load to time not behaving properly

[rmurphy]

Hello all-

I have a group cue containing a number of cues and groups of cues. After a prewait, a music cue starts. At 4:00 into the music cue the orchestra hits a big note, and I want to pop up three video images then. To fine tune the wait time for the images, I of course use load-to-time rather than repeatedly playing through the entire sequence until I get it right. But when I play the group through after adjusting, the video pops up too early by a couple of seconds. Real-time playback and load-to-time aren't consistent.

QLab 3.2.4, MacBook Pro (Retina, 15-inch, Late 2013) NVIDIA GeForce GT 750M 2048 MB Intel Iris Pro 1536 MB, OS 10.12.2, Triple Head 2 Go

Thank you in advance for any help.

Ron Murphy

[micpool]

Are all the elements of the sequence preloaded. Are all the group cues used in the mode  'Start all Children simultaneously'?

I have come across similar problems with discrepancies between cue timings set with load to time that play differently when run from the top, but I think that preloading everything and using nested fire all sequences  generally fixes this.

An alternative approach would be to slice the audio at the big note and use a devamp to fire the video.

Mic

[Ronald Murphy]

Thank you for your reply. Yes,  all the group cues used are in the mode  'Start all Children simultaneously'. I do not explicitly preload any cues, but when I select the top group cue and slide the load-to-time slider to some value, I see yellow dots appear along side ALL of the cues in the group. So I'm thinking they ARE preloaded. 

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From: ql...@googlegroups.com <ql...@googlegroups.com> on behalf of micpool <m...@micpool.com>
Sent: Saturday, January 7, 2017 12:16 PM
To: QLab
Subject: [QLab] Re: load to time not behaving properly

 

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[micpool]

That was my point. When you load to time the cues preload. When you play from the top they don't 

Here's an illustration

Here is a cue loaded to time at 54.8 secs  

Here is a screenshot a few seconds after the load to time  cue is started  The elapsed audio and the wait counter are the same (well less than 1/100 of a second out)

Here is the same cue played from the top with no preloading . This time the wait counter is  over ½ sec ahead sec ahead of the audio cue meaning the video will go early

When we play from the top but with the cue preloaded the counters are bang on

[micpool]

Running that workspace in QLab 4 is interesting

With no preload the timing is tighter than QLab3 at least in this case (less than 5/100 discrepancy) but the counter on the group (New QLab 4 feature) has gone batshit crazy. It started by jumping from 1 sec to 3secs and by the time we get to 1 minute it has just lost the plot. 

Also the count up count down arrows seem to be the wrong way round!!

Mic

[Ronald Murphy]

Thank you again! I now have the videos  popping up at the correct point in the music, but I did it by repeatedly playing the group though in real time until I got it right. Didn't use load-to-time. But I'm confused now. Here are the facts:

1. If I do NOT preload the group,  when the group plays, the videos pop up at the correct point in the music.

2. If I DO preload the group, the videos ALSO pop up at the correct point in the music. Preloading or not preloading made no difference in playback

3. If I load-to-time to just before the point where the videos are to pop up, I see that QLab preloads all the cues, but now when I hit play, the videos pop up 1-2 seconds early.

BTW, to preload the group, what I do is insert just ahead of the group a load cue targeting the group. I play the load cue, and I see it takes a couple of seconds for QLab to load the group. Then play the group. Is that the correct way to preload a group cue?

Ron

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From: ql...@googlegroups.com <ql...@googlegroups.com> on behalf of micpool <m...@micpool.com>

Sent: Saturday, January 7, 2017 7:05 PM
To: QLab
Subject: Re: [QLab] Re: load to time not behaving properly

 

To view this discussion on the web visit https://groups.google.com/d/msgid/qlab/58b03306-c6f8-459d-ade5-62cfe28fe16b%40googlegroups.com.

[Chris Ashworth]

Hi Ronald,

FWIW if you think there may be a bug at play here I’d invite you to send a :

1) bundled & zipped workspace with media files and

2) steps to reproduce

And I’d be happy to investigate. Due to the heavy support load we’ve been under since launching v4 those steps are necessary to be able to actually have enough time on our end to take a look at it.

Cheers,

C

To view this discussion on the web visit https://groups.google.com/d/msgid/qlab/SN1PR19MB02223FA7203DF21AC5B5E02A81650%40SN1PR19MB0222.namprd19.prod.outlook.com.

[Mark Valenzuela]

BTW, to preload the group, what I do is insert just ahead of the group a load cue targeting the group. I play the load cue, and I see it takes a couple of seconds for QLab to load the group. Then play the group. Is that the correct way to preload a group cue?

If you're loading up and playing this cue out of the normal sequence of a show, just select the group and hit the "L" key. 

If you're wanting the group to be preloaded ahead of time during the cue sequence, a load cue ahead of the group is one good solution. There is also a check box for every cue in the Basics tab that says "auto-load." If you enable this for your group, it will be auto-loaded when the previous cue is triggered. (Furthermore, there is a box in the workspace preferences that says "Enable auto-load for new cues" - when you're building a new sequence or workspace and check that box, every cue will be created with the "auto-load" already checked. I actually have a template I use that has that box selected, because I always want my cues to auto-load.)

The Load cue is helpful if you want a sequence to be preloaded before it is the next cue on deck. This helps if you are having a bottleneck somewhere in your sequence when, for example, it's trying to preload a complicated sequence, while trying to play another complicated sequence. More often than not having a cue auto-load after the previous one gets triggered is good enough. 

Remember that with that feature, if you are jumping around in the sequence, cues won't auto-load because you won't have triggered the previous cue. But just hit "L" and you're good to go. None of this may help your specific issue with video, especially if there is a bug, but hopefully helpful for knowing more about auto-loading sequences. 

Best,

Mark