MediaRecorder : frame loss on mobile devices

[sr1dh4r]

Browser name including version (e.g. Chrome 64.0.3282.119)

Chrome 83.0.4103.106

Description
Frames are lost in the recording.

Steps to reproduce
Testing:

Open https://webrtc.github.io/samples/src/content/getusermedia/record/ link in mobile chrome browser on android.

Expected results
Recording should be available without any frame drop.

Actual results
Recording has a lot of frame loss.

Related issues
#177
webrtc/samples#1331 (Opening it here since it seems more relevant)

[guest271314]

How is frame loss determined?

Have you tried using start(0) with requetData() and comparing result with start() without timeSlice?

Have you tested with h264/avc1 codec?

[sr1dh4r]

How is frame loss determined?
Visually, please try the linked shared on a mobile device.

Have you tried using start(0) with requetData() and comparing result with start() without timeSlice?
Yes, I see no difference.

Have you tested with h264/avc1 codec?
I have tested against vp8, vp9 webm codecs as described in #177 and I don't expect it to be any different.

[guest271314]

What are the steps to reproduce?

"a mobile device" is a broad category. What specific device?

How did you verify frame loss other than visually?

What is the expected result?

[sr1dh4r]

What are the steps to reproduce?

"a mobile device" is a broad category. What specific device?

How did you verify frame loss other than visually?

What is the expected result?

#201 (comment)

[dontcallmedom]

unless there are clear reasons why the design of the spec makes it not usable on mobile devices (which this issue doesn't cover), this sounds like an implementation issue. Closing until further motivation is given