1334916 - Youtube playback not working with media.autoplay.enabled=true

Status: RESOLVED INVALID

(Core :: Audio/Video: Playback, defect)

Description

[Johnny Stenback (:jst)]

In a fresh profile youtube works fine in recent nightly builds for me, but in two existing profiles with lots of windows etc, youtube won't play. I've seen this in  builds from over the past couple of weeks I think. Embedded youtube instances do play, but if I go to, say, https://www.youtube.com/watch?v=jW8ICe0YPgA then see the first frame with the youtube spinner over it, but no playback of video or audio. Here's about:media when that happens:

HTMLMediaElement debug data

https://www.youtube.com/watch?v=jW8ICe0YPgA
	blob:https://www.youtube.com/d923dcec-d549-47f5-a53d-dde9a3eeb3b2
	currentTime: 0 readyState: 4
	Quality: -- (total:0 dropped:0 corrupted:0)
	Buffered ranges: [(0, 150.001)]
		SourceBuffer 0
			start=0 end=150.001
		SourceBuffer 1
			start=0 end=155.001
	Internal Data:
	audio decoder: shutdown
	audio frames decoded: 1
	audio state: ni=0 no=0 ie=0 demuxr:0 demuxq:0 tt:-1.000000 tths:-1 in:0 out:0 qs=0 pending:0 waiting:0 wfk:0 sid:3
	video decoder: shutdown
	hardware video decoding: disabled
	video frames decoded: 1 (skipped:0)
	video state: ni=0 no=0 ie=0 demuxr:0 demuxq:0 tt:-1.000000 tths:-1 in:0 out:0 qs=0 pending:0 waiting:0 wfk:0, sid:2
	Dumping data for demuxer 7f04dc097800:
		Dumping Audio Track Buffer(audio/opus): - mLastAudioTime: 0.000000
			NumSamples:7500 Size:4719363 Evictable:0 NextGetSampleIndex:0 NextInsertionIndex:7500
			Buffered: ranges=[(0.000000, 150.001000)]
		Dumping Video Track Buffer(video/webm; codecs=vp9) - mLastVideoTime: 0.000000
			NumSamples:4650 Size:12906024 Evictable:0 NextGetSampleIndex:0 NextInsertionIndex:4650
			Buffered: ranges=[(0.000000, 155.001000)]

Comment 1

[Jean-Yves Avenard [:jya]]

Can you please copy the output of about:support on one of the profile that doesn't work.

To see which prefs you've changed.

Comment 2

[Jean-Yves Avenard [:jya]]

sounds like the disable auto-play setting is set, that messes up with youtube.

Comment 3

[Johnny Stenback (:jst)]

Aha! That was indeed it. Is that a youtube bug or our autoplay stuff?

Thanks! Guessing we should mark this invalid unless there's work to do for autoplay disabling...