1. by default, stream is from Xvfb0 source to RTSP server
2. after some time, I send, through zmq (zmqsend), some command sequence
to switch the source from Xvfb0 to Xvfb1 without RTSP stream interrupting
Is it a possibility with ffmpeg + ffserver? If it's possible, which
commands sequence I'll send to ffserver?