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'noise' bars on low level video

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  • 'noise' bars on low level video

    Dear Anyone,

    I am doing a lot of transfers from VHS to DV via an ADVC300 and the output is generally very good but I have noticed with low level video signals quite distinct horizontal lines of 'noise' are apparant across the whole picture when viewed, after encoding to DVD on a TV.

    Do you think my settings are wrong or a fault somewhere?

    Spec: Panasonic VHS, ADVC300 (latest firmware), Edius 4.6

  • #2
    Can you show us a screen capture so we can see exactly what it is?

    Ken.

    Comment


    • #3
      Originally posted by Mithras View Post
      Dear Anyone,

      I am doing a lot of transfers from VHS to DV via an ADVC300 and the output is generally very good but I have noticed with low level video signals quite distinct horizontal lines of 'noise' are apparant across the whole picture when viewed, after encoding to DVD on a TV.

      Do you think my settings are wrong or a fault somewhere?

      Spec: Panasonic VHS, ADVC300 (latest firmware), Edius 4.6
      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
      Anton Strauss
      Antons Video Productions - Sydney

      EDIUS X WG with BM Mini Monitor 4k and BM Mini Recorder, Gigabyte X299 UD4 Pro, Intel Core i9 9960X 16 Core, 32 Threads @ 4.3Ghz, Corsair Water Cooling, Gigabyte RTX-2070 Super 3X 8GB Video Card, Samsung 860 Pro 512GB SSD for System, 8TB Samsung Raid0 SSD for Video, 2 Pioneer BDR-209 Blu-ray/DVD burners, Hotswap Bay for 3.5" Sata and 2.5" SSD, Phanteks Enthoo Pro XL Tower, Corsair 32GB DDR4 Ram, Win10 Pro

      Comment


      • #4
        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?

        Comment


        • #5
          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.

          Comment


          • #6
            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.

            Comment


            • #7
              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; 06-10-2008, 12:51 AM.

              Comment


              • #8
                Yowsa!

                You're using good quality, shielded analogue cables?

                Comment


                • #9
                  do other VHS tapes capture ok with your setup?
                  Anton Strauss
                  Antons Video Productions - Sydney

                  EDIUS X WG with BM Mini Monitor 4k and BM Mini Recorder, Gigabyte X299 UD4 Pro, Intel Core i9 9960X 16 Core, 32 Threads @ 4.3Ghz, Corsair Water Cooling, Gigabyte RTX-2070 Super 3X 8GB Video Card, Samsung 860 Pro 512GB SSD for System, 8TB Samsung Raid0 SSD for Video, 2 Pioneer BDR-209 Blu-ray/DVD burners, Hotswap Bay for 3.5" Sata and 2.5" SSD, Phanteks Enthoo Pro XL Tower, Corsair 32GB DDR4 Ram, Win10 Pro

                  Comment


                  • #10
                    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.

                    Comment


                    • #11
                      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.

                      Comment


                      • #12
                        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
                        Anton Strauss
                        Antons Video Productions - Sydney

                        EDIUS X WG with BM Mini Monitor 4k and BM Mini Recorder, Gigabyte X299 UD4 Pro, Intel Core i9 9960X 16 Core, 32 Threads @ 4.3Ghz, Corsair Water Cooling, Gigabyte RTX-2070 Super 3X 8GB Video Card, Samsung 860 Pro 512GB SSD for System, 8TB Samsung Raid0 SSD for Video, 2 Pioneer BDR-209 Blu-ray/DVD burners, Hotswap Bay for 3.5" Sata and 2.5" SSD, Phanteks Enthoo Pro XL Tower, Corsair 32GB DDR4 Ram, Win10 Pro

                        Comment


                        • #13
                          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?

                          Comment


                          • #14
                            There are two types of correction - ADVC300 only supports line (field) TBC.

                            A full frame TBC may be what is required here.

                            Comment


                            • #15
                              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.

                              Comment

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