rtmp: fix compatibility with DJI Osmo Action 4 (#3802)

[aler9]

Fixes #3802

[codecov]

Codecov Report

Attention: Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 56.22%. Comparing base (6bc17de) to head (0d3726c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/protocols/rtmp/reader.go	70.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4116      +/-   ##
==========================================
+ Coverage   56.21%   56.22%   +0.01%     
==========================================
  Files         199      199              
  Lines       20567    20562       -5     
==========================================
+ Hits        11561    11562       +1     
+ Misses       8136     8132       -4     
+ Partials      870      868       -2     

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[github-actions]

This issue is mentioned in release v1.11.1 🚀
Check out the entire changelog by clicking here