Sorry my poor english. > The "format" of the output of the overlay filter > is yuva420p. This is not supported by x264, so > the output "format" file-wise is yuv420p. > The output is visually gray because you > overlayed a gray frame (x1) over another > frame (of the same size).
Yes. This is right. I want to know is why -ss <seconds> in front of input file applies overlayed is visually gray? Another command samples, and same ffmpeg. ffmpeg -f lavfi -i rgbtestsrc=d=10,format=yuv420p -vcodec libx264 rgbtestsrc.mp4 This is visually rgb color[z] overlayed video. ffmpeg -i rgbtestsrc.mp4 -vf split[x][z];[x]format=gray[x1];[x1][z]overlay -vcodec libx264 10.mp4 This is visually rgb color[z] overlayed video. ffmpeg -i rgbtestsrc.mp4 -ss 1 -vf split[x][z];[x]format=gray[x1];[x1][z]overlay -vcodec libx264 11.mp4 This is visually rgb color[z] overlayed video, but output file is visually gray. ffmpeg -ss 1 -i rgbtestsrc.mp4 -vf split[x][z];[x]format=gray[x1];[x1][z]overlay -vcodec libx264 12.mp4 ----- 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-tp4671394p4671414.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
