Every DVD video transfer is compressed at
a specific bit rate, which determines the quality – similar
to the EP and SP modes on a VCR. The higher the bit rate, the
higher the video quality, up to a maximum of 9.8 Mbps. A video
cassette transfer encoded above 6 Mbps will be indistinguishable
from the original tape after DVD video conversion.
Bit rates can be encoded at CBR (constant bit rate) or VBR (variable
bit rate). When VBR is used, high-motion segments are encoded
at a higher bitrate and low-motion segments are encoded at a
lower bitrate. VBR allows the maximum of quality to be applied
to each section of video, providing the best quality throughout.
(Timeless DVD only uses VBR video encoding when we convert video.)
Dolby Digital audio is the most widely-used format for encoding
the audio on a DVD. Dolby Digital delivers great sound and and
compresses raw audio very well, efficiently using the space on
the DVD disc. By compressing audio with Dolby Digital, a higher-quality
encode can be provided for the video.
DVD has had the fastest adoption rate of any consumer format
in history, and replaced the VHS video tape nearly 10 years ago.
See our Video Transfer to
DVD page for more information about DVD conversions.