# OP1a

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**Export Tagging Options**

* **Tag All H.264 Exports as ‘High Unconstrained’**\
  When enabled, all generic **H.264 video exports** within MXF OP1a files will be tagged using the widely supported **'High Unconstrained'** profile.

  > If disabled, the export will attempt to use the specific H.264 profile based on the encode settings, which may offer more precision but less compatibility.
* **Use MCA Audio Labels**\
  When enabled, audio channels in MXF OP1a exports will be tagged with **descriptive MCA labels** (e.g., Front Left, Front Right, Center, LFE).

  > Useful for professional delivery specs. Can be toggled per job in the Export panel.


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