It is now guaranteed that each fragment is at most fragment-duration
long unless the one and only GOP of the fragment is longer than that.
The first (non-EOS) stream determines the duration of each fragment and
all other streams are drained to at most the fragment end timestamp
determined this way.
In addition the next fragment's target time is now at the end of the
previous fragment plus fragment-duration instead of using
first-fragment + N*fragment-duration
regardless of where fragments were split before.
That is, fmp4mux now uses the same strategy as used by splitmuxsink and
as is required e.g. by HLS with regards to the target duration.
This reverts commit 402500f79c.
This commit introduces race conditions. It was intended as solving
an issue with some pipelines which had their queues filling up,
causing the streams to stall. It is reverted as this solution is
considered a workaround for another issue.
See discussion in:
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/803
