Be sure that you selected the correct output device in Preferences /Audio tab, usually it's : (Default).
Using [Up] key, OSD should display 100%.
If dedynamic is installed, be sure settings are set to default (100%, 3dB)
I dont think it's the right solution, 'coz you tell that the movies are OK with other players but if nothing works then download dedynamic 0.2 at
Doom9.
- put it in BSPlayer\filters
- check the option to enable BSPlayer to use it in Preferences /Audio Tab
- tune the volume using ctrl up/down and shift up/down
Dedynamic doesn't work with all the audio output devices, you have to select the good one.
Each time you change the device, you have to quit and reenter BSPlayer to ear dedynamic settings effects.
Dedynamic add distortions, the higher the amplification, the worse is the quality but if you need it, it's better than earing nothing.