A couple of days ago I submitted a patch for the HVR-1300 to fix a problem where the s-video would have the comb filter enabled even when capturing on s-video. This caused distortion of the video, as Florent Audebert pointed out on the linux-media mailing list. The weird thing is that it only happened when capturing on MPEG, which ultimately was a bug where the input was getting switched whenever the cx88 driver started up the MPEG encoder.
The patch can be found here:
Thanks to Anevia S.A. for sponsoring the fix to this issue.