ProRes video causes slow responsiveness and audio doesn't work

[Elliott Balsley]

I thought I just posted this, but it's not showing up so I'm posting again:

I just downloaded the demo of QLab 3 and am having problems playing ProRes videos.  It takes 15-30 seconds to trigger one of these cues, and the audio plays back as loud static 95% of the time.  The waveform also shows the loud static.  The other 5% it sounds fine and the waveform looks fine.  Here's an example:

Also, when I have one of these videos in the cue list, it's very slow to move the selection up and down in the list.  This problem is happening with ProRes 422, HQ, and LT.  Other codecs (H.264) work fine.  I should mention that the audio track in these ProRes files in uncompressed 16 bit.

System details:
QLab 3.0.11
OS X 10.9 Mavericks
Mac Pro octocore 2.4GHz Xeon

32GB memory

GTX 570

500MBps software RAID

[Dave H.]

Elliott, if you look a few threads down on this group, you'll see one for QLab 3.0.12b6.  Try it again with the linked file from there…it's supposed to fix a few issues with Mavericks, and 3.0.11 is known to not be 100% compatible with it.

[Elliott Balsley]

That seems to fix it.

But I have one particular video that has 8 audio tracks, and only one of them is playing in QLab.  Is this a limitation of the demo, or a missing feature, or a bug?

Note:  This is not a multi-channel audio track, but 7 mono tracks and one stereo track in the file.

[Andy Lang]

On Thu, Oct 24, 2013 at 5:56 PM, Elliott Balsley <elliott...@gmail.com> wrote:

But I have one particular video that has 8 audio tracks, and only one of them is playing in QLab.  Is this a limitation of the demo, or a missing feature, or a bug?

Note:  This is not a multi-channel audio track, but 7 mono tracks and one stereo track in the file.

Some of what you wrote here needs clarification, because there's some confusion with terminology going on here. Are you using the free version of QLab? (We don't have a "demo" version, per se.) If so, as noted at http://figure53.com/qlab/buy/ in the big feature comparison chart, the free version only supports two channels of audio in, two out, and thus two per file. So if you don't have a paid license, that's what you'll get.

Further, in that graphic, you're routing to the built-in stereo output, which is, well, a stereo output, so you'll only ever see two channels going across horizontally, since that's all you have on that device. With a paid license, if you had a multi-channel audio file, you'd see 8-24 channels going down the left side, depending on the file.

You're also saying that you have a video file that's 8 tracks, but then later say it's 7 mono tracks and one stereo. You may have mixed as the latter in your editing software, but as far as the file goes, there's no difference. You've got a 9 track file. In that case, you'll need a Pro license to enable all 9 channels.

Let us know if we can clear anything else up!

Best,

Andy Lang

QLab Support

[Elliott Balsley]

OK sorry about that, yes I meant I’m using the free version for now.

Technically there is a difference between channels and tracks.  It’s accurate to say this file has 7 mono tracks and 1 stereo track, for a total of 8 tracks.  But if I understand you right, QLab Pro will ignore this and simply see 9 channels.

Anyhow, thanks for the explanation, this will work.  I’m just testing this out before recommending my company buy the pro version.

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[Aksel Gundersen]

A stereo signal is 2 tracks, so QLab is doing it right.