Setting Resolution on Capture Devices - Convert setting

[Warmbeers]

I'd like to be able to capture and convert the video/audio from my FIOS Settop Box / DVR and control the Resolution.
I am using a Dazzle 100 and i can capture the video thru the card, but as noted in the Hardware Compatibility list the sound does not come thru so i went directly to the line in of the computer and that seems to work fine.

What i would like to know is if it is possible to set the resolution on the incoming stream. The device specs say Dazzle supports 160x120 up to 720x526. but i am consistently getting either 352 X 240 , 352 X 288 or the details in the file properties don't indicate the resolution if i make changes to either the scale or the frame width in the Profile / Video / Resolution tab?

Is there some setting in the process of setting up the Capture Device / Convert that will drive the resolution to something like 480 X 480? There is a bit rate setting and a quality setting but they seem to be mutually exclusive. I've used 512 kbps and 800 kbps but in the small size it does not work for me. Not clear what the range of the Quality setting is or what it might correspond to.
TIA for any help, greatly appreciated.
ed

[Rémi Denis-Courmont]

You need to select the intended format in the open dialog (or within the MRL string). Convert tab is too "late" for what you want to achieve.