Veeery strange behavior, your help is very appreciated

[Matteo Pampolini]

Hello there, again Matteo from Italy.

I'm running GStreamer gst-launch application on Windows with all the 
sources built with MinGW 32. Pipeline is very simple, I'm just showing 
an MPEG4 video coming from an IP camera:

gst-launch-0.10 rtspsrc location=<RTSP URL> ! queue ! rtpmp4vdepay ! 
ffdec_mpeg4 ! d3dvideosink

Everything went fine with 0.10.35 series, i.e.: gstreamer and plugins 
base 0.10.35, plugins good 0.10.30, plugins bad 0.10.22, gst ffmpeg 
0.10.13, most important CPU load is around 3%.

Then I upgraded to 0.10.36 series, i.e.: gstreamer and plugins base 
0.10.36, plugins good 0.10.31, plugins bad 0.10.23, gst ffmpeg 0.10.13 
and CPU load now is around 27%, but this is not sistematic. I mean, it 
can happen (rarely) that CPU load is around 3% as above, but very often 
it goes up to 27%. With further Investigations with Process Explorer I 
found out that in the worst case there's one thread that consumes up to 
24% of CPU, while the rest goes normally. Since rtpmanager calls 
occurred often in the stack trace, I decided to recompile it with MSVC 
to get functions information and then the very strange behavior: with it 
CPU load is always OK, around 3% with no chance to reproduce the issue.

Frankly speaking I have no idea of what's happening, may you please help me?

Many thanks in advance,

Matteo
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