mmance@mmance-studio:~/games/RimWorld657Linux⟫ glc-play rimraw.glc -o - --resize=1920x1080 -y 1 | avconv -i - -vcodec dnxhd -b:v 115m test.mp4
avconv version 9.16-6:9.16-0ubuntu0.14.04.1, Copyright (c) 2000-2014 the Libav developers
  built on Aug 10 2014 18:16:02 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
[yuv4mpegpipe @ 0x1357100] Estimating duration from bitrate, this may be inaccurate
Input #0, yuv4mpegpipe, from 'pipe:':
  Duration: N/A, bitrate: N/A
    Stream #0.0: Video: rawvideo, yuv420p, 1920x1080, 30 tbr, 30 tbn
[dnxhd @ 0x13582a0] video parameters incompatible with DNxHD
Output #0, mp4, to 'test.mp4':
    Stream #0.0: Video: dnxhd, yuv422p, 1920x1080, q=2-31, 90k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> dnxhd)
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height