Add option to disable sequence for VISCA UDP

[neonconsultingllc]

Some PTZ cameras seem to not support UDP packets that contain the sequence part of visca. One example is the AKVANS AV-E20-NDI. I also have some LinkPi devices which can forward udp packets to a serial (visca) port, which does not work correctly when sequence part of packet is used.

For testing, I created a quick python script which removes anything before x81, then forwards on to the device.

import socket
import codecs
UDP_IP = "192.168.1.49"
UDP_PORT = 5000
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind((UDP_IP,UDP_PORT))
CAM_IP = "192.168.1.45"
CAM_PORT = 1259
cam_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
while True:
    data, addr = sock.recvfrom(2048)

    d=codecs.getencoder('hex')(data)
    s = None
    x = list()
    for i in range(0,d[1]):
        if hex(data[i]) == '0x81':
            s = i
        if s is not None:
           x.append(data[i])
    send = bytearray(x)
    print("%s -> %s" % ( data,send))
    cam_sock.sendto(send,(CAM_IP,CAM_PORT))

Quick example of output:

b'\x01\x00\x00\t\x00\x00\x00E\x81\x01\x06\x01\n\x08\x02\x02\xff' -> bytearray(b'\x81\x01\x06\x01\n\x08\x02\x02\xff')
b'\x01\x00\x00\t\x00\x00\x00F\x81\x01\x06\x01\x0b\t\x02\x02\xff' -> bytearray(b'\x81\x01\x06\x01\x0b\t\x02\x02\xff')
b'\x01\x00\x00\t\x00\x00\x00G\x81\x01\x06\x01\x00\x00\x03\x03\xff' -> bytearray(b'\x81\x01\x06\x01\x00\x00\x03\x03\xff')
b'\x01\x00\x00\t\x00\x00\x00H\x81\x01\x06\x01\x01\x01\x01\x01\xff' -> bytearray(b'\x81\x01\x06\x01\x01\x01\x01\x01\xff')
b'\x01\x00\x00\t\x00\x00\x00I\x81\x01\x06\x01\x02\x02\x01\x01\xff' -> bytearray(b'\x81\x01\x06\x01\x02\x02\x01\x01\xff')
b'\x01\x00\x00\t\x00\x00\x00J\x81\x01\x06\x01\x04\x03\x01\x01\xff' -> bytearray(b'\x81\x01\x06\x01\x04\x03\x01\x01\xff')
b'\x01\x00\x00\t\x00\x00\x00K\x81\x01\x06\x01\x05\x04\x01\x01\xff' -> bytearray(b'\x81\x01\x06\x01\x05\x04\x01\x01\xff')
b'\x01\x00\x00\t\x00\x00\x00L\x81\x01\x06\x01\x06\x05\x01\x01\xff' -> bytearray(b'\x81\x01\x06\x01\x06\x05\x01\x01\xff')
b'\x01\x00\x00\t\x00\x00\x00M\x81\x01\x06\x01\x07\x06\x01\x01\xff' -> bytearray(b'\x81\x01\x06\x01\x07\x06\x01\x01\xff')
b'\x01\x00\x00\t\x00\x00\x00N\x81\x01\x06\x01\x08\x07\x01\x01\xff' -> bytearray(b'\x81\x01\x06\x01\x08\x07\x01\x01\xff')
b'\x01\x00\x00\t\x00\x00\x00O\x81\x01\x06\x01\n\x08\x01\x01\xff' -> bytearray(b'\x81\x01\x06\x01\n\x08\x01\x01\xff')
b'\x01\x00\x00\t\x00\x00\x00P\x81\x01\x06\x01\x0b\t\x01\x01\xff' -> bytearray(b'\x81\x01\x06\x01\x0b\t\x01\x01\xff')
b'\x01\x00\x00\t\x00\x00\x00Q\x81\x01\x06\x01\x0c\n\x01\x01\xff' -> bytearray(b'\x81\x01\x06\x01\x0c\n\x01\x01\xff')
b'\x01\x00\x00\t\x00\x00\x00R\x81\x01\x06\x01\x00\x00\x03\x03\xff' -> bytearray(b'\x81\x01\x06\x01\x00\x00\x03\x03\xff')
b'\x01\x00\x00\x05\x00\x00\x00S\x81\x01\x06\x04\xff' -> bytearray(b'\x81\x01\x06\x04\xff')

It would be great to have an option to "Disable sequence" when configuring a camera to use VISCA UDP, which drops anything before x81

[normen]

Can confirm, given the bugs in the serial port implementation and some of my cameras having some specialties in the VISCA implementation anyway I created a bridge app so I can massage the data. The easiest way in your case I suppose would ba making a super small app that just opens a TCP server and connects that to the camera UDP, which is basically what I am doing. The TCP-Visca that OBS-PTZ outputs is basically what you want.