fix: fix instance segmentation exiting due to decode issue

[antoniomtz]

PR Checklist

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• Every commit is a single defect fix and does not mix feature addition or changes
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What are you changing?

Issue this PR will close

close: #issue_number

Anything the reviewer should know when reviewing this PR?

Test Instructions if applicable

1. Rebuild python apps: make build-python-apps
2. Run camera simulator
3. Run instance seg pipeline: PIPELINE_PROFILE="instance_segmentation" RENDER_MODE=1 sudo -E ./run.sh --workload ovms --platform core --inputsrc rtsp://127.0.0.1:8554/camera_0

Instance segmentation pipeline doesn't exit after few minutes.

If the there are associated PRs in other repositories, please link them here (i.e. intel-retail/automated-self-checkout )