[Bug 797133] qtmux: Allow up to 1 audio sample of lateness in prefill mode

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797133

--- Comment #1 from Vivia Nikolaidou <vivia at ahiru.eu> ---
Created attachment 373621
  --> https://bugzilla.gnome.org/attachment.cgi?id=373621&action=edit
qtmux: Allow up to 1 audio sample of lateness in prefill mode

For 59.94 FPS, it's common to set 60000 as timescale. For that
timescale, if the audio is late by as little as 0:00:00.000016666
(definitely less than one audio sample), lateness gets rounded to 1.
Added a safeguard that allows lateness up to 1 sample with the specific
trak's timescale, to make sure that values less than one audio sample
won't break the prefill mode. What will happen in this case is that the
audio will get squeezed back to the video's timestamp, which in practice
means that the audio will be 0.000016666 seconds early (with the patch).

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