intel / intel/libva

lots of noise when a media stack sample is run under valgrind

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Description

Running without rate control, valgrind run is almost flawless:
```
valgrind --leak-check=full /opt/intel/mediasdk/share/mfx/samples/_bin/sample_encode h264 -i tango_very_short.yuv -o tango_very_short.yuv.h264 -w 1920 -h 1080
```

```
valgrind --leak-check=full /opt/intel/mediasdk/share/mfx/samples/_bin/sample_encode h264 -f 25 -icq 32 -la -i tango_very_short.yuv -o tango_very_short.yuv.h264 -w 1920 -h 1080
```

Tried with quite a few MediaStack, downloaded from this repo. The problem seems... kind of consisting.
Am I doing something wrong?

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