HP z545 Información técnica descargar pdf (Pagina 2)

MPEG2 is the current standard video

compression format used around the

world. The biggest drawback of MPEG2

files is that they are quite large. 1 hour of

high quality standard definition video

will be about 1 Gig in size. The biggest

plus for hardware-based encoder cards is

that they will only use about 4–8% of

the CPU. Thus you can continue to use

your system for other tasks while it’s re-

cording TV programs. Currently, high

definition TV sets and recorders are still

fairly expensive, even though high defi-

nition capture cards are relatively cheap.

(See the box titled “High Definition Cap-

ture Cards.”)

Since I currently don’t own a high def-

inition TV set, I chose to go the standard

definition route. Unlike the commercial

DVR products currently available on the

market, you can upgrade your MythTV

system to a high definition setup when

it becomes feasible.

The most popular brand of standard

definition encoder cards is Hauppauge.

The Hauppauge 500 comes with two en-

coder chips and sells for about US$ 160.

Two encoder chips are useful if you want

to watch a program that is different from

the one you’re recording. The Haup-

pauge 250 comes with a single encoder

chip and sells for about US$ 130. In

addition to one encoder chip, the

Hauppauge 350 also comes with a de-

coder chip. This saves considerable re-

sources when playing back recordings.

The 350 model also comes with a com-

bined A/ V connection, breakout cable

(with S-Video, composite video, and ste-

reo audio out) and FM radio receiver and

antennae. The 350 sells for about US$

160. The newest model from Hauppauge

is the 150, which is very similar in func-

tion to the 250 and sells for about half

the cost.

All of the aforementioned Hauppauge

cards are extensively supported in Linux

by the ivtv driver. With the exception of

the MCE version of the Hauppauge 150,

all Hauppauge cards usually come with

remote controls, along with an infrared

receiver for the encoder card.

One of the main requirements for my

MythTV box is that it’s the center of my

home theater setup. Yes, you can use a

standard PC tower case, but it won’t be

very aesthetically pleasing. Therefore,

the case should look like it belongs in

the stereo cabinet with rest of your A/ V

components. I settled on a black Cooler

Master ATC-620 case, which fits perfectly

in my component stereo rack. Since I de-

cided on a Mini-ATX case, I went and

purchased an MSI 651M motherboard.

The next question is how much horse-

power do you need to run MythTV? The

very first time I tried out MythTV, I used

a Hauppauge 350 card with an 800 Mhz

Intel Pentium 3. I was able to get away

with this because of the decoder chip

the 350 uses. These days, processors are

relatively inexpensive. If you’re going to

have the CPU handle playback, you

should get at least a 1.5 GHz processor.

I installed 512 MB memory on my sys-

tem even though the minimum require-

The current list of MyTV add-on appli-

cations is quite impressive:

• Myth Browser – web browser

• Myth DVD – DVD manager/ player that

lets you rip DVDs

• Myth Flix – view your movie queue

from Netflix (popular on-line movie

rental service)

• Myth Gallery – photograph manager/

viewer

• Myth Game – play your favorite old

school video games via game emu-

lation

• Myth Music – audio file manager/

player that lets you rips CD s into your

favorite formats

• Myth News – RSS feed reader

• Myth Phone – SIP based VOIP

• Myth Stream – listen to streaming

audio content from the internet

• Myth Stream TV – stream your TV

recordings over your network via VLC

• Myth Video – video player for files not

recorded via MythTV

• Myth Weather – weather forecasts for

your local area

• Myth Web – control the scheduling of

recordings via the web

• Myth Burn – archive recorded shows

to DVD

MythTV Add-ons

Figure 1: From the outside, my home-built MythTV box looks like a

standard home media device.

Figure 2: The inside of my MythTV box looks much more like an ordi-

nary PC.

Some examples of high definition

capture cards include:

• Air2PC PCI (8VSB)

• pcHDTV-2000 (8VSB)

• Air2PC HD5000 (8VSB, QAM256) –

US$ 120 (EUR 95)

• pcHDTV-3000 (8VSB, QAM256) –

US$ 170 (EUR 135)

• dvico Fusion HDTV Lite 5 (8VSB,

QAM256) – US$ 120 (EUR 95)

High Definition

Capture Cards

KNOW-HOW

MythTV

ISSUE 71 OCTOBER 2006

W W W . L I N U X

M A G A Z I N E . C O M

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TV IN LINUX 1
KNOW-HOW 2

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