8 Replies Latest reply: Aug 23, 2012 5:26 AM by N H H
N H H Level 1 Level 1 (30 points)

Hello.

 

Wondered if anyone could shed any light on this ...

 

Home movie transferred from Super 8 to VHS then to DVD,

extracted from DVD to hard drive at same frame rate and same aspect ratio.

 

Footage loaded into iMovie HD and edited, then back out to iDVD.

 

In iMovie, the footage ran smoothly and as expected, but once burnt onto disc from iDVD, wobbly / ripple distortion appears on the footage -

especially noticeable on scenes with lots of movement on screen.

 

Have re-tracked stages and have followed frame rate and aspect ratio all along so no idea about this one.

 

Anyone? ...


Mac Pro (Early 2008), Mac OS X (10.5.8)
  • Klaus1 Level 8 Level 8 (46,495 points)

    What you are seeing is interlacing.

     

    extracted from DVD to hard drive at same frame rate and same aspect ratio.

    Exactly how did you do that?

  • N H H Level 1 Level 1 (30 points)

    I extracted using iSkysoft iMedia Converter (which is excellent, incidentally, and an excellent price).

     

    Do you have any idea why the interlacing should or has occurred? - and at which stage.

     

    As mentioned, the footage looked okay in iMovie (whilst editing).

  • Klaus1 Level 8 Level 8 (46,495 points)

    What format did you convert it to before sending it to iDVD?

  • N H H Level 1 Level 1 (30 points)

    (sorry for the delay)

     

    DVD (4:3) extracted to Quicktime format (same aspect and frame rate)

    Quicktime to iMovie (DV PAL 4:3)

    iMovie to iDVD

  • Bengt Wärleby Level 6 Level 6 (19,450 points)

    Hi

     

    You are much better of - jumping the DVD step - If You have the VHS tapes.

     

    Then use a VHS-VCR-player and

    • A/D-box - or -

    • Camera with analog in and Digital out - to tape or via Video trough function (if it got this)

     

    Then You omit the quality losing steps

    • Converting to DVD (Costa a lot of Quality)

    • Converting back to Digital (I prefere streamingDV .dv) - (Even worse Quality loss)

     

    If You got no economical limit - then do as I (tough bite)

    • Canopus ADVC-300 (now Grass Valley ADVC-300) as this both enhanze the pictura and mend minor error in the timecode = no halt and Aundi keeps in sync.

     

    Yours Bengt W

  • N H H Level 1 Level 1 (30 points)

    Thanks Bengt, I do appreciate the more steps involved, the worse the quality can become.

     

    However, I do want to find out at which point the 'wobbles' were introduced and so far I can't find an answer anywhere.

  • Bengt Wärleby Level 6 Level 6 (19,450 points)

    Most probably (me wildly guessing) it occurs in two steps

     

    frame rates

    • frame rate on Super 8 Projectors (Cameras) most often were 18fps (some Cameras can record in 24fps)

     

    • then miniDV tape is either 25fps or 29.97fps - introduce drop down frames - most often in a bad way

     

    • then if Your project is set in other fps e.g. miniDV (25fps PAL) and iMovie (29.97fps NTSC) - then even more artifact is introduced (same other way around - or even worse)

     

    iMovie'08 to 11 - line discarding process

    • when moving events to project - iMovie discard every second line in the picture resulting in even more quality loss

     

    iMovie up to HD6 and FinalCut doesn't harm in that way.

     

    So best possibly result is

     

    Movie Scanner to Video editor without any in between steps and all set in proper frame rate (and as few conversions needed)

     

    VHS to A/D-box to iMovie HD6 to iDVD - Give best possibly DVD to most of us.

     

    Yours Bengt W

  • N H H Level 1 Level 1 (30 points)

    Interesting.

     

    I'm not sure why I'm getting this though, having gone ...

     

    DVD 720x576 25FPS extract to HD (Quicktime format) at 720x576 25FPS

    Quicktime to iMovie at 4:3 dv format at 25FPS to eventually iDVD

     

    Again, I do appreciate the VHS direct to iMovie route would be better.