sync working in erratic way

[Arthur Phillips]

hi, this is the problem I have had which hasnt found a solution on the forum...
sync issues
Postby thepanic » Tue Mar 29, 2016 12:26 pm

Hi guys, I've been playing about with Mixxx and I absolutely LOVE it! there's just so much stuff it can do, it's really powerful.
One problem I have found that I can't fiXXX (lol) is in running autodj. If I set both tracks to sync about 1 time out of every 3 crossfades what it will do is do a totally awesome crossfade and then as soon as it loads up the other deck it alters the live deck to something it has deemed more appropriate, which is usually much more than double time and sounds awful and totally ruins the crossfade it has just done - e.g. it is playing a track at a native 129bpm and it crossfades to a native track at 109bpm and adjusts it, then it loads a track in the background on deck 1 which is native at 63 bpm and it instantly switches the live deck to something really ridiculous like 252 bpm! sounding really stupid!
does anyone have any idea what this is or any way to set it so that it doesnt do it?
cheers
thepanic
thepanic

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Joined: Tue Mar 29, 2016 12:12 pm
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Re: sync issues
Postby daschuer » Wed Mar 30, 2016 8:14 am

That sounds like a bug.
Please report it at Launchpad: https://bugs.launchpad.net/mixxx/+filebug
Hopefully a contributor will find and fix it.
daschuer
Mixxx Developer

Posts: 567
Joined: Sun Mar 10, 2013 11:26 am
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Re: sync issues
Postby JosepMa » Wed Mar 30, 2016 12:00 pm

It is an unusual situation, but probably it can be improved.
I believe that what happened is that, due to the difference in bpm, it doesn't set the same bpm and instead sets one to the multiple of the other. It seems that it thought that it needed to adapt also the bpm of the playing track. I assume they weren't exactly 129.00 or 63.00 and it didn't saw that they were already multiples.

It probably needs to give priority to the new track to adapt to multiple, before looking for a new one for the playing track.

Possibly, the algorythm should be: if the track cannot have the same bpm, multiply or divide the value of the playing one (without altering the playback value) and try to adjust the new track to this other value. If it already does this, then maybe it is altering the wrong one.

As suggested fill a bug if you haven't done so already.
JosepMa

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Joined: Sat Oct 10, 2015 7:02 pm
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Re: sync issues
Postby pi r squared » Wed Mar 30, 2016 4:29 pm

Is there any chance you could grab a screen recording of this happening (or, worst case, record it on your phone and upload the footage)? I am struggling to recreate this, even with the most extreme examples of BPM I could find - with Master Sync on, the 'live' track is adjusted periodically to fit with the "master" BPM that has been set (which does cause some interesting issues with tracks with a variable BPM throughout them), but I couldn't make the live track suddenly jump up or down in BPM to fit the next track that was loaded.
djAP.co.uk
pi r squared

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Re: sync issues
Postby thepanic » Wed Mar 30, 2016 7:21 pm

him it's even more freaky thank i thought - it just did a great crossfade for me and then boinged up to 520 bpm!!!
http://postimg.org/image/yl0s1llyl/
thepanic

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Re: sync issues
Postby pi r squared » Wed Mar 30, 2016 7:26 pm

Can you confirm your exact steps to reproduce this - eg. do you hold the SYNC button in order to engage master sync? Which order do you do this in? What was the BPM of the first track you loaded? Do you engage master sync before or after you have loaded the first track?

The more details (however daft they may seem) the better and I will try my best to reproduce. If you could give exact or ballpark BPMs for each track and the order they appear in your AutoDJ queue, etc., that would be tremendous.

THanks.
djAP.co.uk
pi r squared

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Joined: Mon Sep 08, 2008 6:46 pm
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Re: sync issues
Postby thepanic » Fri Apr 01, 2016 8:35 pm

ok, so i've engaged sync b4 switching on auto dj, although the tracks in the playlist could quite easily be synced to relatively similar bpm's it still freaks out on me....
eg, this pic, you can see what the original bpms were, before it loaded up deck 2 it was chugging along quite happily at 131.84 bpm and then when it loaded deck 2 this happened...
http://s10.postimg.org/r43bu71uh/Screen ... _19_51.png
263.67 bpm, just out of nowhere!!!
why is it doing it!?
thanks
thepanic
p.s. you can see that one deck has switched to +46.49 % and the other (LIVE!) deck has switched to +88.34 % - even if it's trying to adjust the bpm's relative to each other you would think that +4.6 and +8.8 would probably do the trick in the real world!!!?

[Daniel Schürmann (daschuer)]

I think I have fixed the Bug in Mixxx 2.3 alpha.
Please check it out.

[Daniel Schürmann (daschuer)]

https://github.com/ywwg/mixxx/pull/6

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/8512