Cause of video artifact/artefact

Question

![alt text][1]

The above screenshot shows some artifacting which is occuring during a software decode of a .DV video file, compliant to SMPTE 314m...

The artefacting is believed to be cause by a AC/DC coefficient problem, is this likely?

Any information is appreciated.

Answer 1

I'm not sure what the issue is. The blockiness would seem to indicate you are decoding the AC coefficients incorrectly. The good news is that it appears every macro block is being decoded incorrectly. If nothing else, they are too dark. Thus I would step through the decoding of a single block. Do the math by hand and then watch it decode in the debugger. See where the numbers diverge.

Answer 2

Looks to me like you might not be decoding the frame compression correctly...

-Adam