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not compatible with sout, so was disabled
in that case. We also can remove it for
regular playback and just create an index
when people try to seek.

Rewrites handling of fragments in leafdemux.
refs #16832

breaks adaptive jumping from 0 pcr to moof's live offset

Offset gap was existing on seekable media
due to previously probed or seen moof

using p_block buffer size was broken since the conversion
occured between.

Also now uses stream_Block

Same usage as binary data

Otherwise can trigger a chunks read overflow

Makes main demux aware of interleaving, and avoid
access layer seeks. Also improves the large interleaves
and non interleaved playback.

Fixes the pcr jumps, as a min() dts based logic isn't
suitable for edit lists.

Improves empty edits handling by keeping demuxing on
empty samples time.

Adds continuity sequence counter,
like fragmented mp4 truns