print warning when the write queue is full

[aler9]

No description provided.

[codecov]

Codecov Report

Merging #2251 (e00d05a) into main (d6bdf4b) will decrease coverage by 0.07%.
The diff coverage is 54.16%.

@@            Coverage Diff             @@
##             main    #2251      +/-   ##
==========================================
- Coverage   61.29%   61.23%   -0.07%     
==========================================
  Files         119      120       +1     
  Lines       13022    13039      +17     
==========================================
+ Hits         7982     7984       +2     
- Misses       4423     4439      +16     
+ Partials      617      616       -1     

Files Changed	Coverage Δ
internal/core/rtsp_server.go	85.81% <0.00%> (-0.93%)	⬇️
internal/core/rtsp_session.go	69.36% <0.00%> (-1.93%)	⬇️
internal/core/hls_muxer.go	54.70% <33.33%> (-0.58%)	⬇️
internal/core/srt_conn.go	48.21% <50.00%> (-0.20%)	⬇️
internal/core/rtmp_conn.go	63.09% <64.28%> (-0.10%)	⬇️
internal/core/webrtc_session.go	69.05% <66.66%> (-0.64%)	⬇️
internal/core/async_writer.go	70.27% <70.27%> (ø)
internal/core/webrtc_outgoing_track.go	25.45% <100.00%> (+0.63%)	⬆️

... and 3 files with indirect coverage changes

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