[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 

Carl Eugen

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