mpv works. There are some messages on console but work.
VLC still does not. 
$ sudo tshark port 554
Running as user “root” and group “root”. This could be dangerous.
Capturing on ‘wlp5s0’
1 0.000000000 192.168.178.68 → 192.168.178.1 TCP 74 53584 → 554 [SYN] Seq=0 Win=64240 Len=0 MSS=1460 SACK_PERM=1 TSval=3304882495 TSecr=0 WS=128
2 0.002030887 192.168.178.1 → 192.168.178.68 TCP 74 554 → 53584 [SYN, ACK] Seq=0 Ack=1 Win=28960 Len=0 MSS=1460 SACK_PERM=1 TSval=1236026885 TSecr=3304882495 WS=128
3 0.002052249 192.168.178.68 → 192.168.178.1 TCP 66 53584 → 554 [ACK] Seq=1 Ack=1 Win=64256 Len=0 TSval=3304882498 TSecr=1236026885
4 0.002073724 192.168.178.68 → 192.168.178.1 RTSP 282 OPTIONS rtsp://192.168.178.1:554/?avm=1&freq=218&bw=8&msys=dvbc&mtype=256qam&sr=6900&specinv=0&pids=0,16,17,18,20,268,623,624,628 RTSP/1.0
5 0.005244085 192.168.178.1 → 192.168.178.68 TCP 66 554 → 53584 [ACK] Seq=1 Ack=217 Win=30080 Len=0 TSval=1236026889 TSecr=3304882498
6 0.006343448 192.168.178.1 → 192.168.178.68 RTSP 144 Reply: RTSP/1.0 200 OK
7 0.006350485 192.168.178.68 → 192.168.178.1 TCP 66 53584 → 554 [ACK] Seq=217 Ack=79 Win=64256 Len=0 TSval=3304882502 TSecr=1236026889
8 0.006400201 192.168.178.68 → 192.168.178.1 RTSP 308 DESCRIBE rtsp://192.168.178.1:554/?avm=1&freq=218&bw=8&msys=dvbc&mtype=256qam&sr=6900&specinv=0&pids=0,16,17,18,20,268,623,624,628 RTSP/1.0
9 0.010575846 192.168.178.1 → 192.168.178.68 TCP 283 554 → 53584 [PSH, ACK] Seq=79 Ack=459 Win=31104 Len=217 TSval=1236026893 TSecr=3304882502 [TCP segment of a reassembled PDU]
10 0.010592728 192.168.178.68 → 192.168.178.1 TCP 66 53584 → 554 [ACK] Seq=459 Ack=296 Win=64128 Len=0 TSval=3304882506 TSecr=1236026893
11 0.012718095 192.168.178.1 → 192.168.178.68 RTSP/SDP 277 Reply: RTSP/1.0 200 OK
12 0.012725335 192.168.178.68 → 192.168.178.1 TCP 66 53584 → 554 [ACK] Seq=459 Ack=507 Win=64000 Len=0 TSval=3304882508 TSecr=1236026895
13 0.013014254 192.168.178.68 → 192.168.178.1 RTSP 341 SETUP rtsp://192.168.178.1:554/?avm=1&freq=218&bw=8&msys=dvbc&mtype=256qam&sr=6900&specinv=0&pids=0,16,17,18,20,268,623,624,628/stream=1 RTSP/1.0
14 0.018074760 192.168.178.1 → 192.168.178.68 RTSP 235 Reply: RTSP/1.0 200 OK
15 0.018096059 192.168.178.68 → 192.168.178.1 TCP 66 53584 → 554 [ACK] Seq=734 Ack=676 Win=64000 Len=0 TSval=3304882514 TSecr=1236026901
16 0.018229462 192.168.178.68 → 192.168.178.1 RTSP 224 PLAY rtsp://192.168.178.1:554/stream=1 RTSP/1.0
17 0.024774801 192.168.178.1 → 192.168.178.68 RTSP 153 Reply: RTSP/1.0 200 OK
18 0.066693556 192.168.178.68 → 192.168.178.1 TCP 66 53584 → 554 [ACK] Seq=892 Ack=763 Win=64128 Len=0 TSval=3304882562 TSecr=1236026907
It seems the connection gets stuck.