Adobe 65021048 User Guide - Page 428

ADOBE PREMIERE PRO CS3 422 User Guide Fields Choose an option if required for your final medium. Lower Field First is the default. No Fields is the equivalent of progressive scan, which is the correct setting for computer display and motion picture film. Choose Upper Field First or Lower Field First when exporting video for an interlaced medium, such as NTSC, PAL, or SECAM. The option you should choose depends on the specific video hardware you use. Deinterlace Video Footage Select this option if the video content in the sequence is interlaced and you are exporting to a noninterlaced medium, such as motion picture film or progressive scan video. Deinterlacing can also make it easier to apply high-quality effects in another program, such as Adobe After Effects. If the sequence content does not have fields, don't select this option; instead select No Fields from the Fields option. Optimize Stills Select this option to use still images efficiently in exported video files. For example, if a still image has a duration of 2 seconds in a project set to 30 fps, Adobe Premiere Pro creates one 2-second frame instead of 60 frames at 1/30 of a second each. Selecting this option can save disk space if you used still images. Deselect this option only if the exported video file exhibits playback problems when displaying the still images. Keyframe Every _ Frames Select and type the number of frames after which the codec will create a keyframe when exporting video. Add Keyframes at Markers Select this option to create keyframes only where markers exist in the Timeline window. For this to work, markers must exist in the Timeline window (see "Add markers" on page 146). Add Keyframes at Edits Select this option to create a keyframe at edit points in the Timeline window. Note: Some codecs do not provide control over keyframes. In such codecs, the above options will not be available. Audio export settings The following options are available in the Audio panel of the Export Movie Settings dialog box and the Export Audio Settings dialog box: Compressor Specify the codec for Adobe Premiere Pro to apply when compressing audio. The codecs available depend on the File Type you specified in the General panel in the Export Movie Settings or Export Audio Settings dialog box. Some file types and capture cards support only uncompressed audio, which has the highest quality, but uses more disk space. Check with your capture card's documentation before choosing an audio codec. Advanced Settings Click to access codec-specific options. This option is not available for all codecs. Consult the codec's documentation or its developer's website for more guidance on choosing advanced settings. Sample Rate Choose a higher rate to increase the frequency at which audio is converted into a discrete digital value, or sampled. Higher sample rates increase audio quality and file size; lower sample rates decrease quality and file size. However, setting the sample rate higher than the audio's sample rate at the time of recording will not increase quality. Setting a different rate than the source files' audio, or resampling, requires additional processing time. You can avoid resampling by capturing audio at the same rate at which you want to export it. Sample Type Choose a higher bit depth to increase accuracy of audio samples, which can improve dynamic range and reduce distortion, especially if the audio undergoes additional processing, such as filtering or resampling. Higher bit depths also increase processing time and file size; lower bit rates reduce processing time and file size. However, setting the bit depth higher than the audio's bit depth at the time of recording will not increase quality. Channels Specify how many audio channels are in the exported file (see "About channels in audio clips" on page 183). If you choose fewer channels than are in the sequence's master track, the audio will be downmixed (see "About audio tracks in a sequence" on page 182). Interleave Specify how often audio information is inserted among the video frames in the exported file. See your capture card documentation for the recommended setting. A value of 1 frame means that when a frame is played back, the audio for the duration of that frame is loaded into RAM so that it can play until the next frame appears. If April 1, 2008