Is the following 100% correct?

PAL colors are called "BT601-625".
For PAL DVDs for which showinfo shows
  color_space:unknown color_primaries:unknown color_trc:unknown
the source's color attributes should be forced by
  -colorspace bt470bg -color_primaries bt470bg -color_trc gamma28

NTSC colors are called "BT601-525".
For NTSC DVDs for which showinfo shows
  color_space:unknown color_primaries:unknown color_trc:unknown
the source's color attributes should be forced by
  -colorspace smpte170m -color_primaries smpte170m -color_trc smpte170m

For both BT601-625 and BT601-525 sources, BT709 targets can be set in
filter_complex by
  colormatrix=src=bt601:dst=bt709,colorspace=all=bt709

Specifically, smpte170m, as shown in colormatrix
  colormatrix=src=smpte170m:dst=bt709
is not used.

Thanks -- Mark.
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