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

Flatgrey pete at flatgrey.com
Sun Nov 26 18:28:31 EET 2017

Thanks Gyan

That improved things slightly.  The difference is pretty noticeable though to the output I can get with Premiere. 

Do you know if you can specify the colour bit depth for the png file?



Sent from my iPhone

> On 25 Nov 2017, at 11:57, Gyan Doshi <gyandoshi at gmail.com> wrote:
>> 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
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