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	Status
AudioData.copyTo with interleaved f32 handles frameOffset incorrectly	Firefox	@JonnyBurger	Open
H.264 packet with "Unspecified" NALU (24..31) trips up key frame validation, erroring VideoDecoder	Chrome	@Vanilagy	Fixed
H.264 VideoDecoder key frame detection fails for packets with an AUD not at the start	Chrome	@Vanilagy	Open
YUV VideoFrame draws onto a canvas are 5-10x slower when resized	Chrome	@Vanilagy	Fixed
AAC AudioEncoder produces incorrect decoder config description	Safari	@Vanilagy	Open
ArrayBuffer-backed YUV VideoFrame with visibleRect is rendered incorrectly (chroma channels are offset)	Safari	@Vanilagy	Fixed
AudioData.copyTo() crashes the tab with valid conversion	Safari	@JonnyBurger	Fixed
AudioEncoder emits humorous AAC bitrate suggestions in error message	Chrome	@Vanilagy	Fixed
VideoEncoder encodeQueueSize behaves unpredictably after calling encode()	Chrome	@Vanilagy	Won't fix
AudioEncoder queue size not accurately reflected by encodeQueueSize	Chrome	@Vanilagy	Fixed
WebCodecs VideoDecoder Outputs Frames in Incorrect Order	Safari	Jozef Chúťka	Fixed
HDR HEVC VideoFrame draws onto a canvas as fully transparent (regression)	Chrome	@Vanilagy	Fixed
VideoDecoder HEVC key frame detection is too strict; rejects packets that Chromium decodes just fine	Chrome	@Vanilagy	Fixed
VideoDecoder fails on interlaced content when routed to hardware decoder	Chrome	@Vanilagy	Fixed
VideoEncoder with VP8/VP9 fails with zero-duration VideoFrame	Chrome	@Vanilagy	Fixed
VideoDecoder key frame detection too strict, rejects non-IDR AVC key frames, causing decoder error	Chrome	@Vanilagy	Open
VideoEncoder performance drastically degrades if the page needs to rerender	Chrome	@Vanilagy	Open
AudioDecoder.isConfigSupported() returns false positive	Chrome	@JonnyBurger	Fixed
AudioDecoder doesn't respect chunks with negative timestamps, starts AudioData timestamps at 0	Chrome	@Vanilagy	Open
HEVC VideoEncoder on AMD hardware on Windows labels first emitted chunk as "delta"	Chrome	@Vanilagy	Open
VideoPixelFormat I444AP12 is not recognized	Chrome	@Vanilagy	Open