Jonny Burger JonnyBurger

Chromium nested canvas scaling at DPR 2

Related: Chromium issue 540532973 and Remotion PR 11500.

Problem

A layoutSubtree canvas captures an immediate child whose descendants include another canvas. The outer paint handler calls captureElementImage(wrapper), resets its 2D context, and calls drawElementImage(image, 0, 0).

On Chrome 153 and Canary 156 at devicePixelRatio 2, the nested canvas pixels occupy only the top-left quarter of the outer canvas. In the four-quadrant repro, the yellow bottom-right quadrant lands at the top-left and the other three sample points are transparent. Ordinary DOM content is unaffected. Chrome 150 at DPR 2 and Chrome 153 at DPR 1 show all four quadrants correctly. The same workaround works when the inner canvas also has layoutSubtree = true.

Transformers.js 4.3 WebGPU LayerNorm regression

This is a single-file browser reproduction. It has no dependencies and no build step.

python3 -m http.server 8000 --directory repros/transformers-js-4.3-webgpu-layernorm

Open http://localhost:8000 in a browser with WebGPU support.

nota0966 - 3/2/2026, 10:41:56 PM

We are using Remotion Lambdas as well as rendering videos in our UI for user previews. I've been trying to document upgrade paths for our team and currently when we upgrade we bump all versions in our apps and also redeploy lambda functions as documented. However, I don't see any documentation around rebundling. My question is, when we upgrade and redeploy a Lambda, do we also need to create a new site to go with it? In which case we would probably deploy versioned sites ( e.g. npx remotion lambda sites create --site-name v4.0.245 ).

We haven't been doing this so far and haven't come across any issues, but it might just be good luck, so wanted to confirm best practice.

jonnyburger - 3/3/2026, 1:22:48 PM

yes, you should update the site

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
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 unpredictabl

empz3190 - 2/18/2026, 1:31:54 PM

Question about the new Video component and its fallback to OffthreadVideo behavior.

I see there's a fallbackOffthreadVideoPropsprop on the Video component.

The question is, what happens with "loop"? The new Video component supports the loop property, but OffthreadVideo does not. So what would happen if, during rendering, the component needs to fallback to OffthreadVideo and it was set to loop? It certainly won't loop, right? Anyway to resolve this inconsistency?

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