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With no colour tags, FilmCraft decodes with BT.709 transfer and primaries and the matrix by frame size, and probe and media.colorInfo showed those values with nothing saying they were defaults, so an untagged file looked the same as one tagged BT.709. VideoStreamInfo gets color_assumed (optional, left out when unknown): which of the matrix, transfer and primaries no tag in the file gave. MP4/MOV and Matroska take it from the same sources as the colour, APV from its colour description, and AVI, MXF and Y4M mark all three. probe prints it as video.color_assumed and media.colorInfo as assumed, next to the unchanged metadata. Co-authored-by: Brandon Thomas <echelon@gmail.com>