support AC-3 tracks in SRT and UDP; support recording AC-3 tracks

[aler9]

No description provided.

[codecov]

Codecov Report

Merging #2376 (9681056) into main (8fd7019) will increase coverage by 0.09%.
The diff coverage is 11.41%.

@@            Coverage Diff             @@
##             main    #2376      +/-   ##
==========================================
+ Coverage   61.23%   61.33%   +0.09%     
==========================================
  Files         127      129       +2     
  Lines       14565    14452     -113     
==========================================
- Hits         8919     8864      -55     
+ Misses       4980     4922      -58     
  Partials      666      666              

Files Changed	Coverage Δ
internal/formatprocessor/ac3.go	0.00% <0.00%> (ø)
internal/formatprocessor/processor.go	25.00% <0.00%> (-1.67%)	⬇️
internal/record/agent.go	32.95% <0.00%> (-3.37%)	⬇️
internal/core/srt_conn.go	53.77% <4.34%> (+5.49%)	⬆️
internal/core/mpegts.go	20.23% <20.23%> (ø)
internal/core/srt_source.go	59.21% <33.33%> (+24.64%)	⬆️
internal/core/udp_source.go	64.13% <33.33%> (+25.93%)	⬆️

... and 3 files with indirect coverage changes

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