Generating BT.656 from QVGA 320x240 YUV(4:2:2) ?

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Hi Folks

Is is possible to generate ITU-R BT.656 data stream from
QVGA 320x240 YUV(4:2:2) Video format ?
OR
how to send QVGA 320x240 YUV(4:2:2) Video format via BT.656

Active video resolutions for BT.656 are 720 x 576 for (625/50 video
systems)
where as in case of QVGA its 320x240

So is it possible to add some padding / blank video pixels at the end
of
320 horizontal samples to make it to 720 horizontal samples needed for
BT656

8-bit samples of QVGA 320x240 YUV(4:2:2) Video format are directly
available from IIDC 1393 based digital camera, so whats creating the
trouble is how to construct BT.656 one line data from it.

Please share you ideas / Provide Comments .