ALLPlayer.org

Solution: The problem is Real Player which has its own codecs making mess in the system.
The best thing to do is to uninstall Real Player - then reinstall the latest Real Alternative package manually by checking the entry in LiveUpdate advanced and it should work.

Solution: Go to sound settings in the AC3Filter:

1. First, check how many channels are in your movie file - (1) - shows that the sound is on all 6 channels, that is OK.
2. Set in output format AS IS (2)
3. If you have your computer connected to an amplifier with digital or optical connection, select "SPDIF". Sound will not be processed on the computer, but will be directly sent to your amplifier. It much improves the quality of sound - (3)

If you do not have the Audio 5.1, but stereo, you have to set output format to: 2/0 stereo - (1), It would set the sounds like dialogues to the paths that your equipment is able to play. If you don't do that, many of the sounds of the channels which you don't have (eg sounds of rear loudspeakers or dialogues) won't be heard or will be scarcely audible.

Solution: Some HD files require Video EVR Output - click on the panel on "Filters" -> "Video Output" -> "EVR"

Solution: Go to LiveUpdate check “to delete” -  DirectVobSub.