MKV h.264 Hardware Acceleration DXVA

[vlad]

Originally Posted by Severus606

OK, I looked, but there's no info on which x264 codec you use, which splitter, the bitrate of the MKVs, etc. Would be good to know if there is a workable solution available now. Just asking as I have Futurama encoded in 320x240 MKVs and could probably get 2% CPU decoding them on a PIII, but 1080p 40Mbps MKVs are another story

CCCP, 1080p 40Mbps mkv's

[Severus606]

That can't be quite right, CCCP uses ffdshow which doesn't support DxVA (as its basically just a wrapper for a ffmpeg). And your CPU can't decode 40Mbps x264 at 2% CPU.

Wonder if some quirk in your config has resulted in DxVA offload via some other codec? Would be interesting to see your codec graphs.

[vlad]

Was about 40% before, but after video card upgrade and CPU upgrade it is low as I say
Palit 9600 GT, 6600 quad core. 9600 has native h.264 decoding.

[Severus606]

Originally Posted by vlad

h.264 decoding.

Yes (and so does everything from the 7xxx series up), but only via DxVA, and CCCP/ffdshow doesn't leverage DxVA. So its either being decoded on your CPU, which doesn't seme possible at that resolution and bitrate with that CPU, or somehow DxVA is being invoked, in which case it'd be interesting to find out what the solution is as then the original poster could use it to resolve his problem.

[kiffies]

Amen to that

My GFX card is a 2600XT which is supposed to have onboard H264 decoding. I read last night on a forum that if I rename the files to .avi or .mp4 then powerdvd would be able to accelerate them properly, however I tried this and it didn't seem to help either.

[linzki]

I had same problem that this threads starter has. Problem was with subtitles, namely .sub subtitles.

I used subtitle workshop to open that .sub file and saved it as subrip file (.srt) now it takes only about 50% of my cpu time and video and sound works perfectly.

i've tried about every codec that there is and it didn't help, just this little tweak with subtitles worked. I think this works with every mkv codec (haali, or core av...)

[kiffies]

Thanks for the promising repsonse;

Does this apply even with an MKV without subtitles? Most of them don't have subtitles and the ones that do, I normally right click vobsub in the system tray and exit it, but I don't think it makes any difference

[linzki]

Another easy one worth to try is, if u use kmplayer: start video and press alt+F for super speed mode or ctrl+alt+F for high speed mode



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[krypto]

Despite numerous searches I haven't found a way to easily turn off mkv sub titles. Is there a way to disable them by default?

From this thread and other reading I also take it that at the moment there is no way to offload h264 to dxva. Bummer, seems like a bit of a waste with my 3850.

Vlad, I'm sure in another thread you said you don't use or recommend codec packs. Isn't that what CCCP is?

[krypto]

This thread provides a lot of info on the mkv dvxa problem and some simple solutions