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Old 29th October 2011, 21:19   #1  |  Link
VideoFanatic
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Increase Volume without Artefacts?

I recorded footage off the TV onto VHS then converted it to DVD. The audio had a background hissing noise so I removed it with an audio program. I then increased the volume in the audio program to match the level that commercial DVDs play at. But as you know with commercial DVDs you still have to turn the volume up on your TV to hear it at a decent level. So I also need to do that in my Video Editor.

My problem is that if I increase the volume in my video editor (VideoRedo) then the resulting file will have audio artefacts.
Why is it then if I just turn up the volume on my speakers that I don't have artefacts but if I change the volume on my video then the file that is output will have artefacts?

Is there any program that I could use to just increase the volume of my video without causing artefacts much like just turning up the volume on my speakers? Preferable I should be able to do this without re-encoding the file.
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Old 30th October 2011, 08:43   #2  |  Link
manono
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Does this thread have anything at all to do with MPEG-2 encoding (the subject of this forum)?
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But as you know with commercial DVDs you still have to turn the volume up on your TV to hear it at a decent level.
I, for one, don't know that to be true. You're comparing DVD volume levels with TV program levels? I'm not sure I agree.
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Why is it then if I just turn up the volume on my speakers that I don't have artefacts but if I change the volume on my video then the file that is output will have artefacts?
Because you introduced clipping into your audio?
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Old 30th October 2011, 13:43   #3  |  Link
VideoFanatic
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It's an MPEG-2 I'm encoding so I thought this was the correct thread for it.

I don't know what you disagree with - it's a fact. You can buy TV Series and Movies on DVD. Regardless of what DVD you buy, with all commercial DVDs you have to turn the volume up on your TV in order to hear it at a decent level. Try importing a DVD into a video editor to hear the true volume of it - the volume will be quite low.

How do I introduce clipping? In my audio program I matched the volume to the volume of a commercial DVD I bought. If I increase the volume of the commercial DVD in VideoRedo then I don't get the clipping artefacts but if I increase the volume of my MPEG2 then I do get artefacts.

So what I don't understand is: Why is it then if I just turn up the volume on my speakers that I don't have artefacts but if I change the volume on my video then the file that is output will have artefacts?
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Old 30th October 2011, 19:24   #4  |  Link
manono
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Originally Posted by holygamer View Post
I don't know what you disagree with - it's a fact. You can buy TV Series and Movies on DVD. Regardless of what DVD you buy, with all commercial DVDs you have to turn the volume up on your TV in order to hear it at a decent level.
I don't. Professionally made DVDs have the audio normalized and the volumes are usually correct. The fact that explosions and such are sometimes too loud for home viewing is a different issue.
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How do I introduce clipping?
By doing what you're doing - blindly jacking up the volume. Convert your louder AC3 with the artifacts back to WAV audio and then open it in Audacity or some such WAV editor and see if it clips.

I'm going to send this to the Audio Forum where there will be people that actually know something about the subject.
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