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MPEG-4 was opened by MPEG (MovingPictureExportsGroup)
in 1999 as the first edition and was formally declared to be
the international standard in the early 2000. It differs
greatly from both MPEG-1 and MPEG-2. MPEG-4 content-based
multimedia data access tools and editing functions for the
operation and bit-stream of contents so that users could
alternatively get the relative items on interactive home
shopping. With the perfect technology of first-generation
video encoding as the core technology and other key
technologies like video object segmentation, Video Object
encoding, scalability, motion estimation and compensation,
it becomes widely and safely applied in internet. MKV is a common video file defined by
Matroska Media, a new multimedia package format. The feature
of MKV is that it could hold many types of encoded video,
audio and subtitles stream.
To convert mpeg4 to mkv file: The
containers such as mp4, mov, avi, rm, mkv, ogm divx supports
mpeg-4 stream. please install the appropriate video filter
and audio filter for the mpeg4 format such as
FFDshow, divx, xvid, HDX4 codec, or MainConcept decoder.
Download
MKV Converter which can
convert mpeg4 to mkv file. Then please install
MKV
codecs. Select a mpeg4 file, set some parameters such as
DivX or
XviD as
the video compressor, Microsoft ADPCM as the audio
compressor, adjust the resolution, frame rate etc if
necessary.
H.261 is the first practical digital
video coding standard designed by ITU-T to develop
conference TV and video telephony on ISDN. It becomes the
design framework of later International Standard of Video
Coding including MPEG-1, MPEG-2/H.262 and H.263. H.261. It
only deals with CIF and QCIF image formats by dividing every
frame into images layer, Acer block group layer, Acer block
and block layer. H.261 output rate is constant, while the
image quality is unsteady.
H.263 is the standard draft of ITU-T
designed for low bit-stream communications. Actually the
standard could be used in broader bitstream scope but not
limit to low bit-stream. What痴 more, it痴 thought to be
used to replace H.261.The coding algorithm of H.263 is the
same with that of H.261.but there池e still some differences.
e.g. H.263 adopts semi-precision for motion compensation
while H.261 adopts all pixel accuracy and filtering cycle;
H.263 contains four consultable options to improve
performance.
After install H.261 or H.263 decoder,
mkv converter can convert h.261/h.263 to mkv file. |
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