[FFmpeg-devel] [PATCH] swresample: add exact_rational option

[Michael Niedermayer]

On Sun, Jun 12, 2016 at 07:56:31AM +0700, Muhammad Faiz wrote:
> give high quality resampling
> as good as with linear_interp=on
> as fast as without linear_interp=on
> tested visually with ffplay
> ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000,
> showcqt=gamma=5"
> ffplay -f lavfi "aevalsrc='sin(10000*t*t)',
> aresample=osr=48000:linear_interp=on, showcqt=gamma=5"
> ffplay -f lavfi "aevalsrc='sin(10000*t*t)',
> aresample=osr=48000:exact_rational=on, showcqt=gamma=5"
> 
> slightly speed improvement
> for fair comparison with -cpuflags 0
> audio.wav is ~ 1 hour 44100 stereo 16bit wav file
> ffmpeg -i audio.wav -af aresample=osr=48000 -f null -
>         old         new
> real    13.498s     13.121s
> user    13.364s     12.987s
> sys      0.131s      0.129s
> 
> linear_interp=on
>         old         new
> real    23.035s     23.050s
> user    22.907s     22.917s
> sys      0.119s     0.125s
> 
> exact_rational=on
> real    12.418s
> user    12.298s
> sys      0.114s
> 
> possibility to decrease memory usage if soft compensation is ignored

interresting

can you add some fate tests ?
(that way this also could be easily tested for platform specific bugs)

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Never trust a computer, one day, it may think you are the virus. -- Compn
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