Question about DV and D1 resolutions

Discussion in 'Professional Video Production' started by Geoff, Jul 25, 2003.

  1. Geoff

    Geoff Guest


    Here is another newbie question -- please be gentle.

    I'm going to be soon shooting using a MiniDV camera that shoots at 720x480.

    I've been requested that the final edited footage be at D1 resolution of
    720x486 using the CCIR 601 codec with pixel aspect of 0.9

    I'm planning to use FCP 3 to edit.

    Can someone explain the essential points about resoultion in simple
    terms? Looking at the numbers I immediately assume that I will loose
    resolution as I need to out put at greater resolution. But then I see
    that some programs, namely After Effects, allows one to put DV and D1
    footage togeher on the same timeline.

    I know that many broadcasters, I'm in Japan, use D1 resolutions, but
    accept materials shot on DV.

    Is capturing 720x480 at 720x486 straightforward?

    A quick simple explanation would be greatly appreciated.

    Geoff, Jul 25, 2003
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  2. Geoff

    Dave Guest

    I think that is an old standard to convert analog to digital. If you;re
    already doing digital I don't see the need to use it, you should be OK

    Dave Jones
    D&D Video Productions

    Camel: A horse designed by committee
    Dave, Jul 25, 2003
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  3. Geoff

    David McCall Guest

    It depends on the needs of the client. Likely they can accept DV,
    but only if they want to. Some stations and networks use the
    480 vs. 486 argument to separate the serious professionals from
    the "prosumers". So many people in the industry have bought into
    DV, that they may all be making exceptions by now, but you have
    to deliver what they ask for.

    You can not deliver DV at 720 x 486. those 6 extra lines just aren't there.
    In order to deliver at that size, you will need a format that actually conforms
    to the CCIR 601 standard. Options would be D1, Digital Betacam, or
    Betacam SP (along with 3/4, S-VHS, Perhaps even Hi-8, Standard 8,
    even VHS, but I wouldn't want to deliver on any of those, unless I had to.

    Even if you do deliver on one of these formats, the extra 6 lines will
    just be black, but at least it would conform to the broadcast standards.
    You could expand the image to fill out the entire raster, but that plays
    havoc with the interlace unless you use a program like Aftereffects that
    has the capability to "interpret footage", but then you will wind up with
    a slightly softer image.

    Since DV is likely your best available format, I would vote to just edit exactly
    as you would to deliver on DV. If they can't/won't accept DV, then take your
    DV tape to a dub house, and have them dub your video to the format of choice,
    or rent a deck to make your own dub. I would recommend going to a professional
    for the dub. They have the scopes, and knowledge, to make sure your video
    complies with the CCIR 601 standard.

    It would be best if they can keep it digital, but that may be hard to come by.
    2nd best would be to use analog component in the transfer to the approved
    broadcast format.

    David McCall, Jul 25, 2003
  4. Geoff

    Stuntman Guest


    DV25, DV50 and D1 all use non-square pixel aspect ratios. For DV it works
    out to NTSC 720 x 486 (scale factor of 0.9 wide). DV is essentially the
    same size as CCIR 601 image except two lines from the top and 4 from the
    bottom are omitted. This also conforms to ATSC's Standard Definition TV

    So to answer your question DV does meets your objective for image size

    Stuntman, Jul 26, 2003
  5. Geoff

    David McCall Guest

    I think you should work it out with them. If you are working with DV,
    your life will be much less complicated if you stay 720 x 480 for
    as much of the process as you can. Perhaps you could edit at 720 x 480,
    and then output to a DV file on the firewire drive. Then bring that file into
    Aftereffects, set "interpret footage" to lower field, create a new composition,
    drop your DV file into the new comp, and render to the desired file type.
    A QuickTime with very little compression might do it. You do have to consider
    field order though. You need to figure out what field order they will want, and
    if you should stretch to fill out the image to fill the frame, or just leave the
    top 2 and bottom 4 lines black. I've never gotten a straight answer about
    which field order Avid wants. If they can buy it as DV, it would save everybody
    a lot of hassle. It is guaranteed that your picture will not get better by going
    the extra generation. The only exception would be if you were going to do a
    lot of compositing with hard edged graphics. This could benefit, a little, from
    working uncompressed all the way, and then output a sequential set of files
    (I use the Targa format, but PNG is getting pretty popular). You could also
    output to a low compression QuickTime file (AVIs are possible, but there are
    so many different codecs, that it might be difficult to figure out which one.
    If time is going to be tight, I suggest you do a small test to be sure they can
    read your files.

    Good luck.

    David McCall, Jul 26, 2003
  6. Geoff

    Geoff Guest


    Thanks very much for all your great advice. Really. Actually I just
    reread what I wrote and realized I had meant to say that I was going to
    capture and edit at 720x480 not 486.

    Your advice is really appreciated.

    Thanks again,

    Geoff, Jul 26, 2003
  7. Geoff

    RGBaker Guest

    Not reallly. And I would be very startled at a client that wouldn't accept
    720x480 -- and I've delivered to some very fussy client. BBC, CBC,
    Discovery -- they have demanding technical standards, but 480 lines is a
    norm for Digital-S, DVCPro50, DVCam, DVCPro, DV & all the DVD family of SD
    recordings. If your client really is determined to get 486 lines, take your
    finished 480 line version to any dub house that will record to DigiBeta and
    have the program dubbed ...

    RGBaker, Jul 26, 2003
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