On date Tuesday 2023-05-02 23:30:41 +0300, Сергей Солтанов wrote: > Hi!
> I googled tonnes of information about how to forward data from one filter > to another, but nothing possible. The only way is to send some current > frame data as a command with sendcmd filter, but most of it accessible by > filters themselves. > Most of interesting data prepared by some analysing filters like > cropdetect, signalstats etc. and saved in frame metadata. > It could be a good idea to send it somehow to next filters in filtergraph. > > So I added a small code to sendcmd filter, so it can evaluate function > meta(key) in its commands when [expr] flag is used, e.g.: > ------------------- > ffmpeg ... -vf cropdetect=reset=1,\ > sendcmd=c='0 [expr] crop x 10+meta(lavfi.cropdetect.x),\ > [expr] crop y meta(lavfi.cropdetect.y)+meta(lavfi.cropdetect.h)/2,\ > [expr] crop w meta(lavfi.cropdetect.w)-10\ > [expr] crop h 0.5*meta(lavfi.cropdetect.h)'\ > ,crop > ------------------- > > I don't know how to use git here, so just cloned last version (v5.1) and > edited f_sendcmd.c. > If my contribution is interesting, I'll try to upload it into repository, > but I need some help, or maybe someone will do it? > > Please, find updated file in attachment. It's easier to review this if you send a patch: https://ffmpeg.org/git-howto.html#Basics-Usage This is the process: git clone https://git.ffmpeg.org/ffmpeg.git cd ffmpeg # edit edit edit test edit git diff git commit -a git format-patch HEAD~1 Then you send the generated patch as an attachment to your reply. We also need documentation changes (in doc/filters.texi) to provide context and examples for the feature. Thanks. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".