Autodesk 62205-051408-9001 User Guide - Page 807
Choosing a QuickTime Compressor, Animation, Cinepak, Component Video, DV NTSC and DV PAL, Graphics
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Format Options ❚❘❘ 6. Adjust the following options, as required. Use: Quality Frames Per Second Key Frame Every Limit Data Rate To To Set the Spatial Quality (compression of each frame's pixel data). Enter the frame rate of the final QuickTime movie. This setting will override the frame rate setting of the composite. Add a complete frame at the specified interval. Most codecs add keyframes when necessary, usually when the difference between frames is greater than 90%. Create a movie that "maxes out" at the specified data rate per frame. Use this option (if the selected codec supports it) to create movies optimized for CD-ROM or web playback. Note: When choosing a frame rate, you should note that the human eye requires at least 12 frames per second to be "tricked" into seeing motion. With anything below this, the motion may not be smooth. 7. Click OK. Choosing a QuickTime Compressor The following options are typically available when standard Apple® QuickTime software is present. However, they may vary depending on your installation. You must select both the compressor type and the number of colors present in the QuickTime file. To output a file containing an alpha channel along with color information, select either Animation or None from the Compressor list and Millions of Colors+ from the Compressor color list. Note: Not all compressors can handle all color resolutions. Animation-Uses run-length encoding to compress frames of the movie. This compressor uses a lossless method when the Quality slider is set to 100%, and a lossy method otherwise. This codec supports all color depth resolutions, including alpha channels. Cinepak-Uses a compression algorithm that allows for fast decompression at the expense of relatively slow compression. It is well suited for playback on the computer via a CD-ROM or other media. Cinepak is a lossy method regardless of the quality setting. However, you can usually get realtime playback with a wide variety of processor speeds using this codec. Alpha channels are not supported. Component Video-Uses a compression algorithm optimized for YUV color space. This method can be slow in both compressing and decompressing a movie, and as such, is usually used for archiving or storing video footage only. Alpha channels are not supported. DV NTSC and DV PAL-DV NTSC and DV PAL are designed for video created with today's inexpensive yet high-quality digital camcorders. The compression and data rate are fixed at 3.6 MB per second. Graphics-Uses a similar compression algorithm to Animation, but only supports up to 8-bit color or grayscale (256 shades of color/gray). This codec typically compresses better than Animation (smaller file size), but takes more time to decompress the data than QuickTime. Alpha channels are not supported. H.261-H.261 is a standard video-conferencing codec. It is designed for low data rates and relatively low motion. H.261 was used as a starting point for the development of MPEG (which is optimized for higher data rates). H.263-H.263 is a standard video-conferencing codec. It is optimized for low data rates and relatively low motion. H.263 is an advancement of the H.261 and MPEG-1 standards, designed with the goal of producing substantially better quality below 64 791
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