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Greetings all,

We're jumping back into video coding again and I've once again run into some issues with choppy video playback.

I can't use the latest version of Datavyu, due to the "Add Data" button functionality error, so I'm using 1.1.4 instead.

We record our videos at 1080p at up to 60 fps. I need to be able to play 3 videos at once in order to view the action from 3 different angles. We can deal with 30fps if it comes down to it, but the higher the frame rate the better.

When I open even one video using the quicktime plugin, the choppiness is such that everything is completely uncodable. I installed the latest version and selected the back-compatibility java option, so it's not that.

I installed VLC 2.0.1 (32 bit, since 64 bit didn't work). Using VLC resolves 90% of the choppiness, but there are still jumps (several frames in length) in the video when I initially press play. In addition, when I pause or stop the video, it will jump forward several frames from where I actually hit stop/pause.

The only hack I have been able to use to get around this is inserting a 1-3 second blank section of video between each trial to account for the jump (the beginning of a trial is often where some of our more important data is).

I know that the various guides and previous threads have said that Quicktime is preferred to VLC for the best quality datavyu experience. However, it seems that the way I'm exporting makes Quicktime unhappy. Does anyone have any recommendations for a specific codec/resolution/frame rate combination that will allow the best possible quality but allow datavyu to function smoothly? I current export with H.264.

Thanks guys!


asked 24 Jun '14, 13:30

CNSAdam's gravatar image

accept rate: 0%

Our lab exports with H.264 mp4 video at 720p and 30fps. We have tested 1080p video at 30fps and didn't experienced choppiness during playback in Datavyu, but we haven't tried playing 3 of them simultaneously. What are the specifications and operating system of the computers you're using?

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answered 16 Jul '14, 17:53

david's gravatar image

david ♦
accept rate: 4%

The issues you listed are also known problems with VLC. Although VLC is better with video playback, it makes coding extremely difficult. The struggle between VLC and Quicktime has led our group to begin working on a new video plugin. This will come installed with datavyu and will hopefully clear up much of this issue. We will announce when it's ready.

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answered 12 Aug '14, 10:56

Vicky%20Foo's gravatar image

Vicky Foo ♦♦
accept rate: 1%

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question asked: 24 Jun '14, 13:30

question was seen: 11,630 times

last updated: 12 Aug '14, 10:56

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