720p59.94 to 1080i29.97

[Christopher Tay]

Sorry this may sound weird but also need to find out if there is a good conversion tool/software to convert 720p59.94 to 720p29.97.

Thanks,

-chrispy

[Shane Ross]

AJA Kona 3. That will convert when you output. Other than that, output to tape than have a post facility with a Terranex box do the conversion…or export a self contained file, reimport that, drop it into a 1080i 29.97 sequence…and render…then output the self contained file again. That is a decent way…but really, the Kona 3 is the better choice.

Why 720p 29.97? Never heard of that used as a deliver format. 720p 59.94 yes, 1080i 29.97 yes, but not 720p 29.97.

Shane

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[Christopher Tay]

Hi Shane,

The reason why we had to do a 720p29.97 sequence is that we need to export an OMF audio from FCP to give to the ProTools house which can only work with 29.97 instead of 59.94.

We also did a self contained movie export of the 720p59.94 sequence and then import it back to FCP and edit it into a 1080i29.97 timeline but we noticed some of the motion, especially fast motion clips, have some stroby look to it so we’re trying to see if there’s a better method of converting from 59.94 to 29.97.

For this project, the final master is 1080i29.97.

-chrispy

[Mark Raudonis]

Chrispy,

It sounds like you’re caught going between progressive and interlaced.

The “Stroby” motion is coming from going from progressive to interlaced back to progressive. I’ve found that FCP can end up confusing the cadence and end up with something like 2;2;2;4 which contributes to the strobey motion that you’re seeing.

The easiest way to confirm this would be to go out to tape with both flavors and advance through the fields on an NTSC monitor. Then, you can confirm that it’s the fields that are causing your issues.

Good luck.

mark

[Sean Oneil]

[chrispy] ”
Does anyone know of a good conversion tool/software to convert from 720p59.94 to 1080i29.97 and takes good care of the motion conversion from progression to interlaced.”

There is no motion conversion. It just throws away every other frame, regardless if you do the conversion with a Teranex or Quicktime Pro.

This is pretty much the most basic conversion there is. Going from progressive to 30i interlace is monkey work for any software or hardware tool. Put your clips on a 1080i timeline and render. That’s all you need.

[Jeremy Garchow]

[Sean ONeil] “This is pretty much the most basic conversion there is. Going from progressive to 30i interlace is monkey work for any software or hardware tool. Put your clips on a 1080i timeline and render. That’s all you need. “

Hmm, I thought that each progressive frame became one field to create a true interlaced image (60p then becomes 60i with each p frame equaling one i field). If you threw out every other frame, you would end up with 1080p, not 1080i.

Jeremy

[Walter Biscardi]

[chrispy] “Does anyone know of a good conversion tool/software to convert from 720p59.94 to 1080i29.97 and takes good care of the motion conversion from progression to interlaced.”

AJA Kona 3. We do this all the time.

Walter Biscardi, Jr.
Biscardi Creative Media
HD and SD Production for Broadcast and Independent Productions.

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[Sean Oneil]

[JeremyG] “Hmm, I thought that each progressive frame became one field to create a true interlaced image (60p then becomes 60i with each p frame equaling one i field). If you threw out every other frame, you would end up with 1080p, not 1080i.”

Not at all. It throws out every other frame, making it 30p. Then it interlaces it to make it 60i. Otherwise, having 60 unique fields would be a disgusting mess of combing artifacts on any monitor. The only way to have 60 frames per second in an interlaced signal would be to convert it to 120i – which obviously doesn’t exist in real life.

[Jeremy Garchow]

Cool.

Actually, i take that back. I will have to do a test and see what I see.

60 unique fields is the way interlacing works and some people will argue that it is a disgusting mess.

Also, 120i would equal 60p not 60i. We don’t want 60 frames per second we want 30 frames per second (or 60i per second).

I am not doubting you, just offering conversation.

Jeremy

[Sean Oneil]

Please test all you like :). It’s really simple. His 720p source is 60 unique frames per second. 60p. He wants to convert it to an interlaced format, thus it will have to become 30 frames per second. All interlaced formats are 30 frames per second or less (PAL, film, etc.). There is no interlaced format, and if there was it would be called 120i.

A field is only half of a frame. There is always two or more of them for each frame of video. Always. No exceptions. Combine the two together and you get a complete image captured at the same moment in time. You can’t have just one field per frame, as you were suggesting. Sometimes you can have redundant frames or fields, like with 3:2 pulldown (some frames will have 3 fields, one of them is a dupe). But never just one.