[FFmpeg-devel] [PATCH] adpcm: Store trellis nodes in a heap structure

[Reimar Döffinger]

On Thu, Nov 11, 2010 at 01:08:41AM +0200, Martin Storsj? wrote:
> > In that case, do you feel like finding some setting that with all 
> > patches is about the same speed as without patches and compare the 
> > quality? IMO that would possibly be the most interesting comparison.
> 
> If reading the graphs at 
> http://albin.abo.fi/~mstorsjo/adpcm-graphs/music1/, I find the following 
> test runs quite similar:
> Original code, -trellis 6: 26.7 seconds, stddev 87.67, PSNR 57.47
> Fully patched, -trellis 8: 22.8 seconds, stddev 85.08, PSNR 57.73
> 
> Thus, with all the patches, you get better quality at comparable run 
> times. Or just roughly similar quality at very much shorter run time. :-)

My question was rather: how does the "maximum" quality change, i.e.
at the highest reasonable setting.
I'd expect it to rather improve, but I think you so far only tested really
fast settings (22 seconds is not a long encoding time in any way,
even the original 1 minute something is still "acceptable", I remember
when MP3-encoding was done at I think 1/8th real-time...)