DGIndexNV - block artifacts in DVB-S2 H.264-stream

[illCP]

Hello,

I'm pretty sure this is not concerning DGIndexNV directly (more to that below), but as it bothers me the most here:


I'm experiencing block artifacts in a h.264-TS when decoding it with DGIndexNV 2044. It's a DVB-recording from BBC HD (Astra 28.2E) a couple of months ago, recorded with yaVDR 0.4. I've uploaded a small sample containing the affected position (cut from the original VDR-TS with TSDoctor):

http://www.mediafire.com/?rb59vbubam4an44

The problem appears from frame 114 to 121, mainly in the left bottom corner - see attached screenshot. I admit it's not a huge disaster because it's barely noticeable, but it points to a decoder problem.

At first I assumed it might plain and simple be an error in the stream, caused by bad satellite reception, the VDR itself or whatever, but I wondered why TSDoctor didn't report an error or a warning. Then I noticed some DirectX-filters/-decoders are showing the scene without any error. I did further checking on that and discovered the following pattern:


OK, no artifacts:

- MainConcept 8.5.0.53.657 on MPC-HC 1.5.1.2903
- LAV filters 0.56, CUVID disabled on MPC-HC
- CoreAVC 3.0.1, CUDA disabled on MPC-HC
- VLC 2.0.5 (as far as I know VLC uses its own decoders and no DirectShow-filters?)


Error, artifacts:

- DGIndexNV 2044
- LAV filters 0.56, CUVID enabled on MPC-HC
- CoreAVC 3.0.1, CUDA enabled on MPC-HC


So it seems the problem appears whenever CUDA is involved, software-based decoding seems to be fine. My problem here: As a matter of principle DGIndexNV is not designed to turn off CUDA...


My System:

Windows 7 x64
nVidia GTX 550 Ti (two of them to be precise) with driver version 314.22 (just updated yesterday to be on the safe side)


Any ideas?