1100333 - [b2g] Sometime the video.currentTime stays the same for a while, while the video is playing, after tapping the Play button

Status: RESOLVED WONTFIX

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

Description

[Martijn Wargers (dead)]

I encountered this while working on bug 1047168.

Basically, what happens on the Flame device (current trunk build), that in the browser app, after tapping the play button, the video sometimes doesn't resume playing directly.
This is causing failures in the automated test of bug 1047168.
This is really happening occasionally, like 1 in 20 times or something.

I was also able to reproduce it with this testcase: http://people.mozilla.org/~mwargers/tests/videos/VID_0001_video_page.htm

Steps to reproduce:
- Open browser app, go to http://people.mozilla.org/~mwargers/tests/videos/VID_0001_video_page.htm
- Tap on the video to show the video control
- Tap on the Pause button
- Tap on the Play button
- Repeat the above steps a couple of times

Expected result:
Every time, the video should continue smoothly. While the video is playing, the delta should be >0, normally somewhere around 0.300. No red text should appear that shows where it went wrong (showing delta and currentTime of video)

Atcual result:
Sometimes, while doing the above str, the video.currentTime is stalling, which makes the delta stay 0. In that case, red text with those results is added to the page.

I suspect this has something to do with the video controls animation that shows up and disappears while playing/pausing, because I haven't been able to reproduce this issue, using this test page (that pauses/plays programmatically):
http://people.mozilla.org/~mwargers/tests/videos/currenttime_test.htm

Comment 1

[Martijn Wargers (dead)]

I also think the video is stalled, when this bug is occuring, but I can't really tell from this particular video, I used. I would need a better video for that.

Comment 2

[Martijn Wargers (dead)]

Ok, this is a better video: http://people.mozilla.org/~mwargers/tests/videos/leader_video_page.htm
When I see this bug happening, then I indeed see the video stuttering (e.g. jank).

I see this happening more when I set the memory of the Flame device to 319mb.