Why some songs or videos play loud and others play low volume?
First of all, a correction, the concept of “recording level” should not be used here, because the music released is not the original dry material.
Most commercially released music (except for special types such as classical) has been subjected to Maximize processing, which is equivalent to extreme compression processing, which reduces the dynamic contrast between loud and soft music and improves the overall level. “loudness war” in the industry.
However, not all music has the same dynamic, some music can make the dynamic fluctuation very small, but some can’t. For music that requires high dynamics, if the overall level is increased, the peak part will cause the level to overload, so the average level is reduced by the gap between the maximum level and the lowest level. medium loudness to judge the volume. Yes, in this way, we will feel that the volume of some music is “low”.
Also, some files downloaded from the Internet will have the Earning Tag parameter. If your player reads this parameter, it will adjust the relative level of the output via gain compensation, because the amount of gain compensation is different for different files. , so the volume goes up and down.
The solution? Mp4Gain that manages to avoid these differences in volume levels, not only in mp3, but in many audio or video formats.
