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ATTENTION: ONLY FOR EXPERIENCED PC USERS!
Unfortunately, the option disappears after each vMix software update, and must be repeated after the update.


Customise the XML file with Editor in Admin mode:
C:\Program Files (x86)\vMix\streaming\ffmpegformats.xml

Insert the following before the </formats> at the end of the file:

<format>
  <name>MXF</name>
  <extensions>
    <extension name="MXF" ext=".mxf" type="mxf" />
  </extensions>
  <video codec="mpeg2video">      
    <bitRate name="50 1080 50i 25p">50M</bitRate>
       </video>
  <audio codec="pcm_s16le">
    <bitRate>PCM</bitRate>
  </audio>
  <command>-vcodec {video_codec} -b:v {video_bitrate} -acodec pcm_s16le -f {extension_type}</command>
  <interlacedSupported />
</format>

MXF can then be selected in the FFMPEG menu of the recorder, only the XDCAM HD 422 codec is available.