w3c/webcodecs

View on GitHub

WebCodecs is a flexible web API for encoding and decoding audio and video.

Stars: 1.3k
Forks: 194
Open beginner issues: 0
Indexed issues: 135
Avg merge: 1d 13h
Merged PRs (30d): 3

Dominant language: HTML
License: No license data
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

Open All

135 open issues indexed

Clarify `reset()` behaviour when multiple things are being output Open

CR Blocking

Difficulty 5/5 Over a week Newbie friendliness 30/100

w3c/webcodecs#755 · 3 comments · Opened Dec 13, 2023
Support for AV1 switch frames Open

extension

Difficulty 5/5 Over a week Newbie friendliness 25/100

w3c/webcodecs#747 · 5 comments · Opened Nov 14, 2023
isConfigSupported: definition of "invalid" Open

needs-tests

Difficulty 4/5 3-5 days Newbie friendliness 35/100

w3c/webcodecs#744 · 5 comments · Opened Nov 11, 2023
Long term reference support for AVC/HEVC Open

extension RTC

w3c/webcodecs#743 · 10 comments · 1 assignee · Opened Nov 9, 2023
Explicit frame drop signal from VideoEncoder Open

extension RTC

w3c/webcodecs#742 · 14 comments · 1 assignee · Opened Nov 6, 2023
Chunk data definitions are incomplete (VP9, AV1) Open

CR Blocking

Difficulty 4/5 3-5 days Newbie friendliness 35/100

w3c/webcodecs#731 · Opened Oct 19, 2023
What does `allocationSize` return if formats in the source and destination are null? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

w3c/webcodecs#727 · 2 comments · Opened Oct 3, 2023
Rounding direction for `AudioData.duration` Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

w3c/webcodecs#726 · 1 comment · Opened Oct 3, 2023
value of optimizeForLatency in emitted decoder configuration Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

w3c/webcodecs#725 · 1 comment · Opened Oct 3, 2023
decodeQueueSize/encodeQueueSize is not updated on the task where dequeue event is fired Open

CR Blocking

Difficulty 5/5 Over a week Newbie friendliness 25/100

w3c/webcodecs#724 · 5 comments · Opened Oct 3, 2023
Specify cross-agent-cluster structured cloning for various Web Codecs API objects Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

w3c/webcodecs#717 · 3 comments · Opened Sep 11, 2023
Is https://www.w3.org/TR/webcodecs/#dom-audioencoder-encode complete enough? Open

Difficulty 3/5 1-2 days Newbie friendliness 43/100

w3c/webcodecs#716 · 3 comments · Opened Sep 3, 2023
https://w3c.github.io/webcodecs/#dom-videoframe-videoframe-data-init should validate the plane layout according the coded width and height Open

w3c/webcodecs#702 · 2 comments · 1 assignee · Opened Jul 7, 2023
https://w3c.github.io/webcodecs/#dom-videoframe-videoframe could check origin-clean sooner Open

Ready for PR

Difficulty 5/5 Over a week Newbie friendliness 35/100

w3c/webcodecs#682 · 5 comments · Opened Jun 14, 2023
Should VideoEncoderConfig cloning remove parameters that are not useful for a given codec? Open

CR Blocking Ready for PR

Difficulty 4/5 3-5 days Newbie friendliness 25/100

w3c/webcodecs#681 · 8 comments · Opened Jun 14, 2023
YCoCg matrix support Open

Question

Difficulty 5/5 Over a week Newbie friendliness 35/100

w3c/webcodecs#678 · 2 comments · Opened Jun 5, 2023
Could ImageDecoder support non-RGBA8 color formats? Open

Question

Difficulty 5/5 Over a week Newbie friendliness 30/100

w3c/webcodecs#677 · 2 comments · Opened Jun 1, 2023
Add audio recording to capture to file sample. Open

samples

Difficulty 5/5 Over a week Newbie friendliness 30/100

w3c/webcodecs#670 · 1 comment · Opened Apr 28, 2023
Consider marking an I-frame with Recovery Point SEI message as h264 key frame Open

maybe need-definition registry

w3c/webcodecs#650 · 28 comments · 4 reactions · 2 assignees · Opened Mar 9, 2023
Audio codec, priming samples and padding, without container or information from the encoder Open

CR Blocking need-definition

w3c/webcodecs#626 · 15 comments · 3 reactions · 1 assignee · Opened Jan 13, 2023
Relationship between VideoFrameMetadata and VideoFrameCallbackMetadata Open

PR exists

Difficulty 5/5 Over a week Newbie friendliness 25/100

w3c/webcodecs#599 · 6 comments · Opened Oct 26, 2022
https://w3c.github.io/webcodecs/#videoframe-compute-layout-and-allocation-size is not taking into account RGB formats Open

need-definition

w3c/webcodecs#573 · 5 comments · 1 assignee · Opened Oct 7, 2022
VideoDecoder API may expose the underlying buffer pool size Open

privacy-tracker

Difficulty 5/5 Over a week Newbie friendliness 25/100

w3c/webcodecs#569 · 5 comments · Opened Sep 29, 2022
Opus Packet Loss Concealment Open

extension

w3c/webcodecs#558 · 14 comments · 3 assignees · Opened Sep 14, 2022
Use smaller sample files Open

samples

Difficulty 3/5 1-2 days Newbie friendliness 38/100

w3c/webcodecs#537 · 1 comment · Opened Aug 22, 2022
Setup Netlify for hosting (some) samples Open

samples

w3c/webcodecs#531 · 10 comments · 1 assignee · Opened Aug 16, 2022
VideoTransferCharacteristics/"Iec61966_2_1" is an unhelpful name for most people Open

extension

Difficulty 3/5 1-2 days Newbie friendliness 35/100

w3c/webcodecs#529 · 1 comment · 1 reaction · Opened Aug 16, 2022
Should spec validate buffer size by codedSize when constructing VideoFrame from a buffer Open

need-definition

w3c/webcodecs#516 · 1 comment · 1 assignee · Opened Jul 28, 2022
Alignment should be checked in VideoFrame constructor and related methods Open

need-definition

w3c/webcodecs#512 · 1 assignee · Opened Jul 18, 2022
No convenient way of rebasing AudioData timestamp Open

extension

Difficulty 5/5 Over a week Newbie friendliness 30/100

w3c/webcodecs#505 · 5 comments · 3 reactions · Opened Jun 29, 2022
VideoDecoderConfig optimizeForLatency dropped frames and performance Open

samples

w3c/webcodecs#491 · 5 comments · 1 assignee · Opened May 15, 2022
constructing new VideoFrame(HTMLVideoElement,...) shouldn't rely on <video>.networkState Open

need-definition

Difficulty 5/5 Over a week Newbie friendliness 25/100

w3c/webcodecs#487 · 1 comment · Opened Apr 28, 2022
Throw TypeError for detached input BufferSource Open

need-definition

Difficulty 4/5 3-5 days Newbie friendliness 35/100

w3c/webcodecs#484 · Opened Apr 28, 2022
Content protection (EME): Looking for early adopters Open

extension hard maybe research

Difficulty 5/5 Over a week Newbie friendliness 15/100

w3c/webcodecs#483 · 1 comment · Opened Apr 28, 2022
File System Access API + WebWorker + Recording Webm video and audio sample Open

samples

Difficulty 5/5 Over a week Newbie friendliness 25/100

w3c/webcodecs#446 · 1 comment · Opened Mar 14, 2022
Per-plane VideoFrame copyTo() Open

extension

Difficulty 5/5 Over a week Newbie friendliness 20/100

w3c/webcodecs#431 · 4 reactions · Opened Jan 18, 2022
Cite hardware accel privacy mitigation in section 13 Open

privacy-needs-resolution

Difficulty 1/5 Under an hour Newbie friendliness 65/100

w3c/webcodecs#429 · Opened Dec 20, 2021
When is encoder conversion necessary? Open

extension

Difficulty 5/5 Over a week Newbie friendliness 25/100

w3c/webcodecs#407 · 18 comments · Opened Nov 19, 2021
Samples restrictive Open

samples

Difficulty 4/5 3-5 days Newbie friendliness 35/100

w3c/webcodecs#406 · 5 comments · 4 reactions · Opened Nov 18, 2021
HDR support Open

extension p1

Difficulty 5/5 Over a week Newbie friendliness 25/100

w3c/webcodecs#384 · 11 comments · 1 reaction · Opened Oct 22, 2021
Definitely assigned fields in return value dictionaries should be marked as `required` Open

editorial

Difficulty 3/5 1-2 days Newbie friendliness 45/100

w3c/webcodecs#381 · 1 comment · Opened Oct 15, 2021
Editorial: rely more on Infra Open

editorial

Difficulty 4/5 3-5 days Newbie friendliness 25/100

w3c/webcodecs#380 · Opened Oct 14, 2021
Reference counting and "new reference" Open

editorial

Difficulty 4/5 3-5 days Newbie friendliness 35/100

w3c/webcodecs#379 · 1 comment · Opened Oct 14, 2021
Dealing with sample rates for WebCodecs + WebAudio Open

extension

Difficulty 5/5 Over a week Newbie friendliness 20/100

w3c/webcodecs#378 · 1 comment · Opened Oct 11, 2021
Decoding WebM files with alpha Open

extension

Difficulty 4/5 3-5 days Newbie friendliness 30/100

w3c/webcodecs#377 · 18 comments · Opened Oct 8, 2021
Clarify AudioEncoderConfig.sampleRate semantics Open

editorial

Difficulty 1/5 Under an hour Newbie friendliness 68/100

w3c/webcodecs#370 · Opened Sep 29, 2021
Active, background codecs shouldn't be reclaimed. Open

extension

Difficulty 5/5 Over a week Newbie friendliness 20/100

w3c/webcodecs#363 · 3 comments · Opened Sep 23, 2021
Mandate support from/to any AudioSampleFormat Open

extension

Difficulty 5/5 Over a week Newbie friendliness 25/100

w3c/webcodecs#352 · 4 comments · Opened Sep 8, 2021
OpusBitstreamFormat for AudioEncoderConfig Open

extension

Difficulty 5/5 Over a week Newbie friendliness 30/100

w3c/webcodecs#342 · 2 comments · Opened Aug 17, 2021
Spec errors for VideoFrame sizing exceeding implementation max Open

editorial

Difficulty 5/5 Over a week Newbie friendliness 35/100

w3c/webcodecs#339 · 4 comments · Opened Aug 13, 2021

w3c/webcodecs

Get new issues in your inbox