Abstract: Provided are a method and device for transmitting/receiving media content via internet. The method includes: configuring the media content with a plurality of representations; dividing the configured representation into a plurality segments; aligning subsegments in the segment; and transmitting one of the representations, wherein the subsegments are aligned to allow the earliest presentation time of the kth subsegment in the first representation to be greater than the latest presentation time of the k?1th subsegment in the second representation among the representations.

Abstract: Methods and apparatuses for transmitting/receiving a media transport stream by using an internet protocol (IP) based transport system are provided. The transmitting method includes removing some data from media transport stream to be transmitted; configuring at least one entry box including information for reinserting the removed data into the media transport stream; configuring a media data (mdat) box including the media transport stream from which the data has been removed; and positioning and transporting a compression information box including the at least one entry box before the mdat box.

Abstract: A method and apparatus for transmitting and receiving an MPEG-2 TS-based media file are provided. In the method of transmitting an MPEG2 Transport Stream (TS)-based media file, a Presentation Time Stamp (PTS) of a Presentation Unit (PU) is mapped to a Media Presentation Time (MPT) for synchronization with other media with respect to at least one program element forming a program included in the media file; and synchronization information including the mapped media presentation time is transmitted together with the media file, wherein the media presentation time is provided for a first PU in a segment of the transmitted media file.