MP4 MPEG-4 Part 14 or MP4 is a digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet. TS TS stands for Transport Stream TS files are specified for MPEG-2 part 1 systems MPEG transport stream (transport stream, MPEG-TS, MTS or TS) is a standard digital container format for transmission and storage of audio, video, and Program and System Information Protocol (PSIP) data.[3] It is used in broadcast systems such as DVB, ATSC and IPTV. The video quality of MP4 and TS files are the same. The primary difference between TS and MP4 files is that TS files are flat while MP4 files have an index at the beginning of the MP4 file. Otherwise, the video bits inside the files are the same and therefore the video quality of TS, M2TS and MP4 files are the same. Sources: wikipedia_mp4 wikipedia_ts digitalfaq ...