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Old 15th December 2016, 15:58   #25331  |  Link
jdobbs
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Join Date: Oct 2001
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Quote:
Originally Posted by Sharc View Post
Are you really positive that 576p23.976 is included for secondary video for Blu-ray? I thought that only 480p23.976 is accepted for secondary video, but not 576p. Maybe I am wrong. I agree however that players will usually play it anyway.
Hmm.. I'll go back and look. But, if you are converting to NTSC you would be resizing to 480p anyway.

[Edit]

According to Chapter 8 of that standard (para. 8.3.1), when the primary video is 1920x1080, 1440x1080 or 1280x720 the secondary video can be 720x480 or 720x576. Also 576p is an acceptable video type (it is video_format=7) in the StreamCodingInfo() table.

I assumed that would infer that a primary stream that is progressive would also require a progressive secondary stream at the same frame rate.

But... when looking at Table 9-49 in the standard, – which shows the allowed combinations of primary/secondary video formats, it appears that 720x576 (p or i) is only allowed when the primary frame rate is either 25fps or 50fps. So the bottom line is that 576p is supported -- but only at 25fps, not at 23.976fps.

So you are correct. 576p/23.976 is not a legal format.
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Last edited by jdobbs; 15th December 2016 at 16:30.
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