It is a fact that mp4gain is the only and central program that has all these functions and the one that is being used by amateurs and professionals. It even offers other functions like equalize, modifying the pitch without altering the tempo and vice versa. Little by little, as the video becomes more and more a central guest on the web, people will use the Mp4Gain more and more to maintain their volume levels without increasing or decreasing. In fact it is the only software that is capable of doing this. You can normalize the audio of an mp4, normalize the audio of an avi, etc. Mp4Gain arose to normalize the volume level of the main audio formats but ALSO in the main video formats. THE YOUTUBE BOOM AND THE VIDEOĪnd then the video had a boom (this boom is here to stay) and little by little, with the passage of time, people began to get used to a new format, mp4.īUT the same volume issues soon arose in the mp4 audio as well as the major video formats. None have yet fully competed with mp3, but genwro that programs like Mp3Doctor were able to normalize other audio formats as well, not just mp3. In addition, with the passage of time, other audio formats emerged. nor was it entirely efficient and satisfying. The idea of replaygain came up, which gained a lot of popularity. Little by little, they began to have new ideas and new approaches to face this disparity in volume levels that affected mp3s in a very notorious way. Initially, normalizers emerged in a naive way based solely on volume peaks. Bad settings here can lead to "pumping" sounds, also depending on the content.Some years ago, I started a desperate race to equalize, level, normalize or boost the volume of the mp3s.Īt the time that people downloaded dozens or hundreds of mp3s, it was quite apparent that there was a problem with the volume. Normally, you want a low attack time and a larger release time. Attack/Release times: Experiment with those.Too high values might make the track sound unnatural, though. Ratio: The ratio should be rather high.If you have very silent parts, you should set the threshold so that the compressor is active most of the time Threshold: The threshold is the loudness level at which the compressor kicks in.Here are some guidelines for its settings (depends on the file though, so you should just experiment and see what works best for you): It has a built in compressor which you can use to reduce the dynamic range. I would go ahead and extract the audio signal from the video and then open it in a tool like Audacity. The downside is that sometimes you hear that the chorus parts of a song (those that should sound louder) have less volume than the other parts. This is what radio stations do frequently: They apply heavy compression to their broadcast tracks so they will sound good in loud environments like cars, etc, and also sound good when listened to at lower volume levels. Compression means that the dynamic range of the signal will be reduced, so that loud parts and silent parts are "closer" to each other and the difference will not be so obvious anymore. What you need to do is compress the audio signal. So that's true, "simple normalization" doesn't do the job here. That means the loudness difference between silent and loud parts will still be the same as before and therefore audible. If you say that the video track has different volume levels, normalization will maximize the general amplitude of all parts at the same time, so that the loudest part (the peak) goes to 0dB or less, depending on the implementation. Normalization is not what you're trying to achieve.
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