COMP: Portrait device playlists only support the yuv420p colormap (#60)

* COMP: Portrait device playlists only support yuv420p colormaps

It isn't well described on their website, but Portrait devices
require you to use yuv420p colormap if you want to sync an mp4
with the device for stand-alone playback.   This isn't a requirement
if you only want to playback on connected devices.

Examples/Python/cinematic_rendering/head_and_neck_animation.py

@@ -12,11 +12,12 @@
 it may need to be converted. Here's an example of a conversion
 using ffmpeg:
 
-ffmpeg -i input_file.ogv -c:v libx265 -crf 10 output_file.mp4
+ffmpeg -i input_file.ogv -c:v libx265 -pix_fmt yuv420p -crf 10 output_file.mp4
 
-Where `libx265` specifies to use the h.265 video codec, and `crf`
+Where `libx265` specifies to use the h.265 video codec, `crf`
 specifies the video quality (where 0 is lossless and 51 is the lowest
-quality).
+quality), and 'pix_fmt' is required if you want to include the
+mp4 in a playlist that is sync'd with a portrait device.
 
 Example output of this script that was generated for a 16" device and
 converted to MP4 may be found here:
@@ -66,9 +67,7 @@
 # renWin.SetSize(800, 800)
 renWin = vtkRenderingLookingGlass.vtkLookingGlassInterface.CreateLookingGlassRenderWindow()
 
-if renWin.GetDeviceType() == "standard":
-    # This looks better on large settings
-    renWin.SetDeviceType("large")
+renWin.SetDeviceType("portrait")
 
 renWin.AddRenderer(ren)