Let's assume A is a video, and B is a png image with alpha channel. I need to do the following blending (assuming the format is rgba and B_alpha is in 0...1 range):
red = (A_red - B_red * B_alpha) / (1 - B_alpha); green = (A_green - B_green * B_alpha) / (1 - B_alpha); blue = (A_blue - B_blue * B_alpha) / (1 - B_alpha); I was looking into "blend" filter, but it seems I can't access the other channels data. The "geq" filter is limited to a single source. What shall I use it that case? I really hate the idea of digging into ffmpeg sources and writing my own filter. Is there any chance to do this kind of blending without that? _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
