support muxing and reading VP9 tracks

[aler9]

No description provided.

[codecov]

Codecov Report

Merging #71 (a33a05a) into main (3df19dd) will decrease coverage by 0.10%.
The diff coverage is 16.90%.

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
- Coverage   69.10%   69.01%   -0.10%     
==========================================
  Files          42       42              
  Lines        3632     3676      +44     
==========================================
+ Hits         2510     2537      +27     
- Misses        939      959      +20     
+ Partials      183      180       -3     

Files Changed	Coverage Δ
client.go	79.16% <0.00%> (-2.27%)	⬇️
muxer_segmenter_mpegts.go	83.05% <0.00%> (-0.95%)	⬇️
muxer_server.go	70.60% <0.00%> (+3.17%)	⬆️
muxer.go	35.88% <5.33%> (-10.51%)	⬇️
client_processor_fmp4.go	52.02% <8.33%> (-2.48%)	⬇️
muxer_segmenter_fmp4.go	67.96% <33.33%> (+7.81%)	⬆️
pkg/codecparams/marshal.go	58.45% <100.00%> (+1.51%)	⬆️

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