Adobe 65021048 User Guide - 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. Modem NTSC 4 x 3 162 x 120 Modem PAL 4 x 3 160 x 120 T1/DSL/cable NTSC 4 x 3 648 x 480 T1/DSL/cable PAL 4 x 3 768 x 576 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