Hello,
I'm trying to extract random parts from many (random) videos for a stage act. I thought it might be easier to do this on Matlab, but I am stuck on code:
Main parts/procedure I wanted to have
1. Pick a random video from directory
2. Choose a random video duration between 1 to 10 seconds.
3. Choose a random video crop starting point within selected video
4. Crop the video staring from crop point (3) with duration (2) (duration is in video frames count)
5. Export
I wrote below code, but I couldnt start the export from the random crop point, It exports from start with randomly selected duration.
Asa summary in the code below, Cstart is the random start point within video and Cend is the end point. Code crops the duration between Cstart and Cend correct, but from the beginning not random mid point.
Thanks in advance.
All
cd('C:\Users\Alper\Desktop\BamBamBam\vids\');
tmp = dir('*.mp4');
VideoList = {tmp.name}';
MXS = 10
k = numel(VideoList)
for j = 1:1000
filename=strcat(num2str(j),'.mp4')
VR = randi([1 k],1,1)
VT = VideoReader(VideoList{VR})
DR = VT.Duration
FR = VT.FrameRate
DRL = randi([1 round((DR-MXS)*999)],1,1)/1000
FRL = randi([1 MXS],1,1)
Cstart = FR*round(DRL)
Cend = Cstart + FR*round(FRL)
videoFReader = vision.VideoFileReader(VideoList{VR});
videoFWriter = vision.VideoFileWriter(filename,'FileFormat','MPEG4','FrameRate',...
videoFReader.info.VideoFrameRate);
y = vision.VideoFileWriter
y.VideoCompressor='MJPEG Compressor'
for i=Cstart:Cend
videoFrame = step(videoFReader);
step(videoFWriter,videoFrame);
end
release(videoFReader);
release(videoFWriter);
end
