fix MPEG-4 audio configuration not matching error (#5468)

[aler9]

This happened when using alwaysAvailableFile and a MPEG-4 audio track.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 59.92%. Comparing base (5e80554) to head (a8dd2ba).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/stream/stream.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5533      +/-   ##
==========================================
- Coverage   59.95%   59.92%   -0.04%     
==========================================
  Files         200      200              
  Lines       16801    16802       +1     
==========================================
- Hits        10073    10068       -5     
- Misses       5859     5864       +5     
- Partials      869      870       +1     

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