[FFmpeg-user] Problem with ffmpeg psnr calculate filter when image file applied

[肖谋]

I tried. It works. Thanks,all


On Thu, Dec 19, 2013 at 6:13 PM, Paul B Mahol <onemda at gmail.com> wrote:

> On 12/18/13, Stefano Sabatini <stefasab at gmail.com> wrote:
> > On date Tuesday 2013-12-17 22:35:55 +0800, ****** wrote:
> >> Dear all,
> >>    I would like to calculate the PSNR of two images or two videos. I
> found
> >> that the new psnr filter worked well for video files which have at less
> >> two
> >> frames, but not for one frame, or image files.
> >>
> >> ffmpeg version is 2.0.2
> >> generate the files to be compared
> >> two frames video: ./ffmpeg -i test.mkv -vframes 2 -vcodec libx264 -an
> >> frame2.mkv
> >> one frames video: ./ffmpeg -i test.mkv -vframes 1 -vcodec libx264 -an
> >> frame1.mkv
> >>
> >> this one does not work:
> >> ./ffmpeg -i test.mkv -vframes 1 -vcodec rawvideo -filter:v
> >> "movie=frame1.mkv,setpts=PTS-STARTPTS[main];[in][main]psnr=f=c.log" -f
> >> rawvideo -y /dev/null
> >>
> >> this one works:
> >> ./ffmpeg -i test.mkv -vframes 1 -vcodec rawvideo -filter:v
> >> "movie=frame2.mkv,setpts=PTS-STARTPTS[main];[in][main]psnr=f=c.log" -f
> >> rawvideo -y /dev/null
> >>
> >> This situation can also be reproduced using image files.
> >> I looked into the vf_psnr.c. The do_psnr is not called.
> >>
> >> I think this might be a bug for filter process? any suggestions to fix
> >> this?
> >
> > Are you able to reproduce the problem with latest git (2.0.2 is a bit
> > old and we had some fixes which may be relevant).
> >
> > Also you could file a bug report.
>
> Yes this bug was fixed by Nicolas work.
>
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> >
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