You can see alot of posts on adobe flash player forum like
Anything like YouTube, MySpace, that uses Flash to play sound is giving me nothing but sound works for everything else. Uninstalling and reinstalling doesn’t work. Installing an older version doesn’t work. This only started happening in the past week or so, and as far as I know nothing changed. Googling just gives me a bunch of people having the same problem but on Linux, so not much help there.
my pc don’t have audio only when i try to watch any website like youtube or any other music video i use to watch it but for some reason is not working,the weird think is that i i could play music or any video and i have sound, is only in the web, all my sound drivers are ok
Finally I found proper easy fix for Adobe Flash Player 9 missing sound issue for Windows XP – fixing some sound-related registry setting (wavemapper to be certain) simply worked.
Next, you can download my precompiled registry fix – zipped REG file for Windows. File listing:
Windows Registry Editor Version 5.00<br /><br />[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32]<br />“wavemapper”=”msacm32.drv”<br />
If you paranoid about downloads you can fix it manually, here’s how:
start regedt32 (Win+R, type “regedt32″), go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32 location and make sure you have wavemapper with value msacm32.drv
It looks like ffdshow codec causing trouble, remapping all audio codecs to itself.
Now hear youtube!
Fix flash no sound problem for Linux, Ubuntu, Mac
Main idea for flash sound problem fixing is to force your sound card to use software mixing (for particular application). Concrete solution will vary for different system setups. But the general steps for solving flash sound problem are:
– finding sound system configuration options
– creating specific configuration with software sound mixing enabled
– launching application with special sound profile
This problem is related to: flash no sound Ubuntu, flash no sound Mac, flash no sound Firefox, flash no sound Linux, flash no sound problem