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MXF OP1a export for broadcast

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Nelson Ng
MXF OP1a export for broadcast
on May 17, 2017 at 1:24:04 pm

Hi, I have a project that I need to export for broadcast. As the schedule is quite tight, I would like to get it right on the first time. Can someone let me know what are the exact settings for the following requirements?

Video:
File Container - MXF OP1a (SMPTE 378M)
Codec Sony - XDCAM HD422
Chroma format - 4:2:2
Bit Rate - 50mbps
Display Resolution - 1920 x1080
Frame rate - 25fps (501
Scan Mode - Interace, top field first
GOP - IBBP (Length: 12) - Sequence header on each GOP - First GOP closed
Aspect Ratio 16:9

Audio:
Format - AES - 3 (SMPTE 382M)
Audio Essences - 8
Channel per essences - 1 (Mono)
Sampling rate - 48Khz
bit depth 24bit
Dynamic Range - Between -20dbfs and -10 dbfa
Loudness - Normalise at -21db

Thanks a lot, much appreciated!


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Daniel Waldron
Re: MXF OP1a export for broadcast
on May 17, 2017 at 1:55:21 pm

The video settings are pretty straight-forward. You should be able to set those in your export window. You'll probably just want to make sure your chroma and luma levels are broadcast safe.

Audio can be a little tricky. I would bring your final audio mix into Audition, so you can easily normalize the audio. I like to use the Match Loudness feature to automatically bring everything into the broadcast legal range. You'll want to have a good sounding mix first though. You can use the Loudness Radar in Premiere or Audition to help adjust your mix manually. Keep in mind that with stereo exports, I believe Premiere may export 3db louder, so do a test export (you can check it with the Amplitude Statistics or Loudness Radar in Audition) and if that's the case, just drop your levels -3db in Premiere and you should be good. Premiere also has a Loudness Normalization box in the export window, but I've had mixed results with that.


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Nelson Ng
Re: MXF OP1a export for broadcast
on May 17, 2017 at 2:02:17 pm

Is there a specific preset for the video I should use?

I wasnt sure what to put for
GOP - IBBP (Length: 12) - Sequence header on each GOP - First GOP closed

And where I can change the Bit Rate


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Tero Ahlfors
Re: MXF OP1a export for broadcast
on May 17, 2017 at 3:30:58 pm

MXF OP1a is a pretty strict codec. Pretty much the only setting you can change is whether the file is interlaced or progressive. You don't need to bother with anything else.


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Todd Perchert
Re: MXF OP1a export for broadcast
on May 17, 2017 at 7:04:33 pm

There are system presets for MXF OP1a in AME. Just scroll down to the one that matches your listed requirements. There's an XDCAM 50mbps 25fps 1080 preset.
TC


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