[fritsch]

Idct :-) if that was the only issue. It's no issue at all.

[qp9013625]

Checked it again with all background apps closed and also checked the Samsung video this time.

For the Sony video it was now:

Code:

[null @ 0xa92bc0] Encoder did not produce proper pts, making some up.
frame= 7620 fps= 54 q=-0.0 Lsize=N/A time=00:02:07.14 bitrate=N/A    
video:714kB audio:23844kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

So, a bit better this time.

For the Samsung video it was:

Code:

[null @ 0x1144460] Encoder did not produce proper pts, making some up.
frame=11678 fps= 81 q=-0.0 Lsize=N/A time=00:03:14.82 bitrate=N/A    
video:1095kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

Regardless of what these numbers say though, it certainly does not look like 54 fps when playing back the Sony video with KODI with VAAPI disabled... It stutters quite a lot...

And the Samsung video still stutters slightly, even though the benchmark says 81 fps...

[AndyFurniss]

Idct :-) if that was the only issue. It's no issue at all.

+25% :-) big gain for just one tweak - more to come maybe?

Looking again I think I was wrong about AVX2 users not gaining from this. The fact there are hevc*asm files in libavcodec/x86 made me think they must be doing something for someone, but in the case of hevc_idct.asm it seems it doesn't do a lot.

Edit: snip old link.

Add this patch and it does a lot more.

Edit : commit is in now, so new link to show the diff =

https://git.libav.org/?p=libav.git;a=com...39b046dc78

Maybe the sao, mc, deblock, res_add could be improved also. In addition h264 has intra_pred so maybe hevc could gain that (or maybe hevc intra pred is harder to simd than avc)

[AndyFurniss]

Regardless of what these numbers say though, it certainly does not look like 54 fps when playing back the Sony video with KODI with VAAPI disabled... It stutters quite a lot...

And the Samsung video still stutters slightly, even though the benchmark says 81 fps...

The trouble being not fast enough decoding with h264/hevc is that frames depend on other frames so it's hard to just skip decoding one now and again to keep sound sync.

I guess for the 81 fps one that maybe average rate is not enough to judge if you are fast enough - or it could be something else.

I know if I play something I am too slow to play using a player that doesn't drop any frames it's not at all smooth.
Some frames take more/longer to decode than others and if you are playing at 60fps some may take longer than 1/60 even if the average looks good.

Edit: Also there is the overhead of getting 60 2160p frames/sec over to the gpu which then has to convert to rgb and display in this case close to refresh rate.