The MOD file format was developed by Panasonic and JVC for camcorders that record onto a hard disk or SD memory card rather than tape. MOD continues to be the format of choice for a number of camcorder manufacturers. The file type is very similar to MPEG2 format. MOD files are capable of containing both standard definition and high definition video, however a number of manufacturers use the TOD file format instead as this allows for full 1080i high definition.
A .mod file supports a maximum resolution of 720 x 480 and a video signal of 480i or 576i. The supported frame aspect ratios are 4:3 or 16:9, however in some situations decoders fail to detect the correct aspect and display in 4:3. A separate file is created along with the MOD file called an MOI file. This records metadata relating to the recording such as date, time etc. This format should not be confused with the MOD sound file format, developed for use in the 1980s for early Amiga consoles.
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MP4 files (MPEG-4 Part 14) are multimedia files. MP4 is a container format that can store video, audio and subtitle data (as well as more depending on content). Since stores like iTunes uses this container format, and it is used with iPod and PlayStation Portable (PSP), MP4 files have become more common.
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. 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. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. A separate hint track is used to include streaming information in the file. The only official filename extension for MPEG-4 Part 14 files is .mp4.
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