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Poor Quality Audio in MP4 Video's

Since installing Windows 8, the audio quality in any MP4 files is distorted and echoes.

This happens regardless of what player I use to view them (You Tube, iTunes, Media Player). If I play a professional video in You Tube it is OK.

All other types of video are fine and all other sound output is fine.

If I transfer the same video to my HTC phone the sound quality is normal.

Can anyone help please????

My Computer

System One

  • OS
    Windows 8 Pro
    System Manufacturer/Model Number
    Acer Aspire 5349
    Intel Dual Core B800
    Graphics Card(s)
    Intel HD Graphics
    Sound Card
    Realtek HD Audio