Any way to test an audio file for resampling/bit-depth conversion?

[BusterD]

Like the title says, I'd like to test some audio files to make sure they are actually 24-bit/96kHz and haven't been upsampled/converted by Windows or the recording software. Pretty sure I have everything set up now for correctly capturing audio at 24/96 (Audacity is set to WASAPI and will give an error when trying to record something at 96000hz if the hardware is set to a different rate), but would like to test some of my older files in case I didn't record them properly back then.

I know that one can just run a .wav file through eac3to to see if it has padded zeroes, but haven't been able to find any info on checking files for resampling or bit-depth conversion.

[deleted user]

Audition can do an analysis pass of the file giving you various information including "Measured Bit Depth". Not sure if that helps.

[pipefan413]

Audition can do an analysis pass of the file giving you various information including "Measured Bit Depth". Not sure if that helps.

Is that not the same thing eac3to does when it reports whether it's padded with zeroes or not? As in, if it's actually 16-bit but padded with zeroes up to 24-bit or whatever. (My Decklink records 20-bit padded to 24 for example.)

I'd guess you could theoretically tell from spectrograph if it had been a lower bit depth resampled upwards... if the original source audio had actually been producing frequencies that only 96 kHz can reproduce. But I don't think LD audio does, unless I'm mistaken, so I'm guessing the 96 kHz isn't capturing anything useful in terms of frequency response but is theoretically useful for editing precision and later resampling. (What I mean is, if it had been say 44.1 kHz resampled up to 96 kHz you wouldn't see much in the very highest freq bands but recording natively in true 96 kHz you would.)

[deleted user]

Yeah it's possible it's the same thing. Oh and then there's also Lossless Audio Checker, which I think can also detect resampling.

[pipefan413]

Yeah it's possible it's the same thing. Oh and then there's also Lossless Audio Checker, which I think can also detect resampling.

*That* sounds like the ticket! Thanks, that's potentially really handy, I'd never heard of it.

[BusterD]

Ah, interesting, thanks again Tom. Just searching for that tool brought up some other software as well, will have to check these out sometime soon.