fix crash when recording a stream with unsupported tracks (#3978)

[aler9]

Fixes #3978

[codecov]

Codecov Report

Attention: Patch coverage is 81.45695% with 28 lines in your changes missing coverage. Please review.

Project coverage is 55.99%. Comparing base (bdc051c) to head (f024671).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/recorder/format_fmp4.go	54.28%	16 Missing ⚠️
internal/recorder/format_mpegts.go	60.71%	11 Missing ⚠️
internal/recorder/recorder.go	96.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3996      +/-   ##
==========================================
+ Coverage   55.94%   55.99%   +0.05%     
==========================================
  Files         194      194              
  Lines       19583    19593      +10     
==========================================
+ Hits        10956    10972      +16     
+ Misses       7786     7782       -4     
+ Partials      841      839       -2     

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[github-actions]

This issue is mentioned in release v1.10.0 🚀
Check out the entire changelog by clicking here