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[Openexr-devel] New framesPerSecond Attribute?
From: |
Florian Kainz |
Subject: |
[Openexr-devel] New framesPerSecond Attribute? |
Date: |
Fri, 13 Oct 2006 21:05:52 -0700 |
User-agent: |
Mozilla Thunderbird 1.0 (X11/20041207) |
I would like propose a new "framesPerSecond" standard attribute
for OpenEXR:
The attribute defines the frame rate at which an OpenEXR image
sequence should be played back. All frames in a sequence should
have this attribute, and the attribute's value should be the same
for all frames. If no frame rate is specified for a sequence,
then playback software should assume 24 frames per second.
The attribute's value could be represented either as a floating-
point number or as the quotient of two integers. A floating-point
number would be easier to use, but it cannot represent NTSC frame
and field rates exactly. A quotient would be slightly less
convenient, but all commonly used frame rates, including NTSC,
can be represented exactly.
frame rate float quotient
--------------------------------------------------------
35-mm film 24.0 24 / 1
PAL video, 25.0 25 / 1
50 Hz HDTV frames
NTSC frames 29.97003 30000 / 1001
60 Hz HDTV frames 30.0 30 / 1
50 Hz HDTV fields 50.0 50 / 1
NTSC fields 59.94006 60000 / 1001
60 Hz HDTV fields, 60.0 60 / 1
Showscan
If you have comments or opinions, I'd like to hear them.
Thank you,
Florian
- [Openexr-devel] New framesPerSecond Attribute?,
Florian Kainz <=