[FFmpeg-user] PSNR per frame

[Stani S.]

Hi, 

I was wondering if is there a way to obtain the PSNR for each frame encoded
with x264. The --psnr option in ffmpeg should write psnr for each frame in
vstat file, but instead I'm getting INF value for each frame's psnr. How at
the end of encoding the ffmpeg calculates the average psnr? 
Thanks!

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