tvtimetvtime is the easiest to use application for analog TV, composite and svideo
sudo apt-get install tvtime
with mediaclient you can identify your device, please note that VDR must be stopped in order to be able to use analog TV and FM radio again.
$ /opt/bin/mediaclient -e
**** List of Media Hardware Devices ****
device 0: [ Sundtek MediaTV Pro] DVB-C, DVB-T, ANALOG-TV, FM-RADIO, REMOTE-CONTROL
...
[ANALOG-TV]:
VIDEO0: /dev/video1
VBI0: /dev/vbi0
...
$ tvtime -d /dev/video1