[Webkit-unassigned] [Bug 179417] HLS WebGL video textures black rendering since IOS 11

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179417

--- Comment #51 from Jeremy Gordon <jeremy at projector.com> ---
Thank you for your help!

Unfortunately, it's not working and/or maybe I'm not following.

Here's my situation:

I have a custom WebGL based renderer. I create an offscreen <video> element pointing to an .m3u8 URL that has CORS setup appropriately. When the video has reached a readyState of "4" I create an RGB format WebGL texture of size videoWidth and videoHeight passing the HTMLVideoElement instance for the pixel data. The texture renders as all black pixels.

If I changed the <video> element to point to an .mp4 URL on the same server, wait for the offscreen <video> element to reach a readyState of "4" the texture renders with the video pixels.

Taking your advice, I added an event handler for "resize" to my offscreen <video> HTMLVideoElement element. That event handler does get called back, and my plan was to recreate the WebGL texture and make sure I'm using updated dimensions for videoWidth and videoHeight.

Unfortunately, the "resize" callbacks happen well before the video reaches a readyState of "4" and the videoWidth and videoHeight dimensions are unchanged (and correct).

In summary, the WebGL texture is only created after the readyState is "4" and all the "resize" events have been fired on HTMLVideoElement and I still see all black texels in the video. This is only the case for HLS/.m3u8 videos. Everything works fine in the case of .mp4 videos. The .m3u8 videos that do not work are encoded with identical resolution, bitrates, profile settings, etc as the .mp4 videos that do work.

Additionally, everything works fine on all other iOS devices with either HLS/.m3u8 or .mp4 except on iPhone 12 devices, where only .mp4 videos are working as a TextureSource for WebGL textures.

I have confirmed the problem behavior on multiple iPhone 12 devices with iOS 14.2.1+ and confirmed the successful behavior on multiple other iOS devices (i.e. iPad, iPhone 11, etc).

Am I misunderstanding your suggestion?

Thank you so much for taking the time to reply!

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.webkit.org/pipermail/webkit-unassigned/attachments/20201219/10f5a8ab/attachment.htm>