On 4 September 2010 06:02, Vitor Sessak <[email protected]> wrote: > On 09/03/2010 11:50 PM, Marcelo Galvão Póvoa wrote: >> >> Also, whether with this patch or not I guess my output to the first >> sample above (attached) is not good compared to the reference decoder. >> The are some sharp peaks that can be seen with Audacity, one of them >> also with clipping. The stddev I've got seems ugly: >> stddev: 884.86 PSNR: 37.39 MAXDIFF:23298 bytes: 473600/ 473600 >> > > Indeed, the stddev is not particularly good, but don't trust only it to do > comparisons. A very small phase shift can completely ruin the stddev. > > Do you see sharp peaks in your output that are not there in the reference > decoder? Or the sharp peaks shows up when you invert and superpose the > waves? Do these sharp peaks gives audible artifacts? >
Sorry, I've forgot to mention that I was comparing the reference decoder output waveform with mine. In general, they look mostly the same but there are some 3 or 4 points in which my decoder gives a short peak. I couldn't notice audible artifacts at these moments. >> Inverting one of the waves and playing them simultaneously I can hear >> some intermittent artifacts, so I guess there is still something wrong >> with the decoder. >> > > This is also something that is very sensible to a tiny phase difference... > It's good to know. -- Marcelo _______________________________________________ FFmpeg-soc mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-soc
