How to use the HM-11 for YUV to HEVC encoding?
<p>Hi every body I'm using HM-11 to encode YUV video in HEVC streams but I am having 3 problems: </p>

<ol>
<li><p>When I set the frame size to 720x1280, the ffplay of ffmpeg shows no a too blurred video. One while with cif format (352x288) I can view it. What else do I have to set up to be able to view it.</p></li>
<li><p>I’am gettingthis warning :</p>

<pre><code>HM software: Encoder Version [11.0][Windows][VS 1600][32 bit]
******************************************************************
** WARNING: --SEIDecodedPictureHash is now disabled by default. **
**          Automatic verification of decoded pictures by a     **
**          decoder requires this option to be enabled.         **
******************************************************************

Error: found fewer Reference Picture Sets than GOPSize
Error: Invalid GOP structure given
</code></pre>

<p>What does that mean and how can I avoid this warning?</p></li>
<li><p>The last is the one above about the GOP size, how can I variate it?</p></li>
</ol>