[FFmpeg-user] How can I convert rbg to yuv420p loseless?

[bert1974]

PIX_FMT_BGRA contains alpha(=transparency) information.. to get the
transparent edges right, you will have to blend/draw on a background color
when converting from bgra to rgb. don't know how to do with SwsContext,
maybe convert/blend rgba->rgb manual, than convert rgb to yuv using
SwsContext

(it looks like the image in your mail is blended on black instead of white)



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