Another threat to the sales of DVDs are the rise of online streaming services such as Netflix which allow a user instant access to video with similar or superior picture quality. DVD is slowly being overtaken by Blu-Ray which provides a further improvement in terms of quality. They quickly overtook VHS to become the most popular format for the distribution of video due to their durability (approximately 100 years) and the superior quality of the image. Released in 1995, DVD is a removable storage device. Detailed information on the MP4 File Format.The only official filename extension for MPEG-4 Part 14 files is. A separate hint track is used to include streaming information in the file. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. MPEG-4 Part 14 or MP4, formally ISO/IEC 14496-14:2003, is a multimedia container format standard specified as a part of MPEG-4.

Since stores like iTunes uses this container format, and it is used with iPod and PlayStation Portable (PSP), MP4 files have become more common. MP4 is a container format that can store video, audio and subtitle data (as well as more depending on content). MP4 files (MPEG-4 Part 14) are multimedia files.

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