QVideoSink doesn't handle alpha channel

[TheEnigmist]

I've a WebM (VP9) video with alpha channel on it. I can open correctly the video on OBS and it shows as intended, but if I try to use it in QVideoSink using videoFrameChanged to show video frame by frame it shows a black background instead of transparent.

Here ffmpeg file info :

PixelFormat of each QVideoFrame is Format_BGRA8888 , when converted to QImage becomes Format_ARGB32_Premultiplied , all of them has an alpha channel so why my video show transparency as a black pixel?

EDIT: If I check alpha channel with hasAlpha() on frame.image() is true, QPixmap::fromImage(frame.image) returns false!

[SGaist]

Hi,

Please don't post the same question in multiple sub forums. One is enough.

Duplicates

Closing this one