use native timestamps instead of time.Duration

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 15 lines in your changes missing coverage. Please review.

Project coverage is 72.98%. Comparing base (076f27f) to head (c5a9bc5).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
client_stream_processor_fmp4.go	78.26%	3 Missing and 2 partials ⚠️
muxer_stream.go	42.85%	3 Missing and 1 partial ⚠️
client.go	50.00%	3 Missing ⚠️
muxer_segmenter.go	91.42%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
- Coverage   73.16%   72.98%   -0.19%     
==========================================
  Files          58       58              
  Lines        3932     3950      +18     
==========================================
+ Hits         2877     2883       +6     
- Misses        865      875      +10     
- Partials      190      192       +2     

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