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Question about 1080i 50.

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Brandon Adam
Question about 1080i 50.
on Sep 25, 2013 at 2:21:27 am

Is 1080i50 basically; 1920 by 1080, 50fps (interlaced, Upper Fileds)?


-Thanks


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Walter Soyka
Re: Question about 1080i 50.
on Sep 25, 2013 at 3:37:39 am

[Brandon Adam] "Is 1080i50 basically; 1920 by 1080, 50fps (interlaced, Upper Fileds)?"

Almost -- 1080i50 is 1920x1080, 25 frames per second (50 fields per second). You should set your comp's frame rate to 25 fps.

When you render, click on the render settings for your render queue item and make sure that you've set the Field Render option to Upper Field First.

Walter Soyka
Principal & Designer at Keen Live
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Brandon Adam
Re: Question about 1080i 50.
on Sep 25, 2013 at 6:15:14 am

Thank you Walter. Also, what would be the best way to convert a video at 25fps to 50fps? I converted a 25fps clip to 50fps, the motion is sort of "blurred".

-Thanks


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Tom Sefton
Re: Question about 1080i 50.
on Sep 25, 2013 at 10:44:21 am

You can't really convert 25p to 50p in an effective way. 50p is 50 progressive (full frames) per second - twice the amount in 25p footage. You are asking for an extra 25 frames per second to be created, so your editing program will duplicate frames, hence the blurring.

The only other option available if you need 50p footage from a camera that wont shoot 1920x1080 50p, is to shoot 1280x720 at 50p and then resize your footage.


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Brandon Adam
Re: Question about 1080i 50.
on Sep 25, 2013 at 9:53:02 pm

Thank you Tom for the reply.

Just a note on the 50i graphics in After Effects, they are still not playing as smooth as they should. Like Walter said, I create a 25fps comp, 1920 by 1080 HDTV, then when added at render, I change the fields > upper fields and render. I must be doing something wrong.

-Thanks


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Tom Sefton
Re: Question about 1080i 50.
on Sep 26, 2013 at 7:30:02 am

OK, so if you are creating a graphics sequence in 25p then render it out at 25 frames progressive.

When you bring it into Premiere, interpret your footage to 50i and see if this helps.


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Brandon Adam
Re: Question about 1080i 50.
on Sep 26, 2013 at 1:13:42 pm

Okay thanks, Ill give that a go. What would be the best codec for rendering graphics?

-Thanks


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Tom Sefton
Re: Question about 1080i 50.
on Sep 26, 2013 at 2:31:42 pm

Depends on so many different things. If you are on Mac then go for a ProRes422 sequence. If PC, then a Blackmagic or Cineform one is good. Otherwise, a PNG or TIFF sequence is good for graphics sequences.


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