2018-01-11 4:52 GMT+01:00 Jim DeLaHunt <[email protected]>: > On 2018-01-07 21:29, Jim DeLaHunt wrote: >> >> Hello, ffmpeg'rs: >> >> I'm trying to overlay animated GIFS onto one white background, with some >> text at the top. I'm looking for an incantation which a) does the job and >> b) leaves all the colours of the animated gifs unchanged. >> >> What options tell ffmpeg not to mess with the colour values, not to change >> colour spaces, not to reduce precision of colour coordinate values? > > > The best answer to this appeared in an answer to SuperUser question, > /Lossless universal video format /[1] > <https://superuser.com/questions/486325/lossless-universal-video-format>.
Because of its age, this "answer" is not only outdated but in your context simply wrong. > Preserve colour space? Sorry, none. The Animated GIF colour values are > defined as 24-bit RGB values in sRGB space. As far as I can tell it's hard > to get FFmpeg to use RGB for its operations, it really pushes you to YUV > (luminance and two chroma values). This is - in the context you provide - not true, the overlay filter supports rgb which should visually improve the quality of your output video. The better choice for a lossless video is typically ffv1. Carl Eugen _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
