For movie sountracks it's no big deal (it's not hard to adjust the volume between movies) but for TV episodes I like to keep the relative volumes the same. Not that it's likely to be huge, but it can happen. For the first track the volume won't change, but for the second it'll be increased, so the two tracks mightn't sound like they have the same average volume any more.Įven when converting "normal" video I don't use normalisation much myself these days, due to the possible variation is can cause between relative volumes. For example you might have two audio tracks which over-all have pretty much the same volume, but one has a loud section with peaks already at maximum level, while the other doesn't. The only possible downside of normalisation is it can change the relative volume between different audio tracks. If you think the audio level is a bit low then there's probably no reason not to use it (at worst it'll have no effect if the peaks are already at maximum), but otherwise it's up to you. If you're downmixing multichannel audio to stereo with MeGUI it probably pays to use it, as the formula MeGUI uses for downmixing has a tendency to reduce the volume, but when re-encoding stereo audio it's really personal preference. If the peaks are already at maximum, it'll have no effect. Often it'll increase the volume to some extent, but the whole audio has it's volume adjusted by the same amount. Normalisation (the type you can enable in conversion programs such as MeGUI and Staxrip etc) increases the over-all level so the volume peaks within the audio are at maximum.
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