Video Steganography, audio steganography.

Hi everyone! I hided data in audio and put it back in video(without audio), then I extracted the audio to retrieve data but i can't get any data. Please help me!

This is my code to extract audio

[input_file, Fs] = audioread('video.avi');
audiowrite('.\audio\audio.wav', input_file, Fs);

This is my code to create video without audio.

% create video without audio
    vidObj = VideoReader(vidfile);
    videoOut = VideoWriter('ouput1','Uncompressed AVI');
    videoOut.FrameRate = vidObj.FrameRate;
    open(videoOut);
    
    while hasFrame(vidObj)
        vidFrame = readFrame(vidObj);
        writeVideo(videoOut,vidFrame);
    end
     
    close(videoOut);

And this is my code to merge audio and video(without audio) into stego video.

        %add audio into stego video
        video_filename = 'ouput1.avi';
        audio_filename = '.\audio\stego_audio.wav';
        out_filename = '.\stego_video\stego_audio.avi';

        videoFReader = VideoReader(video_filename);
        FR = videoFReader.FrameRate;
        [AUDIO,Fs] = audioread(audio_filename);
        SamplesPerFrame = floor(Fs/FR);
        videoFWriter = vision.VideoFileWriter(out_filename, 'AudioInputPort', true, 'FrameRate', FR);
        framenum = 0;
        % read every frame and add audio that(every frame)
        while hasFrame(videoFReader)
           videoFrame = readFrame(videoFReader);
           this_audio = AUDIO(framenum*SamplesPerFrame + 1 : min(end, (framenum+1)*SamplesPerFrame), :);
           if size(this_audio,1) < SamplesPerFrame
               this_audio(SamplesPerFrame,:) = 0; %zero pad short frames
           end
           step(videoFWriter,videoFrame, this_audio);
           framenum = framenum + 1;
        end
        delete(videoFReader);
        release(videoFWriter);