[FFmpeg-devel] [PATCH 5/5] libavcodec/ffv1: Support storing LSB raw

[Jerome Martinez]

Le 16/10/2024 à 21:51, Michael Niedermayer a écrit :
> did you try qtable 1 ? strangely it performed better for the file i used compression wise

Updated with latest code (in practice, no change in previous values):
0,037x    0,471    No patch
0,051x    0,491    bitfield
0,046x    0,489    rangecoder
0,046x    0,486    rangecoder qtable=1

qtable=1 helps but still not enough for being interesting compared to 
the bitfield version.

> also i cleaned the code up a bit and reposted, some of the code was
> not exactly optimized
>
> here the old "bitfield"
> real	0m5.545s
> real	0m5.655s
> real	0m5.643s
>
> vs. just now posted:
> real	0m5.407s
> real	0m5.393s
> real	0m5.404s

Even more interesting to keep the bitfield version rather than the range 
coder!

FYI I test on 2 different sets of 2 seconds of real content, on SSD, 1 
min of encoding each so result is stable, unfortunately I don't have 
more content but I try to have more.