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flvdemux: Use DTS for the video segment position

Jan Alexander Steffens requested to merge heftig/gstreamer:gst-plugins-good-flvdemux-dts into main

Copied from https://gitlab.freedesktop.org//gstreamer/gst-plugins-good/-/merge_requests/395

When we start with a video frame with a presentation offset, this ensures our initial frames (video or audio) don't fall outside the segment and get clipped later.

A simple remuxer now keeps the right timestamps:

gst-launch-1.0 \
  filesrc location=$HOME/foo.flv ! flvdemux name=d \
  d. ! queue ! h264parse ! m. \
  d. ! queue ! aacparse  ! m. \
  flvmux streamable=1 name=m ! filesink location=$HOME/bar.flv

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