MATLAB: How to splice together videos, of different frame rates

combining videosvariable frame rates

Hi,

Has anyone tried to splice together two or more videos, into a single video, using MATLAB? For example: video1 is composed of frames f1, f2, f3, f4 at frame rate 10 frames per second; video2 is composed of frames f4, f5, f6, f7 at frame rate 15 frames per second. I would like to splice video1 and video2 into a single video, which I will call, video3. video3 will thus be composed of frames f1, f2, f3, f4, f5, f6, f7 with frame rate 10fps on frames [f1,f2,f3,f4] and frame rate 15 fps on frames [f4,f5,f6,f7]. Please help? Thanks.

Best Answer

Replicate each of the first frames 15 times, and replicate each of the other frames 10 times, and declare that the frame rate is 150.

Related Solutions

MATLAB: Do I get an error when I specify certain range of frames in the function READ while reading WMV video files in MATLAB 7.14 (R2012a)

This is a bug in MATLAB 7.14(R2012a) wherein the READ function does not read the WMV video files for certain ranges of frames.

As a workaround you can do the following,

1) Always start reading the WMV file from frame 1

2) Convert the WMV file to another format using a third party tool.

MATLAB: I am making a video at 240 FPS for 1 min but whenever I trim that video for 5 seconds that 5 second of video have 30 FPS. wondering why frame rate reduces

The key to the solution of your problem is the “FrameRate” property of the “VideoWriter” object. If unspecified, the “FrameRate” property defaults to a value of 30 FPS. Hence the video output in your case is at 30 FPS. To change the output frame rate to 240 FPS, you need to explicitly set the “FrameRate” property to 240 FPS. The following code snippet can help you to solve your problem.

% Read the input video file
reader = VideoReader("inputVideo.avi"); % Assuming the name of Input video file is "inputVideo.avi".
% Create a VideoWriter object for the output file
writer = VideoWriter('outputVideo.avi'); % Assuming the name of Input video file is "outputVideo.avi".
% If the value of frame rate is unspecified, the FrameRate property is by default set to 30 FPS
% To Set the desired frame rate, explicitly specify the FrameRate property of the VideoWriter object.
writer.FrameRate = 240; % 240 FPS
% Open the file for writing
open(writer);
while hasFrame(reader)      % while frames are remaining
   img = readFrame(reader); % read a frame
   writeVideo(writer,img);  % write a frame to the output file
end
% close the files
close(writer); 
close(reader);

Best Answer

Related Solutions

MATLAB: Do I get an error when I specify certain range of frames in the function READ while reading WMV video files in MATLAB 7.14 (R2012a)

MATLAB: I am making a video at 240 FPS for 1 min but whenever I trim that video for 5 seconds that 5 second of video have 30 FPS. wondering why frame rate reduces

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