add todo for ffmpeg

@@ -72,19 +72,18 @@ vhost __defaultVhost__ {
 vhost dev {
     enabled         on;
     gop_cache       on;
-    hls             off;
+    hls             on;
     hls_path        ./objs/nginx/html;
     hls_fragment    5;
     hls_window      30;
     #forward         127.0.0.1:19350;
     #forward         127.0.0.1:1936;
     transcode {
-        enabled     on;
+        enabled     off;
         ffmpeg      ./objs/ffmpeg/bin/ffmpeg;
         engine dev {
             enabled         on;
             vfilter {
-                t   10;
             }
             vcodec          libx264;
             vbitrate        300;

@@ -374,6 +374,8 @@ int SrsFFMPEG::cycle()
 		return ret;
 	}
 	
+	// TODO: to support rewind.
+	
 	if (p == 0) {
 		srs_info("transcode process pid=%d is running.", pid);
 		return ret;
@@ -391,6 +393,8 @@ void SrsFFMPEG::stop()
 		return;
 	}
 	
+	// TODO: kill the ffmpeg process when stop.
+	
 	std::vector<std::string>::iterator it;
 	it = std::find(_transcoded_url.begin(), _transcoded_url.end(), output);
 	if (it != _transcoded_url.end()) {