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. Whatís more, itís thought to be used to replace H.261.The coding algorithm of H.263 is the same with that of H.261.but thereíre 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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