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djam productions
Verifying 24p flag
on May 1, 2006 at 4:28:31 am

Hi,

Does anyone know if there is a way to verify that Encore has seen the 24p flag in my MPEGs, or that it is including the flag when it builds the DVD?

Thanks,

Daniel


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Joe Bowden
Re: Verifying 24p flag
on May 1, 2006 at 2:52:27 pm

You'd need an MPEG analyzer for that. Bitrate Viewer might be able to do that for you.

Note that if the flag is set, Encore will not change it at build time.


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Mark Weaver
Re: Verifying 24p flag
on May 1, 2006 at 10:36:20 pm

What does the 24p flag do on the DVD? I thought
all DVDs were played as 29.97 for NTSC?

Is this the ubercool thing that makes my NTSC
video more film like?

Thanks

Mark


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Joe Bowden
Re: Verifying 24p flag
on May 2, 2006 at 12:49:48 am

All NTSC DVDs are 29.97 fps. However, if you encode a 24p video file to MPEG-2 for DVD, which must be 29.97, flags are added to instruct the DVD player to do pulldown for 24p.


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Mark Weaver
Re: Verifying 24p flag
on May 5, 2006 at 5:06:54 pm

Aw.. That makes sense. Thanks for the explaination, but
why would someone do this? Not to be too pesky, but
why would you create a 24FPS MPEG-2 and then leave the
conversion to the DVD player? Does this give better
results or more film like effects?

Thanks

Mark


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Joe Bowden
Re: Verifying 24p flag
on May 7, 2006 at 7:30:12 pm

NTSC DVD players support only MPEG-2 files that are 29.97 fps. So the only way they can do 24p is with the pulldown instructions when the file is encoded to MPEG.


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Mark Weaver
Re: Verifying 24p flag
on May 7, 2006 at 8:58:55 pm

Joe,
Why would someone create a 24FPS MPEG if it is going to
be converted to 29.97 via DVD player? Why not just create
the 29.97 MPEG instead?

Thanks for the help.

Mark


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Joe Bowden
Re: Verifying 24p flag
on May 8, 2006 at 2:18:31 pm

For DVD, there is no 24p MPEG. All 24p must be transcoded to 29.97 fps with pulldown flags for 24p playback.


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Mark Weaver
Re: Verifying 24p flag
on May 8, 2006 at 2:37:26 pm

Joe,
I appreciate your responses, but I must be failing to ask the question
correctly. I understand that DVDs are 29.97FPS MPEG and that a 24FPS MPEG
must be upsampled through the use of the pulldown method. However, my question
is why would anyone create a 24FPS MPEG in the first place? Why not just
create the MPEG at 29.97 when it is originally created?

Thanks

Mark


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Joe Bowden
Re: Verifying 24p flag
on May 8, 2006 at 7:41:49 pm

I don't know why anyone would produce a 24p MPEG-2 file. It can't be used on a DVD-Video disc.


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Joe Bowden
Re: Verifying 24p flag
on May 8, 2006 at 7:46:52 pm

Scatch all that...it's not quite right.

Let me do a little research, then get back on this thread.


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Joe Bowden
Re: Verifying 24p flag
on May 8, 2006 at 8:01:19 pm

I had it sort of backwards (apologies).

24p MPEG-2 is supported, but it should have the pulldown flags for 29.97 fps on a non-progressive display. The big advantage to using it is you can encode to MPEG-2 with less compression (and higher quality), since there are approximately 6 fewer frames per second.

I cannot claim expert knowledge in this area, so I'll defer to any experts here, and advise researching more online if you have more questions.


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Mark Weaver
Re: Verifying 24p flag
on May 8, 2006 at 8:40:43 pm

Joe,
Now this makes sense. Never thought about it though. You
could definetly get more onto the DVD. Hmmmm... Interesting.
Always more for me to learn. Thanks very much for digging
up this answer.

By the way, you work for Adobe right? Well, as I've said,
in the surveys they've sent me Encore is a great tool. Even
though I'm still learning, I can get it to do everything
I want to. :-)

Thanks again for the help.

Mark


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