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Solution: since build 5.2.1690, use m4s container for audio only streams

13. Encoder resources leak may appear under a high load when using HLS ABR

Symptoms: when HLS ABR is used and server CPU load is high (for instance, an encoding profiles number for all the streams published exceeds CPU capabilities), encoding resources may not be freed after publishing is stopped, and this may be visible on server statistics page, for example

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themeRDark
streams_hls=0
...
native_resources.video_encoders=5

Solution: update WCS to build 5.2.1947 and set the following parameter

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themeRDark
handler_async_disconnect=false