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Still not convinced...
So far Mr. Waggoner seems to be the only person to make this statement (and he may be wrong). The original DVD specs are not public, and everybody else (like DVD Demystified and others plus several encoder manuals) seem to agree that the Progressive Sequence flag is not illegal for DVDs.
Of course you cannot set the Progressive Sequence flag if you also set the TFF flag, this is in fact illegal.
Just for fun I checked all the MPEG2 encoders on my HDD, and this is how they behave:
Libavcodec based encoders (FFMpeg and QuEnc):
Both the Progressive Frame Type and the Progressive Sequence flags are set.
ProCoder 2 and 3:
Exactly the same behavior.
CCE SP 2.5 and 2.67:
Progressive Sequence flag not set, but Progressive Frame Type plus the TFF flags are set.
HCenc:
Also sets Progressive Frame Type and TFF flags when the "progressive" option is used. The Progressive Sequence flag can be specified separately.
Another strong indication that the Progressive Sequence flag is legal for DVDs is that MuxMan accepts these streams for authoring. I always found that if MuxMan accepts elementary streams for authoring, then these streams are 100% DVD compliant.
Cheers
manolito
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