>Nicolas George <george <at> nsup.org> writes: > >> Le quintidi 25 messidor, an CCXXIII, Carl Eugen Hoyos a écrit : >> > I can confirm that there may be an issue >> > but it is not overlay-related: >> > $ ffmpeg -i input -vf >> > "split[x][z];[x]format=gray[x1];[x1]nullsink" >> > -strict -2 -vcodec jpeg2000 -ss 1 out1.avi >> > >> > $ ffmpeg -ss 1 -i input -vf >> > "split[x][z];[x]format=gray[x1];[x1]nullsink" >> > -strict -2 -vcodec jpeg2000 out2.avi >> >> If the issue is that the output is converted to >> gray too, then this is the expected behaviour. > >In the first case (without "seeking") one "stream" >(this is not the right term I fear) is converted >the other one is left unchanged. >In the second case (with seeking) both streams >are converted to gray. > >While I understand that the filterchain may not >be unambiguous, it looks identical in both cases. > >Note that the following command produces gray >output in yuv420p, it appears that two scale >filters instead of the optimal one filter is >inserted: >$ ffmpeg -ss 1 -i input -vf >"split[x][z];[x]format=gray[x1];[z]format=yuv420p;[x1]nullsink" >-strict -2 -vcodec jpeg2000 out2.avi > >> For the rare cases where it does matter, for >> example to be sure to deinterlace before >> converting, you need to insert the scale filter >> explicitly at the point you want the format >> conversion. > >Which is in front of the format filter iiuc. > >> In this particular case, my guess is that >> libavfilter decided to insert the scale filter >> before split. Insert explicitly after split >> and it should work as expected. > >It does, yes.
Thank you for the explanation, Carl Eugen and Thank you for the additional explanation, Nicolas George ----- https://twitter.com/nico_lab http://nico-lab.net/ -- View this message in context: http://ffmpeg-users.933282.n4.nabble.com/Apply-format-with-overlay-and-ss-in-front-of-inputfile-is-strange-tp4671394p4671432.html Sent from the FFmpeg-users mailing list archive at Nabble.com. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
