FCC能够激活，组播同步前换台可以实现快速换台，8秒后与组播同步后再换台无法实现FCC（附日志） #256
Description
11:47:20 INFO [Worker 0] New client requested URL: /player (method: GET)
11:47:20 INFO [Worker 0] New client requested URL: /playlist.m3u (method: GET)
11:47:20 INFO [Worker 0] New client requested URL: /CCTV-1%E9%AB%98%E6%B8%85 (method: GET)
11:47:20 INFO [Worker 0] Service matched: CCTV-1高清
11:47:20 INFO [Worker 0] FCC: Using Huawei FCC protocol
11:47:20 DEBUG [Worker 0] FCC: Initializing FCC session and sending request
11:47:20 DEBUG [Worker 0] FCC: Socket registered with epoll
11:47:20 DEBUG [Worker 0] FCC: Using local IP from interface eth1: 192.168.1.14
11:47:20 DEBUG [Worker 0] FCC (Huawei): Request (FMT 5) sent to server 10.7.35.172:8027 (local 192.168.1.14:46817)
11:47:20 DEBUG [Worker 0] FCC State: INIT -> REQUESTED (Request sent)
11:47:20 DEBUG [Worker 0] FCC (Huawei): Response received: result=1, type=3
11:47:20 DEBUG [Worker 0] FCC (Huawei): Server redirect to 10.7.35.199:8027 (redirect #1)
11:47:20 DEBUG [Worker 0] FCC State: REQUESTED -> INIT (Server redirect)
11:47:20 DEBUG [Worker 0] FCC: Initializing FCC session and sending request
11:47:20 DEBUG [Worker 0] FCC: Using local IP from interface eth1: 192.168.1.14
11:47:20 DEBUG [Worker 0] FCC (Huawei): Request (FMT 5) sent to server 10.7.35.199:8027 (local 192.168.1.14:46817)
11:47:20 DEBUG [Worker 0] FCC State: INIT -> REQUESTED (Request sent)
11:47:20 DEBUG [Worker 0] FCC (Huawei): Response received: result=1, type=2
11:47:20 DEBUG [Worker 0] FCC (Huawei): NAT traversal packet sent
11:47:20 DEBUG [Worker 0] FCC State: REQUESTED -> UNICAST_PENDING (Server accepted request)
11:47:20 DEBUG [Worker 0] FCC (Huawei): Waiting for unicast stream
11:47:20 DEBUG [Worker 0] FCC State: UNICAST_PENDING -> UNICAST_ACTIVE (First unicast packet received)
11:47:20 INFO [Worker 0] FCC: Unicast stream started successfully
11:47:29 DEBUG [Worker 0] FCC: Sync notification received - joining multicast
11:47:29 DEBUG [Worker 0] FCC State: UNICAST_ACTIVE -> MCAST_REQUESTED (Sync notification received)
11:47:29 INFO [Worker 0] Multicast: Successfully joined group
11:47:29 DEBUG [Worker 0] Multicast: Socket registered with epoll
11:47:30 DEBUG [Worker 0] FCC (Huawei): Termination packet (FMT 9) sent (normal flow), seqn=344
11:47:30 DEBUG [Worker 0] FCC: Normal termination message sent, term_seqn=342 (+2)
11:47:30 INFO [Worker 0] FCC: Switching to multicast stream (reached termination sequence)
11:47:30 DEBUG [Worker 0] FCC State: MCAST_REQUESTED -> MCAST_ACTIVE (Reached termination sequence)
11:47:30 DEBUG [Worker 0] FCC: Flushed pending buffer chain, total_flushed_bytes=43428
11:47:30 DEBUG [Worker 0] RTP packet loss detected - expected seq 1138, received 1143 (gap: 5 packets)
11:47:41 DEBUG [Worker 0] Client disconnected
11:47:41 DEBUG [Worker 0] FCC: Socket closed
11:47:41 DEBUG [Worker 0] RTSP: Cleanup called in state 0, skipping (already cleaning up or done)
11:47:41 DEBUG [Worker 0] RTSP: Session cleanup complete
11:47:41 DEBUG [Worker 0] Multicast socket closed
11:47:41 INFO [Worker 0] New client requested URL: /CCTV-1%E9%AB%98%E6%B8%85 (method: GET)
11:47:41 INFO [Worker 0] Service matched: CCTV-1高清
11:47:41 INFO [Worker 0] FCC: Using Huawei FCC protocol
11:47:41 DEBUG [Worker 0] FCC: Initializing FCC session and sending request
11:47:41 DEBUG [Worker 0] FCC: Socket registered with epoll
11:47:41 DEBUG [Worker 0] FCC: Using local IP from interface eth1: 192.168.1.14
11:47:41 DEBUG [Worker 0] FCC (Huawei): Request (FMT 5) sent to server 10.7.35.172:8027 (local 192.168.1.14:57464)
11:47:41 DEBUG [Worker 0] FCC State: INIT -> REQUESTED (Request sent)
11:47:41 WARN [Worker 0] FCC: Server response timeout (80 ms), falling back to multicast
11:47:41 DEBUG [Worker 0] FCC State: REQUESTED -> MCAST_ACTIVE (Signaling timeout)
11:47:41 INFO [Worker 0] Multicast: Successfully joined group
11:47:41 DEBUG [Worker 0] Multicast: Socket registered with epoll
11:47:42 DEBUG [Worker 0] RTP packet loss detected - expected seq 10328, received 10448 (gap: 120 packets)