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

Hi everyone,

We have videos that are recorded at full 1080p at 60 fps that are output as an MPEG-4 format. From what I've read on the forums, if I have a computer with enough processing power and a good video card, I should be able to use these video files in openShapa. However, when I open them in the program and attempt to play them, they are extremely choppy. In addition, when I attempt to jog through the videos, the jog moves in increments of one second rather than one frame.

When I down-sample the videos to 30fps and lower res using AnyVideoConverter, the problem disappears. However, it becomes much harder to code the data due to the loss in spatial and temporal resolution.

Has anyone else had similar issues? Is this simply a matter of obtaining the correct plugin? I've heard people talk of Gstreamer on the forums, but for the life of me I can't figure out how to install and implement it.

Any help you guys could provide would be greatly appreciated.

-Adam

asked 30 Sep '13, 12:49

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CNSAdam
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It sounds like you're having two problems (both of which we've encountered). Jogging by 1 second means Quicktime isn't correctly identifying the frame rate. General sluggishness is probably because the video is too much for the computer to handle. Even on a powerful computer, a high resolution and high frame rate video can be a lot, especially if the codec used a fair amount of compression (for example, if you're using H264 it might just be too much).

First off, I suggest you download the latest release of Datavyu from the website (it sounds like you're using a previous version). It's a beta version, so there may be some issues which are described in the release notes. However, this version may solve one or both of your problems. In this version, if Quicktime can't identify the frame rate automatically, it will ask you to manually set it. This should solve the jogging by 1 second problem. The new version also might be smoother with really high quality videos.

If playback is still sluggish, let us know and we can talk about some alternative ways of converting the video that might preserve the quality you need but lighten the load on the computer. We've had to do similar things ourselves, so we might have some ideas for you.

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answered 04 Oct '13, 09:44

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WhitneyCole ♦
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accept rate: 21%

edited 04 Oct '13, 09:47

Whitney,

Many thanks for the quick reply.

I'm actually using openSHAPA version 1.11. Should I be using Datavyu instead?

-Adam

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answered 04 Oct '13, 13:07

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CNSAdam
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Yes, that's the newer version I was referring to. Give it a shot, and if it doesn't solve your playback problems, let us know.

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answered 04 Oct '13, 13:09

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WhitneyCole ♦
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accept rate: 21%

Whitney,

Many thanks for the advice! This definitely did the trick. Using my home desktop I can easily play 3 1080p, 60fps vids simultaneously for coding.

The lab desktops are another matter. While I negotiate upgrading the PCs for this purpose, have you guys had any luck with free video converter programs such as Handbreak or AnyVideoConverter? I used to use the latter, but stopped because it cannot handle 60fps and the temporal resolution is slightly more of a priority for us than the temporal.

Thanks,

-Adam

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answered 07 Oct '13, 19:48

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CNSAdam
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The program we've used in similar situations is iffmpeg - a GUI for ffmpeg. The important thing is to up the number of key frames being used. When the video uses fewer key frames, the file is smaller, but the computer essentially has to look to more frames to get all the information needed to display each frame. When you up the number of key frames, the computer doesn't have to hold on to as many frames to get all the needed information. It's possible you might need to downsize the spatial resolution a bit as well (depending on how powerful your computers are), but definitely try adjusting the number of key frames.

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answered 09 Oct '13, 20:36

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WhitneyCole ♦
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accept rate: 21%

edited 09 Oct '13, 20:38

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question asked: 30 Sep '13, 12:49

question was seen: 13,007 times

last updated: 09 Oct '13, 20:38

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