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DV compression JAGGED LINES

Discussion in 'Camcorders, Action Cams & Video Editing Forum' started by Leerock, Apr 5, 2005.

  1. Leerock

    Leerock
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    Hi guys
    I got the sony pc105 ntsc and i m very please with it s performance.

    Aften capturing the dv to my pc it plays fine which means there is nothing wrong with the camcorder.

    But when i compress the dv to mpeg2 for dvd transfer,
    I get some jagged horizontal lines especially on movement.
    I think it s some kind of hmmmmm heavy aliasing.
    I ve used many dv editing/encoding programs like pinnacle studio, ulead videostudio canopus procoder, mainconcept encoder, and i get the same effect.
    I ve tried setting the output to deinterlace but nothing happens.

    Anyone found the same problem?

    Ppplz guys help me coz this is very annoying. :suicide:
     
  2. vonhosen

    vonhosen
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    Is this problem viewed on your PC monitor played back from hard drive or authored DVD ?

    Is it seen when viewed on TV from authored DVD ?

    You say you are capturing NTSC are you in UK ?

    Are you converting NTSC to PAL before authoring to DVD ?

    If you are playing back NTSC DVDs you have authored does your DVD player & TV support NTSC natively or is it displaying PAL60 ?
     
  3. Leerock

    Leerock
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    Yes I can see it when it s played back on my pc monitor.
    I haven t burned it to a dvd yet coz it looks terrible.

    I m capturing ntsc coz my camera is ntsc.
    I ve bought it from US.

    No I m not converting ntsc to pal coz of the different frame rate.

    So you think that this is weird?
     
  4. vonhosen

    vonhosen
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    Try burning to a DVD & see what it looks like on TV.

    Let us know the outcome.
     
  5. BadAss

    BadAss
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    I see lines like this too but it only appears in the preview window. Once burnt to DVD all lines are gone.
     
  6. Leerock

    Leerock
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    Hmmm
    That sounds soothing
    I ll try to burn it to dvd and see what happens


    thanks a lot for your help guys :smashin:

    EDIT: Ooohhhh and another think
    Is it necessary to set the compression mode to deinterlace?
     
  7. vonhosen

    vonhosen
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    In what software ?

    I always prepare MPEG files as interlaced if from DV.
    Even commercial DVD discs are natively interlaced component.
     
  8. Leerock

    Leerock
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    Thanks a lot

    I ve burnt a dvd and it plays fine.

    Thanks again
     
  9. Darren Blake

    Darren Blake
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    The jagged edge you are seeing is because the native DV format shows both the top and bottom fields from a single frame together. Because one field is shown 1/25th of a second after the other, if there is any motion in betwen the two then when they are displayed together this motion shows up as "tearing". It depends on whether the final format will be interlaced or non-interlaced as to whether you need to do anything about this or not.

    First of all, as you have probably already guessed, MPEG2 on DVD is designed to work with interlaced material, so the issue resolves itself.

    If, for examle, you wanted to make a VCD (MPEG1) then you would first have to de-interlace the DV format video in an editing package. You can do this by either opting to dump the top or bottom fields, or (better in my opinion) interpolate a composite frame using both fields.

    HTH.
     
  10. gipo

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    I'm having a similar problem what exactly should be done about the interlacing/de-interlacing. Any dvds Ive tried always have these jagged edges to objects especially when moving
     
  11. Darren Blake

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    Are you watching them on your PC or on a TV?
     
  12. gipo

    gipo
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    both
     
  13. gipo

    gipo
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    I should say its on the authored dvd when i play it on both. The raw footage is ok.
     
  14. vonhosen

    vonhosen
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    Is the raw footage analogue or DV ?
     
  15. gipo

    gipo
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    DV digital 8
     
  16. Darren Blake

    Darren Blake
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    That's cerrrr-azy. DV is interlaced and should look jagged when you play it on your PC.

    ...I take it you have looked at the raw footage on your PC? I don't mean by plugging your camcorder into an analogue capture card and looking at it as a direct picture feed. I mean by downloading the actual DV file off your camcorder and into your PC as an AVI file and then watching that through Media Player or something?

    Actually, can you give an overview of the whole process, from capture to final DVD, showing how you move the files about and what software / Hardware you use?
     
  17. vonhosen

    vonhosen
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    The only other time I've seen jagged jumpy motion in movement is when the file is labelled with incorrect field order.

    DV captured through firewire is lower field first.
    Analogue is dependent on the capture device as to whether it is upper or lower field.
    To be honest it is not important whether it is upper or lower field , what is important is that it correctly labelled through out or you will end up with very jumpy video in motion sequences that will not look anywhere near as bad in still or low motion scenes.

    Perhaps try changing field order (not output but input flag to your editing software/encoder).
     
  18. gipo

    gipo
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    Its ok Ive found the problem, the settings of the camera were wrong. :oops: Successfully created dvd last night. I cant believe this is what was wrong as Ive being a week trying to figure it out. Sorry for time wasting. :suicide:
    Ps Whats the best 12 bit or 16 bit sound when recording?
     
  19. vonhosen

    vonhosen
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    I always use 16 bit which gives you two channels of audio.

    12 bit gives your further channels for say commentary, but IMHO you are better using the extra quality of 16bit & then use your editing software to add commentray etc later if you wish.
     

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