update readme

@@ -36,7 +36,8 @@ FMS URL: rtmp://127.0.0.1:1935/live
 Stream:  livestream
 For example, use ffmpeg to publish:
     for((;;)); do \
-        ./objs/ffmpeg/bin/ffmpeg -re -i ./doc/source.200kbps.768x320.flv -vcodec copy -acodec copy \
+        ./objs/ffmpeg/bin/ffmpeg -re -i ./doc/source.200kbps.768x320.flv \
+        -vcodec copy -acodec copy \
         -f flv -y rtmp://127.0.0.1:1935/live/livestream; \
         sleep 1; \
     done

@@ -109,6 +109,7 @@ int SrsFFMPEG::initialize(std::string vhost, std::string port, std::string app,
 	if (output.length() > input.length()) {
 		tail = output.substr(input.length());
 	}
+	// TODO: better dead loop check.
 	// if input also endwiths the tail, loop detected.
 	if (!tail.empty() && input.rfind(tail) == input.length() - tail.length()) {
 		ret = ERROR_ENCODER_LOOP;

@@ -77,6 +77,8 @@ int SrsForwarder::on_publish(std::string vhost, std::string _app, std::string st
 	server = forward_server;
 	port = 1935;
 	
+	// TODO: dead loop check.
+	
 	size_t pos = forward_server.find(":");
 	if (pos != std::string::npos) {
 		port = ::atoi(forward_server.substr(pos + 1).c_str());