Roku Developer Program

[bmckim]

We are currently working with Rhozet (http://www.rhozet.com/carbon_coder.html) tech support to help them tune their HLS preset. Their current preset works fine with the iPhone/iPad, but the Roku runs into trouble. We have found that different h264 settings cause the Roku to stutter during playback, however have not been able to pinpoint which. Does Roku have a definitive h264 advanced encode guide? Or does anyone know if there are specific settings the Roku has trouble with?

[RokuKevin]

The encoding quide is in the SDK contains this info:

% cat /usr/share/ffmpeg/libx264-roku.ffpreset
coder=1
flags=+loop
cmp=+chroma
partitions=+parti8x8+parti4x4+partp8x8+partb8x8
me_method=umh
subq=8
me_range=16
g=250
keyint_min=25
sc_threshold=40
i_qfactor=0.71
b_strategy=2
qcomp=0.6
qmin=10
qmax=51
qdiff=4
bf=4
refs=4
directpred=3
trellis=1
flags2=+wpred+mixed_refs+dct8x8+fastpskip

[bmckim]

Thanks, Kevin. With the newest update of Carbon Coder they have fixed the issue and using their HLS preset produces files that play very well on the Roku.