[vlc-devel] Re: Trick mode support for MPEG2 TS

[Måns Rullgård]

"Robert Scheffler" <Bob at pricom.com> writes:

> At any point, we can take this off-line to not confuse the topics...
>
> For a large installation, say 5K - 10K streams, most of the popular content
> is the same, say 100 movies (~200 GB) with many people watching each. Those
> popular titles are fully loaded into DRAM (up to 1TB of DRAM). The less
> popular content is streamed from RAID through the RAM to the client.

OK, that's a *lot* of RAM.  Now it makes sense.

> The tick modes are handled in hardware (FPGA) so that all the
> PTS/DTS and PCR are regenerated with low jitter, the end result is
> very good video quality.
>
> It comes down to deployment size. There is a cross-over point where there
> are more streams than content objects, and where the active titles are much
> lower than the stream count. The cross-over point seems to be about 500
> streams in the US cable market today. Some of the Broadbus deployments are
> in the 10K stream size. For such a deployment to use RAID, you would need
> 10-20 racks full of servers, or one rack with RAM and enough RAID to hold
> the library.

The systems I've worked with have all been rather small by
client-count so I've never had to face those problems.

-- 
Måns Rullgård
mru at inprovide.com

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