On 10/7/17, Ronald S. Bultje <rsbul...@gmail.com> wrote: > Hi, > > On Sat, Oct 7, 2017 at 6:25 AM, Michael Niedermayer <mich...@niedermayer.cc> > wrote: > >> On Sat, Oct 07, 2017 at 12:12:15PM +0200, Michael Niedermayer wrote: >> > > >>>>> On Fri, Oct 06, 2017 at 10:03:16AM -0400, Ronald S. Bultje >> > > >>>>> wrote: >> > > >>>>>> I'm open to any alternative method you suggest. >> > [..] > >> > About a solution, I didnt write alot about solutions as iam really fine >> > with any solution. There are many possible solutions ... >> > The libavfilter/af_astats.c filter i mentioned outputs statistics >> > via metadata >> > [..] > >> > There are other possibilities. Also Hendriks suggestion about >> > turning metadata via some other application option into a file sounds >> > pretty good to me >> > > psnr/ssim/vmafmotion indeed use per-frame metadata, but that unfortunately > doesn't address the use case of using ffmpeg to quickly dump some per-frame > stats to a file (or stdout) for quick comparison/verification (e.g. compare > against Netflix' vmaf code reference scores) since we don't print frame > metadata anywhere. > > If someone does what Hendrik suggests (turning metadata into a file or into > a log) then indeed there is no problem.
There is (a)metadata filter. > > >> > or av_log as 2 alternatives to direct file write. >> > > av_log would be simpler, yes. > > yet another solution (if people dislike all suggestions so far) would >> be adding a flag to filters which are safe to use with untrusted >> parameters. Or a flag to options which are unsafe so they are blocked >> from being set from an untrusted input string >> > > I actually considered this myself, but didn't want to propose it because I > personally thought it was a little hacky... I'm not against it, though. > > Of these, I probably like the first one best (having some way of writing > per-frame metadata generically to stdout or to a file, without explicit > options), but it may also be the most complex one. Any takers to implement > this? > > Ronald > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
