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

We are having a few issues with Datavyu,

  1. We've experienced some glitches in the program, for example, it often freezes up and stops running in the middle of coding forcing us to close the program and lose any unsaved data. Is there anything in particular that has perhaps been brought to your attention that may be contributing to this? (Ex: large data files, needs new update etc.) And if so, do you have any suggestions as to how to avoid this in the future?

  2. This one is a little more difficult to describe. When we started using Datavyu we used the same jog speed as we were using in openSHAPA (300). This is the best speed for us to move frame by frame. The difficulty we are having however is that when we are not only moving frame by frame (clicking the jog button once at a time) but using it to forward through the video with control (holding the jog button down) it forwards significantly more slowly than when we did this in OpenShapa. Is there something we can do to change this? Or would be have to change the actual jog speed (thus changing the frame by frame increments)?

asked 09 Dec '13, 13:17

Lakusta%20Lab's gravatar image

Lakusta Lab
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Every file uploaded to Google Drive has its own link (accessible via the share panel, it should be at the top). Also remember to change the file's settings to "anyone with link can see" in the share panel! You can send the link to me at gladys.chan at nyu dot edu. Thanks!

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answered 24 Jan '14, 15:02

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GladysChan ♦♦
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First off, what version of Datavyu are you using? If you don't have the most recent release, it might be contributing to both issues you're describing.

Glitches in the program like what you're describing could be from a number of things. Some are known bugs we're working on, but things about your set-up can make them worse. Having an out of date version of the software, a computer with less processing power, or a video that's very high resolution (especially if you aren't using a high-powered computer) can all be issues. What are the specs on your computer? And what resolution and codec is your video (1080p? 720? Something smaller?) If you're not sure how to check the codec, we can walk you through it.

The slow jogging is something we encountered as well in the past, and may be related. Definitely let us know what version you're using, because some of the recent releases did a lot to fix this. If it's not that, it could be that the video is too much for the computer to jog through quickly. We've found that for some high definition videos we have to use specific codecs so the computer can keep up. If it's something like that, we can advise you what might work better. Changing the jog increment won't help; the computer still has to quickly jump from frame to frame.

Get back to us with what version of Datavyu you're using, what kind of computer you're using, and what your videos are like, and we'll let you know what the likely culprit is.

And a follow-up: when you say the jog speed you use is 300, what do you mean? Did you mean 30 frames a second? Or that it jogs by 300 ms at a time?

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answered 11 Dec '13, 23:04

WhitneyCole's gravatar image

WhitneyCole ♦
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edited 11 Dec '13, 23:09

Hello, Thank you for your response. Below I have done my best to answer your questions,

1- We are using Datavyu version 1.0.5

2- I:m not quite sure how to check our codec. The computer we are using a iMac, OS X, 10.6.8, with a processor of 2.66 GHz and 4GB memory

3- We are using videos that have been exported in HD, could that also play a part into our related to jogging?

4- When we used the jog function in openSHAPA the milliseconds would increase by 34 -- we would like to have this same rate in datavyu.

Please let us know if you need any more information. Thank you and happy holidays!

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answered 23 Dec '13, 15:13

Lakusta%20Lab's gravatar image

Lakusta Lab
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Hello again,

I am just reposting our answer to your response from December 11th 2013. Please let us know what other steps to take forward. Thank you.

1- We are using Datavyu version 1.0.5

2- I:m not quite sure how to check our codec. The computer we are using a iMac, OS X, 10.6.8, with a processor of 2.66 GHz and 4GB memory

3- We are using videos that have been exported in HD, could that also play a part into our related to jogging?

4- When we used the jog function in openSHAPA the milliseconds would increase by 34 -- we would like to have this same rate in datavyu.

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answered 05 Jan '14, 16:18

Lakusta%20Lab's gravatar image

Lakusta Lab
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The current version of Datavyu is 1.0.4rev3; I'm not sure how you got 1.0.5. I'd strongly recommend downloading version 1.0.4rev3 from the website and trying that.

You can check your codec by opening the movie in Quicktime and going to "Window" at the top and opening the Movie Inspector. That should give the codec (it might be listed as the format, rather than saying codec specifically).

If your videos are HD, that could definitely be a factor (especially depending on what type of codec you're using). Datavyu can do HD videos, but jogging an HD video requires the computer to do a LOT of work. Depending on what codec you're using currently, we may be able to suggest a codec that is a bit more efficient - it would be easier on the computer without sacrificing the quality you want. If your video is 1080p, you might also want to consider downsizing to 720p if that doesn't pose an issue for coding. The slight downsize has, in our experience, helped speed up rapid jogging and shuttling.

Try using version 1.0.4rev3, and see if that solves the problem. And let us know what codec you're using and we can advise.

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answered 11 Jan '14, 11:28

WhitneyCole's gravatar image

WhitneyCole ♦
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accept rate: 21%

We downloaded Datavyu 1.0.4rev3. However, we are still having some issues with the jog. The codec(format) that we are using is: H.264, 960 x 540, Millions Linear PCM, 16 bit little-endian signed integer, 2 channels 44100 Hz.

Right now we have a 960p video. Would it be worth it to downsize to 720p?

In addition, we just recently switched over to coding with HD movies. Thus, we have used Datavyu without HD movies and the same slow jog issue remained.

Please let us know what we should do!

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answered 16 Jan '14, 15:23

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Lakusta Lab
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Downsizing to 720p might speed things up, but if the same slow jog issue has always existed even without HD, then I am not sure how much better it would be. A factor might be in the codec. H.264 is a highly compressed format, meaning that in recreating each frame, the computer expends more power than it would have in a less compressed format. Different versions of the operating system also plays a part. Memory allocation in Java in OSX 10.6.8 is significantly different than in more recent versions. Our lab is currently on 10.8.

Since there are multiple potential factors at hand, the best thing to do would be to test out each one. Do you think you can send one of your videos you're having problems with, so we can test out exactly what the issue is? We can send you instructions on how to upload onto our lab server, or we can easily download from Google Drive/ Dropbox. Thanks!

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answered 21 Jan '14, 14:10

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GladysChan ♦♦
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Thank you for your help! We have tried downsizing to 720p and that didnt make much of a difference, so I would like to send you a video. How would I share this with you on Google Drive?

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answered 22 Jan '14, 16:20

Lakusta%20Lab's gravatar image

Lakusta Lab
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Thank you Gladys, a link has been shared with you via email!

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answered 30 Jan '14, 18:24

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Lakusta Lab
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Thanks, we got your video and are still in the midst of testing it on different settings/ systems.

I do have an answer for this question: "4- When we used the jog function in openSHAPA the milliseconds would increase by 34 -- we would like to have this same rate in datavyu." In Openshapa, the Gstreamer automatically configures the framerate. In Datavyu, you have to manually enter a framerate. In your case, this should be 29.97 - this is standard amongst most 30fps videos nowadays. If you enter 29.97, your video should jog by 34 instead of 33.

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answered 04 Feb '14, 13:26

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question asked: 09 Dec '13, 13:17

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last updated: 12 Feb '14, 11:47

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