High video level causing jitter

[Ramona Howard]

In 6 years we have never seen this issue using the AJA boards. We do encounter hot levels and do not limit the incoming video (the image is exactly what comes in). I would think this is a FCP/AJA issue, giving them a call should yield results.

Good luck,
Ramona

[Tom Brooks]

Will do.

[Jeremy Garchow]

Hey Ramona, if you can, can you capture a 10 bit clip, scale it, and tell me what you see in the highlights on a monitor?

Here’s the link to a previous problem:

https://forums.creativecow.net/cgi-bin/new_read_post.cgi?forumid=8&postid=916087&threadid=915880&pview=t

My original link:

https://forums.creativecow.net/cgi-bin/new_read_post.cgi?forumid=98&postid=861763&pview=t#head

AJA was able to replicate it, but I have not heard back. I meant to call them today but I ran out of time. This problem is biting me all day again today.

Never had this problem until FCP 5.1.2

Jeremy

[Kevin Wild]

I have been having this EXACT problem. I was dealing with some very nicely shot run and gun footage from digital beta source tapes. On my plasma (component out of the AJA LHe), it was doing occasional jitters that resembled a sync problem. Thanks to reading this post last night, I threw on the broadcast safe filter and the problem immediately disappeared.

That said, it reminds me of another problem I was having last week. I was getting a ton of shaky, jitty footage from some HVX200, DV clips. I attributed it to it being shot anamorphic and the flag being screwed up, because I would change the number in the distort menu to -33.3 and make it unrendered and it would stop. If I would render it, the jitter came back.

So, both of these problems are very similar. It’s possible that there is something going on in 5.2.1 and AJA’s latest that is being goofy on the component output. I’ve never had problems with my setup before, so I hope they figure something out.

Thanks.

Kevin

[Ramona Howard]

Sure, what do you wish it to be scaled with.(we don’t use FCP). I do remember reading your thread. I don’t think I have any 720 content on our systems, pretty much all 1080 (both 8 & 10bit) and it’s all been captured over SDI, not FW and no DVCproHD.

We and our customer have manipulated images coming thru the AJA boards pretty much every way you can think of with nothing like this. Which is why I’m pretty sure it’s the combination and not just the AJA hardware.

Anyway let me know what exactly you need and I will send you a few frames.

Cheers,
Ramona

Ramona Howard
SpectSoft, LLC
593 Hi-Tech Parkway Suite B
Oakdale, CA 95361
Phone: 209.847.7812 extension 104
Fax: 209.847.7859
https://www.spectsoft.com

RaveHD – Changing the way you think about HD

[Jeremy Garchow]

Well shoot, Ramona, I appreciate your enthusiasm but I didn’t realize you were FCP free. I’m sure it’s a silly FCP thing, or more likely an Apple 10bit codec dealy but that is just my hunch.

Thanks for the offer, though.

Jeremy

[Ramona Howard]

Actually if you send me your email I will send you a few frames which may help narrow a few things down.

We wrote our own driver for the AJA boards and again do nothing to the image. I do have some 720 stuff that we captured in as both 8bit and 10bit.

Let me know,
Ramona@spectsoft.com

Ramona Howard
SpectSoft, LLC
593 Hi-Tech Parkway Suite B
Oakdale, CA 95361
Phone: 209.847.7812 extension 104
Fax: 209.847.7859
https://www.spectsoft.com

RaveHD – Changing the way you think about HD

[Jeremy Garchow]

Done and done.

Thanks!

[Tom Brooks]

I got a call back from AJA. The engineer said that the Kona will pass video through it untouched, no matter what the level. If you feed it wildly overexposed video, it will pass it through just the same–not clipped at all or modified in any way. So, it could be that it’s inside FCP that the over-level video is getting messed up. I’m not sure how I could put this to the test. I could however test the Kona card. I’ll just run some component analog through it and compare input to output. Should be the same, no matter what the input looks like. I’ll let you know when I get time.

Final Cut Studio, FCP 5.1.2, After Effects 6.5 Pro, Quicktime 7.1.3, G5 Quad 2.5, Kona-LHe V3, 4.5GB RAM, Nvidia GeForce 7800-GT, G-RAID 2x1TB FW800.

[Kevin Wild]

Sure, but there is no problem on my computer monitor…it’s only on the output to my Plasma, so it could be FCP.

Is it just coincidence that they took away the broadcast safe setting for Kona and this is happening? Could it have had a bug or something? Not sure, but putting the b’cast safe filter on from FCP fixes the jitter.

Thanks for following up.

Kevin