Videoreader jitter

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Alexander Farley 2012-1-4

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Hi,

I'm loading a video using VideoReader and processing frame by frame. Occasionally, it looks like VideoReader repeatedly provides the same frame regardless of index. Eventually, the reader "catches up" and gives the correct frame.

The result is that the processed video looks jittery and choppy. The jittery loading seems to occur unpredictably.

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回答（3 个）

Walter Roberson 2012-1-4

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VideoRecorder is not designed for "real-time" or precision timing. Please consider using the Image Acquisition Toolbox

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Walter Roberson 2012-1-4

Sorry, somehow earlier I read your question as having to do with VideoRecorder instead of VideoReader. VideoReader should be able to read every frame.

Which MATLAB version are you using?

Alexander Farley 2012-1-6

I'm using r2011a. The videos are in .wmv and .asf format. The VideoReader class basically works except for the problem mentioned above.

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Image Analyst 2012-1-6

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You're talking about extracting a single frame and displaying it in an axes, right? Not playing it as a movie and noticing some pauses or hangups? Are you sure the frame(s) in question are not in there two or three of multiple times in a row (like frames 14-18 are all the same)? Do you have some alternate way of viewing a frame at a time - like some other program?

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Image Analyst 2012-4-17

Can you upload one of the original input choppy videos and tell me what frame it pauses?

K E 2012-9-26

I am having problems with VideoReader appearing to read in a different number of frames each times a video file is read. I would love to know more about this problem if you figure it out.

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