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I can see that generally the content meta data "StreamBitrates" is usually set to 0 for hls for adaptive bitrate switching. but is there any way I can actually set through brightscript an initial buffer of say, 10 seconds before the video starts playing for a HLS stream?
There is no way for you to specify the buffer time. However, if you know what the highest bitrate in your HLS variant list is, you could set it to that. This is currently required as a workaround for a Roku bug if the highest bitrate is less than 1.5 Mbps.
I use mediainfo to figure out what the bitrate of a video is. http://mediainfo.sourceforge.net/en In their sample picture the bitrate is 1852. Most video encoders (if you encode it yourself) allow you to specify what bitrate the finished file should be.
