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

Pete Willis pete.willis at support-partners.com
Fri Nov 24 00:48:48 EET 2017

We have a transparent PNG file with a drop shadow. The drop shadow when overlayed onto a Mov is rendering very dark.

Comparing the same file in an NLE (Premiere Pro) the drop shadow opacity is showing as much lighter.

I believe the problem is that the NLE is using 32bit colour depth where as FFMPEG is using 8bit colour depth. Is there a way to specify the colour depth of the overlay or the png?

The param we are using is -filter_complex 'overlay'

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