1425643 - 'canplay' never fired for video element lacking 'autoplay' attribute with MediaStream

Status: RESOLVED DUPLICATE of bug 1306999

(Core :: WebRTC: Audio/Video, defect, P2)

Description

[Andrew]

User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.75 Safari/537.36

Steps to reproduce:

Repro steps:
0. Make sure a webcam is connected and go to https://jsfiddle.net/zt31up42/5/
1. Check "Video" checkbox
2. Check "Camera" or "Canvas" -- doesn't seem to matter which.
3. Press "Start" button


Actual results:

In FF, we never arrive into the the 'canplay' handler (see top of jsfiddle js) and the video never plays.


Expected results:

In chrome, we arrive in the 'canplay' handler at the top of the js file, and it works as expected. The video starts playing.

See top of js file for additional details.

Comment 1

[Andrew]

Updated fiddle url: https://jsfiddle.net/zt31up42/
Please use that one for repro steps.

Comment 2

[Andrew]

Apologies, jsfiddle newb, here!

Use https://jsfiddle.net/zt31up42/6/ as the repro.

Comment 3

[Alex Chronopoulos [:achronop]]

I can repro in Nightly, Linux (20180111100722).

Comment 4

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

This came up on stackoverflow yesterday. The following is a seductive pattern that apparently exists:

video.oncanplay = video.play;

This works in Chrome but not in Firefox because of this bug. We should probably give this some attention.

Here's a simpler fiddle: https://jsfiddle.net/jib1/gxbfoL3y/

Comment 5

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

TBK, this problem seems limited when the source is a MediaStream. canplay is reached with regular video without autoplay.

Comment 6

[Andreas Pehrson [:pehrsons]]

This will get solved by bug 1306999.