720/ 30p

malcolm man

malcolm man

Active member
Hello,

Now I searched this out a bit and didn't see any threads regarding 720/30p capture issues (maybe I was in the wrong forum) .

I'm capturing live from the Panasonic HVX200. I Capturing live into Avid Xpress Pro HD being that I still do not have the o' so coveted P2 card:violin:.

I'm not sure if this next paragraph will make any sense to you if you're not an Avid user. Anyway, I created a 720/30p project, yet can not get it to capture! When I enable the "V" button in the capture window, it says, "No signal present". I've tried power cycling, I've checked that my camera is in the right frame rate and res, I've tried different tape names, etc...

Now I can capture 720/24p, 720/60p just fine. Avid recognizes the signal instantly! I don't know what the deal is. The reason I'm capturing in 720/30p is that I'm going to be shooting alot of green screen material which will be imported into After Effetcs. This is already a very complex project and I don't want to worry about doing a pull down or adding any extra steps where something could go wrong.

I've even tried capturing 720/30pn. No luck:furious3:

So, any ideas? I'll be shooting my green screen footage Friday (08.24.07) so hopefully I can get this figured out by then.

Many thanks for any input!
 
Oh, and the end project has to be in 30p. After all this fuss, this project will be dumped back to a miserable little dv tape.
 
A 60p pulldown isn't nearly as objectionable as a 60i pulldown. You're still working with full, progressive frames, and in fact, the exact same frames, only 2 and 3 times each.

Anyway, once I find my Avid dongle, I'll see if I can replicate the problem.
 
yes, please find that dongle! You think 6oi would be alright for chroma key? I haven't tried it out. My goal here is to avoid any pull down at all.
 
60i is evil for chroma keying. (okay, not evil, it's been done for years, but it's *much* better to go from a progressive source...)
 
malcolm man said:
yes, please find that dongle! You think 6oi would be alright for chroma key? I haven't tried it out. My goal here is to avoid any pull down at all.
Click to expand...

60i? No, as Barry says, avoid it. But 60p isn't nearly as onerous, as I said above. All progressive, self-inclusive frames, just repeated.

Remember, though, if you're shooting 720p/30P (not 30pN), you still have a "pulldown" of sorts -- you're recording each frame twice in a 60p stream, so you have repeated frames, just like you would with 24p. But like I said, they're all progressive.

I think it's a moot point, though, because Avid should strip out the extra frames when you feed it 24p in a 60p stream (as you must through FireWire), so the pulldown is taken care of for you. After Effects should be able to handle the footage with no problem.
 
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Yeah, that's what I thought Barry.

"Avid should strip out the extra frames when you feed it 24p in a 60p stream (as you must through FireWire), so the pulldown is taken care of for you. After Effects should be able to handle the footage with no problem."

It does? Sorry, I'm still getting my head around the in an outs of HDV. This is only my second hdv project.
 
It's not HDV -- it's DVCPRO HD. :) One more thing to get your head around.

But yes, Avid should to that if you're capturing to a 720p/23.976 project.
 
"It's not HDV -- it's DVCPRO HD."

Yeah, sorry. I knew that. I just get used to calling it hdv or hd with clients becuase saying it's DVCPRO HD usually gets them a bit confused.

Well, I'll try printing some of this stuff to tape and see how it goes.
 
Well, once it's on tape, it will look miserable compared to the original DVCProHD source. It will look very nice in comparison to what comes out of some other DV cameras, but it will be a significant step down from what the camera is capable of.
 
Yes. I realize this. Unfortunately the local stations only accept DV tapes. Don't ask me why. It's a sad, sad story.

I'm only shooting in 720 being that this footgae needs to be chroma keyed. Obviously I need all the resolutinon I can get for that.
 
At least the conversion to DV happens as the last step, so you still benefit from the increased resolution, chroma sampling, and progressive video.
 
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