• Adobe Media Encoder

  I-Frame only on XDCAMHD

  Posted by James Ronan on September 12, 2017 at 4:07 pm

  Hey guys

  Hoping I’m posting in the right forum…

  I’m trying to export an advert for UK TV.

  They’re specifications are:

  Codec: MPEG-2
  Container: OP1a
  Profile / Level: MPEG-2 4:2:2 / High
  Video: 100Mb/s
  Audio: PCM 2ch 48kHz 24bit
  GOP Structure: I Frame only
  Upper Field First
  Chroma: 422
  Framerate: 25fps
  Dimensions: 1920x1080px
  File Extension: .mxf

  I am using the XDCAMHD50 PAL (4:2:2) which I think is right, but when supplied it failed because it was “long-GOP” and it needs to be “I-Frame”

  In this Codecs settings in Adobe Media Encoder under Advanced XDCAM Settings there are two check boxes:

  Force Fixed-length GOPs
  Force Closed GOPs

  Does anyone would know if having any of these checked would turn it to “I-Frame”
  And could anyone explain what they mean?

  Thanks a lot!

  James

  Pradip Patil replied 6 years, 4 months ago 3 Members · 2 Replies
• 2 Replies

• 

  Chris Wright

  September 13, 2017 at 7:26 am

  gop length is from I frame to I frame so if that is 1. it should be all i frames (fastest editing)
  closed is not using adjacent b frames.(somewhat fast editing)

  i would select both and then test with ffmpeg’s ffprobe

  ffprobe -show_frames videofilename.mp4 > outputfile.txt
  Then you just look for the pict_type entries, which will be either I, P, or B. B denotes a b-frame.
• 

  Pradip Patil

  January 18, 2020 at 2:52 pm

  Hi James,

  Did you find solution to this as I have received similar specs for a project. I tried what Chris Wright suggested but the file still shows as non I-frame in MediaInfo.

  Thanks.

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