Cropping with Hauppauge HVR-1900

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Hello,

I have a Hauppauge HVR-1900 which works fine with the pvrusb2 driver.
However because most TV channels now air with 16:9 content inside 4:3
images, I would like to crop out the top and bottom black bars before
encoding via the hardware MPEG2 encoder. I tried using the ctl_crop_top
and ctl_crop_height in  /sysfs as well as the --set-crop option of
v4l2-ctrl but only received error messages indicating a value out of range.

The card has a cx25843 which should support cropping. Does anyone know
how to get this feature to work ?

Thanks in advance for the help,

Joseph
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