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How to Start/Stop Multimedia Class Scheduler service

Service name: MMCSS

Display name: Multimedia Class Scheduler


Description:

Enables relative prioritization of work based on system-wide task priorities. This is intended mainly for multimedia applications. If this
service is stopped, individual tasks resort to their default priority.


Path to executable:

C:\Windows\system32\svchost.exe -k netsvcs

CMD:
This method shows you how to Start/Stop Multimedia Class Scheduler service from Command Prompt

Please perform the following steps:

Please go to Start and click on the Search programs and files

Type cmd, right click on cmd icon under the Programs and click on Run as administrator

Please confirm User Account Control pop-up

Please select, right and copy a registry key from below, then right click on command prompt window, select Paste and press Enter


To Start Multimedia Class Scheduler service:

net start MMCSS


Note: You can’t start a service if Startup type is on Disabled.


To Stop Multimedia Class Scheduler service:

net stop MMCSS


To change Startup type:

Automatic:

REG add "HKLM\SYSTEM\CurrentControlSet\services\MMCSS" /v Start /t REG_DWORD /d 2 /f

Manual:

REG add "HKLM\SYSTEM\CurrentControlSet\services\MMCSS" /v Start /t REG_DWORD /d 3 /f

Disabled:

REG add "HKLM\SYSTEM\CurrentControlSet\services\MMCSS" /v Start /t REG_DWORD /d 4 /f

Automatic (Delayed Start):

REG add "HKLM\SYSTEM\CurrentControlSet\services\MMCSS" /v Start /t REG_DWORD /d 2 /f


Note: When you change to Automatic (Delayed Start) a new key DelayedAutostart is created with value 1.

REG add "HKLM\SYSTEM\CurrentControlSet\services\MMCSS" /v DelayedAutostart /t REG_DWORD /d 1 /f


When you change to Automatic from Automatic (Delayed Start), DelayedAutostart change value to 0.

REG add "HKLM\SYSTEM\CurrentControlSet\services\MMCSS" /v DelayedAutostart /t REG_DWORD /d 0 /f

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