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. alpha channel data in VP9 with a "Block Addition ID" value of 1, which is also its default value. 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.
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