Queue2 buffering query buffer timestamp

[rland]

Hi,Experts,
AFAIW, playbin3 urisousebin uses queue2 to implement network buffering.
In most network streaming cases, queue2 and its upstream, has no buffer
timestamp information.
The file encoded bitrate and network real-time download bitrate may be very
different. 
Therefore, according to the max-size-bytes to control the buffering,it seems
there will always 
be various problems.
For example 4K files,if the max-size-bytes is smaller, frequently buffering,
and relatively low bitrate files play well.
On the contrary, if the max-size-bytes  is set to a higher value , low
bitrate file will take a long time to wait 
start playing.

My doubt is,  is it possible that GStreamer framework to provide a mechanism
for Queue2 to query buffer timestamp information from
downstream(demuxer,parser? ) for a convenient and accurate calculation of
max-buffer-time? 
The details may be more complicated, but this indeed be necessary.





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