Add stem file created with NI stem creator (mp4box)

[axeldelafosse]

Compatible with Traktor:

[faroit]

Great, thanks!

• Lets try replacing the existing m4a and see if stempeg unit tests still run.
• Conerning ALAC, is it supported on traktor?

[axeldelafosse]

Yes, ALAC is supported. I used a slightly modified version of https://github.com/axeldelafosse/stemgen to generate the files. The file is bigger but it's lossless. I actually don't mind having bigger files. I guess it should be an option, we need to keep this in mind.

[faroit]

Okay, I will add ALAC support to the unit tests later. For now, lets try to keep the repo-size down and just go with m4a, please

[axeldelafosse]

OK. Just to be sure, you want me to replace the current stem.mp4 file with the new stem.m4a aac file?

[faroit]

Yep. If you want to keep m4a instead of mp4, thats also fine. In that case change the unit test paths

[axeldelafosse]

Cool. Done!

[faroit]

weird, this new file doesn't seem to be able to be able to get demuxed with quicklook on OSX (See #22). Maybe we need a combination the current and the new method to cover more broad playback support (quicktime, vlc, ffmpeg and traktor)

[faroit]

Your file is significantly larger than the old one. Does the stem creator use different bitrate settings? (I used 256kbit CBR AAC)

[axeldelafosse]

weird, this new file doesn't seem to be able to be able to get demuxed with quicklook on OSX (See #22). Maybe we need a combination the current and the new method to cover more broad playback support (quicktime, vlc, ffmpeg and traktor)

Yeah this feature can be useful! Didn't knew about it.

Your file is significantly larger than the old one. Does the stem creator use different bitrate settings? (I used 256kbit CBR AAC)

No it's 256kbit too: https://github.com/axeldelafosse/stemgen/blob/master/ni-stem/_internal.py#L110

Digging in, I realized that the stem creator convert each stem to .m4a using afconvert before creating the file with mp4box.

I double checked and it's weird but the file is 238kbit:

Your old file is 129kbit:

Any idea why?

[faroit]

coming back to this, i noticed that your file does not allow to switch substreams on the OSX default player (See #22). So, it looks like there are good reasons for stems created using mp4box (NI/Traktor compatibility) or ffmpeg (general better compatibility). Therefore, I want to allow mp4box optionally and not replace the ffmpeg way of exporting

@axeldelafosse can you rename your exported files so we have

• data/The Easton Ellises - Falcon 69.mp4box.stem.m4a

in addition to

• data/The Easton Ellises - Falcon 69.ffmpeg.stem.m4a

Also

• can you add the MUSDB18 colors to the stems if possible?

[faroit]

@axeldelafosse would you mind looking into this again? thanks so much!

[axeldelafosse]

Yeah sure -- sorry for the delay. Can you share the MUSDB18 colors here please?

[faroit]

Yeah sure -- sorry for the delay. Can you share the MUSDB18 colors here please?

dito ;-)

the musdb18 colors are:

vocals #56B4E9
drums #009E73
bass #D55E00
other #CC79A7

[axeldelafosse]

Here we go

[faroit]

the file is included in #28 . closing this out now