(2014-04-22 16:27)mr_raider Wrote: So here are the results of my testing:
1. With fglrx and VAAPI enabled:
No acceleration for mpeg2. I get acceleration for h264 and Vc-1. Other mpeg4s don't seem to accelerate. CPU useage on non accelerated stuff is minimal (under 10%).
2. With OSS driver, updated mesa from wsnipex repo, and vdpau enabled:
I need to disable mpeg2 to acceleration. H264 and VC1 seem to accelerate using vdpau. MPEG4 is hit and miss. It seems to accelerate fine, but some of my downloaded Stargate episodes play worse than unaccelerated on fglrx. Furthermore, the desktop effects are laggy with the OSS.
Considering the minimal CPU overhead on unaccelerated video, and the fact that in either case, most of my content is unaccelerated (mpeg2), I may as well stick with fglrx for stability for new.
The moral of the story is that you need to individually assess your hardware and your useage scenarios. My guess is that the RAdeon SI driver for the new GCN cards is not fully mature yet. Having an 8 core CPU means accelerating video on the GPU is not a big issues, since I can live with the overhead. If you have a low end CPU it might be more improtant to get GPU acceleration to work. My guess is that works better on VLIW4 and VLIW5 cards.
I have an older Llano APU running Quantal which needs to be upgraded. I'll give the OSS driver a try there and see what comes up. In the meantime I will follow this thread with interest. You guys are doing fantastic work. If anyone with a GCN card (radeon 7700 and up), I would be curious to read their experiences.
I'm interested in your experience, as my HTPC is A10-5700 currently on 12.04 + fglrx (hacked version from Frisch) and Frodo VAAPI from the thread in this forum.
I understand that you tested Gotham, did you try XBMC 14 Alpha?
I'm testing 14.04 + OSS on this iMac and the feeling is better than the fglrx, with all test files.
I was seriously thinking about upgrading the HTPC, but this must be a one-bullet operation, as if it doesn't work I'll get a revolution at home.