title: An x264-encoded video only with P frames and a different video for I frame
body: <p>Suppose I have 5 frames, I encode first one as the I or reference frame and all other as P frames in one video using x264 codec. </p>
  
  <p>In this case, is it possible to have 2 videos, one only with an I frame and another frame only with 4 P frames?</p>
  
  <p>To decode all 4 P frames, I require the first I frame video but can we construct the videos in this way?</p>