title: FFmpeg: Multiple x265-params are not recognized
body: <p>I'm using ffmpeg in x265 and I want to use multiple <code>x265-params</code> in one encoding.</p>
  
  <p>When I use more than one parameter, ffmpeg does not recognize them.</p>
  
  <p>My script is:</p>
  
  <pre><code>ffmpeg -s:v 1440x1080 -r 25 -i incident_10d_1440x1080_25.yuv -c:v rawvideo \
  -pix_fmt yuv420p -c:v libx265 -x265-params "--qp=16:--preset=medium:--psnr" \
  out_1440x1080_qp16.mp4
  </code></pre>
  
  <p>I set quantization parameter value equal to 16.</p>
  
  <p>But my output in terminal contains the following:</p>
  
  <pre><code>x265 [info]: Main profile, Level-4 (Main tier)
  x265 [info]: Thread pool created using 4 threads
  x265 [info]: Slices                              : 1
  x265 [info]: frame threads / pool features       : 2 / wpp(17 rows)
  x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
  x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
  x265 [info]: ME / range / subpel / merge         : hex / 57 / 2 / 2
  x265 [info]: Keyframe min / max / scenecut / bias: 25 / 250 / 40 / 5.00
  x265 [info]: Lookahead / bframes / badapt        : 20 / 4 / 2
  x265 [info]: b-pyramid / weightp / weightb       : 1 / 1 / 0
  x265 [info]: References / ref-limit  cu / depth  : 3 / on / on
  x265 [info]: AQ: mode / str / qg-size / cu-tree  : 1 / 1.0 / 32 / 1
  x265 [info]: Rate Control / qCompress            : CRF-28.0 / 0.60
  </code></pre>
  
  <p>As can be seen I get <code>Rate Control / qCompress : CRF-28.0 / 0.60</code>.</p>
  
  <p>The correct one must be <code>x265 [info]: Rate Control : CQP-16</code>.</p>
  
  <p>When I have only this parameter in <code>x265-params</code> like <code>-x265-params "--qp=16"</code> it's working properly.</p>