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dll file may have been moved or renamed by another application.Ĭheck to see if you already have mmcss.dll on your computer.įor more information see how to search your PC for.

Did you know? You may already have this file even though you are getting.

Clean your registry and optimize your computer.

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Install all Windows updates and any available driver updates.

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Update the application to the latest version.

Re-Install the application that requires mmcss.dll.

Re-installing the application may fix this problem. This application has failed to start because mmcss.dll was not found. If the file is missing you may receive an error and the application may not function properly. They can continue to run if no low-priority threads are ready to run.When an application requires mmcss.dll, Windows will check the application and system folders for this. These threads have used their quota of CPU resource. They are guaranteed a minimum percentage of the CPU resources if required. This category contains the remainder of the threads. These threads are part of the application that is in the foreground.

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This category is designed for Pro Audio tasks. These threads run at a thread priority that is lower than only certain system-level tasks. This service also exists in Windows 7, 8 and Vista. If this service is stopped, individual tasks resort to their default priority. This is intended mainly for multimedia applications. Enables relative prioritization of work based on system-wide task priorities.

MMCSS sets the priority of client threads depending on their scheduling category. Multimedia Class Scheduler - Windows 10 Service. This folder is usually located on the drive where Windows is installed (for example, C: Users username Downloads). Downloaded mmcss.dll are automatically saved in the Downloads folder. Download Manager keeps track of images, documents, and other files downloaded from the Internet. How much CPU time is being consumed by the threads in each category. Method 1: Download mmcss.dll in our website now.Whether the application is in the foreground.The Priority parameter of the AvSetMmThreadPriority function.MMCSS determines the priority of a thread using the following factors: The MMCSS boosts the priority of threads that are working on high-priority multimedia tasks.

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For more information, see Performance in the Windows 7 Developers Guide. To conserve power, applications should not set the resolution of the system-wide timer to a small value unless absolutely necessary. This value can be set to Idle, Low, Normal, or High. This value can be set to High, Medium, or Low. The range of values is 1 (low) to 8 (high).For tasks with a Scheduling Category of High, this value is always treated as 2. Starting with Windows 7 and Windows Server 2008 R2, this guarantee was removed to reduce system power consumption. Windows Server 2008 and Windows Vista: The maximum guaranteed clock rate the system uses if a thread joins this task, in 100-nanosecond intervals. The range of values is 1-8.Ī hint used by MMCSS to determine the granularity of processor resource scheduling. The threads of a background task do not change because of a change in window focus. Indicates whether this is a background task (no user interface). Both 0x00 and 0xFFFFFFFF indicate that processor affinity is not used.

ValueĪ bitmask that indicates the processor affinity. OEMs can add additional tasks as required.Įach task key contains the following set of values that represent characteristics to be applied to threads that are associated with the task. By default, Windows supports the following tasks: The key also contains a subkey named Tasks that contains the list of tasks. Note that values that are not evenly divisible by 10 are rounded up to the nearest multiple of 10. For example, if this value is 20, then 20% of CPU resources are reserved for low-priority tasks. This key contains a REG_DWORD value named SystemResponsiveness that determines the percentage of CPU resources that should be guaranteed to low-priority tasks. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile The MMCSS settings are stored in the following registry key: Windows Server 2003 and Windows XP: MMCSS is not available. Each thread that is performing work related to a particular task calls the AvSetMmMaxThreadCharacteristics or AvSetMmThreadCharacteristics function to inform MMCSS that it is working on that task.įor an example of a program that uses MMCSS, see Exclusive-Mode Streams. MMCSS uses information stored in the registry to identify supported tasks and determine the relative priority of threads performing these tasks. This service enables multimedia applications to utilize as much of the CPU as possible without denying CPU resources to lower-priority applications. The Multimedia Class Scheduler service (MMCSS) enables multimedia applications to ensure that their time-sensitive processing receives prioritized access to CPU resources.