Yes — the resize option scales the MKV down before frame extraction, which dramatically shrinks WebP file size. A 480p WebP from a 4K MKV is roughly 16x smaller than a 4K WebP. Use /video-cutter/ for cropping in a separate step.
Animated WebP encoding is CPU-bound and slower than typical video re-encode — expect roughly 1x source duration. A 10-second MKV → WebP finishes in about 10 seconds; a 30-second clip in about 30. GIF is slightly slower than animated WebP due to palette computation.
Does the WebP animation preserve transparency from the MKV?