Re: [chromium-discuss] How to debug Media source Extensions.

[Mounir Lamouri]

+media-dev 

On Tue, 22 Jan 2019 at 02:25, Rahul Verma <vidhu...@gmail.com> wrote:

Hi, Is there any way I can debug the code of media source extensions? 

I am currently working on a live stream App , and chrome://media-internals keeps on showing BUFFERING_HAVE_NOTHING and BUFFERING_HAVE_ENOUGH continuously and not performing well.

clearly looks like my applications fault, and I would like to debug and see whats going on here. ( since most of the logs are DVLOG, I am not able to see them after enabling logs)

Thank you for the help.

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[Chris Cunningham]

Do you have any experience compiling chromium (admittedly a bit of work)? I enable dvlogs with gn args like so

is_debug = false                       # defaults to true, but you just want the logs

dcheck_always_on = true         # let the dvlogs flow in

> BUFFERING_HAVE_NOTHING and BUFFERING_HAVE_ENOUGH 

Oscillating between these can have 2 causes (potentially both)

1. currentTime is repeatedly reaching the end of buffered (you're appends aren't happening in time)

2. you're machine isn't able to decode the video fast enough to keep up with the playback rate, so the queue of decode frames is running empty

For 2, you can easily eliminate this by testing with an easy video (e.g. 360p @ 30fps) on a machine with decent specs (we sometimes see folks test with low resource VMs).

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[Rahul Verma]

Thank you for the response Chris.

I built chrome and I am able to debug the code, Will keep in mind the points you mentioned while debugging!.

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Rahul Verma
NVIDIA