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720p59.94 to 1080i29.97
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Typo in my first paragraph (WHY CAN’T THE COW LET US EDIT OUR POSTS – we are editors!)
Meant to say there is no such thing as a 60 frame per second interlaced format. If there was it would be 120i.
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Right. Which is why 60p when converted to 29.97 can equal 60i (with one frame becoming one field). I have to test this, right now.
You can edit your posts now within 30 minutes or until someone posts back. Simply go back to your post and hit Edit Post.
Jeremy
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Sorry Sean, in the quick test, I was definitely not getting a 30p image from a 60p cross-convert.
It is in fact 1080i.
Jeremy
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[Sean ONeil] “(WHY CAN’T THE COW LET US EDIT OUR POSTS – we are editors!)”
You can. Open the post. Edit Post is in the lower left. You have 30 minutes from when you first enter the post or until someone replies to it.
Walter Biscardi, Jr.
Biscardi Creative Media
HD and SD Production for Broadcast and Independent Productions.STOP STARING AND START GRADING WITH APPLE COLOR
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[JeremyG] “Sorry Sean, in the quick test, I was definitely not getting a 30p image from a 60p cross-convert.
It is in fact 1080i. “
Jeremy,
1080i is thirty frames per second. I don’t know why you think there are professional videos being made with only 1 field per frame. I’m shocked actually. What test did you do, and what makes you think it’s more than 30 frames per second?
Seriously, if there is a converter that processes one field in the manner you described, I’d like to know what it is. No place in the world would accept a tape with that on it.
What are you watching it on? Are you jogging through in a FCP sequence with the editing timebase set to 60? And you’re seeing 60 unique frames from 1080i footage!?! That’s ludicrous.
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Sean, I don’t see how you are so confused by this. I am playing out 720p60 material through a Kona 3 doing a cross convert with an ioHD to 1080i29.97 and recording it.
You have 720p60. Each frame of 60p gets put into a field, which means you turn 60p into 60i which is 30 frames per second.
Simple really.
Jeremy
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[JeremyG] “You have 720p60. Each frame of 60p gets put into a field, which means you turn 60p into 60i which is 30 frames per second. “
You’re contradicting yourself in the same sentence. It does not pull a field from each frame in this case. If it did you wouldn’t have 30 frames per second. You would have 60 frames per second, but half of each frame would be missing.
Maybe your source is not actually 60 frames per second. That would explain why you think you are seeing that. Most 720p60 content is really only 30 frames per second (each frame is doubled up). In this case there’s be no way of identifying it.
This is going nowhere. I’ll post some quicktimes in a bit to show you.
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[Sean ONeil] “Maybe your source is not actually 60 frames per second. That would explain why you think you are seeing that. Most 720p60 content is really only 30 frames per second (each frame is doubled up).”
What? This is getting out of hand.
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Proof.
Here is an “original” 720p 60 frames per second video clip. Timecode generator showing you the frame count:
https://www.geocities.com/lifterus/Original_720p60.mov
I then exported that file as a self-contained quicktime, re-imported it, and placed it on a 1080i sequence. Rendered, output it, and this is what it looks like now:
https://www.geocities.com/lifterus/Converted_to_1080i.mov
That is a true 1080i60 interlaced quicktime video. Notice how every other frame has been omitted. That is how it works.
Had it worked the way you described, you would see timecode numbers blended together.
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[walter biscardi] “You can. Open the post. Edit Post is in the lower left. You have 30 minutes from when you first enter the post or until someone replies to it.”
Thank you (and Jeremy) for that. I’ll be sure to use it!
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