Why is VideoReader telling me the duration of every video is 0?

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Bradley 2025-10-23

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https://ww2.mathworks.cn/matlabcentral/answers/2180828-why-is-videoreader-telling-me-the-duration-of-every-video-is-0

评论： Harald 2025-10-24

I am trying to use VideoReader to gather data about a video. Ultimatly what I want to do is define a time stamp and extract the frame that corresponds to that time frame. For some reason when I use VideoReader I get all of the usual data except for the Duration which always reads 0. Ive tried a few videos and they all read 0. Below is my code.

Edit: The video im trying to load is roughly an hour long

VideoName = "video.mp4";
V = VideoReader(VideoName);
VideoHeight = V.Height;
VideoWidth = V.Width;
VideoFrames = V.NumFrames;
VideoFrameRate = V.FrameRate;
VideoLength = VideoFrames/VideoFrameRate;
TargetTimeStamp = 0;
V.CurrentTime = TargetTimeStamp;
Frame = readFrame(V);
imshow(Frame)

Here is the output of VideoReader:

Duration	0	1×1	double
Name	'video.mp4'	1×38	char
Path	'C:\Users\'	1×46	char
BitsPerPixel	24	1×1	double
FrameRate	31.4136	1×1	double
Height	1080	1×1	double
NumFrames	2328	1×1	double
VideoFormat	'RGB24'	1×5	char
Width	1920	1×1	double
Tag	''	0×0	char
UserData	[ ]	0×0	double
CurrentTime	0.0318	1×1	double

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Bradley 2025-10-24

I moved all of my code over to a linux machine and got everything working. I was on windows and the video format was an MP4 file. it is infact 66 minutes long not a minute, I dont understand why this wasnt working on my windows machine, maybe it was an encoder issue im not sure. Thanks for the input everyone I was able to get everything working!

Harald 2025-10-24

That's interesting, and I am happy for you! :)

As I wrote, it was working fine with me, and I am working on Windows. So, if you are still interested in making it work on Windows as well, please try what I suggested as an initial investigation.

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