WebCodecs Bugs

This page is a list of known WebCodecs issues in browsers that our community has filed. It serves as a tracker for overall progress and known issues.

Issue	Product	Filed by	Fixed?
AudioData.copyTo with interleaved f32 handles frameOffset incorrectly	Firefox	@JonnyBurger	No
H.264 packet with "Unspecified" NALU (24..31) trips up key frame validation, erroring VideoDecoder	Chrome	@Vanilagy	Yes
H.264 VideoDecoder key frame detection fails for packets with an AUD not at the start	Chrome	@Vanilagy	No
YUV VideoFrame draws onto a canvas are 5-10x slower when resized	Chrome	@Vanilagy	Yes
AAC AudioEncoder produces incorrect decoder config description	Safari	@Vanilagy	No
AudioData.copyTo() crashes the tab with valid conversion	Safari	@JonnyBurger	Yes
AudioEncoder emits humorous AAC bitrate suggestions in error message	Chrome	@Vanilagy	Yes
VideoEncoder encodeQueueSize behaves unpredictably after calling encode()	Chrome	@Vanilagy	Won't fix
AudioEncoder queue size not accurately reflected by encodeQueueSize	Chrome	@Vanilagy	Yes
WebCodecs VideoDecoder Outputs Frames in Incorrect Order	Safari	Jozef Chúťka	Yes
HDR HEVC VideoFrame draws onto a canvas as fully transparent (regression)	Chrome	@Vanilagy	Yes
VideoDecoder HEVC key frame detection is too strict; rejects packets that Chromium decodes just fine	Chrome	@Vanilagy	Yes
VideoDecoder fails on interlaced content when routed to hardware decoder	Chrome	@Vanilagy	Yes
VideoEncoder with VP8/VP9 fails with zero-duration VideoFrame	Chrome	@Vanilagy	Yes
VideoDecoder key frame detection too strict, rejects non-IDR AVC key frames, causing decoder error	Chrome	@Vanilagy	No
VideoEncoder performance drastically degrades if the page needs to rerender	Chrome	@Vanilagy	No
AudioDecoder.isConfigSupported() returns false positive	Chrome	@JonnyBurger	Yes
AudioDecoder doesn't respect chunks with negative timestamps, starts AudioData timestamps at 0	Chrome	@Vanilagy	No
HEVC VideoEncoder on AMD hardware on Windows labels first emitted chunk as "delta"	Chrome	@Vanilagy	No