title: Add an image to mp3, and convert it to a video file using ffmpeg
body: <p>I have the following files:<br>
   1.  a jpeg image<br>
   2.  an mp3 file of some length say (3 minutes)  </p>
  
  <p>I want to convert this to a .3gp video. How do I do it? </p>
  
  <p>I've tried the following:<br>
  Created a video of zero length(time) using the jpeg image:  </p>
  
  <pre><code>ffmpeg -f image2 -i temp_img.jpg temp_video.mpg
  </code></pre>
  
  <p>Then, I tried to mix the video and audio streams as:</p>
  
  <pre><code>ffmpeg -i temp_sound.mp3 -i temp_video.mpg -vcodec mpeg video_finale.mpg
  </code></pre>
  
  <p>On doing this I get: some error message like "Codec could not be determined(Video:0x000)"</p>
  
  <p>Please help.</p>
  
  <p>Thanks.</p>