Any way to make our sound level auto-adjust?

Hi,
Is there an applic or whatever that ensures sound always comes out of our speakers at a comfortable level,ie not too quiet and not too loud?
It's a real hassle having to constantly twiddle our speaker volume knob up and down to suit a series of individual videos etc.

Wow, no replies, so I assume we have to twiddle the volume knobs ourselves!
There's obviously a gap in the market for a prog that auto-adjusts our vol to a pre-determined level, my cash is waiting..

volumes are different because of different bit rates in the audio. the process you are talking about is called normalization. there are apps that claim they can do this. the problem is you cannot take low bit rate and drive the volume up, it will not sound good. therefore these apps will lower the quality of your good audio files to the lowest bitrate file.
google normalization audio and try whats available. it may turn out to be what you are after and the sound quality may not be an issue to you.

Okay thanks i'll have a dabble..

The central issue is that video audio is recorded at widely different volume levels. Basic recorders may have no recording volume control but some sort of automatic leveling that prevents clipping. That can result in flat audio. Even TV programs vary hugely by program and station. Video from different sources is highly variable in both volume and content. Trying to get a standard level is best explained in terms of mp3 music files and software.

In any music track, you may have quiet passages, loud drumming, overdriven guitar that produces annoying odd harmonics etc. Somehow you have to try and make it all an acceptable level while not making it a monotone or inaudible. The way mp3 normalizers work is to review the entire track volume levels, and have some formula for working out how to compress it to "normal". The "track gain". To make an entire set of mp3 tracks sound OK together, you then have to compare the new "normal" levels of each track and adjust relative to the others. The so-called "album gain". To get decent normalization, the software has to go through all the mp3 tracks. Ultimately it's a subjective "best guess".

If one is trying to get normalization solely on video playback, the results will not be as good as noted above. It can only work with the current video. Some players have a normalization feature, see:
VLC player normalization
Such software/hardware must either review the track before playing or have a variable gain that progressively limits volume as it approaches 100% or increases as it approaches 0% (making the audio sound flatter). I can't speak for how it works in VLC player. These days we can at least be thankful that most systems have a remote control!

It is also depends on everyone who like to listen song with related sound. I always make our sound auto adjust for best music and also making good music for the related sound. I always listen some soft volume and make good player of the sound track.