MOD and TOD

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MOD and TOD are recording formats for use in digital tapeless camcorders. The formats are comparable to XDCAM EX, HDV and AVCHD.

Contents

Overview

MOD/TOD directory structure Mod tod file format.gif
MOD/TOD directory structure

MOD and TOD are informal names of tapeless video formats used by JVC (MOD and TOD), Panasonic (MOD only) and Canon (MOD only) in some models of digital camcorders. Format names correspond to extensions of video files. Neither JVC nor Panasonic, who pioneered the format, explained the meaning of the file extensions, and the formats were never given an official name. Some think that TOD stands for "Transport stream on disk". MOD is used exclusively for standard definition video files, while TOD is used for high definition files.

The first camcorders that used MOD format appeared in 2003. JVC introduced the Everio GZ-MG30, which recorded directly to an internal hard disk drive. Panasonic unveiled the SDR-S100, which recorded to SD cards. The encoding scheme, data rate, frame rate and frame size closely matched parameters of DVD-video.

In January 2007 JVC announced its first high definition tapeless consumer camcorder, the Everio GZ-HD7, which recorded 1080i MPEG-2 video to either a built-in hard disk drive or an SD memory card. Data rates, frame sizes and frame rate were comparable to 1080-line XDCAM and HDV video. [1] Panasonic has never released a consumer high definition camcorder that used TOD recording format. Instead, Panasonic joined Sony to develop AVCHD.

In January 2008 Canon unveiled a family of tapeless standard definition consumer camcorders: the FS100, FS10 and FS11. All these camcorders record in MOD format.

Both MOD and TOD are file-based formats that are stored on a random-access media. Directory structure and naming convention are identical except for extensions of media files. Each file has a sequential name with last three characters comprising a hexadecimal number, [2] which allows for 4096 unique file names.

Standard definition video is stored in MPEG program stream container files with MOD extension; in most other systems these files have extension MPG or MPEG. High definition video is stored in MPEG transport stream container files with TOD extension; in most other systems these files have M2T extension. [3]

Despite the file structure being unique to this video recording format, the location for still images follows the standard agreed upon by many still camera manufacturers. [4]

Standard definition video can be recorded in 4:3 and 16:9 formats. Some video decoders do not interpret the aspect ratio information in the media file header correctly, so 16:9 video may appear squeezed horizontally when viewed. [5] Software that is shipped with camcorders is capable of processing the aspect ratio information correctly, aided perhaps by the metadata stored in MOI files. There are also third-party tools for modifying the wide-screen aspect ratio information in the media file header so that it satisfies decoders which would otherwise fail to interpret this information correctly in an unmodified MOD file. [6] [7] [8] Some tools such as MediaInfo can correctly report the aspect ratio of widescreen MOD files, but media players may or may not display them correctly depending on the capabilities of the video decoder that they are utilizing at the time.

Conversion to widely accepted formats

MOD video can be viewed on a computer with a player that is capable of reproducing MPEG-2 video. This video can be easily authored for watching on a DVD player without recompression, because it is fully compliant with DVD-video standard.

TOD format is comparable with AVCHD, but cannot be directly played on consumer video equipment. Media files must be packaged into distribution formats like HD DVD or Blu-ray Disc, using authoring software. One of TOD recording modes, "1440CBR", has the same frame size, aspect ratio and frame rate as 1080i HDV, and can be loosely called "HDV on disk".

While many camcorders that produce the MOD and TOD formats also include Windows and/or Mac conversion software to run on your computer, there are other tools available for free to do the same work. Transport stream files can be converted into program stream files without recompressing the video itself. For example, FFmpeg, a free program, performs the conversion on Windows, Mac and Linux systems with the following command

$ ffmpeg -i myClip.TOD -vcodec copy -acodec copy myClip.mpg

A similar command is used for MOD files:

$ ffmpeg -f mpeg -i myClip.MOD -vcodec copy -acodec mp2 -ab 192k myClip.mpg

This is no longer necessary if the free and open source VLC media player is used, and, at least on Linux, the process is usually automated, such that connecting the camera to the PC via USB invokes the file manager and then the intuitive action of selecting a TOD file invokes VLC to play the file, or allows a simple copy and paste to transfer the file to the PC. VLC is also available for Windows.

Future of MOD and TOD formats

JVC was the only supporter of TOD format. In 2008 JVC released several hybrid TOD/AVCHD consumer models, and some AVCHD only models. Consumer high definition camcorders offered by JVC from 2009 onwards record only in AVCHD format. Professional JVC tapeless camcorders introduced in 2009 use XDCAM EX format, licensed from Sony. Like TOD, XDCAM EX employs MPEG-2 HD video encoding scheme. Unlike TOD, XDCAM EX uses MP4 container.

As of 2011, MOD format is still being used in standard definition camcorders manufactured by JVC, Panasonic and Canon. Sony employs MPEG-2 video encoding and Program Stream container in its standard definition camcorders too, but the directory structure is different from MOD, and the media files have conventional MPG extension.

MOD and TOD formats do not allow recording progressive-scan video, neither at "film" rates (24, 25, 30 frames/s) nor at "reality" rates (50, 60 frames/s). This limitation makes MOD and TOD formats suboptimal for online video viewing, because most video hosting websites stream progressive-scan video. On another hand, AVCHD allows recording progressive-scan high-definition video at both "film" and "reality" rates.

Products

JVC MOD camcorders

JVC TOD camcorders

Panasonic MOD camcorders

Canon MOD Camcorders

Specifications

Name of formatMODTOD
MediaHard disk drive, solid-state memory cards
Video
Video signal480i, 576i1080/60i, 1080/50i
Frame size in pixels720 x 480, 720 x 576, 704 x 480, 352 x 4801440 x 1080, 1920 x 1080
Frame aspect ratio4:3, 16:916:9
Video Compression MPEG2 Video (profile & level: MP@ML) MPEG2 Video (profile & level: MP@HL)
Chroma sampling format 4:2:0
Compressed video bitstream rate~3 - 10 Mbit/s depending on quality mode~17 - 30 Mbit/s depending on quality mode
Audio
Compression MPEG-1 Audio Layer II or Dolby Digital
System
Stream typeProgram streamTransport stream
Media file extensionMOD (on camcorder),

MPG or MPEG (on computer)

TOD (on camcorder),

M2T (on computer)

See also

Related Research Articles

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DV refers to a family of codecs and tape formats used for storing digital video, launched in 1995 by a consortium of video camera manufacturers led by Sony and Panasonic. In the late 1990s and early 2000s, DV was strongly associated with the transition from analog to digital desktop video production, and also with several enduring "prosumer" camera designs such as the Sony VX-1000. DV is sometimes referred to as MiniDV, which was the most popular tape format using a DV codec during this time.

Videotape Magnetic tape used for storing video and sound simultaneously

Videotape is magnetic tape used for storing video and usually sound in addition. Information stored can be in the form of either an analog signal or digital signal. Videotape is used in both video tape recorders (VTRs) or, more commonly, videocassette recorders (VCRs) and camcorders. Videotapes are also used for storing scientific or medical data, such as the data produced by an electrocardiogram.

SD card Type of memory storage for portable devices

Secure Digital, officially abbreviated as SD, is a proprietary non-volatile memory card format developed by the SD Association (SDA) for use in portable devices.

Camcorder Video camera with built-in video recorder

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HDV Magnetic tape-based HD videocassette format for camcorders

HDV is a format for recording of high-definition video on DV cassette tape. The format was originally developed by JVC and supported by Sony, Canon, and Sharp. The four companies formed the HDV Consortium in September 2003.

D-VHS Magnetic tape-based format meant for the distribution of digital HD movies

D-VHS is a digital video recording format developed by JVC, in collaboration with Hitachi, Matsushita, and Philips. The "D" in D-VHS originally stood for "Data", but JVC renamed the format as "Digital VHS". Released in 1998, It uses the same physical cassette format and recording mechanism as S-VHS, but requires higher-quality and more expensive tapes and is capable of recording and displaying both standard-definition and high-definition content. The content data format is in MPEG transport stream, the same data format used for most digital television applications. The format was introduced in 1998.

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XDCAM

XDCAM is a series of products for digital recording using random access solid-state memory media, introduced by Sony in 2003. Four different product lines – the XDCAM SD, XDCAM HD, XDCAM EX and XDCAM HD422 – differ in types of encoder used, frame size, container type and in recording media.

P2 (storage media) Memory card format

P2 is a professional digital recording solid-state memory storage media format introduced by Panasonic in 2004, and especially tailored to electronic news-gathering (ENG) applications. It features tapeless (non-linear) recording of DV, DVCPRO, DVCPRO25, DVCPRO50, DVCPRO-HD, or AVC-Intra streams on a solid-state flash memory. The P2 card is essentially a RAID of Secure Digital (SD) memory cards with an LSI controller tightly packaged in a die-cast PC Card enclosure, so data transfer rate increases as memory capacity increases. The system includes cameras, decks as drop-in replacements for videocassette recorders (VCR), and a special 5.25-inch computer drive for random-access integration with non-linear editing systems (NLE). The cards can also be used directly where a PC card (PCMCIA) slot is available, as in most older notebook computers, as a normal hard disk drive, although a custom software driver must first be loaded.

ProHD

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AVCHD is a file-based format for the digital recording and playback of high-definition video. It is H.264 and Dolby AC-3 packaged into the MPEG transport stream, with a set of constraints designed around the camcorders.

Sony produces professional, consumer, and prosumer camcorders.

The JVC GZ-MG555 camcorder, also known as the JVC GZ-MG575, was produced by JVC in 2007. It records standard definition MPEG-2 video onto either a built-in hard disk drive or on a secure digital memory card in MOD format.

M2TS is a filename extension used for the Blu-ray Disc Audio-Video (BDAV) MPEG-2 Transport Stream (M2TS) container file format. It is used for multiplexing audio, video and other streams. It is based on the MPEG-2 transport stream container. This container format is commonly used for high definition video on Blu-ray Disc and AVCHD.

The Apple Intermediate Codec is a high-quality 8-bit 4:2:0 video codec used mainly as a less processor-intensive way of working with long-GOP MPEG-2 footage such as HDV. It is recommended for use with all HD workflows in Final Cut Express, iMovie, and until Final Cut Pro version 5. The Apple Intermediate Codec abbreviated AIC is designed by Apple Inc. to be an intermediate format in an HDV and AVCHD workflow. It features high performance and quality, being less processor intensive to work with than other editing formats. Unlike native MPEG-2 based HDV - and similar to the standard-definition DV codec - the Apple Intermediate Codec does not use temporal compression, enabling every frame to be decoded immediately without decoding other frames. As a result of this, the Apple Intermediate Codec takes three to four times more space than HDV.

Panasonic Lumix DMC-GH1

The Panasonic Lumix DMC-GH1 is a digital mirrorless interchangeable lens camera adhering to the Olympus and Panasonic developed Micro Four Thirds System (MFT) system design standard. Panasonic classified the GH1 as a hybrid stills/video camera and the GH1 was introduced and marketed as a higher end camera than Panasonic's first MFT camera, the stills only, non-video capable Lumix DMC-G1.

Panasonic Lumix DMC-TZ10 Digital camera model

The Panasonic Lumix DMC-TZ10 is a compact "Travel Zoom" digital camera released in 2010. It is equipped with a 12x zoom lens, a GPS receiver for geotagging, has 12 Megapixels, and can film at up to 720p resolution at 30 frames per second in MJPEG and AVCHD formats. The camera can be connected to a USB port for file transfer and weighs 218 grams.

A 3D camcorder can record 3D video.

References

  1. "JVC GZ-HD7: World's First 1920x1080 MPEG-2 Camcorder".
  2. "JVC Everio/High Definition FAQ". Archived from the original on 2012-05-29.
  3. "Working with JVC Everio MOD and TOD files". Archived from the original on 2008-10-23. Retrieved 2008-08-25.
  4. "KODAK Digital Camera: Navigating to Your Pictures".
  5. "The MOD Video File Format".
  6. "New version of SDcopy.exe available".
  7. "Linux python script to work with mod files". Archived from the original on March 4, 2009.
  8. "Python script copying mod files to mpg with automatic aspect ratio correction".
  9. "Canon FS200 Compression & Media Summary". CamcorderInfo.com. Retrieved 6 July 2011.