fix single aac file rtmp publish error.

[suzp1984]

Which version are you using?

current main branch.

Which operating system are you using?

• macOS amd64 standard

Describe the issue

when I publish an aac file by ffmpeg to mediamtx, I met an error.

2024/06/01 17:10:55 INF [RTMP] [conn [::1]:57689] closed: not enough bits

The root cause is the mediamtx want to parse an audio message with empty payload.

Describe how to replicate the issue

1. start the server: ./mediamtx
2. publish an aac file with ffmpeg: ffmpeg -stream_loop -1 -re -i music.aac -c copy -f flv -y rtmp://localhost/live/test
3. check the mediamtx log: INF [RTMP] [conn [::1]:57689] closed: not enough bits
   and ffmpeg cmd exit with error.

Did you attach the server logs?

yes

MediaMTX logs

2024/06/01 17:10:53 INF MediaMTX v0.0.0
2024/06/01 17:10:53 INF configuration loaded from /Users/jacobsu/hack/media/mediamtx/mediamtx.yml
2024/06/01 17:10:53 INF [RTSP] listener opened on :8554 (TCP), :8000 (UDP/RTP), :8001 (UDP/RTCP)
2024/06/01 17:10:53 INF [RTMP] listener opened on :1935
2024/06/01 17:10:53 INF [HLS] listener opened on :8888
2024/06/01 17:10:53 INF [WebRTC] listener opened on :8889 (HTTP), :8189 (ICE/UDP)
2024/06/01 17:10:53 INF [SRT] listener opened on :8890 (UDP)
2024/06/01 17:10:55 INF [RTMP] [conn [::1]:57689] opened
2024/06/01 17:10:55 INF [RTMP] [conn [::1]:57689] closed: not enough bits

Did you attach a network dump?

no

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.24%. Comparing base (16d0bb7) to head (236209e).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3414      +/-   ##
==========================================
+ Coverage   55.68%   56.24%   +0.56%     
==========================================
  Files         191      190       -1     
  Lines       18897    19078     +181     
==========================================
+ Hits        10522    10731     +209     
+ Misses       7570     7523      -47     
- Partials      805      824      +19     

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[aler9]

i added tests and merged, thanks!

[github-actions]

This issue is mentioned in release v1.8.3 🚀
Check out the entire changelog by clicking here