title: ffmpeg - automatically chopped?
body: <p>I have an ISO file that I would like to encode it out to mp4 in parts so it's easier to upload to youtube. I am not sure how it handles with chapters etc in this iso file. I have tried</p>
  
  <pre><code>ffmpeg -i file.iso newfile.mp4
  </code></pre>
  
  <p>which works great however it's one large file.</p>
  
  <p>I have google and read some where that says if you put a % within the output file, it should automatically give you parts of the video based on the -t you set, so I went ahead and did this</p>
  
  <pre><code>ffmpeg -i file.iso -t 30 newfile%.mp4 
  </code></pre>
  
  <p>however, the above does not work as it only give me 30 seconds with the file name: newfile%.mp4 </p>
  
  <p>Thanks for your time and hoping I can get some help with this. Thank you in advance!</p>