These are registered identifiers at the MPEG-4 RA, which are
defined as to be utilized for Dolby Vision AVC/HEVC streams that
are not correctly presentable by standards-compliant AVC/HEVC players.

According to the Dolby Vision specification for ISOBMFF, these sample
entry codes are specified to have the standard AVC or HEVC decoder
configuration box in addition to the Dolby custom DOVIConfigurationBox.
This is what enables us to decode the streams without custom parsing.

For correct presentation information from the DOVIConfigurationBox
is required (YCbCr or modified ICtCP, SDR or HDR, base or enhancement
layer).