On the current IPU video stream, I wish to overlay a picture by using local alpha blending technique.
I obtain 3 results:
(local_alpha is enabled)
1- Picture format = BGR24 bits + 8 bits separate alpha ==> Correct blending of the picture.
2- Picture format = BGRA32 bits ==> The picture doesn't appear.
3- Picture format = BGR 32 bits + 8 bits separate alpha ==> The picture is blended but colors are corrupted (i've tried severals BGR or RGB possibilities).
For the cases 2 and 3, if i switch local alpha to 0 and global alpha to 1, then i see the picture (but no more the video stream).
So, i think there's an IPU issue when 32 bits overlay signal and local alpha are used.
Someone can confirm or not ?