Capture card starting from line 22

[bakonfreek]

I was wondering if I could get a model recommended. I have a JVC BR-S822 but I have been told that if I want to get rid of head switching noise, I have to use a capture card that captures starting from line 22. I've been looking around off and on but I can't seem to find anything (looking on Google, I keep getting dates or times with "22" in them even when I quote "line 22").

Thanks in advance.

[manono]

Just cover it with black or crop it away after capturing. The person recommending this approach didn't also recommend a capture card to use?

[bakonfreek]

The person recommending this approach didn't also recommend a capture card to use?

Unfortunately no. He just gave me the technical crap.

[Skiller]

Starting at line 22 isn't necessarily going to "fix" it either. What it's supposed to do is take the topmost 480 lines out of the (up to) 486 lines the analog picture may occupy, therefore cutting the bottom where the switch noise is.

However, head switch noise is often taller than 6 lines and it's rather unlikely the top lines contain picture, so all you get is a picture shifted downwards with new but useless black lines introduced at the top.

Forget about that approach. Just cover the head switch lines with solid black.

[Brad]

bakonfreek: Are you referring to http://avaa.bavc.org/artifactatlas/index.php/Head_Switching_Noise ? The workflow information is provided in the image filenames.

Skiller: Line 22 usually does contain picture except when pre-processed by a 480i device instead of true 525i.

https://forum.videohelp.com/threads/359668-Anyone-use-a-DVD-recorder-s-passthrough-with...apture-devices (this is a partial list of line 22 cap devices*; some info may be wrong however)

I realized later that the reason the DVD recorders "blank" the top two lines is that they all adhere to the same SMPTE standard framing for MPEG-2. Line 22 of each field isn't so much blanked as it is that the active picture digitization by the recorder doesn't really begin until line 23.

* The DV ones only start with line 22 of one field, not both.

[pandy]

Most of older capture card based on Brooktree/Conexant chips are capable to capture normally not active video lines.