The bitrate of the teletext PID in DVB depends on multiple settings.

🟢 Reserved teletext bitrate

The reserved bitrate is the maximum gross bitrate (including stuffing packets) which can be set for every teletext TS output in the DVB Configuration program.

However the „Reserved bitrate“ is only a reserve. It is not used for determining the actual transmission bitrate for teletext. It shall be set to 300 kbit/s. The net teletext bitrate on FAB output will never use 300 kbit/s.

🔵 Actual teletext bitrate

The actual teletext bitrate depends on configuration of teletext VBI lines. The lowest one is about 50 kbit/s using the following configuration:

The next lowest one is about 100 kbit/s using the following configuration:

🟡 Measuring the teletext bitrate

To measure the gross and net bitrate of a PID the program TSDuck from https://tsduck.io can be used under Windows with this command line (the first IP is the IP of the ethernet adapter that shall be used):

"c:\Program Files\TSDuck\bin\tsp.exe" --verbose -I ip -l 192.168.211.100 239.192.1.250:1234 -P filter --pid 482 -P until --seconds 10 -P bitrate_monitor -p 1 -O drop

The program will display the bitrate in this way:

C:\Users\fab>"c:\Program Files\TSDuck\bin\tsp.exe" --verbose -I ip -l 192.168.211.100 239.192.1.250:1234 -P filter --pid 482 -P until --seconds 10 -P bitrate_monitor -p 1 -O drop
* ip: joining multicast group 239.192.1.250 from local address 192.168.211.100
* ip: unknown initial input bitrate
* bitrate_monitor: 2025/07/22 12:48:55, TS bitrate: 132,136 bits/s, net bitrate: 132,136 bits/s
* bitrate_monitor: 2025/07/22 12:48:56, TS bitrate: 133,598 bits/s, net bitrate: 133,598 bits/s
* bitrate_monitor: 2025/07/22 12:48:57, TS bitrate: 132,222 bits/s, net bitrate: 132,222 bits/s
* bitrate_monitor: 2025/07/22 12:48:58, TS bitrate: 132,238 bits/s, net bitrate: 132,238 bits/s
* ip: leaving multicast group 239.192.1.250 from local address 192.168.211.100

This page was last updated on 2025-07-22