obs-webrtc: Enable PacingHandler

[Sean-Der]

Description

Adds packet pacing to WebRTC output.

Motivation and Context

Pacing reduces the amount of packet loss for users. Spreading bursty content over a larger window.

How Has This Been Tested?

This isn't a problem that I have personally. I also haven't set up network simulations that exhibit the behavior either.

WHIP output users have reported they have a better experience with this. I will have them report their results in the thread.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[ProudlyTM]

Me and a friend of mine both had unexplainable artifacts and/or freezes (depending on the Encoder settings) when streaming to WHIP, but that patch seems to have gotten rid of the issues for both of us!

I can only say a big thanks @Sean-Der for the fix!

[RytoEX]

How severe/urgent/widespread is this?

[Sean-Der]

I don't believe it is very wide spread. I implemented it 3 months ago because I hoped it would help users. In those 3 months I have gotten two reports that it helped.

I think it would be good to wait for 31.

[leodog256]

It fixed long freeze. But there is still skip of a frame every like x seconds when there is not that much movement on the screen (Only in some games that i tested).

[tt2468]

Would it be possible for libdatachannel to rolling average the incoming packet data bitrate and pace off of that? That's what libsrt does, and it seems to work quite well. It means that different forms of rate control can be used.

[Sean-Der]

@tt2468 Can do! I will make the window size user adjustable