Just wanted to clarify that this feature is not just academic but something that is quite important for broadcasters where we often receive/send content of mixed alpha type.
Users often don't know the difference between the alpha type and send material in whatever mode their editing software happens to use. During playout premultiplied alpha has become much more common. Especially since often output from e.g. Chrome is used during composition (which is premultiplied) and newer video switchers seem to move towards premultiplied. While more traditional workflows use straight alpha. Hence we often end up with a mix we need to somehow handle. In our use case we try to guess the alpha mode with the "colordetect" filter and/or let the users explicitly set the alpha mode and then we forward that using setparams. Without this feature it is difficult and/or inefficient to get composition using e.g. vf_overlay or vf_libplacebo working well. -- Robert _______________________________________________ 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".