High frequencies get cut?

Hey there!

Kudos for the project – the results are pretty impressive already!

However, I noticed the default 2-stem model and the 5-stem model seem to cut higher frequencies from the material, like a (Nyquist?) knife really. I ran spleeter on a certain US pop star’s song about temperature differences, i.e.

spleeter separate -i hot_n_cold.wav -o . -c wav

where hot_n_cold.wav is a pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s stream, then jury-rigged this A/B test environment in FL Studio where one can compare the original version and the summed stems. You can probably tell from the spectrogram in the below screenshot where I flipped the crossfade slider over to the Spleetered (Spleeted?) version.

The output stems are pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s, so it’s not like the file itself is at fault here.

Is this expected? Can this be tuned/changed somehow?

[vkharatmal]

@khaleelyo

Try using this cmd :: python3 -m spleeter separate -i audio_example.mp3 -o output -p spleeter:2stems-16kHz

[romi1502]

We’ve just updated the FAQ for making clearer how you can actually perform separation above 11kHz. Notably we pushed alternate configuration files (spleeter:2stems-16kHz, spleeter:4stems-16kHz and spleeter:5stems-16kHz) that perform separation up to 16kHz and explained how you can set upper separation frequency in the config file if you need another value.