I need to get the average volume of the mp3 file in dB. This must be that when listening to multiple files automatically adjust the volume. In this case, the files themselves do not need to normalize. Ideally, I need to get a result in the command line, but fit and just an algorithm.
A:
Some answers here: http://stackoverflow.com/questions/1003413/calculate-mp3-average-volume
Could be useful: http://normalize.nongnu.org/
zaf
2010-04-13 14:55:23
I think in this case these tools are are not what the OP is looking for; they permanently alter the volume of the tracks. OP is simply looking for a way to calculate average volume of the file. If the include source code, however, they may still be worth a look.
isme
2010-04-14 19:07:15
+2
A:
The stat predicate of SoX gives all sorts of statistics about an audio stream.
Ignacio Vazquez-Abrams
2010-04-13 14:56:44
A:
Check out the Replay Gain standard. Audio players such as foobar2000 can apply the algrorithm to your ripped CDs or music collection to normalize the average volumes of tracks at track-scope or album-scope without changing the audio content of the files.
From the HydrogenAudio Wiki:
Replay Gain is the name of a technique invented to achieve the same playback volume of audio files. It specifies the reference level of 89dB and an algorithm to measure the perceived loudness of audio data.
Replay Gain allows the loudness of each song within a collection of songs to be consistent. This is called 'Track Gain', or 'Radio Gain' in earlier parlance. It also allows the loudness of a specific sub-collection (an "album") to be consistent with the rest of the collection, while allowing the dynamics from song to song on the album to remain intact. This is called 'Album Gain', or 'Audiophile Gain' in earlier parlance. This is usually important when listening to classical music albums, because quiet tracks need to remain a certain degree quieter than the louder ones.
Replay Gain is different from peak normalization. Peak normalization merely ensures that the peak amplitude reaches a certain level. This does not ensure equal loudness. The Replay Gain technique measures the effective power of the waveform (i.e. the RMS power after applying an "equal loudness contour"), and then adjusts the amplitude of the waveform accordingly. The result is that Replay Gained waveforms are usually more uniformly amplified then peak-normalized waveforms.
The wiki page also lists various implementations and related tools. Maybe one of these will be right for you!
isme
2010-04-14 19:25:21