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Transcoding P2 Footage in Avid

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Subfish
Transcoding P2 Footage in Avid
on Sep 16, 2014 at 9:36:04 am
Last Edited By Subfish on Sep 16, 2014 at 7:43:50 pm

Hi folks

I have a strange one here that's puzzling a few of the editors I work with. Working on a broadcast doc which was shot on P2 at AVC-I100 1080i/25pn. Worked offline at DNX36 but now at the grading stage, usual practice here is to duplicate sequence, make media offline then relink to original camera rushes and transcode to DNX-HD185. However after the transcode there is a noticeable deterioration in the images, with banding visible in shaded areas. Yet when I apply the exact same grade to the AMA Linked flies they're perfectly clean.
I've only recently upgraded from Symphony 6 and Im wondering if this is a Version 8 thing?? Thoughts anyone?

I love tape, I really do.


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Michael Phillips
Re: Transcoding P2 Footage in Avid
on Sep 16, 2014 at 12:40:03 pm

As a test, what does it look like if you render the color corrected AMA linked clips to the same target resolution?

Michael


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Subfish
Re: Transcoding P2 Footage in Avid
on Sep 16, 2014 at 12:52:17 pm

Hi Michael
That's the strange thing. I did a test last night, put the same shot on the sequence twice, one transcoded and one AMA, applied the grade to both and then did a video mixdown of the sequence at 185. The AMA linked clip was still fine.

Andrew

I love tape, I really do.


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Robert Pitman
Re: Transcoding P2 Footage in Avid
on Sep 17, 2014 at 2:39:48 am

Hello Andrew,

Try DNxHD 185X so your transcode is 10bit like the AVC-Intra AMA footage...

I'm going by http://en.wikipedia.org/wiki/AVC-Intra as I've not used P2 AVC-Intra files before.

Also look at "Media Creation" "Render" "Effects Processing" is not set to 8-bit?

I hope this helps?

Regards,
Robert


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Andrew Stewart
Re: Transcoding P2 Footage in Avid
on Sep 18, 2014 at 10:46:36 pm

Hi Robert

Think you were right on the money there. It appears to have been the settings under 'Media Creation' etc.

Thanks for that! Greatly appreciated.

Andrew

I love tape, I really do.


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