[FFmpeg-user] libvpx and libx264 problematic frame accuracy
Carl Eugen Hoyos
cehoyos at ag.or.at
Sun Jan 20 03:02:05 CET 2013
Franz Klinger <klingerfranz827 <at> gmail.com> writes:
> ffmpeg.exe -i akiyo-352x288-29.970.avi -c:v libvpx
> -quality good -speed 0 -vb 300k -y
> akiyo-vp8-none-352x288-29.970-good-cbr-300.webm
>
> I get a file with which I can't properly measure
> psnr or ssim. It seems that when using e.g. msu
> video quality measurment tool (which seem to use
> DirectShowSource2 for webm files) the frames are
> shifted.
I may misunderstand but the output you posted
indicates that frames are neither dropped nor
duplicated so "shifting" seems unlikely.
Did you test by encoding both the original
and the encoded video to images and compare
them?
Carl Eugen
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