CODEWITHSUNDEEP
imagevideoffmpegvideo-processingimage-manipulation
nkkollaw
nkkollaw

Reputation: 2040

Use palette when using FFMpeg overlay

I'm trying to add an overlay to an animated GIF with FFMpeg.

It works, but the quality is pretty dismal. Basically, I'm unable to use the palette that I generate, and that leads to a lot of dither. The main GIF (meaning, not the overlay) is also very low resolution.

I would also like to apply opacity to the watermark (and at one point that worked, too), but that's a plus.

This is what I have:

ffmpeg -v error -i image.gif -vf 'palettegen' palette.png -y;
ffmpeg -v error -i image.gif -i watermark.gif -i palette.png -filter_complex '[1:v]scale=80:30, [0:v]overlay=(main_w-overlay_w) - main_h/30:(main_h-overlay_h) - main_h/30, paletteuse' -an image-watermark.gif -y

At one point I was able to use the palette for the main GIF, so its quality improved. However, the watermark looked pretty bad. It's pretty obvious that I have to do the overlay, and then the palette, so that the palette include the colors present in the watermark. However, I have no idea how to do that.

Can someone point me in the right direction?

Upvotes: 0

Views: 1272

Answers (1)

Gyan
Gyan

Reputation: 93018

You have to generate the palette for the same visual content that you wish to encode to GIF.

ffmpeg -v error -i image.gif -i watermark.gif -filter_complex  '[1:v]scale=80:30[wm];[0:v][wm]overlay=(main_w-overlay_w) - main_h/30:(main_h-overlay_h) - main_h/30, palettegen' palette.png -y;

ffmpeg -v error -i image.gif -i watermark.gif -i palette.png -filter_complex '[1:v]scale=80:30[wm];[0:v][wm]overlay=(main_w-overlay_w) - main_h/30:(main_h-overlay_h) - main_h/30[vid];[vid][2]paletteuse' -an image-watermark.gif -y

(I've kept your existing syntax, although it's preferable to label all input and output pads and not rely on automatic input pickup.)

Upvotes: 1

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