- Update to version 82.0
  New features and enhancements:
  * mkvmerge: Matroska reader: the "video alpha mode" track
    header property will be copied to the output file if present.
  * mkvmerge: Matroska reader: the "video alpha mode" track
    header property will be reported in JSON identification mode
    as the track property `alpha_mode`.
  * mkvmerge: Matroska reader: the file's timestamp scaling
    factor will be reported in JSON identification mode as the
    container property `timestamp_scale`.
  * mkvmerge: MPEG transport stream reader: teletext subtitles
    intended for hearing impaired people (type 0x05) are now
    marked as such via the appropriate flag in the track headers.
  * mkvmerge: file identification: the JSON identification
    output schema version has been bumped to 19.
  * mkvmerge: added a new hack `always_write_block_add_ids` that
    can be used as a workaround for players that don't support
    the handling of missing "Block Addition ID" sub-elements of
    "Block More" elements in block additions properly. These are
    used for e.g. alpha channel data in VP9 with a "Block
    Addition ID" value of 1, which is also its default value.
  * mkvinfo: added support for the "video alpha mode" track
    header element.
  * mkvpropedit, MKVToolNix GUI's header editor: added support
    for the "video alpha mode" track header property. In
    `mkvpropedit` it's called `alpha-mode`.
  * MKVToolNix GUI: multiplexer: when adding files the GUI can
    automatically enable the "hearing impaired" flag for audio
    and subtitle tracks if the file name contains the word "cc"
    or "sdh" delimited by certain characters (configurable).

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