update readme

@@ -20,6 +20,8 @@ step 2: publish live stream <br/>
 <pre>
 FMS URL: rtmp://127.0.0.1:1935/live
 Stream:  livestream
+For example, use ffmpeg to publish:
+    ffmpeg -re -i source.flv -vcodec copy -acodec copy -f flv -y rtmp://127.0.0.1:1935/live/livestream
 </pre>
 step 3: play live stream <br/>
 <pre>

@@ -684,7 +684,6 @@ int SrsTSMuxer::write_video(u_int32_t time, SrsCodec* codec, SrsCodecSample* sam
 				// pps
 				video_buffer->append(codec->pictureParameterSetNALUnit, codec->pictureParameterSetLength);
 			}
-			
 		}
 		
 		// sample start prefix, '00 00 00 01' or '00 00 01'