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filter AVC NAL unit with type=0 (unspecified)
this fix some issues with particular streams
enhance TS parsing
if PMT not at the beginning of the fragment and some AV packets were left before, rewind and parse those AV packets.
this should help parsing bad segmented files
accurate seeking

when seeking,filter out audio tags with PTS smaller than seek PTS (dont append them to NetStream)
for video tags, set PTS=seek PTS if PTS < seek PTS

https://github.com/mangui/HLSprovider/pull/23
part 3