DLP does not check streams thoroughly, only reads headers and relies on this information.
That makes DLP fast, but not foolproof.
With DLP as compressionist I am anyways responsible to know what I'm doing.
DLP tends just to warn about OpenGOPs, (which is a bit unnecessary and can be turned off) and muxes happily on.
For Film on DVD (23.976p soft pulldowned to NTSC 29.97i) a GOP size of max 14, better 12 is recommended.
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