How to log acquired data to disk, and save the video file as mp4 or .avi ?

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Koohyar 2020-9-7

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评论： Koohyar 2020-9-9

Hi,

I am trying to log acquired data to disk, and save the video file as mp4 or .avi, but it doesn't create any file in the folder? Any advice would be appreciated.

thanks.

clear ;
 close all;
 vid = videoinput('winvideo', 1, 'YUY2_640x480');
 
 vid.Timeout = 20;
 set(vid, 'FrameGrabInterval', 2);
vid.LoggingMode = 'disk';
logfile = VideoWriter('MATLAB.mp4', 'MPEG-4')
vid.FramesPerTrigger = 20;
start( vid );
wait( vid, Inf );
[d t] = getdata( vid, vid.FramesAvailable );
fps =  1 / mean( diff( t ) );
 vid.ReturnedColorSpace = 'grayscale'
 preview(vid);
 start(vid);
 pause(2);
 frames = getdata(vid);
 
 stop(vid)
 clear vid

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回答（1 个）

Sulaymon Eshkabilov 2020-9-7

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Hi,

Probably, you'd need to indicate the directory of your log data as a whole, e.g.: '../dir/videos/MATLAB.mp4'

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Koohyar 2020-9-8

在 MATLAB Online 中打开

I can log to disk according to another script, but not as 'graysclae', whcih I am looking for! I dont know how can I return the colorspace to graysclae?

vidobj = videoinput('winvideo', 1, 'YUY2_640x480');
vidobj.LoggingMode = 'disk'
vidobj.DiskLogger = VideoWriter('logfile.mp4', 'MPEG-4')
vidobj.ReturnedColorSpace = 'grayscale'
vidobj.FramesPerTrigger = 30;
start(vidobj)
wait(vidobj)
while (vidobj.FramesAcquired ~= vidobj.DiskLoggerFrameCount) 
    pause(.1)
end
vidobj.FramesAcquired
vidobj.DiskLoggerFrameCoun
delete(vidobj)
clear vidobj