PLUSPTYPE is
absent for short header mode of MPEG-4 Pt2 decoder, the H.263 compatible mode
of MPEG-4 Pt2 decoder.
Though PLUSPTYPE
can have custom resolution besides the limited 5 resolutions in short header
mode of MPEG-4 Pt2 decoder, it is often not supported by commercial H.263 or
MPEG-4 Pt2 decoders.
That is, when
video contents are encoded in H.263 format, it’s better to not use PLUSPTYPE
for compatibility, and be play-able on most devices.
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