- For audio/video, we should report the minimum largest
queued timestamp. This ensures that buffering continues
rather than stops in the case of bad sample interleaving.
- If there are "sparse" tracks then they should be ignored
for this calculation, otherwise the buffered position can
end up getting stuck at some small value (e.g. if there's
a text track containing a single sample with a small
timestamp).
- In the edge case that there are only "sparse" tracks, we
probably want to take the maximum largest queued time
instead.
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