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Cake day: June 11th, 2023

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  • Audio Engineer here. Not sure Ardour can open video, but it’s a capable DAW and open source. Reaper is closed source but it can open (and even render) pretty much any video format. To actually seperate a single voice, you do need additional plugins though, no matter which DAW you’re using.
    I think iZotope RX could do it, but it is fairly expensive. I haven’t seen any open source audio tools that can do this at all. It is pretty much guaranteed to require some kind of machine learning, as parametrically seperating by EQ or phase won’t work if you have only one source signal (even with two or more microphones, it would be really, really hard).
    A very good spectral editor might technically work, it would however take several days of manually deleting select frequencies on an almost single sample level and still sound bad, especially if the noise is nearly the same level as the signal.















  • .wav files store volume levels (typically, but often higher) as a 16bit value 44100 times a second (again, typically, but often higher). This allows frequencies up to 22050Hz to be stored without losses. A lot of this is useless information, because most people don’t hear anything above 16kHz, which only gets worse with age. Other parts of this might be useless information because of complex low frequency interaction with the inner ear which occlude some higher frequencies (psychoacoustics was a long time ago, can’t explain it in detail). .ogg and .mp3 filetypes, among others, use that to simply cut frequencies that (probably) aren’t heard. This process saves a lot of data, but results in lower resolution, especially in the higher frequencies (look up comparisons for 128kBit/s vs 320kBit/s MP3, you’ll hear the difference immediately on pretty much anything other than phone speakers.)

    If file size is an issue, .ogg is great, if quality is the most important, go for .flac, as flac files also don’t loose any quality while having file sizes between the two, though compatibility might be a problem on older systems.