Re: [Avid-L2] Re: Dolby E frame conversion question

 

What Pat said.

I use a Tek AMM768 (http://www.tek.com/audio-monitors/amm768) which is an audio monitor that has SDI inputs and AES outputs and a Dolby E decoder built in. I send the SDI signal from tape through the AMM and decode the E into its parts, and capture the channels over AES into a Nitris DX at 24-bit / 48 kHz (PCM/MXF). Then, for E encode, I use the Minnetonka SurCode for Dolby E encoder (http://minnetonkaaudio.com/index.php?option=com_content&view=article&id=83&Itemid=99) to do an offline encode at the new frame rate.

On Tue, Nov 12, 2013 at 5:11 AM, Pat Horridge <pat@horridge.org.uk> wrote:

 

Dolby E is just a data stream created with guardbands around the video frame boundaries.

So it's PCM uncompressed data.

If you capture as PCM (MXF is fine) at 24 bit you will capture a data stream. You can't play it back and hear audio but you can, in theory cut it on video frame boundaries and lay back to tape.

It's imperative that it retains sync with the video frames of course.

There are plugins that let you decode the data stream to discreet audio channels either in software or in hardware externally.

The safest way is to decode the Dolby E on the way in to your Avid and capture 5.1 audio (it could be 8 channels in all)

Then frmae rate convert and the re-encode back to Dolby E. that can all be done in software but make a mistake anywhere and you can corrupt the stream.

 

Pat Horridge
Technical Director, Trainer, Avid Certified Instructor
VET
Production    Editing     Digital Media     Design     DVD
T +44 (0)20 7505 4701 | F +44 (0)20 7505 4800 | E pat@vet.co.uk |
www.vet.co.uk | Lux Building 2-4 Hoxton Square  London N1 6US

 

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