Win7 video playback no sound solution

Local player listening to songs and movies have sound but it plays the flash of Tudou, Youku, Yo and other websites, as well as RMVB and WMV videos in online movies, there is no sound. The music on the web page can't be heard. 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 problems, solve them 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 installed and uninstalled. Kind of decoder 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 ldquo ; 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 the 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, windows
7 will open “sound and audio device properties”, select “put the volume icon into the taskbar", and there will be a sound.