VideoReader: Unrecognized function or variable 'hasFrame'

44 次查看（过去 30 天）

显示更早的评论

Alexander Brandt 2024-7-23，18:10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2139686-videoreader-unrecognized-function-or-variable-hasframe

移动：Walter Roberson 2024-7-23，23:01

采纳的回答： Avni Agrawal

在 MATLAB Online 中打开

I am following the VideoReader documentation from https://www.mathworks.com/help/matlab/ref/videoreader.html

When I try to run the example code using R2024a Update 5,

currAxes = axes;
v = VideoReader("xylophone_video.mp4");
while hasFrame(v)
    vidFrame = readFrame(v);
    image(vidFrame,"Parent",currAxes)
    currAxes.Visible = "off";
    pause(1/v.FrameRate)
end

the line with while hasFrame(v) throws an error: Unrecognized function or variable 'hasFrame'.

The VideoReader object was created, but the hasFrame(v) line does not work. Was support for this function removed? If so, what replaced it?

5 个评论
显示 3更早的评论隐藏 3更早的评论

Alexander Brandt 2024-7-23，19:14

@Walter Roberson It gives me:

Methods for class VideoWriter:

VideoWriter delete open set

close get saveobj writeVideo

Static methods:

getProfiles

Methods of VideoWriter inherited from handle

It doesn't list hasFrame as one of the methods for the class.

Avni Agrawal 2024-7-23，19:22

MATLAB Version: 24.1.0.2537033 (R2024a)

Operating System: Microsoft Windows 11 Enterprise Version 10.0 (Build 22631)

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Avni Agrawal 2024-7-23，19:41

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2139686-videoreader-unrecognized-function-or-variable-hasframe#answer_1489626

移动：Walter Roberson 2024-7-23，23:01

You are trying to access VideoWriter instead of VideoReader. Are you sure the code you are trying to run has VideoReader() but not VideoWriter() ?

Because, methods(v) is returning:

Methods for class VideoReader:

VideoReader hasFrame read saveobj

get inspect readFrame set

Static methods:

getFileFormats

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Alexander Brandt 2024-7-23，20:17

移动：Walter Roberson 2024-7-23，23:01

@Avni Agrawal That resolved it, thank you!

请先登录，再进行评论。

类别

MATLAB Data Import and Analysis Data Import and Export Standard File Formats Audio and Video Data

在 Help Center 和 File Exchange 中查找有关 Audio and Video Data 的更多信息

产品

MATLAB

版本

R2024a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by