Hi Nicolas, Thanks a lot for the hint, that allows me to make great progress. Using an overlay I'm indeed able to extract the subtitles I use : ffmpeg -f dvdvideo -title 1 -i dvd.iso -copyts -f lavfi -i color=size=pal:rate=25:color=black@0.0,format=rgba -filter_complex "[0:i:0x20][1:v]overlay[v]" -map "[v]" -f image2 -frame_pts true -c:s png title_01_fre_32_%d.png
I put the subtitle stream first so that the length of the "video" is driven by it, and I overlay a black transparent video. I end up having thousands of images (25 per second, of course) but they are all repetitions and only changing when the subtitle changes. So I wonder now how to only have as many images as there are different subtitles. Should I try a decimation ? This seems a lot of processing... All the best Thomas Le dim. 21 juil. 2024 à 13:57, Nicolas George <geo...@nsup.org> a écrit : > Thomas Ledoux (12024-07-21): > > Indeed, PNG is not supposed to be used for subtitles. But in this case, > > subtitles are images > > > > so they could be transform in PNG. Am I forgetting a filter to make it > > react as if it was a video ? > > You need to overlay the subtitles on a dummy video. > > Regards, > > -- > Nicolas George > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
