This IS the Avid L2: Re: [Avid-L2] Practical Solution to Hulu Rejection of random Cadence?

Thursday, February 19, 2015

Re: [Avid-L2] Practical Solution to Hulu Rejection of random Cadence?

When I spoke with a Teranex person at NAB years back I'm pretty sure it was before they were bought so it was probably an older bigger iron Teranex solution. I was pretty clear to the Teranex rep that I wanted to know if it could handle random cadence on the fly and he said yes. Could it be the older unit was more stable and robust? I never actually tried it on anything myself so I don't have any practical experience with the results but it wouldn't surprise me if the newer units aren't as good as the older ones but that's just my gut not based on fact. For me smaller, cheaper and better rarely happen but what do I know?

---In avid-l2@yahoogroups.com, <cutandcover@...> wrote :

Teranex 2D, despite the manual/site claims, does not remove inconsistent cadence correctly. So don't bother trying it, unless you then want to go through with a fine toothed edit comb and suss out every place the Teranex decided to give you duplicate frames.

The only method I would use is to take your 29.97 sequence into a 23.976 project. Then you can adjust the motion adapters down the sequence to remove pulldown where needed, and you'll have a 23.976 show.

This is lots of work, but is the only real bulletproof method in these cases. I've never seen anything software or hardware that can detect and remove pulldown with jumping cadences.

On Thu, Feb 19, 2015 at 2:57 PM, John Moore bigfish@... [Avid-L2] <Avid-L2@yahoogroups.com> wrote:

On of our series has been rejected by Hulu based on random cadence issues. We should have been working in a 23.976 project from the beginning but the project was setup as 29.97 NTSC SD. Most of the material is DVCProHD shot at 23.976 and their is some Canon 5D file based at 23.976. We also have some archival footage that varies between 23.976 and 59.94. 23.976 file material was ama'd in a 23.976 project and transcoded to 14:1 for offline. The DVCProHD tapes were ingested at 29.97 with the Panny 1200 and 1400 decks set to add pulldown. Hence the inconsistent cadences etc...

I'm thinking the most practical solution would be to take out HDCam master tape and run it through a Teranex or Alchemist type box. My understanding from a Teranex rep a few years back at NAB was that the Teranex can handle inconstant pulldown in real time. Given most of the show is 23.976 with pulldown added would it make sense to run the show through a Teranex or other hardware and have it remove pulldown on the fly to create a new 23.976 progressive master? This is the only practical solution I can see. Had I been involved at the beginning of the project I would have kept everything at 23.976.

What happens when removing pulldown through a Teranex or other device when there is some 29.97//59.94 material? I'm surprised Hulu didn't make a suggestion as to how to convert the master as I'm sure they see these kind of issues all the time. Is there a completely file based solution for these type of conversions. I remember Cinema Tools could remove pulldown on files but it had to be a consistent cadence, does an Alchemist or other converters handle file to file pulldown removal like a tape to tape dub would accomplish?

Would it make sense to just deinterlace the whole show? That would reduce vertical resolution in half but would take care of the split frame and cadence issues. Seems to me like Hulu should be set up to handle these issues on their end but I guess they don't want to be bothered or incur the expense.

John Moore
Barking Trout Productions
Studio City, CA
bigfish@...