mobile TV feature
mobile device, use the region of (SVC), an extension which forms more robust transmission, whether
interest to boost the encoding quality Annex G of the H.264/MPEG-4 AVC over broadcast or IP paths, with a
of the player and the ball, and reduce video compression standard. This, too, more graceful degradation
the quality of the relatively could become a critical part of an performance, as well as giving the
uninteresting background to economically viable mobile TV service. option to provide a tailored mobile
There remain
compensate. Standardising SVC, by ITU-T and service, or even different resolutions
This has a secondary benefit in ISO/IEC, has enabled the encoding of a many for different mobile receivers.
mobile television, where reception is single video stream which contains
business
The advantage of bringing all these
constantly being challenged as the one or more subset bitstreams that
challenges...
techniques together is that a channel
receiver moves. The highly can themselves be decoded
but the good
provider or broadcaster can manage
compressed bitstream is sensitive to independently. A subset bitstream can
news is that
the entire output from a single, hybrid
data loss, but using this process the represent a reduction in spatial or headend. Essentially a single high
theregions of most attention will be more temporal resolution, or a lower video definition SDI feed comes in and there
protected and thus robust to errors. Put quality, or a combination of the three.
technology
are multiple outputs, each tailored to a
simply, if there is any picture break-up Of particular interest here would be
now exists to
specific application.
due to disruption of the bitstream, it is the spatial scalability, in which video is
put the best
The advantages of the hybrid
likely to happen in the part of the coded at multiple resolutions. The data
possible
headend are, again, reduced cost of
image you are not looking at anyway. and decoded samples of lower ownership through simple
perceived
Grass Valley has developed this resolutions are used to predict the management and the ability of the
realtime processing and implemented data in higher resolutions, so this is an image broadcaster to maintain quality control
it in our ViBE mobile television extremely effective way of
quality on
over every output which is taking the
encoder. At present it is the only fully successfully transmitting multiple
the screen,
channel feed.
automatic, fully integrated reframing resolutions in a single bitstream.
whatever
There remain many business
system available to create content that Quality scalability works in much the
size that
challenges to be resolved before
appears to have been created same way: the data and decoded establishing a commercial mobile TV
screen mightspecifically for the very small screen. samples of the lower quality stream service: free to air versus subscription;
Processing is in real time with minimal can be used to predict the higher
be.
3G or broadcast; dedicated mobile
latency so it can be used for any resolutions, so again it is a very transmission standard or everyday
content, including live sport. efficient way of delivering content DVB-T; and many more. The good
The idea of balancing the bit budget within a constrained bandwidth. And, news is that the technology now
across a picture has already been as noted, different scalabilities can be exists to put the best possible
raised. This is one of the potential combined in a single bitstream. perceived image quality on the screen,
benefits of Scalable Video Coding Used skilfully, SVC can provide a whatever size that screen might be.
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www.ibeweb.com l september/october 2009 l ibe l 61
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