[Shine]

The problem is likely on ffmpeg side, see ffmpeg ticket #604. So there's no easy fix for it on XBMC side. At the point where XBMC decides whether to use DXVA or not (CDVDVideoCodecFFmpeg::GetFormat), the ffmpeg context is already set up, so changing thread count (to 1) or threading mode (to slice) won't have any effect anymore.

Other sources I found suggest that the issue indeed occurs only in frame threading mode, not slice threading mode. So a0fc63d should fix it for all sources, even sliced ones - unfortunately with the downside of completely disabling mt decoding for non-sliced sources.

At this point, unless problem is solved by a patch, the only solution i see is something in the video options, asking if you want mt software or dvxa.

That'd be easy to do (ie. force thread mode to slice if DXVA is enabled in the video options), but not intuitive at all for the end user. And since XBMC is in pre-alpha phase now, not even nightly builds available, there's no need for such an ugly hack. If you're masochistic enough to use pre-alpha builds from shady sources , just install the build you want (with or without a0fc63d) and done.