Hi Matt, Here's a Python script which analyses a set of files in a specified folder. They have to be file formats understood by libsndfile - which allows for flac/wav/aiff and some others, but not mp3. It takes maybe 5 to 10 seconds per track, but eventually it produces a plot as a PNG file. https://gist.github.com/danstowell/8872466 (Also blogged: <http://mcld.co.uk/blog/blog.php?417>) Best Dan 2014-02-05 Matt Garman <matthew.garman@xxxxxxxxx>: > > I have a collection of FLAC files, all ripped from my CD collection > What I would like to do is run an analysis across all the music to > determine how the bass/lower frequencies are generally mixed. For > example, how much content below (for example) 150 Hz is on the left > channel versus the right channel? > > I'm not sure if "histogram" is the right word, but in my mind what > I'd like to see, per-channel, is something like this: > > 150--125 Hz: x samples > 125--100 Hz: y samples > 100--80 Hz: z samples > ... > > Then I can look at the two channels of a song, and if the histograms > are approximately the same, I can assume the bass was mixed equally > to both channels. > > I am a programmer, and thought it would be easy to quickly hack > something up that would do this, but I have no experience with > signal processing, and as I started reading about this, I quickly > got in over my head! So I was hoping there might already exist a > tool that has this functionality. > > Note that I don't need any kind of graphical output, as this needs > to be wrapped up in some kind of batch processing script---I have > about 11,000 files to analyze! > > The motivation for this is: I have a hardware DAC (digital audio > converter) in one part of my house, and a subwoofer in another. > There is a single coax run between the DAC and subwoofer, so I can > only send one channel. If the overwhelming majority of my music has > the bass mixed equally, sending only one channel isn't a problem. > But if I choose the "L" channel to send to the sub, and much music > has the bass mixed only to the "R" channel, then I won't be able to > hear the low frequencies. I want to find out how often this might > happen. > > Thanks, > Matt > > > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-user -- http://www.mcld.co.uk _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
