Video Tag does not create Textures properly in Chrome using webm with an Alpha Channel

[Ladar]

I am trying to Layer multiple video sources in WebGL in Chrome.

When I create a texture from the video tag in Chrome, with a Video that has an Alpha channel (webm) the resulting texture contains the frames of all the previous frames that were displayed. It looks similar to what would happen if I wasn't calling gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT) but only in the texture. If the texture does not contain Alpha (And thus has to redraw the entire video space) then it works fine.

function handleCanvasTexture(texture,  //Already Created Texture
                             textureCanvas // Video Tag that plays the video
                             ) {
if (video.src != "" && video.readyState == 4){
        gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
    gl.bindTexture(gl.TEXTURE_2D, texture);
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, textureCanvas); // This is the important line!

    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);

    gl.bindTexture(gl.TEXTURE_2D, null); // unbind the Texture

return;
}

[PhistucK]

Sounds like a bug. Can you, please, look for an existing issue at crbug.com and if you do not find one, create one?

Thank you.

☆PhistucK

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[Kenneth Russell]

Agreed, sounds like a bug. It sounds like the portions of the video
that have alpha < 1 aren't being cleared properly frame-to-frame.
Could you please file a bug and provide a small test case? Please post
the bug ID here once filed.

Thanks,

-Ken