N-Ultra 9
Motherboard Chipset:
Motherboard Bios:
Video Card: Gigabyte 6600GT Passive
Video Card Driver:
Sound Card:
Sound Card AC3: Coaxial Out
Sound Card Driver:
1. TV Card: Hauppage Nova-T
1. TV Card Type: DVB-T
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: ffdshow/purevideo
MPEG2 Audio Codec: ffdshow/purevideo
Satelite/CableTV Provider:
HTPC Case: Antec Mid-Tower
Cooling: Artic Cooling fan on CPU, Seasonic PSU with 120mm fan
Power Supply: Seasonic
Remote: MCE
TV: Samsung 40" M87
TV - HTPC Connection: DVI --> HDMI

Hello!

So, been trying to improve my MP experience, during which ive noticed and issue with FPS.

When using the PowerDVD/Nvidia codec I get 50fps. Once I attach ffdshow, this drops to 24/25fps. it will never go above this.
It is not a CPU issue, as there is plenty of headroom. It seems to be a ffdshow specific thing.

Anyone else get this? any ideas? With TV broadcast at 30fps in the UK its quite noticable that things are exactly perfect

 

[and-81]

Sounds like ffdshow is deinterlacing the 50 interlaced fields to 25 progressive frames ... The deinterlacing setting can probably be changed to make 50 half-height progressive frames ...

Try playing with the deinterlacing if you're not happy with the PQ.

Hope that helps,

 

[revs]

Hmm maybe that makes sense.

I have PowerDVD dong the de-interlacing and passing the video to ffdshow for post processing, so I guess PowerDVD is doing the 50frames de-interlaced to 25.

Doesnt really make sense with 30fps TV though.. i'll double check though.

EDIT: I can take PowerDVD out of the equation and see what happens with just ffdshow - id hope to see 50fps.

 

[igalan]

I'm using ffdshow and it outputs at 50 fps. You have to enable deinterlacing in ffdshow, as well as in Media Portal. Use Kernel Bob and that's it.

 

[Spragleknas]

You mean enable deinterlacing in MyTV? If so: What mode? (Bob, weave, best?).

I've been uysing FFMPEG deinterlacing in FFDShow, but not quite happy with the results. Are you using any spesific settings for Kernel Bob? (Treshold = ?, sharp, luma etc.)

 

[igalan]

Yes, set deinterlacing under MyTV to Bob, then configure ffdshow to deinterlace using Kernel Bob. That will split each interlaced frame in two frames which will be upscaled to full screen. I have not changed the settings of Kernel Bob in ffdshow, the default ones work pertty well here.