title: ffmpeg error on DVCPRO HD encoding is not supported
body: <p>Please help, I'm trying to encode a video stream, and output the video using the same format as my input:</p>
  <pre><code>ffmpeg -i input.mov -c:v dvvideo -pix_fmt yuv422p -b:v 115084915 -maxrate 115084915 -minrate 115084915 -r 29.97 -top 1 -color_primaries bt709 -color_trc bt709 -colorspace bt709 -vtag dvh6 -c:a copy -c:s copy -y output.mov
  </code></pre>
  <p>this is the output:</p>
  <pre><code>DVCPRO HD encoding is not supported.\n[dvvideo @ 0x7ffaee815c00] ff_frame_thread_encoder_init failed\nError initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height\nConversion failed!\n&quot;
  </code></pre>