Feature: Add option to unwrap MPEG-TS from RTSP

[EricHenry]

Closes: #3811

I took the advice of the comment: #3811 (comment) to handle unwrapping of the MPEG-TS container into it's individual tracks. This feature is contained behind a configuration flag and is an opt-in only feature. This feature should not effect user's who do not need it.

Summary of changes:

rtp_mpegts_reader: Used to extract mpegts payloads from the RTP packets.
mpegts_demuxer: setups up and runs the demuxing flow

[aler9]

This feature is quite useful, the implementation needs some work. The first step is probably to move the MPEG-TS demuxer and muxer inside gortsplib. This allows to have access to raw 188-long MPEG-TS packets. These can then be fed into the MPEG-TS reader inside MediaMTX.

[EricHenry]

thanks for the feedback @aler9 , Let me get to work on migrating that over

[EricHenry]

I'll make sure to remove this once bluenviron/gortsplib#1007 looks good and is merged.

[EricHenry]

@aler9 I got rid of the separate mpegts reader after I made the changes to bluenviron/gortsplib#1007 let me know how the latest update looks and if you'd like to see any additional changes.

Thanks!!

[EricHenry]

updated to use the latest changes from bluenviron/gortsplib#1007 thanks for the feedback on that one!

[ingalls]

@aler9 We've been testing this extensively in production and haven't had any issues so far, are there any additional considerations to merging it?

[codecov]

Codecov Report

❌ Patch coverage is 65.62500% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.51%. Comparing base (c8e07b5) to head (56d3d96).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/servers/rtsp/mpegts_demuxer.go	63.33%	13 Missing and 9 partials ⚠️
internal/servers/rtsp/session.go	69.44%	9 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5476      +/-   ##
==========================================
- Coverage   62.51%   62.51%   -0.01%     
==========================================
  Files         202      203       +1     
  Lines       17131    17226      +95     
==========================================
+ Hits        10709    10768      +59     
- Misses       5547     5572      +25     
- Partials      875      886      +11     

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[aler9]

I refactored a little in order to conform to standards and cover some edge cases that would have caused a panic (i.e. PAUSE + MPEG-TS demuxing). In the process we lost the ability to impose a timeout to MPEG-TS track recognition, you can readd it in a following PR if you want. This has been merged, thank you very much.