# Multiple cards, one program source
If your system contains multiple video sources 
(in my case: ziggo-digital and ziggo-analog)
but you have a single source for the programmes 
(in my case tv\_grab\_nl\_py) then you probably want
that the program listing is combined: one line
per channel.

To accomplish this, the following items must be equal
for the channels in the different video-sources:

* the callsigns
* the channel numbers
* the xmltv id

See also: [grabbing](../grabbing)
