webrtcTrackGatherTimeout not respected for WHEP sources

[eselman19]

Which version are you using?

v1.15.0

Which operating system are you using?

Linux amd64 Docker

Describe the issue

When using WHEP sources, the track gathering timeout is hardcoded to 2 seconds and ignores the webrtcTrackGatherTimeout configuration setting

Describe how to replicate the issue

1. start the MediaMTX with config containing:
   ...
   webrtcTrackGatherTimeout: 5s
   ...
   100:
   source: <wheps_source>
   sourceOnDemand: yes

2. observe that track gather timeout happens after 2 seconds making WHEP sources unreliable

mediamtx-1 | 2025/09/22 18:09:54 DEB [path 100] [WebRTC source] peer connection state: connecting
mediamtx-1 | 2025/09/22 18:09:54 DEB [path 100] [WebRTC source] peer connection state: connected
mediamtx-1 | 2025/09/22 18:09:54 INF [path 100] [WebRTC source] peer connection established, local candidate: host/udp/?.?.?.?/56984, remote candidate: host/udp/?.?.?.?/44446
mediamtx-1 | 2025/09/22 18:09:57 DEB [path 100] [WebRTC source] peer connection state: closed
mediamtx-1 | 2025/09/22 18:09:57 ERR [path 100] [WebRTC source] deadline exceeded while waiting tracks
mediamtx-1 | 2025/09/22 18:10:02 DEB [path 100] [WebRTC source] connecting
mediamtx-1 | 2025/09/22 18:10:02 DEB [path 100] [WebRTC source] peer connection state: connecting
mediamtx-1 | 2025/09/22 18:10:02 DEB [path 100] [WebRTC source] peer connection state: connected
mediamtx-1 | 2025/09/22 18:10:02 INF [path 100] [WebRTC source] peer connection established, local candidate: host/udp/?.?.?.?/57581, remote candidate: host/udp/?.?.?.?/44446
mediamtx-1 | 2025/09/22 18:10:04 DEB [path 100] [WebRTC source] peer connection state: closed
mediamtx-1 | 2025/09/22 18:10:04 ERR [path 100] [WebRTC source] deadline exceeded while waiting tracks
mediamtx-1 | 2025/09/22 18:10:09 DEB [path 100] [WebRTC source] connecting
mediamtx-1 | 2025/09/22 18:10:10 DEB [path 100] [WebRTC source] peer connection state: connecting
mediamtx-1 | 2025/09/22 18:10:10 DEB [path 100] [WebRTC source] peer connection state: connected
mediamtx-1 | 2025/09/22 18:10:10 INF [path 100] [WebRTC source] peer connection established, local candidate: host/udp/?.?.?.?/41536, remote candidate: host/udp/?.?.?.?/44446
mediamtx-1 | 2025/09/22 18:10:12 DEB [path 100] [WebRTC source] peer connection state: closed
mediamtx-1 | 2025/09/22 18:10:12 ERR [path 100] [WebRTC source] deadline exceeded while waiting tracks
mediamtx-1 | 2025/09/22 18:10:17 DEB [path 100] [WebRTC source] connecting
mediamtx-1 | 2025/09/22 18:10:18 DEB [path 100] [WebRTC source] peer connection state: connecting
mediamtx-1 | 2025/09/22 18:10:18 DEB [path 100] [WebRTC source] peer connection state: connected
mediamtx-1 | 2025/09/22 18:10:18 INF [path 100] [WebRTC source] peer connection established, local candidate: host/udp/?.?.?.?/45665, remote candidate: host/udp/?.?.?.?/44446
mediamtx-1 | 2025/09/22 18:10:20 DEB [path 100] [WebRTC source] peer connection state: closed
mediamtx-1 | 2025/09/22 18:10:20 ERR [path 100] [WebRTC source] deadline exceeded while waiting tracks
mediamtx-1 | 2025/09/22 18:10:25 DEB [path 100] [WebRTC source] connecting
mediamtx-1 | 2025/09/22 18:10:26 DEB [path 100] [WebRTC source] peer connection state: connecting
mediamtx-1 | 2025/09/22 18:10:26 DEB [path 100] [WebRTC source] peer connection state: connected
mediamtx-1 | 2025/09/22 18:10:26 INF [path 100] [WebRTC source] peer connection established, local candidate: host/udp/?.?.?.?/38662, remote candidate: host/udp/?.?.?.?/44446
mediamtx-1 | 2025/09/22 18:10:26 INF [path 100] [WebRTC source] ready: 1 track (H264)

MediaMTX configuration

No response

MediaMTX logs

No response

Network dump

No response