File format features
Nero Digital
™
CDs
Nero Digital™ is the ideal solution for video and audio codecs.
Codecs are required for processing and playing audio and video
files.
The Nero Digital™ codec allows you to save all the audio and
video material on a DVD on a normal data CD with no percepti-
ble loss in quality.
The audio and video codecs of Nero Digital™ are based entirely
on the industry standard MPEG-4 Video ISO 14496-2 and MPEG-
4 Audio High Efficiency AAC and Parametric Stereo AAC.
Nero Digital files have the suffix .MP4.
Nero Digital™ files can contain a video track, up to 8 audio tracks
and up to 32 overlay tracks (e.g. subtitles).
To create Nero Digital™ files you need the “Nero Recode” or
“Nero Vision Express” software. You can find more information on
Nero Digital™ at www.nerodigital.com.
MP4 video CDs
An MP4 video is an encoder/decoder, based on the MPEG-4 com-
pression system, which is used to decrypt and display compressed
video data.
This enables the DVD player to play back videos compressed in the
DivX© format. This results in playback quality with fewer artefacts
and higher compression.
MP4 video files have the suffix .AVI. MP4 video data is packed
into the AVI file along with audio data which is compressed as
MP3 data, this means:
MP4 video and MP3 audio form the AVI file.
MP3 CDs
MP3 stands for MPEG-1 Audio Layer 3 and comes from the Mo-
tion Picture Expert Group (MPEG) standard, which was developed
for compressing film data.
The MP3 format enables audio files to be saved on a computer
with a sound quality similar to that of a CD. This only requires about
10% of the original data quantity. The standard encoding bit rate
for MP3 files is 128 kbps. Generally, the higher the bit rate of an
MP3 file, the better the sound quality.
Most MP3 files on the Internet are encoded at 128 or 160 kbps.
160 kbps is considered CD quality.
MP3 files can be downloaded from the Internet and then burned
onto a CD-ROM. Your DVD player can read the ID3 tag from the
file header, which contains information on the song and the artist,
and displays this in the info menu/status display.
PLAYING AUDIO/VIDEO FILES
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