Latest post Mon, May 7 2018 4:05 AM by Martin Fox. 7 replies.
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  • Fri, Apr 27 2018 5:34 PM

    • mkj
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    Fastest way to export a sequence from Avid to a OP1a MXF?

    have a project where export time will be critical.

    How do I get Avid export fast as possible?

     

    I will also need to export .mp4 h264 files.

     

    What kind of computer should I use? Any 3rd party apps that can do it faster?

  • Fri, Apr 27 2018 8:00 PM In reply to

    • NYnutz
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    Re: Fastest way to export a sequence from Avid to a OP1a MXF?

    AMA file export to MXF op1a is quite fast. I have benchmarked it at 30% of realtime on a HP z840 in MC2018.4 when exporting a DNX145 sequence to DNX145 OP1a MXF. A 90 minute timeline takes about 30-35 minutes to export. 

     

    IMO, use the MXF op1a master file to generate your H.264 MP4s in ffmpeg or similar. 

    Dave

    Post Production Infrastructure Engineer

    "A very big network"

     

  • Sat, Apr 28 2018 10:50 AM In reply to

    • mkj
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    Re: Fastest way to export a sequence from Avid to a OP1a MXF?

    hmm, our delivery specification says "MXF OP1a XDCAMHD"

    -you cant choose XDCAMHD" when exporting to "AMA File export", only when you choose "Export to a file"

     

    The media on the sequence will be XDCAM HD 50. We need to have the fastest export, should the broadcaster be able to handle a DNxHD36 MXF OP1a?

     

    EDIT: I want a fast export, AND a small file as possible. We will maybe have a slow upload Internet connection on this production, and it is short time between edit and broadcast...

    But after reading this excellent thread https://community.avid.com/forums/t/125792.aspx  I understand that DNxHD36 isnt good enough...

    So....export to AMA is really fast, but will make a big file(DNxHD120)

    Export to XDCAM HD 50 will take a long time and give a good quality, but will make a small file.

    But I assume that if I have a "super"-computer, export to XDCAM can get faster? What do Avid MC use most when exporting, CPU, GPU? 

  • Sun, Apr 29 2018 8:12 AM In reply to

    Re: Fastest way to export a sequence from Avid to a OP1a MXF?

    DNxHD36 is fine depending on the target.

    AMA File Export can export as XD.

    I have examples here:

    http://community.avid.com/forums/t/184052.aspx

     

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  • Sun, Apr 29 2018 9:30 AM In reply to

    • mkj
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    Re: Fastest way to export a sequence from Avid to a OP1a MXF?

    hmm, how? 

    Can only choose XDCAM when I choose "Export to a file" 

    (running MC 2018,4)

     

    This is the options when choosiing AMA File Export:

     

  • Mon, Apr 30 2018 3:16 AM In reply to

    • Martin Fox
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    Re: Fastest way to export a sequence from Avid to a OP1a MXF?

    Hi I have been using this method too, but I have a problem in ffmpeg with the audio , which is presented as one channel only, of a stereo  (dual monoJ file.

    Is it possible to work around this in ffmpeg, or get a stereo (not dual mono file) from avid?

    My current work around is to separately export a stereo wav from avid and bring that into ffmpeg as an external audio file, but this is clumsy and I have experienced some timing drift on long projects.

    Any thoughts?

    M

    iMac Retina27 late 2017 4.5Gz i7 40GB AMD 8GB with Sata Raid OS 10.13.3 MC 2018.3 BMD mini monitor with Eizo monitor [view my complete system specs]
  • Wed, May 2 2018 1:18 PM In reply to

    • knejmann
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    Re: Fastest way to export a sequence from Avid to a OP1a MXF?

    In ffmpeg i would think that adding this filter would make the dual mono tracks into one stereo track:

    -filter_complex "[0:1][0:2] amerge=inputs=2, pan=stereo|c0=c0|c1=c1"

    or maybe just:

    -filter_complex "[0:1] [0:2] amerge"

     

    You can also have a look at https://trac.ffmpeg.org/wiki/AudioChannelManipulation#a2monostereo

    Media Composer 8.2.6 (some with Symphony option) - Windows 7 - HP Z420/Z820 (Nitris DX), Lenovo W540 etc. - Interplay and ISIS7000+NEXIS storage - Avid... [view my complete system specs]

    Kåre Nejmann

    Danish Broadcasting Corporation - DR
    Aarhus, Denmark 

  • Mon, May 7 2018 4:05 AM In reply to

    • Martin Fox
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    Re: Fastest way to export a sequence from Avid to a OP1a MXF?

    Thanks Kare, much appreciated

    iMac Retina27 late 2017 4.5Gz i7 40GB AMD 8GB with Sata Raid OS 10.13.3 MC 2018.3 BMD mini monitor with Eizo monitor [view my complete system specs]
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