Re: [Mixxx-devel] Serato CD Vinyl control on Mixxx trunk

2011-04-28 Thread Owen Williams
On Thu, 2011-04-28 at 00:44 -0400, John Brier wrote:


> I got absolute mode to work by switching to Serato CD and setting
> Absolute mode in the preferences, but it was wonky, every once in a
> while the pitch would jump up in the GUI and then go back to where it was.


The control code is designed to nudge the pitch up or down if the
timecode of the track is drifting compared to the timecode coming in
from control code.  This makes sense in vinyl-land, where there are
variations in pressings, but shouldn't happen with CDs.  If the playback
is out of sync with the CDs, it implies that xwax is interpreting the
pitch wrong.  If you've got pitch set at 0, does mixxx show the playback
speed at +/- 0 bpm?

First, I would make sure that needleskip prevention is turned off,
because that's definitely not needed with CDs.  Not sure if that will
help though.

> 
> Also even at latency set to 23 ms after first loading mixxx and loading
> a track in a deck and starting it, it would play at 1/4 speed and then
> catch up after a few seconds. After it caught up and played normally it
> didn't have that problem again.

The quarter speed and stuttering stuff sounds like a sound card problem,
not a control code problem, I think.  When you say it sounds 1/4 speed,
does the pitch drop too or is it just stuttering?  Does the bpm
indicator also drop, or is the problem just in playback?  Do you get
playback problems without using CDJ control?


> 
> btw, xwax 1.8 and 1.9 on the same hardware has almost no lag and
> absolute mode works perfectly.

Unfortunately I don't have an SL-1 or CDJs, so I can't really test your
setup at all (unless you're based at Redhat's Boston office).  I'll try
to help debug this problem, though.

Owen



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Re: [Mixxx-devel] Serato CD Vinyl control on Mixxx trunk

2011-04-28 Thread RJ Ryan
>
>
> Nope, In the Raleigh office. But I will be at our annual Summit
> (conference)
> which is in Boston this year, Next week. We are going to be DJing up
> there with Mixxx and xwax :-)


Sounds like a good excuse to have a Boston Mixxx-UG meetup :)



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Re: [Mixxx-devel] Serato CD Vinyl control on Mixxx trunk

2011-04-28 Thread John Brier
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On 04/28/2011 10:13 AM, Owen Williams wrote:
> On Thu, 2011-04-28 at 00:44 -0400, John Brier wrote:
> The control code is designed to nudge the pitch up or down if the
> timecode of the track is drifting compared to the timecode coming in
> from control code.  This makes sense in vinyl-land, where there are
> variations in pressings, but shouldn't happen with CDs.  If the playback
> is out of sync with the CDs, it implies that xwax is interpreting the
> pitch wrong.  If you've got pitch set at 0, does mixxx show the playback
> speed at +/- 0 bpm?

Yes, in fact the BPM normally doesn't change, even when the pitch does
change
as I move the pitch on the CDJ up and down.

When I say it's wonky I mean the pitch fader in the GUI goes up and
down. I don't remember if the BPM went up and down with it, I'll check
though.

> First, I would make sure that needleskip prevention is turned off,
> because that's definitely not needed with CDs.  Not sure if that will
> help though.

I am pretty sure it was off.

>>
>> Also even at latency set to 23 ms after first loading mixxx and loading
>> a track in a deck and starting it, it would play at 1/4 speed and then
>> catch up after a few seconds. After it caught up and played normally it
>> didn't have that problem again.
> 
> The quarter speed and stuttering stuff sounds like a sound card problem,
> not a control code problem, I think.  When you say it sounds 1/4 speed,
> does the pitch drop too or is it just stuttering?  Does the bpm
> indicator also drop, or is the problem just in playback?  Do you get
> playback problems without using CDJ control?

I don't get stuttering when not using vinyl control.
This is from memory when I tested it a week or two ago on 1.9.0. I
need to check agan.


>> btw, xwax 1.8 and 1.9 on the same hardware has almost no lag and
>> absolute mode works perfectly.
> 
> Unfortunately I don't have an SL-1 or CDJs, so I can't really test your
> setup at all (unless you're based at Redhat's Boston office).  I'll try
> to help debug this problem, though.

Nope, In the Raleigh office. But I will be at our annual Summit
(conference)
which is in Boston this year, Next week. We are going to be DJing up
there with Mixxx and xwax :-)


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Re: [Mixxx-devel] Serato CD Vinyl control on Mixxx trunk

2011-04-28 Thread John Brier
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On 04/28/2011 03:18 AM, Tobias Rafreider wrote:
> Hey John,
> 
> could you tell us your operating system?


Fedora 14

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Re: [Mixxx-devel] Serato CD Vinyl control on Mixxx trunk

2011-04-28 Thread Tobias Rafreider
Hey John,

could you tell us your operating system?

Thanks,

Tobias

Am 28.04.2011 06:44, schrieb John Brier:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> I had gotten Mixxx 1.9.0 with my Serato SL-1 and CDJ 800s working a week
> or two ago but it was quite laggy at 23 ms. If I went any lower it would
> stutter for a while, then play normally, then stutter again.. over and over.
>
> I tried out the trunk tonight after qxi told me there were a lot of
> changes to the code.. latest xwax etc.
>
> Cool things, the signal quality meters in preferences work now so I can
> see the circles spinning and the radar like bar go around the circle
> like a clock. That didn't work in 1.9.0 at all.
>
> For a time I was getting 5 ms latency with no problems, but then I
> started playing a second deck, loading a track and it all started
> playing at 1/4 speed and stuttering.
>
> I got absolute mode to work by switching to Serato CD and setting
> Absolute mode in the preferences, but it was wonky, every once in a
> while the pitch would jump up in the GUI and then go back to where it was.
>
> Also even at latency set to 23 ms after first loading mixxx and loading
> a track in a deck and starting it, it would play at 1/4 speed and then
> catch up after a few seconds. After it caught up and played normally it
> didn't have that problem again.
>
> btw, xwax 1.8 and 1.9 on the same hardware has almost no lag and
> absolute mode works perfectly.
>
> Intel Core 2 Duo
> 2.5 GB DDR2
>
> - -- 
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