4 Replies Latest reply: Mar 22, 2013 2:39 PM by Thien Do
Thien Do Level 1 Level 1

Hello,

 

I'm working with footages that were shot on an Epic at 4K, 24fps, 16:9 aspect ratio. We transcoded them to ProRes LT 2K resolution. The frame size reads 2048 x 1152, which is a 16:9 aspect ratio. However, the standard size for 2K is usually listed as 2048 x 1920 (like on the AJA T-Tap's tech specs) which works out to be another aspect ratio.

 

Am I doing something wrong? Why is there this discrepancy?

 

Thien


MacBook Pro, Mac OS X (10.6.8)
Solved by RatVega™ on Mar 17, 2013 5:07 PM Solved

2048 x 1152 is mathematically correct for the HDTV 16:9  (1.78:1) aspect ratio.

 

The DCI standard uses a 1.89:1 aspect ratio which equates to 2048 x 1080.

 

You are not doing anything wrong, it just depends on which "standard" you are going to follow.

  • Russ H Level 7 Level 7
    expertise.quicktime
    Quicktime

    Thien Do wrote:

     

     

    We transcoded them to ProRes LT 2K resolution. The frame size reads 2048 x 1152, which is a 16:9 aspect ratio.

    What did you use to transcode?

     

     

    However, the standard size for 2K is usually listed as 2048 x 1920 (like on the AJA T-Tap's tech specs) which works out to be another aspect ratio.

    Assume you meant to type 2048x1080?

     

    Russ

  • Thien Do Level 1 Level 1

    Sorry. Yes I meant to type 2048 x 1080.

     

    I didn't do the transcoding myself so I don't know what was used for the transcoding.

  • RatVega™ Level 4 Level 4

    2048 x 1152 is mathematically correct for the HDTV 16:9  (1.78:1) aspect ratio.

     

    The DCI standard uses a 1.89:1 aspect ratio which equates to 2048 x 1080.

     

    You are not doing anything wrong, it just depends on which "standard" you are going to follow.

  • Thien Do Level 1 Level 1

    Thanks. That's a relief to know.