Announcing the new Datavyu v1.3.6 with enhanced features and transcription support!

Our research team is coding our data in 15-second intervals and we have a script to generate columns in 15-second intervals. However, we've noticed that the way Datavyu plays these intervals differs from one computer to another. When we 'snap' the interval, Datavyu on one of our computers ends each interval a second or two sooner than Datavyu on another computer. And Datavyu on one computer consistently starts playing only about 3-5 seconds after the interval start time (the video is just frozen for the first couple of seconds). Even if it is only off by a few seconds, it makes a difference because we're coding in such short intervals. Is there any way to fix this so that it is the same across different computers? Or does it depend on how new or upgraded the computer is?

asked 21 Aug '15, 12:48

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NR90
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I completely understand how important a few seconds are when coding for behavior. We don't want your coders to code different things.

To help understand what is happening and to try to recreate the issue, I need a bit more information. Can you please let me know:

What type of computers are you using? What version of Datavyu are your computers using? What video plugin are you using? Do your videos play smoothly in that video plugin when playing them in the program outside of Datavyu?

Thank you, Vicky

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answered 21 Aug '15, 13:26

Vicky%20Foo's gravatar image

Vicky Foo ♦♦
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accept rate: 1%

The computers are Dell Optiplex 755 and 780. The version of Datavyu we're using is the same on all computers- it's the stable release version. We use VLC as our video plugin, and it's the same version of VLC. The videos do play smoothly on VLC when playing them outside of Datavyu. Let me know if there's any other information I can provide.

Thanks!

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answered 28 Aug '15, 11:19

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NR90
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It sounds like the issues that you are experiencing are from two problems:

Unfortunately, VLC does not consistently have frame accurate codes. This is something we have experienced before and that is why we suggest in our user guide to use Quicktime. http://datavyu.org/user-guide/guide/install.html

The slow video playback may be due to the power of your computers. I would look at the CPU to see if there is a large difference. We recommend a minimal CPU for smooth video playback on our download page. http://datavyu.org/download.html

We are currently looking into trying to make VLC work better with frame accurate coding as well as making it more clear in our documentation that this is a big drawback to using VLC.

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answered 15 Sep '15, 18:41

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Vicky Foo ♦♦
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accept rate: 1%

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question asked: 21 Aug '15, 12:48

question was seen: 2,495 times

last updated: 15 Sep '15, 18:41

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