[FFmpeg-user] Bit Depth of PNG Overlay with Alpha channel
Paul B Mahol
onemda at gmail.com
Sun Nov 26 19:19:00 EET 2017
On 11/26/17, Flatgrey <pete at flatgrey.com> wrote:
> 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?
png supports 8 bit depth or 16 bit depth per pixel component.
If you want more than 8 bit depth use maskedmerge filter to overlay
with 16 bit depth.
And I think you want unpremultiply filter, as currently overlay filter
only knows about straight.
> 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
>> ffmpeg -I TEST-1.mxf -i test-1.png -filter_complex
>> 'premultiply=inplace=1[img];[img]overlay' -c:v libx264 -profile
>> high10 -map '[out]' out2.mp4
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