2017271 - Video choppy on Coursera.org after 12 hours

Status: RESOLVED WORKSFORME

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

Description

[Andreas Farre [:farre]]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36

Steps to reproduce:

1. Go to 'Coursera.org'
2. Enroll in the Microsoft Back-End Developer Professional Certificate
3. Go to ‘Guided Lab: Practical Coding with Copilot’ in the ‘Introduction to Programming With C#’ course in module 5

Actual results:

1. When you enter a long text and try to delete what you have written, confusion arises between what you have written and what you have typed on the keyboard.

2. Another problem encountered is that when you leave a tab with a video open and return to it after about 12 hours, all videos on Coursera will appear choppy.

Expected results:

1. I need to be able to enter text without overlaps or strange effects on the text that make it impossible to write.

2. Even if I leave a tab open with a video playing for an indefinite amount of time, I should be able to play the video without any lag.

Comment 1

[Andreas Farre [:farre]]

Clone from 2016362 to capture the Video issues.

Comment 2

[Karl Tomlinson (:karlt)]

(In reply to Andreas Farre [:farre] from comment #0)

2. Another problem encountered is that when you leave a tab with a video open and return to it after about 12 hours, all videos on Coursera will appear choppy.

Is that videos in the same Coursera tab, or are videos in a new Coursera tab also choppy?

Would you be able to capture and upload a profile with media logging from when this is happening, please?
See bug 1935757 comment 2 for how to do that.
A profile cannot record 12 hours worth of logging, so just record a profile for a few seconds of choppy video, please.

Comment 3

[u772551]

(In reply to Karl Tomlinson (:karlt) from comment #2)

Is that videos in the same Coursera tab, or are videos in a new Coursera tab also choppy?

Videos in a new tab are also choppy.

Would you be able to capture and upload a profile with media logging from when this is happening, please?

As soon as I have some time, I will replicate the problem and attach a short video.

Comment 4

[Karl Tomlinson (:karlt)]

(In reply to caohfi7dh from comment #3)

As soon as I have some time, I will replicate the problem and attach a short video.

To be clear, we'd need a profile rather than a screen recording to identify the cause of the choppiness.

Comment 5

[u772551]

(In reply to Karl Tomlinson (:karlt) from comment #4)

(In reply to caohfi7dh from comment #3)

As soon as I have some time, I will replicate the problem and attach a short video.

To be clear, we'd need a profile rather than a screen recording to identify the cause of the choppiness.

Hi Karl,

I didn't write back because I couldn't reproduce the issue anymore. It only happened once with Firefox version 147. With Firefox versions 148 and 149, the issue didn't occur again.

I'll provide updates if it happens again.

Thank you.