how to convert video in to image frames using matlab?
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how to convert video in to image frames using matlab?
5 commentaires
Walter Roberson
le 11 Avr 2019
H.264 is generally adaptive to determine GOP structure.
That said, there is also choice in the matter. For some purposes, the exact structure can be important and GOP that follow a fixed pattern can be generated. There are tradeoffs to be made for bitrate considerations (how fast does your media read information?); or for CPU speed considerations (slower CPUs are less expensive and might produce less heat, but require less complicated video streams); or for how quickly you can seek to arbitrary points (e.g. chapter search or user fast forward or (more difficult) reverse)
Réponses (3)
Lalit Patil
le 7 Jan 2013
vid=mmreader('video.avi');
numFrames = vid.NumberOfFrames;
n=numFrames;
for i = 1:2:n
frames = read(vid,i);
imwrite(frames,['Image' int2str(i), '.jpg']);
im(i)=image(frames);
end
14 commentaires
Walter Roberson
le 27 Jan 2020
mmreader was removed sometime around 2011. You can use VideoReader to replace it in most cases.
Image Analyst
le 17 Mar 2016
Namith:
You can use the VideoReader class to set the starting time of the video, then use read() to extract a frame from the video at exactly that time. Then use imwrite() to save it to disk. Attached is a demo that does something similar (but not exactly what you want). The demo writes out every single frame to files. You just need to set the time with the method for doing that before you extract the frame.
7 commentaires
Randall Ang
le 10 Mai 2021
Hi, I tried using the demo that you provided, and it worked well. However, is there a way to ensure that the aspect ratio of the images remain the same as the video?
Image Analyst
le 10 Mai 2021
If you say
axis('image');
after you display an image, it will show it pixel-for-pixel and the aspect ratio will be the same.
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