Win7 video playback no sound solution

local player listening to songs and movies have sound but it plays the video of Tudou, Youku, Yo and other websites, as well as RMVB, WMV video in online movies, no sound, in the webpage Music can't be heard anymore. You can hear the sound by playing videos, music, and FLASH animations on your hard disk. It can be concluded that this has nothing to do with the driver. Reinstalling the system driver will not help. If you have encountered such a problem, solve it together:
This problem is also very common in Windows XP/Vista. It is not related to Windows 7. Generally, what optimization software is used or various decoders are installed and uninstalled. Caused.
To solve this problem, click “Start"Menu→“Run" Enter “regedit” and press Enter to open the Registry Editor, click on the left pane and click "HKEY_LOCAL_MACHINE\\" SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Drivers32”, then check in the right pane for the value of "wavemapper". If not, right-click in the blank space on the right pane to create a new string value called “wavemapper”, and then double-click the value to set its “Value Data” as “msacm32.drv”, Restart your computer to resolve the issue.
Tip: If there is no sound after setting according to the above method, please check if there is a volume icon in the system tray. If not, windows7 will open “sound and audio device properties", select “ put the volume icon into the taskbar & rdquo;, then there will be a sound.