[QUOTE=Albert;2782969]Are you sure there’s no re-encoding? It is possible to pull the audio, do a quick normalization or volume boost, and remux with no noticeable quality loss, and no need to re-encode the video part.
My conventional knowledge tells me you have to open the audio file in some sort of application (like Audacity), tweak the audio, and encode the audio with the adjusted volume. Outside of that, the only on-the-fly audio adjustments I’ve seen were done on a per-app basis. (For example, iTunes allows you to nudge the volume up or down by a little, and will remember that setting for that bit of audio, but the change doesn’t really get applied anywhere else.)[/QUOTE]
I have used it numerous times now and checked that the volume has indeed been boosted. You can optimize one file or a batch of files by adding the file or drag & drop into the window.
Free Video Volume Booster is a free software used to quickly increase the sound volume of any video file. It supports almost any video format, including AVI, DIVX, XVID, MPEG, MPG, MKV, RM, RMVB, FLV, MOV, MP4, ASF, WEBM, etc. Due to its simplicity, Free Video Volume Booster can be used by everyone, just select the video files, increase the audio volume of N decibels (we recommend a value between 10 and 20) and then click the button â€œOptimizeâ€.
Just to let everybody know I’m not associated with this in anyway, I just know it works. You put the original file in and when it’s done the original file is untouched and the new file opens in a window you designate.