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have a buffer which has the Mats from which i want to create a video

I transform those mats into byte array and write them to the outputstream yet for some reason whenever I watch the video only one image is shown heres the code

try {
File sdCard = Environment.getExternalStorageDirectory();
File dir = new File (sdCard.getAbsolutePath() + "/ran");
dir.mkdirs();
File file = new File(dir, "goal_ran.mp4");
FileOutputStream out = new FileOutputStream(file);

for(int i=0;i<buffer.size();i++)
{

    Mat mat = buffer.get(i);
    MatOfByte matOfByte = new MatOfByte();
    Imgcodecs.imencode(".png", mat, matOfByte);
    byte[] byteArray = matOfByte.toArray();
    out.write(byteArray);
    out.flush();
    /*byte[] return_buff = new byte[(int) (buffer.get(i).total() * buffer.get(i).elemSize())];
    buffer.get(i).get(0, 0, return_buff);*/
    /*int length = (int) (mat.total() * mat.elemSize());
    byte buffer[] = new byte[length];
    mat.get(0, 0, buffer);
    out.write(buffer);*/
}

out.close();
Log.d("Video","Successful"+ buffer.size());



} catch (Exception e) {
    e.printStackTrace();
}