FORUMS: list search recent posts

HELP digitzing 640x480.....

COW Forums : AJA Video Systems

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
mellogrfx
HELP digitzing 640x480.....
on Sep 6, 2007 at 12:43:48 pm

OK...here's the problem I have. We have programs that were edited and mastered to beta ,via an old media 100 system, at 640x480. I need to make DVD projects using these 640x480 programs....I have tried to digitize at 640x480 using the AJA IO LA with zero luck. I have tripled check ALL my settings and the IO still digitizes at 720x486...WHY? Normally I don't mind the wide look on the talking heads but this client will be ticked-off if he sees his head stretched wider than a football. Is the problem in FCP or IO? please help.

thnx in advanced


Return to posts index

msacci
Re: HELP digitzing 640x480.....
on Sep 6, 2007 at 11:51:32 pm

If they are on a Beta Tape they should be back to 720x480. Try just capturing them as normal and see if they look correct.


Return to posts index

Arniepix
Re: HELP digitzing 640x480.....
on Sep 7, 2007 at 2:53:28 pm

[mellogrfx] "I have tripled check ALL my settings and the IO still digitizes at 720x486...WHY?"

Because it's supposed to. According to SMPTE, the NTSC, the ITU, etc, NTSC D1 video is 720X486, not 640X480. There's an explination of anamorphic vs square pixels in your FCP manual.

IOW, your Io is acting correctly & conforming to industry standards & specs.


Return to posts index


rborroto
Re: HELP digitzing 640x480.....
on Sep 16, 2007 at 1:14:08 pm

The pixel dimension subject can be very confusing. The thing to remember is that video content on analog Betacam tape is 4x3 aspect ratio, or anamorphic (for display on 16x9 screens, but let's not discuss that can of worms here). In the digital world, 4x3 aspect ratio comes in many flavors. DV (non-square) pixel aspect ratio is 0.9 for a 4x3 image, and 1.2 for a 16x9 image, both 720x480. The difference is the pixel size itself, not the pixel dimensions. Uncompressed 4x3 video has a pixel dimension of 720x 486. If you capture analog Betacam at those pixel dimensions you'll be OK. 640x480 is a square pixel flavor of 4x3 video, which was the world of the old Media 100 system. One thing to note, if you're planning on making a DVD from 720x486 digital video you need to crop off 6 horizontal pixels in your compressor BEFORE making the DVD, because DVD pixel dimensions are 720x480 (0.9 or 1.2 pixel aspect, depending on whether the DVD is 4x3 or widescreen 16x9, respectively). Those 6 extra pixels will give you jittery video on the DVD if they're not cropped off at the compressor. Apple's Compressor application crops off 4 pixels and 2 pixels top and bottom, automatically, when you bring in 720x486 video. THAT'S VERY IMPORTANT...

Good luck!


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]