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MXF, OP1a

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jason levy
MXF, OP1a
on Aug 11, 2014 at 8:35:52 pm
Last Edited By jason levy on Aug 11, 2014 at 8:37:02 pm

Hello,

I have to transcode some files to the following specs. I'm not to familiar with this format and I wonder if someone could help me out or point me to a setting file...

High Definition 1920 x 1080/59.94/i utilizing MXF, OP1a files.
All files shall be delivered per SMPTE 274M-2008
We only accept MXF file delivery standardized in SMPTE 377M-2011.
Files shall be wrapped in MXF per SMPTE 378-2004, OP1a.
MXF files shall have one MPEG-2 video stream per ISO/IEC 13818-2-2011.
MPEG-2 video essence shall be 1920 x 1080/59.94/i, 4:2:2 profile @ high level, and 50Mbps.

CH1 Original Language Stereo L
CH2 Original Language Stereo R
CH3 M&E Stereo L
CH4 M&E Stereo R

I have explored Media Encoder.. I see MXF OP1 but no signs of MPEG2 in that setting. There is a MPEG 2 setting but no OP1 in that...

Any suggestions? Appreciated, thanks,

Jason


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Thomas Nord
Re: MXF, OP1a
on Aug 11, 2014 at 10:21:59 pm

I believe what you are looking for in AME is the MXF OP1a/XDCAM HD 50 NTSC 60i preset. That should give you a video file that is compliant with the specs you are looking for.


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Ryan Holmes
Re: MXF, OP1a
on Aug 12, 2014 at 1:38:58 am

[jason levy] "I have explored Media Encoder.. I see MXF OP1 but no signs of MPEG2 in that setting. There is a MPEG 2 setting but no OP1 in that... "

Jason, just follow what Thomas said above. He nailed it.

Once you chose the MXF OP1a format then you'll need to change the codec portion of that format. The drop down menu next to "Video Codec"will allow to chose from the various installed options. XDCAMHD 50 NSTC (4:2:2) is a MPEG-2 based codec for broadcast, and the one you're looking for.

Ryan Holmes
http://www.ryanholmes.me
@CutColorPost


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jason levy
Re: MXF, OP1a
on Aug 12, 2014 at 2:23:45 am

Ryan, Thomas,

Thanks very much for that. Appreciated. File looks good. I'll send them off one to evaluate before I convert 48 episodes!

I notice that AME also created an .xmp file. I gather that is metadata and I'll look into that more tomorrow. If either of you wanted to fill me in on that I would not complain! And gladly buy you a beer if you ever end up in Montreal.

Again, thanks for the help.

Jason



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Ryan Holmes
Re: MXF, OP1a
on Aug 12, 2014 at 2:35:14 am

[jason levy] "I notice that AME also created an .xmp file. I gather that is metadata and I'll look into that more tomorrow. "

You're exactly right. The XMP file is Adobe's open-source solution file format for embedding information into a given file, or what's commonly known as metadata. Depending on your workflow and needs it may or may not help you....

https://www.adobe.com/products/xmp/

https://www.adobe.com/products/xmp/overview.html

Ryan Holmes
http://www.ryanholmes.me
@CutColorPost


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jason levy
Re: MXF, OP1a
on Aug 13, 2014 at 3:55:12 pm

So that seemed to come out fine except for one thing.. It's 4 channel audio, with stereo mix on ch 1 and 2 and M&E on 3 and 4. When I play the file back (using MXF4mac Player) from what I can see the mix is on all 4 channels. Have double checked the source and it is right.

Any thoughts on why the 4 channels don't get copied as input?

Again thanks.

Jason



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jason levy
Re: MXF, OP1a
on Aug 13, 2014 at 4:03:52 pm

Sorry I think I figured that one out. Set audio to "4 channels".

Again I notice that in AME I can create a setting for

1920 x 1080 @ 29.97

or

720 @ 59.94

but not

1920 x 1080/59.94 as requested..

Likely something about this that I don't understand. Any suggestions are appreciated.

jason



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jason levy
Re: MXF, OP1a
on Aug 13, 2014 at 5:03:24 pm

Audio didn't work.. I get 4 channels but 3 and 4 are silent... sigh.

jason



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Ryan Holmes
Re: MXF, OP1a
on Aug 13, 2014 at 5:06:22 pm

[jason levy] "1920 x 1080/59.94 as requested.. "

This is an aspect where people throw numbers around without clarifying what they mean (not direct at you, but more of our industry as a whole). So 1080i59.94 is 1080i29.97. That's because 1080i59.94 refers to fields per second which is 29.97 frames per second. So if you've set it for 1080i59.94 the only frame rate you'd chose is 29.97 (unless you were doing a 23.976 conversion).

Anyway, you're on the right track with that.

Ryan Holmes
http://www.ryanholmes.me
@CutColorPost


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Lee Watson
Re: MXF, OP1a
on Oct 14, 2014 at 2:24:43 pm

Did you ever sort out the audio channels? I am in a similar situation now...


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jason levy
Re: MXF, OP1a
on Oct 14, 2014 at 3:59:24 pm

I did find a way to do it. I bring the files into Premiere first. In Premiere you can set up a sequence with the appropriate audio channels IE 4 of them and then you send it all to Media Encoder.. it retains the proper outputs.

I believe I used this tutorial to figure it out...

http://strypesinpost.com/2012/11/exporting-multichannel-quicktimes-in-premi...



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jason levy
Re: MXF, OP1a
on Oct 14, 2014 at 4:01:19 pm

Note that you have to create a sequence with the proper outputs... to start. You cannot change them once the sequence is created. That would be too easy..sigh.

jason



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