Hey,
The problem with your code seems to be that you’re not setting the frames per second parameter. If you don’t set it, the model assumes the FPS to be 30(default). Now when you add audio using the step command, its rushed/played quickly, to finish within the time frame of numFrames/FPS.
Here’s my solution. Hope this helps.
[data, freq] = audioread('pathtoAudioFile');
img = imread('pathtoImage');
audioLength = length(data)/freq;%duration of audio file
writerObj = vision.VideoFileWriter('newvideo.avi', 'AudioInputPort',true, 'FrameRate', 1);%Setting FPS to 1. Now we need to add atleast
%audioLength number of frames
for i = 1:audioLength
parsedAudio = data((i-1)*length(data)/audioLength + 1:i*length(data)/audioLength);%parsing the audio into equally sized pieces(play for 1 sec)
% that can be added with each img frame
step(writerObj, img, parsedAudio);
end
release(writerObj);
