Adobe 65021048 User Guide - Page 415

ADOBE PREMIERE PRO CS3 409 User Guide Alternatively, because Flash can be used to create animations, you can start a movie as a Flash project, export it as a QuickTime file, then import the QuickTime file into Adobe Premiere Pro for editing. In Adobe Premiere Pro, for example, you could add titles or mix the animation with other video sources. 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. Strive for simplicity Avoid elaborate transitions-they don't compress well and can make your final compressed video look "chunky" during the change. Hard cuts (as opposed to dissolves) are usually best. Eye-catching video sequences-for instance showing an object zooming from behind the first track, doing a "page peel," or wrapping around a ball and then flying off the screen-don't compress well and should be used sparingly. Know your audience data rate When you deliver video over the Internet, produce files at lower data rates. Users with fast Internet connections can view the files with little or no delay for loading, but dial-up users must wait for files to download. Make the clips short to keep the download times within acceptable limits for dial-up users. Select the proper frame rate Frame rate indicates frames per second (fps). If you have a higher data rate clip, a lower frame rate can improve playback through limited bandwidth. For example, if you are compressing a clip with little motion, cutting the frame rate in half probably saves you only 20% of the data rate. However, if you are compressing high-motion video, reducing the frame rate has a much greater effect on the data rate. Because video looks much better at native frame rates, leave the frame rate high if your delivery channels and playback platforms allow. For web delivery, get this detail from your hosting service. For mobile devices, use the device-specific encoding presets, and the device emulator available through Adobe Media Encoder in Adobe Premiere Pro. If you need to reduce the frame rate, the best results come from dividing the frame rate by whole numbers. Note: When you embed video clips in the SWF file, the frame rate of the video clip must be the same as the frame rate of the SWF file. To encode video using the frame rate of the FLA file, use the Advanced Video Encoding settings in the Flash Video Import wizard. Select a frame size that fits your data rate and frame aspect ratio At a given data rate (connection speed), increasing the frame size decreases video quality. When you select the frame size for your encoding settings, consider frame rate, source material, and personal preferences. To prevent pillarboxing, it's important to choose a frame size of the same aspect ratio as that of your source footage. For example, you get pillarboxing if you encode NTSC footage to a PAL frame size. April 1, 2008