I found out how I could check the IVTV configuration: /home/mythtv$ v4l2-ctl --all. The output is:
Driver Info:
Driver name : cx8800
Card type : Hauppauge WinTV-HVR1300 DVB-T/H
Bus info : PCI:0000:00:08.0
Driver version: 6
Capabilities : 0x05010011
Video Capture
VBI Capture
Tuner
Read/Write
Streaming
Format Video Capture:
Width/Height : 320/240
Pixel Format : BGR3
Field : Interlaced
Bytes per Line: 960
Size Image : 230400
Colorspace : Unknown (00000000)
Format VBI Capture:
Sampling Rate : 35468950 Hz
Offset : 244 samples (6.87926e-06 secs after leading edge)
Samples per Line: 2048
Sample Format : GREY
Start 1st Field : 6
Count 1st Field : 17
Start 2nd Field : 318
Count 2nd Field : 17
Video input : 0 (Television)
Frequency: 0 (0.000000 MHz)
Video Standard = 0x000000f7
PAL-B/B1/G/I/D/D1/K
Tuner:
Capabilities : 62.5 kHz multi-standard
Frequency range : 0.0 MHz - 268435455.9 MHz
Signal strength : 0%
Current audio mode : mono
Available subchannels: 1