Managing the Encoder
Configuring Streaming Outputs
Makito
X User’s Guide, v2.2, Issue 02
132
Bandwidth Overhead for CBR Streams with Metadata
In CBR streams with Traffic Shaping enabled, metadata may cause the stream to exceed
the bandwidth overhead (video b bandwidth overhead percentage). Therefore, when
configuring the bandwidth overhead percentage, you need to take into account how much
metadata is being generated.
Metadata is not part of the minimum bandwidth calculation used for CBR streams (because
it is application dependent). The bandwidth for it is presumed to fit within the bandwidth
overhead which is specified at stream creation. However, as the video bitrate drops, the
overhead needed to accommodate the worst case bandwidth usage of the metadata must
increase.
For example:
bandwidth overhead = ( metadata_bitrate / ( video_b audio_bitrate ) )
* 100
Minimum bandwidth overhead should be no less than 5. For example:
metadata_bitrate = 500 Kbps, video_bitrate = 1000 Kbps, audio_bitrate =
128 Kbps
bandwidth overhead = ( 500 / ( 1000 + 128 ) ) * 100 = 44