General

Possible solutions:

• Blacklist your game in ffdshow. This prevents ffdshow from being used by your game.
  Find out the filename of the main executable of your game. For example 'oblivion.exe'.
  Go to: ffdshow video decoder configuration -> DirectShow control
  Check the box in front of "Don't use ffdshow in:". Press the 'Edit' button behind it and add the filename to the list.
  Repeat these steps for ffdshow audio decoder.
• Disable the Elecard MPEG-2 demuxer (if installed). You can do that with the K-Lite Codec Tweak Tool.
• Use the Fraunhofer DirectShow MP3 decoder instead of ffdshow for decoding MP3 audio.
• Disable the Nero audio decoder filter (NeAudio.ax).
  You can do that this way:
  Start -> Run -> regsvr32 /u "C:\Program Files\Common Files\Ahead\DSFilter\NeAudio.ax"
  Alternatively, you can use the K-Lite Codec tweak Tool to disable it.
• Update your graphics card drivers.

Here are some things you can try to solve the problem:

• Flash stores its files in a temporary files folder. A corrupt download can cause the sound problems.
  
  Delete the following folder:
  C:\Documents and Settings\%UserName%\Application Data\Adobe\Flash Player
  C:\Documents and Settings\%UserName%\Application Data\Macromedia\Flash Player
• Empty your temporary internet files.
  
  Internet Explorer: Tools -> Internet Options
  Firefox: Tools -> Clear Private Data
  Opera: Tools -> Delete Private Data
• Empty your temporary files folder.
  
  Use this command to empty your temporary files folder:
  Start -> Run -> RMDIR /S /Q "%TEMP%"
  
• Install the latest version of the Flash plugin. You can download it HERE. If you have problems upgrading the plugin, then uninstall your existing version first with this tool. Close your browser(s) before you run the uninstall tool.
• Run the K-Lite Codec Tweak Tool. Near the top you should see an option to fix the sound (Midi, WaveOut). Select that and press Next. If the option is greyed out, then that particular registry fix is not needed.
• Go to the Flash Player Settings Manager website. Click HERE.
  Check the box called "Allow third-party Flash content to store data on your computer."
• Check if your sound device settings are correct:
  Start -> Settings -> Control Panel -> Sound and Audio Devices -> Audio
• If you have QuickTime installed, then go to the QuickTime control panel. On the Audio tab, set "Default Music Synthesizer" to "General MIDI".
  On the Advanced tab, disable "Enable playback of Adobe Flash tracks".
  On the browser tab, click on "MIME Settings". Under "Miscellaneous", make sure "Flash media" is unchecked.
• Check if the file msacm32.drv is present in your Windows system32 folder. If not, copy it from another PC (that has the same version of Windows) and place the file in the system32 folder.
• If you are also having sound problems with other applications, then re-installing your audio drivers might solve the problem.
  

If you get "INTERFACE NOT SUPPORTED" errors with AVI files, then enable Gabest AVI splitter during installation of the K-Lite Codec Pack.

If you get "Floating point division by zero" errors on files with AC3 audio, then go to AC3Filter options and set Master volume, Gain, and Surround levels to their default values (= 0).

This application seems to be incompatible with Haali media Splitter.

Disable "MPEG TS splitter (Haali)" with the Codec Tweak Tool. Then you should be able to open your files in Sony Picture Motion Browser.

In order to be able to play .m2ts and .ts files in your regular player you should re-enable the splitter when done using the Sony application.

Take a look at the guides section of Doom9.org

Premiere loads a new instance of ffdshow for each video segment that you play. But it fails to properly unload those instances. You can solve this problem by adding 'premiere.exe' the the ffdshow blacklist. Then ffdshow will no longer be used by Premiere.

ffdshow video decoder configuration -> DirectShow Control -> Click on the Edit button behind "Don't use ffdshow in:" -> Add "premiere.exe" to the list.

You do need to have an alternative decoder installed that Premiere can use instead of ffdshow. For example the DivX and Xvid VFW codecs.