How do I do what aviread used to do using videoreader?

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Chuck37 2018-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/431024-how-do-i-do-what-aviread-used-to-do-using-videoreader

回答： Image Analyst 2018-11-20

I upgraded Matlab and things that used to be easy are now much more complicated. I could rewrite movie2avi pretty quickly, but videoreader is a worse when trying to created the functionality of aviread. I can get the frames, but colormap is missing. Why did they think we would want to replace one line with a dozen, including a for loop?

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Jan 2018-11-20

The forum cannot answer your question about the intention of the MathWorks staff. So do you have a question the forum can answer or is this just a statement about your level of frustration?

Which problem do you try to solve?

Chuck37 2018-11-20

The title of my question is the question. The venting of frustration is incidental.

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Answer 1

Walter Roberson 2018-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/431024-how-do-i-do-what-aviread-used-to-do-using-videoreader#answer_348050

videoreader readframe with 'native' option returns the usual cdata and colormap information . without the native option ind2rgb equivalent is automatically done returning the rgb version of the data .

The change was for efficiency . With aviread it always scanned the full file at the time it opened it and the buffer flow was not as good so it was slower and took more memory . The newer function is better for streaming type situations especially with larger videos that might not even fit in memory .