[mythtv-users] HD reference files?
decepticon at gmail.com
Tue Mar 6 16:02:13 UTC 2007
this is a good idea. there should be some sort of standard benchmark
for myth. a script capable of analysing the results and making
suggestions for tweaks based on the results would be awesome. probably
not a very easy project, but it would be cool. SoC 07?
sort of like the old days where everyone would run the quake2 demo and
tweak until they had a framerate worthy of bragging to their friends
On 3/5/07, Brian Wood <beww at beww.org> wrote:
> On Mar 5, 2007, at 6:00 PM, David Murphy wrote:
> > As hardware requirements for HD/SD playback are a constant theme I was
> > wondering if there are any HD reference files that are freely
> > available
> > on the net? I know there are plenty of movie trailers etc but what I
> > had in mind was a small set of like 10-15 second clips at the various
> > common formats 1080i/p, 720p, 480p etc.
> Look at:
> > It would be nice if these clips were perhaps the most complex and
> > demanding scenes possible, designed to push decoding requirements as
> > high as possible. Mythtv users could then download a small test set of
> > files, dump them on their hardware and see how a given hardware config
> > handles a common reference.
> There are several "worst case" videos used in broadcast, including
> the tulips waving in the wind, the merry-go-round, the slow-speed
> chopper rotors etc. Some of them are on the Radio Shack 44-1250 test
> DVD but as they are already MPEG-2 they are for testing decoder
> setups, to test encoders you'd have to have a source of "perfect"
> baseband video, not cheap for HD.
> If you used an HD signal from cable, satellite or OTA you would have
> at least 2 sets of encoder/decoders and possibly more, as some
> broadcasters actually use MPEG for transport and backhaul.
> CBS transports as MPEG, decodes at the affiliate station to get
> baseband so they can switch it, then re-encodes to MPEG. Fox uses a
> different method, they have a device that lets them insert
> commercials and the like directly into the MPEG stream, more
> expensive gear but it saves a decode/encode step.
> mythtv-users mailing list
> mythtv-users at mythtv.org
More information about the mythtv-users