Theo Verelst Local Diary Page 88
I've ditched the usual header for the
moment, I think it doesn't help much anyhow.
This page is copyrighted by me, and may be read and transferred by any
means only as a whole and including the references to me. I
guess that's normal, the writer can chose that of course, maybe
Ill make some creative commons stuff one day, of course I have
made Free and Open Source software and even hardware designs available!
This
page is under construction, so check back later, too.
Dec 4, 02:39, 2009
Some Ikea based customizing:
Less obscured view after storm taking down the partytent frame after
more than a little time of withstanding the elements:
Car radio/CD player booster!
I had this lying around doing nothing, the second hand car I regularly
use has a big woofer, so I thought I´d replace the built in
booster/filter with this big one:
It´s actually like 4x 100 to 150 watts or so, and I put 2
channels in bridge and the filter at about 80 Herz, or maybe higher:
The result with a Pioneer radio/CD player are great, lots better low,
and the total power can be up to really loud and a nice sound.
There's a thick cable coming directly from the big battery (with a 50
amp fuse) which feeds the booster. At high volume, the lights visibly
dim with big booster power.
BBC HD in shining splendor
This is a night picture of a new sat dish or only about 20 euros:
The above is NOT a High Definition picture, but a "normal" but pretty
good quality video cam working in nightshot/slow color shutter mode,
encoded via analog svhs signal by the pinnacle hardware mpeg-2 encoder
box, and rendered (live over network) by mplayer with filters on, an
magnification.
With cable input it can look like this (no magnification):
First a comparison between a cable channel and sat channel of the same
film, time shifted (mplayer can record in memoy while paused) to be
more or less showing the same frames:
The sat chennel of I guess 3.5 Mb/s is more clean-looking, but I'd
think the cable can be more lively and can contain more information.
The new dish is directed at the Astra 2 sat, so it can receive BBC HD,
the
official HD test with unscrambled signal, and I moved it a bit to be at
least less obscured by a few tree branches, and made the 60cm metal
(was 40 cm plastic) dish a bit more stable by a support beam.
I used the Linux sat tools I have downloaded or compiled to get
normal sat channels (digital) with mplayer, and perceive not so many
bit errors any more.
In fact I after weeks of searching and thinking can now take the not so
many faults containing BBC HD signal using ´dvbgrab´, feed
the whole transport stream to mplayer, make it filter the right program
stream, have it use the VDPAU facilities for decoding the h264 HD
stream, and have it synchronize itself properly ove the 4 channels
48kHz ac3 audio and get live, good looking brilliant HD video on the 28
inch monitor (i n 1920x1080 pixels)!!!
Mind you, the above and two below frames are unprocessed frames from
the sat channel, and they move at full framerate (25 full frames per
second) with blocks hardly ever appearing and motions pretty good most
of the time, and regularly bluray-like, so this can be viewed like
normal TV, but than in HD, with almost nothing being wrong enough to
notice.
I recorded the whole transport stream of these 10 minutes of top gear,
of course that takes up much more disk space than needed, but that
works.
Also, I use 4 audio channels of top quality (all Lexicon 24 bt
converters) on my big audio system, which is great for listening to the
surround sound of fair (but of course not DTS) quality.
Great work!
Audio Engineering Society Meeting at the Hague Conservatory
I recorded a minute or twp of HD there, this is a frame of that:
