rtspsrc/rtpjitterbuffer: playback and seek is unstable if set buffering mode

Submitted by jihae

I'm running rtsp streaming on GST v1.5.2 release.

current default rtspsrc streaming does not raise buffering msg.
however, I need to get buffering msg from the pipeline.

However,if set "buffer-mode" property as buffering mode,
the rtsp streaming in buffering mode seems unstable.

for example uri,

gst-launch-1.0 rtspsrc location="rtsp://87.106.191.98/3gp/video/03.Video_H.263(16K)_AAC-LC(24k).3gp" buffer-mode="2" ! decodebin ! navseek ! xvimagesink
=> if doing pause and resume and seek , it is stopped with printing "buffering 0%".

or
modify gst/rtsp/gstrtspsrc. make 'buffer-mode' set to buffering mode.
after build& install.

Version: 1.5.2