RTSP timeout for GET_PARAMETER request is hardcoded

[walter]

The timeout for keep-alive requests made to an RTSP stream is not customizable. Instead, it is hardcoded in rtspc.c file to 60 seconds.

The current parameter -timeout only stands for incomming connections (implies the ‘rtsp_flags’ set to ‘listen’).

Also the value seems to be overwriten later with the response from the SETUP request made at the RTSP stream start. This should be avoided also.

This is needed to allow for larger timeout values preventing ffmpeg to drop out.