MACROMEDIA FLASH 8-DEVELOPING FLASH LITE 2.X Instrukcja Użytkownika Pobierz pdf (Strona 13)

Adobe Flash CS3 Classroom in a Book

Lesson 9: Working with Sound and Video

In Lesson 9, students bring audio and video ﬁles

together with ActionScript to create a dynamic, interac-

tive wildlife preserve kiosk. As they work through the

project, students learn how to edit audio ﬁles, import

and optimize video ﬁles, and add ActionScript to load

external ﬁles.

Editing a sound clip

In Flash, you can change the point at which a sound

starts and stops playing, or control the volume of the

sound as it plays. In this lesson, students remove half

of the waveform of a sound to shorten the sound clip.

To edit a sound ﬁle, ﬁrst add it to a frame, and click

Edit in the Property inspector.

• To change the start and end points of a sound, drag

the Time In and Time Out controls in the Edit Enve-

lope.

• To change the sound envelope, drag the envelope

handles to change levels at different points in the

sound. Envelope lines show the volume of the sound

as it plays. To create additional envelope handles (up

to eight total), click the envelope lines. To remove an

envelope handle, drag it out of the window.

• To display more or less of the sound in the window,

click the Zoom In or Out buttons.

• To switch the time units between seconds and frames,

click the Seconds and Frames buttons.

Preparing Flash video content

Before you import video into Flash, consider what vid-

eo quality you need, what video format to use, and how

to download it. When you embed a video into a Flash

document, it increases the size of the ﬁnal SWF ﬁle that

you publish. The embedded video starts progressively

downloading to the viewer’s computer whether or not

they view the video.

You can also progressively download or stream the vid-

eo at runtime from an external Flash Video (FLV) ﬁle

on your server. When it starts downloading depends on

how you structure your application.

Note: Video progressively downloads from the server

like SWF ﬁles, which is not actually streaming.

Dynamically loading content has distinct advantages

over keeping all your content in a single SWF file.

For example, file sizes are smaller and load more

quickly, and viewers download only what they want

to see or use.

You can display external FLV video using a compo-

nent or a video object. A component makes develop-

ing applications with FLV video easy, because the

video controls are prebuilt, and you only need to

specify an FLV ﬁle path to play the content. The FLV-

Playback component in Flash CS3 Professional has a

smaller ﬁle size than Media components in earlier ver-

sions of Flash. It is usually a good idea to give viewers

some control (such as the ability to stop, pause, play,

and resume the video, and control volume) over the

video in a SWF ﬁle.

For more control over a video instance than the Video

class allows, place video inside a movie clip instance.

The video’s timeline plays independently from a Flash

timeline, and you can place the content inside a movie

clip to control timelines.

Tips for creating Adobe Flash Video

Follow these guidelines to deliver the best possible

Flash video:

Work with video in the native format of your project until

your ﬁnal output

If you convert a precompressed digital video format

into another format such as FLV, the previous encoder

can introduce video noise. The ﬁrst compressor already

applied its encoding algorithm to the video, reducing

its quality, frame size, and rate. That compression may

have also introduced digital artifacts or noise. This

additional noise affects the ﬁnal encoding process, and

a higher data rate may be required to encode a good-

quality ﬁle.

LESSON 9

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