Adobe 65021048 User Manual page 416

ADOBE PREMIERE PRO CS3 410
User Guide
Adobe Premiere Pro makes several Adobe Flash Video presets available through Adobe Media Encoder. These
include preset frame sizes and frame rates for the different television standards at different data rates. Use the
following list of common frame sizes (in pixels) as a guide, or experiment with the various Adobe Media Encoder
presets to find the best setting for your project.
162 x 120
Modem NTSC 4 x 3
160 x 120
Modem PAL 4 x 3
648 x 480
T1/DSL/cable NTSC 4 x 3
768 x 576
T1/DSL/cable PAL 4 x 3
Stream for best performance
To eliminate download time, provide deep interactivity and navigation capabilities, or monitor quality of service,
stream Adobe Flash Video files with the Flash Media Server or use the hosted service from one of Adobe's Flash
Video Streaming Service partners available through the Adobe website. For more details on the difference between
Progressive Download and Streaming with Flash Media Server, see "Delivering Flash Video: Understanding the
Difference Between Progressive Download and Streaming Video" on the Flash Developer Center website.
Know progressive download times
Know how long it will take to download enough of your video so that it can play to the end without pausing to finish
downloading. While the first part of your video clip downloads, you may want to display other content that
disguises the download. For short clips, use the following formula: Pause = download time – play time + 10% of play
time. For example, if your clip is 30 seconds long and it takes one minute to download, give your clip a 33-second
buffer (60 seconds – 30 seconds + 3 seconds = 33 seconds).
Remove noise and interlacing
For the best encoding, you might need to remove noise and interlacing.
The higher the quality of the original, the better the final result. Although frame rates and sizes of Internet video are
usually smaller than those of television, computer monitors have much better color fidelity, saturation, sharpness,
and resolution than conventional televisions. Even with a small window, image quality can be more important for
digital video than for standard analog television. Artifacts and noise that are barely noticeable on TV can be obvious
on a computer screen.
Adobe Flash is intended for progressive display on computer screens and other devices, rather than on interlaced
displays such as TVs. Interlaced footage viewed on a progressive display can exhibit alternating vertical lines in
high-motion areas. Thus, all the Adobe Flash Video presets in the Adobe Media Encoder have deinterlacing turned
on by default.
Follow the same guidelines for audio
The same considerations apply to audio production as to video production. To achieve good audio compression,
begin with clean audio. If you are encoding material from a CD, try to record the file using direct digital transfer
instead of through the analog input of your sound card. The sound card introduces an unnecessary digital-to-analog
and analog-to-digital conversion that can create noise in your source audio. Direct digital transfer tools are available
for Windows and Macintosh platforms. To record from an analog source, use the highest-quality sound card
available.
April 1, 2008