[FFmpeg-user] Bit Depth of PNG Overlay with Alpha channel

[Gyan Doshi]

On 11/25/2017 3:20 PM, Pete Willis wrote:
> We have a transparent PNG file with a drop shadow. The drop shadow when overlayed onto a Mov is rendering very dark.

This is usually related to whether the input color pixels are straight 
or pre-multiplied.

Try

     ffmpeg -I TEST-1.mxf -i test-1.png -filter_complex 
'[1]premultiply=inplace=1[img];[0][img]overlay' -c:v libx264  -profile 
high10 -map '[out]' out2.mp4


Regards,
Gyan