Green video output

[asc4nio]

https://mediabunny.dev/examples/procedural-generation/ is generating a green video output on chrome based browser.

[Vanilagy]

Linux?

[asc4nio]

Yes, I've just tested it on andoroid and its working fine there.

[Vanilagy]

Yeah, Chromium bug. If you can isolate it (pure WebCodecs), then you should absolutely report this to the Chromium team

https://issues.chromium.org/issues/wizard

[Vanilagy]

Do you need any help doing so? I can't reproduce the bug so I won't be able to create a repro. Creating bug reports for Chromium is super easy, I've done it like 15 times already

[asc4nio]

I've reported it.
While waiting for the bug fix I can share my workaround that consist in manually 'sanitizing' the alpha channel by forcing the channel to 255 and create the VideoFrame from a bitmap of canvas data.

const imageData = this.encoderCtx.getImageData( 0, 0, this.encoderWidth, this.encoderHeight ); const data = imageData.data; for (let i = 0; i < data.length; i += 4) { data[i + 3] = 255; } const bitmap = await createImageBitmap(imageData); frame = new VideoFrame(bitmap, { timestamp: timestampMicroseconds, alpha: "discard", displayWidth: this.encoderWidth, displayHeight: this.encoderHeight, }); bitmap.close();

Slower approach but it's working

[Vanilagy]

Can you share the link?

[asc4nio]

https://issues.chromium.org/issues/475889452

[Vanilagy]

Awesome, seems to be good activity on that issue. When Dale responds, you know it'll be taken seriously. (we love Dale)