Open up the movie file you wish to view.
Right-click the viewing window and select "Audio."
Locate the box next to "Normalize" and click it. Then click "OK" to save your settings.
Open the video file you wish to watch.
Select "Options" from the program toolbar and then select "Audio Preferences."
Set your default volume to "200%" and set Replay Gain to "None." Check the box next to "Volume Normalizer" and then set the Normalizer option to "0.5." You can adjust the normalizer value higher or lower depending on the desired volume.
Right-click the video file you wish to view.
Select "Preferences" from the right-click menu.
Select the "Playback" tab.
Click the box next to "Sound Check." Then click "OK" to save your changes.