Bug 183259

Summary: [GStreamer] Cannot play particular WebM videos
Product: WebKit Reporter: Michael Catanzaro <mcatanzaro>
Component: MediaAssignee: Nobody <webkit-unassigned>
Status: REOPENED ---    
Severity: Normal CC: bugs-noreply, cgarcia, mcatanzaro, pnormand
Priority: P2    
Version: Other   
Hardware: PC   
OS: Windows 10   

Description Michael Catanzaro 2018-03-01 13:59:50 PST
I can't play this simple WebM video in Epiphany Tech Preview (WebKitGTK+ 2.19.91):

https://raw.githubusercontent.com/gnome-design-team/gnome-mockups/master/gtk/loop5.webm

I think it's different from bug #182653 because that video starts to play and only seek is broken, whereas this video does not play at all.
Comment 1 Philippe Normand 2018-03-02 01:44:25 PST
Add it to an html file in a <video> element and it plays.
Comment 2 Michael Catanzaro 2018-03-02 08:09:48 PST
Ummmm that should not be required, and was not required in the past. We are even showing media controls for it and everything. They're just broken.

If we did not support directly playing media files, we would need to start a download instead of displaying broken media controls. But I'm pretty sure this used to work. I see it is also broken in 2.18.6, though.
Comment 3 Michael Catanzaro 2018-03-25 18:13:30 PDT
Carlos, any chance you know how this is supposed to work?
Comment 4 Carlos Garcia Campos 2018-03-25 23:36:26 PDT
I giess we are doing something different in case of MediaDocument
Comment 5 Philippe Normand 2018-07-06 07:06:04 PDT
The problem seems to be that loop5.webm is thought to be audio/webm by the DOMImplementation and MediaDocument seems to handle only <video> elements, so an empty page is displayed, only controls are visible.
Comment 6 Philippe Normand 2018-07-10 02:50:23 PDT
The HTTP response header has the wrong content-type set, so not sure what to do about this. One thing to consider, maybe don't set the type attr on the video element created by the MediaDocument. I tried that and got a bunch of XSS errors afterwards :S
Comment 7 Michael Catanzaro 2019-01-28 07:32:26 PST
Another example video that fails to play:

https://matrix.org/_matrix/media/v1/download/matrix.org/vatFhMWBkNvNZhJWOdQCkeaQ