Panasonic AG-HMC80PJ Brochure - Page 5

AVCCAM

Panasonic

AVCCAM

camera

recorders

use

the

AVCHD

format

for

tapeless

recording

with

high

image

quality

and

low

bit

rates.

This

format

complies

with

the

latest

H.264

motion

image

compression

standard,

and

employs

the

High

Profile

standard

to

improve

compression

efficiency.

Featuring

twice

the

compression

efficiency

of

HDV

(MPEG-2),

the

AVCCAM

series

achieves

extended

HD

recording.

Comparison

of

HD

Recording

Formats

Pixel

(H

x

V)

Compression

Method

1440

x

1080

1920

x

1080

MPEG-2

MPEG-4

AVC/H.264

MPEG-4

AVC/H.264

Technologies

•Intra-Frame

Prediction

This

process

generates

predictive

pixels

based

on

the

adjacent

pixels

within

each

frame.

It

then

selects

the

optimal

predictive

mode.

The

generated

predictive

image

is

subtracted

from

the

original

input

image,

and

the

residual

data

is

compressed

and

recorded

at

a

low

bit

rate.

The

entire

process

is

conducted

within

the

frame,

so

prediction

accuracy

remains

high

even

with

fast

-motion

images.

•Variable

Block

Size

Motion

Compensation

In

contrast

with

MPEG-2,

in

which

inter

-frame

compression

based

on

the

correlation

between

adjacent

frames

uses

fixed

blocks

of

16

x

16

pixels,

AVCHD

divides

the

blocks

into

multi

-sizes

as

small

as

4

x

4

pixels.

In

this

method,

it

is

able

to

use

large

blocks

to

process

images

that

show

only

slight

changes

on

the

screen,

and

smaller

blocks

to

process

images

that

have

considerable

change.

This

raises

the

accuracy

of

motion

compensation

to

boost

the

quality

of

fast

-motion

images

while

increasing

compression

efficiency.

MPEG-2

(fixed

block

size)

MPEG-4

AVC/H.264

(variable

block

size)

Blocks

of

the

same

size

are

used

to

process

Block

size

is

precisely

varied

to

match

the

size

parts

both

with

and

without

motion.

of

the

moving

part

contained

in

each

block.

16

x

16

16x8

11

8

x

16

16

x

16

V'

s

r

•

Loop

Filter

Prevents

the

Propagation

of

Compression

Distortion

Because

MPEG-2

uses

a

decoding

image

that

contains

compression

induced

block

distortion

as

a

reference

image

for

motion

compensation,

it

exhibits

residual

distortion

—

even

within

the

same

frame

—

when

a

large

amount

of

block

distortion

is

generated.

MPEG-4

AVC/H.264

detects

block

distortion

in

the

decoding

image

and

removes

it

with

a

contextadaptive

filter

that

functions

according

to

the

degree

of

distortion.

This

prevents

the

propagation

of

block

distortion

by

keeping

the

reference

image

clean

at

all

times.

•New

CABAC

Entropy

Encoding

The

AVCHD

format

uses

CABAC

(Context

Adaptive

Binary

Arithmetic

Coding)

for

its

variable

-length

encoding.

Compared

with

the

variablelength

encoding

of

MPEG-2,

in

which

the

compression

efficiency

is

greatly

affected

by

subject

type,

CABAC

provides

lossless

compression

with

constantly

high

efficiency

and

no

distortion

for

virtually

all

subject

types.

Because

MPEG-2

compresses

and

converts

data

according

to

the

standard's

fixed

conversion

rules,

the

compression

efficiency

may

drop

for

image

types

other

than

those

that

were

considered

when

the

standard

was

established.

In

place

of

fixed

conversion

rules,

CABAC

provides

the

best

possible

conversion

method

by

constantly

optimizing

and

automatically

tracking

the

image

that

is

being

processed,

in

parallel

with

the

compression

process.

The

AVCCAM

series

features

the

image

-enhancing

PH

mode

that

Panasonic

developed

exclusively

for

AVCCAM

camera

recorders.

It

delivers

a

maximum

AVCHD

bit

rate

of

24

Mbps

(average:

21

Mbps).

Designed

for

professional

image

production,

this

mode

lets

you

record

the

AVCCAM

series's

1920

x

1080

full

-raster

HD

images.

*An

AVCCAM

may

not

be

able

to

record

all

formats

above.

Please

check

the

specification

of

the

camera

recorder

or

recorder.

Records

for

180

minutes

(approx.)

in

the

highest

-quality

(PH)

mode

PH

Mode

1920

x

1080

Approx.

21

Mbps

(Average),

Approx.

180

minutes

O

1280

x

720

Max.

24

Mbps

O

X

HA

Mode

1920

x

1080

Approx.

17

Mbps

(Average)

Approx.

240

minutes

HG

Mode

1920

x

1080

Approx.

13

Mbps

(Average)

Approx.

320

minutes

HE

Mode

1440

x

1080

Approx.

6

Mbps

(Average)

Approx.

720

minutes

DV

Mode*

,

720

x

480/720

x576

Approx.

25

Mbps

(Average)

Approx.

128

minutes

*A

Class

6

or

higher

SDHC

or

SD

Memory

Card

is

required

for

DV

recording.

A

Class

4

or

higher

SDHC

or

SD

Memory

Card

is

required

for

PH

and

HA

recording.

Use

a

Class

2

or

higher

SDHC

or

SD

Memory

Card

for

other

modes.

(Panasonic

SDHC

or

SD

Memory

Cards

are

recommended.)

*1:

AG-HMC80

series

only

has

DV

mode.

Unlike

with

videotape,

there's

no

need

for

cueing

with

the

SDHC/SDXC*'

Memory

Card

because

recording

automatically

begins

in

a

blank

section

of

memory.

Nor

do

you

have

to

worry

about

accidentally

recording

over

important

footage.

You

can

delete

unwanted

clips

instantly

right

on

the

spot

to

preserve

memory

capacity.

Editing

after

shooting

is

smooth

and

easy,

with

no

need

for

digitising.

'Combined

with

a

maximum

data

transfer

speed

of

22

MB/s,'

2

this

makes

data

transfers

to

computers

easy

and

effortless.

•SDHC/SDXC*

1

Memory

Cards

are

inexpensive

and

can

be

easily

purchased

on

location

when

needed.

*1:

The

SDXC Memory

Card

can

be

used

only

with

the

AG-AF100

series.

*2:

Data

transfer

speed

varies

depending

on

the

usage

of

SD

devices.

The

speed

given

here

is

the

maximum

speed

according

to

Panasonic

specifications.

•Shot

mark

To

simplify

shot

selection,

you

can

add

a

mark

to

the

thumbnail

images

of

each

clip.

You

can

then

display

and

play

only

the

clips

that

have

shot

marks.

•Pre-REC

This

helps

to

ensure

you

always

get

the

shot

you

want,

by

letting

you

continuously

store,

and

subsequently

record,

images

and

sounds

for

three

seconds

before

the

REC

button

is

pressed

in

standby

mode.

AG-HMR10

can

be

used

only

when

combined

with

the

AG-HCK10G.

You

can

check

the

end

of

the

most

recently

recorded

clip

with

one

-touch

ease.

AG-HMR10

can

be

used

only

when

combined

with

the

AG-HCK10G.

•Last

clip

delete

Only

the

most

recently

recorded

clip

is

deleted

with

this

one

-touch

function,

adding

practical

convenience

to

everyday

operation.

It

can

be

assigned

as

a

User

button

function

if

desired.

•Meta

-data

recording

The

date,

camera

operator,

location,

title

and

other

information

can

be

added

to

the

video

data.

*

AG-HMC80

series

can

be

used

only

in

AVCHD

mode.

•

INDEX

Index

flags

can

be

added

to

any

desired

points

in

a

clip

during

recording

or

playback.

Up

to

100

index

flags

can

be

added

to

each

clip.

*

For

the

AG-AF100

series,

AG-HMC150

series

and

AG-HMR10.

05

Panasonic AG-HMC80PJ Brochure - Page 5

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