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mixer_lossless_video_processor_enabled=false

2. To display stream captions in mixer, it would be necessary to install fontconfig library

Symptoms: streams cannot be added to mixer with the following exception in server log

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09:17:11,756 ERROR           MixerAgent - MIXER-AGENT-mixer://mixervmixdr52-9d46cd04-5867-4d74-a9d9-baf67f74e7d2 Mixer closed due to error
java.lang.InternalError: java.lang.reflect.InvocationTargetException
	at java.desktop/sun.font.FontManagerFactory$1.run(FontManagerFactory.java:86)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:310)
	at java.desktop/sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:74)
	at java.desktop/sun.font.SunFontManager.getInstance(SunFontManager.java:247)
	at java.desktop/sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:265)
	at java.desktop/java.awt.Font.getStringBounds(Font.java:2606)
	at java.desktop/java.awt.Font.getStringBounds(Font.java:2516)
	at com.flashphoner.media.N.A.A.A(Unknown Source)
	at com.flashphoner.media.mixer.video.presentation.Canvas.computeTextScales(Unknown Source)
	at com.flashphoner.media.mixer.video.presentation.Canvas.writeNative(Unknown Source)
	at com.flashphoner.media.N.A.A(Unknown Source)
	at com.flashphoner.media.N.D.D(Unknown Source)
	at com.flashphoner.media.N.D.A(Unknown Source)
	at com.flashphoner.server.remote.B.B.Г™(Unknown Source)
	at com.flashphoner.server.remote.B.B.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
	at java.desktop/sun.font.FontManagerFactory$1.run(FontManagerFactory.java:84)
	... 14 more
Caused by: java.lang.NullPointerException
	at java.desktop/sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1262)
	at java.desktop/sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:225)
	at java.desktop/sun.awt.FontConfiguration.init(FontConfiguration.java:107)
	at java.desktop/sun.awt.X11FontManager.createFontConfiguration(X11FontManager.java:719)
	at java.desktop/sun.font.SunFontManager$2.run(SunFontManager.java:367)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:310)
	at java.desktop/sun.font.SunFontManager.<init>(SunFontManager.java:312)
	at java.desktop/sun.awt.FcFontManager.<init>(FcFontManager.java:35)
	at java.desktop/sun.awt.X11FontManager.<init>(X11FontManager.java:56)
	... 20 more

Solution: install fontconfig library

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sudo yum install -y fontconfig