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jononono
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pixel aspect ratio cofusion

May 19, 2013 9:23 AM

HI, I have a heap of digibeta footage digitised using black magic.

It is widescreen 16x9, 720x576 PAL. however on inspection of the properties, the .mov file has pixel aspect ratio is shown as 1.0940.

In after effects, if the footage was interpreted to be widescreen pixels (1.4587) it would then appear in its orgnal propotions on screen.

However, in Premiere when the pixel aspect ratio is interpreted as widescreen two vertical black bars are added to the sides of the footage, which retains its squashed appearence

Obviously I'm missing something, but ive been searching now for 2 hours and cant seem to find any clues?

 
Replies
  • Currently Being Moderated
    May 19, 2013 1:53 PM   in reply to jononono

    What versions of PP and AE?

     
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    May 19, 2013 6:20 PM   in reply to jononono

    Odd.  I would have expected them to work the same.

     
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    May 21, 2013 3:30 PM   in reply to jononono

    What is your sequence size?

    Widescreen SD PAL is not the same ratio as HD Widescreen thus you end up with tiny black bars on the edges if you drop a SD widescreen on a HD sequence and scale it up.

    i.e.

    720x576 @ 1.4587:1 PAR = 1050.264x576 = 1.823375:1

    1280x720 @ 1:1 PAR = 1.7777:1

    1920x1080 @ 1:1 PAR = 1,7777:1

     
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    May 22, 2013 9:58 PM   in reply to jononono

    the footage remains 'squashed' in 4x3.

     

    Even after Interpreting?

     
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    May 22, 2013 10:22 PM   in reply to Jim Simon

    That is so odd.

    My only assumption is that because it is mov that it uses the QuickTime importer vs the native ones.

    I know that QuickTime relies/chooses on the mov information over that of the stream information. So if the mov container says its 4:3 (1.0940:1) and the stream says it is 16:9 then Premiere will interpret it as 4:3 and box it in a 16:9 sequence.

    AE on the other hand might not take this code path and thus gets it right.

    That's just a guess though

    What does MediaInfo (PC) or Media Inspector (Mac) say?

     

    Having said that there really isn't a good way to fix the problem other than stretching it in the clip scaling width/height settings if the interpret is wrong.

     
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    May 24, 2013 9:12 PM   in reply to Rallymax-forum

    Another post about this here http://forums.adobe.com/message/5259586#5259586

    I posted there and then like the original poster I too had to totally reinstall for interpret footage to start working again. Now only a month later I'm in the same boat again.  Frustrating.  The file i'm using is an AVI, not mov.

     

    I guess stretching it to be wide has the same effect as interpret footage, or is there some quality loss in doing this?

     
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    May 25, 2013 11:39 AM   in reply to jononono

    I did a bug report, not sure if that'll accomplish anything but it seems pretty obvious it is a bug. 

     
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