transparent player, why is alpha set false, with no override

I would like to play an alpha video on a background, but the VideoContext webglContextAttributes alpha Can’t be overriden because it is copied last.

Why is this done? If I change it to true works as expected, giving transparent player.

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`_classCallCheck(this, VideoContext);

            this._canvas = canvas;
            this._endOnLastSourceEnd = endOnLastSourceEnd;

            this._gl = canvas.getContext("experimental-webgl", Object.assign({ preserveDrawingBuffer: true }, // can be overriden
            webglContextAttributes, { alpha: false // Can't be overriden because it is copied last
            }));`

[gsouquet]

I remember seeing a comment from Matthew in the code

if (webglContextAttributes.alpha === true){
  console.error("webglContextAttributes.alpha must be false for correct opeation");
}

I assume it has to do with performance as you said but possible with fidelity of the output. With new APIs like MediaRecorder you could end up with a different output than what you have previewed in your browser.

This would need to be investigated a bit more. I think the default has to be alpha: false for sure. But I can’t see major problems that would arise with letting developers override that

[gsouquet]

@icyield I believe I didn’t explain myself correctly. We could probably allow an alpha override. However if we are going to allow that I believe we should think about how we can communicate the limitations this brings with the desynchronised rendering.

Maybe through documentation or maybe make the library check if anything is stacked above the canvas. Not sure