2017-09-28 11:14 GMT+02:00 Tom Butterworth <bangno...@gmail.com>: > On Wed, 27 Sep 2017 at 16:52 Carl Eugen Hoyos <ceffm...@gmail.com> wrote:
>> As long as FFmpeg does not have a native alpha-only >> pix_fmt (I am not sure this would have any user-visible >> advantage), single-layer 8bit formats should be decoded >> as gray8. > > This would result in a transcode to another alpha-carrying codec > incorrectly placing the alpha channel in the colour channels, and > setting the alpha channel to solid. Likewise, API users would not > be able to know the channel intentions of the decoded frame. I'd > argue that either a new pixel format be added, or an existing > format which carries alpha should be used, even if that has the > cost of redundant colour channels. Allow me to repeat my question: How would the workflow look like that is easier if we use RGBA instead of gray? Carl Eugen _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
