报错
试用ffmpeg请求rtsp流时，UDP端口时无法返回
[rtsp @ 0x5650696e2580] UDP timeout, retrying with TCP
[rtsp @ 0x5650696e2580] method SETUP failed: 454 Session Not Found
[rtsp @ 0x5650696e2580] Could not find codec parameters for stream 0 (Video: h264, none): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
解决
强制将ffmpeg对rtsp拉流时试用tcp协议，目前有效,加上-rtsp_transport tcp参数
ffmpeg -rtsp_transport tcp -i 'rtsp://admin:[email protected]:554/cam/realmonitor?channel=17&subtype=0' -an -c:v copy -f mp4 -movflags +frag_keyframe+empty_moov+default_base_moof pipe:1
但是性能上是存在问题的，毕竟tcp需要多次握手，具体UDP为什么无法使用，问题还在排查中。