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'noise' bars on low level video

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  • GrassValley_BH
    replied
    Also move the ADVC away from other equipment (like the TV and VCR).

    Leave a comment:


  • francoe
    replied
    Mmm, i think you need to try turning off all equipment around the pc.
    Thats not a TBC problem, seems like an parasite interference.

    Leave a comment:


  • Mithras
    replied
    Originally posted by kbosward View Post
    In my opinion I don't think a separate TBC is going to improve the noise you are seeing. A full-frame TBC is great at fixing jittery video, but that doesn't seem to be the case in your example image. (Unless you get what Anton is thinking about which is an expensive S-VHS player that has built-in TBC and noise reduction.)

    But have you tried adjusting the settings on your ADVC300? They are there, so use them! Try fiddling with the settings under the Filter tab.

    Ken.
    Thanks. I will try some fiddling and I'll try and come to some conclusion.
    When I work it out I will post the solution! (hopefully)

    Leave a comment:


  • kbosward
    replied
    In my opinion I don't think a separate TBC is going to improve the noise you are seeing. A full-frame TBC is great at fixing jittery video, but that doesn't seem to be the case in your example image. (Unless you get what Anton is thinking about which is an expensive S-VHS player that has built-in TBC and noise reduction.)

    But have you tried adjusting the settings on your ADVC300? They are there, so use them! Try fiddling with the settings under the Filter tab.

    Ken.

    Leave a comment:


  • GrassValley_KH
    replied
    There are two types of correction - ADVC300 only supports line (field) TBC.

    A full frame TBC may be what is required here.

    Leave a comment:


  • Mithras
    replied
    Originally posted by antonsvideo View Post
    a TBC with NR would fix this

    also, if you find an S-VHS player with S-Video out, you will also get far less noise
    I thought the ADVC 300 had a built in TBC?

    Leave a comment:


  • antonsvideo
    replied
    a TBC with NR would fix this

    also, if you find an S-VHS player with S-Video out, you will also get far less noise

    Leave a comment:


  • Mithras
    replied
    Originally posted by antonsvideo View Post
    do other VHS tapes capture ok with your setup?
    If the video level is high, the bar effect isn't visible at all. It's just in low level areas that the noise bars appear.

    Leave a comment:


  • Mithras
    replied
    Originally posted by GrassValley_KH View Post
    Yowsa!

    You're using good quality, shielded analogue cables?
    I know this is a very poor quality bit of video. Try to look past the noise of the picture .... that is my point. The noise I would have expected to be even across the frame but it seems to have a distinct bar effect.

    Leave a comment:


  • antonsvideo
    replied
    do other VHS tapes capture ok with your setup?

    Leave a comment:


  • GrassValley_KH
    replied
    Yowsa!

    You're using good quality, shielded analogue cables?

    Leave a comment:


  • Mithras
    replied
    Here is the image - I hope!

    It looks very subtle on the still but on the moving image the banding is very noticable. The Puma's back shows it off the best I think. Looks a bit more magenta than the rest of the picture.
    Any ideas?
    Attached Files
    Last edited by Mithras; 06-09-2008, 11:51 PM.

    Leave a comment:


  • GrassValley_KH
    replied
    Originally posted by Mithras View Post
    How can I do this? Do you know of a free site I can upload an image too?
    When replying, click the "Go Advanced" button, and then add an attachment with the "Manage Attachments" button.

    There is no resolution restriction on most image file types, so just keep it under half a megabyte and it will be fine. I recommend PNG as the choice of image format for screenshots.

    Leave a comment:


  • Mithras
    replied
    Originally posted by antonsvideo View Post
    the noise bars you see are normal and are part of every VHS, these are the head switching point lines and are usually hidden by the overscan of the TV but will be seen in PC monitor for sure or LCD or Plasma TV if overscan is not set large enough

    to avoid that, you can crop these lines in your mpeg encoding software
    Sorry I have been a bit vague. the noise bars are over the whole picture. Quite subtle at normal viewing distances but once you notice them you start seeing them all the time. I will try to give you an example once I work out how to ftp a frame grab from the timeline.

    Leave a comment:


  • Mithras
    replied
    Originally posted by kbosward View Post
    Can you show us a screen capture so we can see exactly what it is?

    Ken.
    How can I do this? Do you know of a free site I can upload an image too?

    Leave a comment:

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