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mpegtspacketizer: memcmp potentially seen_before data

Vivia Nikolaidou requested to merge vivia/gst-plugins-bad:mpegts_memcmp into master

Theoretically the version number is incremented every time there's a new section, but in a world of streaming we can't easily make that assumption.

An example of a broken use case is when we're cat-ing two mpeg-ts files together, which is equivalent of capturing a DVB stream while switching channels. A set-top box would know that we switched the channels and reset the demuxer, but in practice this might not happen.

Edited by Vivia Nikolaidou

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