Convert animated images to videos

[zachleat]

Format filtering suggested in #260 but it’d be even better if we could add a video output format for animated image input (convert gif input to mp4 output!)

[zachleat]

This is outside the realm of sharp so it will largely need a good dependency to help here.

[khalidabuhakmeh]

This is probably what you need. https://www.npmjs.com/package/fluent-ffmpeg

An equivalent command to convert a GIF to an MP4 might be the following:

ffmpeg -i input_gif -movflags faststart -c:v libx264 -pix_fmt yuv420p output_mp4