Am 19.04.19 um 14:35 schrieb Paul B Mahol: >>> You do not need to use loop filter on single png. >> I need real pictures to prove the correctness of my hacking. The >> smptebars is not appopriate to see errors in the output e.g. from mirroring. >> >>> Use something like this: >>> >>> ffmpeg -f lavfi -i smptebars=size=hd720 -vf fillborders=... -f null - >> For performance testing I use the like: >> -f rawvideo -pix_fmt gray16 -s 400x600 -i /dev/zero >> >> Are there doubts if that is good either? > Use ffmpeg -f lavfi -i color=color=black:size=400x600 ... > > Thing about /dev/zero and -f rawvideo is that it will decode zeroes > over and over again and thus use more CPU for that.
I can not confirm that. :-( My benchmark needs 60 seconds with ffmpeg -f lavfi -i color=color=black:size=400x600,format=rgba64/gray/gray16 ... but only 25 seconds with ffmpeg -f rawvideo -pix_fmt rgba64/gray/gray16 -s 400x600 -i /dev/zero ... -Ult _______________________________________________ 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".
