Head-mounted display adjustment methods and systems

A method comprising:

• receiving a user input comprising at least one viewing condition parameter, and a stereo video stream and metadata corresponding to the stereo video stream, wherein the metadata includes an indication of disparities between a corresponding left view and right view of the stereo video stream;
• determining, with a decoding device, a comfort threshold based on the viewing condition parameter, the comfort threshold indicating a range of disparities that fall within a zone of comfort;
• computing a post-processing factor based on the metadata and comfort threshold, the post-processing factor comprising one or more of a scale factor and a shift factor;
• and
• applying the post-processing factor to the stereo video stream by:
• scaling a corresponding left and right view of the stereo video stream using the scale factor, and/or
• shifting the corresponding left and right view of the stereo video stream using the shifting factor, wherein a shifting includes shifting a left view towards a corresponding right view or shifting the left view away from the corresponding right view.