How to fix audio problems with some codecs only?

Dell Optiplex 7010 bought in January, Windows 7 SP1 with all updates.

Sometimes during the month, I started to notice that some videos audio was very low and others had very distorted audio. This occurs when streaming video during playback of downloaded files and YouTube etc. A few videos where the sound was fine when I downloaded them are now distorted.

Other records and videos are fine, normal levels, no change by when I downloaded them.

The problem is not specific to any video site, player or plug-in. I can confirm by playing the same thing on other devices that the problem is not in the stream or file. So it seems that this must depend on which codec is used. This theory is supported by videos from the same source, generally having the same problem, or no problem.

I updated the Dell RealTek audio drivers, uninstalled them and used the generic Microsoft drivers, installed the RealTek drivers.

Audio troubleshooting of Windows detects no problem.

Disable sound effects has no effect.

Any suggestions on what else to try?

I guess I should install a 1394 PC card, plug my PreSonus audio interface and see if that has the same problem.

Here are some examples:

  • normal: https://www.youtube.com/watch?v=CvNGpdPdQCk
  • Audio clean but the level is about 10% of what it should be: https://www.youtube.com/watch?v=gX3jxkozqd8
  • level normal but distorted and voice is unintelligible: https://www.youtube.com/watch?v=eNPeOnsxICw

Never mind. The problem is in my hearing.

Tags: Windows

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