[FFmpeg-devel] [PATCH] NVENC: Better surface allocation alghoritm, fix rc_lookahead

Miroslav Slugeň thunder.m at email.cz
Mon Nov 21 13:17:43 EET 2016

User selectable surfaces are not working correctly, if you set number of 
surfaces on cmdline, it will always use minimum 32 or 48 depends on 
selected resolution, but in nvenc it is not necessary to use so many 

So from now you can define as low as 1 surface and nvenc will still 
work, it will ofcourse lower GPU memory usage by 95% and async_delay to zero

That was the easy part, now littlebit more...

Next part of this patch is to always prefer rc_lookahead to be more 
important for number of surfaces, than user defined surfaces value. 
Maximum rc_lookahead from nvidia documentation is 32, but could increase 
in future generations so there is no limit for this yet. Value 
async_depth is still accepted and prefered over rc_lookahead.

There were also bug when you request more than rc_lookahead > 31, it 
will always set maximum 31, because surface numbers recalculation was 
after setting lookahead, which is now fixed.

If you set -rc_lookahead 32 and -bf 3 it will now use only 40 surfaces 
and lower GPU memory usage by 20%, also it will now increase PSNR by 0.012dB

Two more comments:

1. from my internal test, i don't understand addition of 4 more surfaces 
when lookahead is calculated, i didn't used this and everything works as 
with those 4 more extra surfaces, does anybody know what is going on 
there? I looks like it was used for B frames which are calculated 
separately, because B frames maximum is 4.

2. rc_lookahead is defined default to -1, but in test condition if 
(ctx->rc_lookahead) which sets lookahead it will be always true, i don't 
know if this is intended behavior, so in default behavior is lookahead 
always on!

This is default condition when rc_lokkahead is -1 (not defined on 
cmdline), whis is maybe something that is not intended:
ctx->encode_config.rcParams.enableLookahead = 1;
ctx->encode_config.rcParams.lookaheadDepth  = 0;
ctx->encode_config.rcParams.disableIadapt   = 0;
ctx->encode_config.rcParams.disableBadapt   = 0;

Miroslav Slugeň

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