White paper
Sony Ericsson P1
31
May 2007
Video formats
DLS
The DLS file format is used to store both the digital sound data and articulation
parameters needed to create one or more 'instruments.' An instrument contains
'regions' which point to WAVE 'files' (samples) also embedded in the DLS file. Each
region specifies a MIDI note and velocity range which will trigger the corresponding
sound and also contains articulation information such as envelopes and loop points.
Articulation information can be specified for each individual region or for the entire
instrument.”
Real Audio 9
RealAudio is a proprietary encoding format from RealNetworks. It also supports
repositioning during real-time playback.
eAAC+
(eAAC+, AAC+
V2)
eAAC+ is AAC+ with the addition of Parametric Stereo (PS). PS significantly increases
the codec efficiency for low bit rate stereo signals.
AAC+
(HE AAC, AAC+)
‘High-efficiency AAC’ is the official MPEG name for the combination of AAC and
Spectral Band Replication (SBR). SBR is a bandwidth extension technique enabling
audio codecs to deliver the same quality at half the bit rate.
Format
Description
MPEG-4 ISO File Format (.mp4), ISO/
IEC 14496-14, including:
• MPEG-4
• AAC-LC, AMR-NB (audio)
File formats that are specified as a part of the ISO/IEC MPEG-
4 international standard. It is used to store media types
defined by the ISO/IEC Moving Picture Experts Group, and
can be used to store other media types as well. It is, typically
used to store data in files, though it will be used in data
streams and possibly in other ways. The .mp4 allows
multiplexing of multiple video and audio streams in one file,
variable frame- and bit-rates, subtitles and still images. It also
allows streaming over the Internet.
3GPP File Format (.3gp), 3GPP TS
26.234 V5.6.0, including:
• MPEG-4, H.263, H.264 (video)
• AAC-LC, AMR-NB (audio)
File formats which are used in mobile phones to store media
(audio/video). This file format is a simpler version of "ISO
14496-1 Media Format”. This format can only carry video
encoded as MPEG-4, H.263, or H.264. Audio is stored in AAC-
LC or AMR-NB formats.
RealMedia
A digital sound and video file format that is the registered
trademark of RealNetworks. This format is typically used to
stream media through the net.
Windows Media Video, WMV
A generic name for the set of video codec technologies
developed by Microsoft. It is part of the Microsoft Windows
Media framework.
