Decode animated avif into frames

[avidseeker]

This doesn't work

$ avifdec "$f" out.png

[maryla-uc]

Hi,
Currently avifdec doesn't support outputting all frames at once, but you can use the --index flag to specify the frame number that you want. You can use avifdec -i "$f" to print the information about the animation including the number of frames.

Something like this should work:

num_frames=$(avifdec -i "$f" | grep -Eo '[0-9]+ frames' | cut -d' ' -f1)
for i in $(seq -f "%03g" 0 $((num_frames-1))); do
  avifdec --index $i "$f" out-$i.png
done

[avidseeker]

Thank you. This works for my simple use case.

It'd still be great if this is supported natively since there could be cases with duplicated frames. ffmpeg fixes this with a -vsync flag but unfortunately avif decoding support is still lacking.

$ ffmpeg -i "$1" -vsync 0 frame_%03d.png

[wantehchang]

I agree that this would be a good feature request for avifdec.

[maryla-uc]

FYI I haven't uploaded it yet but I've started a PR to address this.