1040552 - YouTube HTML5 video stops playback and buffers forever when moving seek-bar back or forward if set media.mediasource.enabled = true

Status: RESOLVED FIXED

(Core :: Audio/Video, defect)

Description

[Alice0775 White]

Steps To Reproduce:
1. Open http://www.youtube.com/watch?v=eYDjV7ajuMo
2. Wait buffering
3. Moving seek-bar back or forward

Actual Results:
Youtube HTML5 video stops playback.
Throbber is spinning.

Expected Results:
Video should continue playback

Comment 1

[JW Wang [:jwwang] [:jw_wang]]

Did you seek to a position beyond the buffer range? Or did you seek back-and-forth after completely buffered?

Comment 2

[Alice0775 White]

(In reply to JW Wang [:jwwang] from comment #1)
> Did you seek to a position beyond the buffer range? 
Yes

> did you seek back-and-forth after completely buffered?
Regardless of progress of buffering

Comment 3

[Alice0775 White]

Err
> Did you seek to a position beyond the buffer range? 
No.
Seeking within buffered range.

Comment 4

[Alice0775 White]

Oops, I forgot to set media.mediasource.enabled = true.
The prefs causes the problem.

Comment 5

[Chris Peterson [:cpeterson]]

I see these YouTube buffering problems on OS X using Nightly 34. With media.mediasource.enabled = true, the video buffers forever when I try to skip ahead. YouTube's "Stats for nerds" reports the video is using VP9 with DASH. With media.mediasource.enabled = false, video playback skips ahead as expected and "Stats for nerds" reports the video is using VP8 without DASH.

Comment 6

[u194118]

With nightly 34a1 (2014-08-15)and media.mediasource.enabled = true
"Stats for nerds" reports the video is using VP9 with DASH.

If I skip back or forward in the buffered range, the video correctly appears immediately. 
So I don't see this bug.

However one time in two the sound doesn't work anymore. Then if I skip back or forward in the buffered range one or two time the sound works again.

Comment 7

[bull500]

i have this issue present with media.mediasource.enabled = true
VP9 and DASH. Fedora Linux 20. Latest Nightly 34.0a1 (2014-08-15).
Video - https://www.youtube.com/watch?v=cu_usjjvg-o

The video can seek back and play in the buffered range. 
But the video stops playback once it reaches the unbuffered range or it shows up some frame in the video after some time of loading/buffering

Plus video fails to play from a specific point on the seek bar if the video is unbuffered.
Surprisingly it shows the end of the video playback screen on YouTube if played from a random point of the seek bar.

Comment 9

[cajbir (:cajbir)]

This is effectively a duplicate of the meta seeking bug 1056440. The following patches on mozilla-central fix seeking issues described here and we can close when they are landed/resolved.

bug 1061007 - is in inbound
bug 1059058 attachment 8481052 [details] [diff] [review]
R bug 1062020 - under review
R bug 1062018 - under review
bug 1061400/1059058 attachment 8481053 [details] [diff] [review]
bug 1059058 attachment 8481092 [details] [diff] [review]
bug 1062023 - complete and will be landed but has dependencies above

Comment 10

[Matthew Gregan [:kinetik]]

Everything in comment 9 has landed, so resolving as fixed.  Please file a new bug for any seeking issues and make it block bug 1056440.