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Recording video and audio to a digital format involves
balancing quality with file size and data rate. Most formats use
compression to reduce file size and data rate by selectively reducing
quality. Without compression, a single frame of standard-definition
video takes up nearly 1 MB (megabyte) of storage. At the NTSC frame rate
of approximately 30 frames per second, uncompressed video plays
at nearly 30 MB per second. 45 seconds of footage takes up about
1 GB of storage. By comparison, an NTSC file compressed in DV format
fits 5 min. of footage into 1 GB of storage at a data rate of about
3.6 MB per second. To compress video at the highest possible quality,
consider the constraints of your target delivery media and playback
devices. Select the smallest compression ratio that generates files within
their file size and data rate limits.
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