Adobe 25520388 User Guide - Page 454

USING ADOBE PREMIERE PRO 449 Exporting Adobe Premiere Pro makes several FLV and F4V file presets available through the Export Settings dialog box. These include preset frame sizes and frame rates for the different television standards at different data rates. Experiment with the various Adobe Media Encoder presets to find the best setting for your project. Use the following list of common frame sizes (in pixels) as a guide: 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 You can stream FLV and F4V files to eliminate download time. FLV and F4V files also have deep interactivity and navigation capabilities when they are streamed. Streaming FLV and F4V files allow you to monitor quality of service. You can stream FLV and F4V files with the Flash Media Server. Alternatively, you can use a hosted service from one of the FLV/F4V Streaming Service partners available through the Adobe website. For more information, see "Delivering Flash Video: Understanding the Difference Between Progressive Download and Streaming Video" on the Flash Developer Center website. Cover progressive download times Learn how long it takes 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 can 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 1 minute to download, give your clip a 33-second buffer. The applied formula is 60 seconds - 30 seconds + 3 seconds = 33 seconds. Remove noise and interlacing For the best encoding, remove noise and interlacing. The higher the quality of the original, the better the final result. Frame rates and sizes of Internet video are smaller than frame rates and sizes of television video. However, computer monitors typically have color fidelity, saturation, sharpness, and resolution at least as good as high-definition televisions. Even with a small window, image quality can be as important for digital video as for HDTV. Artifacts and noise are at least as obvious on a computer screen as on a television screen. FLV files, F4V files, and SWF files are intended for progressive display on computer screens and other devices. Interlaced displays such as TVs do not typically play FLV or F4V files. Interlaced footage viewed on a progressive display can exhibit alternating vertical lines in high-motion areas. Thus, all the FLV and F4V file 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 your project contains audio from a CD, transfer the audio files directly from the CD to your hard disk. Do not record the sound 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. Last updated 1/16/2012