Comprehensive Overview of Multimedia Formats (File Extensions for Photos, Videos, and Audio)

For anyone planning to step into the wonderful world of camcorders, I always hope they understand not only the device’s technical specifications, but also what kind of files the camcorder actually produces.

Certain camcorder manufacturers frequently adopt proprietary multimedia formats. On one hand, they believe their in-house format is superior; on the other hand, by restricting users to their proprietary video editing software, they can monetize the software ecosystem.

Proprietary multimedia formats bring complications that extend far beyond simply producing a file and editing it with designated software.

When you want to watch the footage, you may find that media players refuse to play the format; when you want to burn video discs, you may even have to convert files first.

For many computer newcomers, dealing with these format issues can easily become an impossible mission.

I experienced this exact predicament in the past. In my article Purchasing Experience of SONY Digital Camcorders, I mentioned purchasing a new Sony camcorder.

The multimedia container Sony used to record and store video on the media was a specialized format called “M2TS”—something I had never encountered across decades of computing experience before purchasing that camcorder.

Therefore, I have compiled a list of common multimedia formats, their file extensions, and their meanings below to help everyone gain a clear understanding before buying a camcorder, so you won’t end up shooting videos without knowing how to process them.

The following formats are categorized into three major types: video and animation, audio, and static images:

Video and Animation Formats

Currently, the most important and complex multimedia formats in video include MPEG-1, MPEG-2, and MPEG-4, alongside numerous derivatives such as MPEG, MPE, MPG, M2V, MPA, MP2, M2A, MPV, M2P, M2T, MTS, AC3, MP4, M4V, M4A, VOB, 3GP, AVC, and H.264.

Because the industry recognized that format fragmentation causes user friction, modern devices have widely standardized around MPEG-4 encoding (MP4). This achieves higher data density within limited storage and allows dedicated hardware codec circuits to accelerate encoding and decoding operations.

Other common video and animation file extensions include:

• 3G2
• AVI: Early AVI was developed by Microsoft, standing for Audio Video Interleave, which multiplexes video and audio streams together. AVI is among the longest-surviving formats with over a decade of history. Although revised (V2.0 released in 1996), it shows its age. AVI has strict structural limitations, traditionally allowing only one video track and one audio track (non-standard plugins now allow up to two audio tracks) plus subtitle or text tracks, without advanced playback controls.
• DV: Digital Video streams stored within MOV or AVI containers, or raw containerless DV streams.
• FLV/F4V: FLV and F4V are container formats associated with distinct video and audio streams. F4V files typically contain video encoded with H.264 and audio encoded with AAC. FLV files usually wrap On2 VP6 or Sorenson Spark video with MP3 audio. Adobe Media Encoder CS5 can import certain FLV files encoded with On2 VP6, but cannot ingest Sorenson Spark FLV streams.
• GIF: Animated image format.
• MKV: Matroska is an open-source container format capable of packaging multiple video streams with 16 or more audio and subtitle tracks in different languages into a single Matroska file. It also provides rich interactivity far surpassing standard MPEG containers.
• MOD: Hard disk camcorder recording format utilized by JVC.
• MOV: QuickTime Movie is a container developed by Apple. Owing to Apple’s dominance in professional graphic arts, QuickTime became a standard across the film industry. On February 11, 1998, ISO recognized QuickTime as the foundational specification for MPEG-4. QuickTime holds rich content including video, audio, still images, and text subtitles.
• MPG/MPEG: Developed by the Moving Picture Experts Group and recognized by ISO, widely supported across playback hardware. It adapts to diverse storage environments. MPEG-4 containers are defined across Part 1 (mux), 14 (asp), and 15 (avc). MPEG supports multiple video angles, audio tracks, and bitmap subtitles. A simplified variant, 3GP, was widely deployed on 3G handsets. Associated extensions include .dat (for VCD), .vob, .mpg/.mpeg, and .3gp/.3g2.
• MTS/M2TS: Audio Video Coding High Definition. Panasonic and Sony jointly introduced the “AVCHD” format in May 2006, utilizing H.264 for video and 5.1-channel AC3 or 7.1-channel LPCM for audio, encapsulated inside an MPEG-2 Transport Stream (M2TS) bitstream.
• MXF: Material eXchange Format. Adobe Media Encoder can ingest select MXF streams. Using DV, DVCPRO, DVCPRO50, DVCPRO HD, and AVC-Intra codecs, it can record to Panasonic P2 media, enabling Panasonic Op-Atom format compatibility, as well as ingesting XDCAM HD MXF files.
• R3D: RED Raw video format.
• RM/RMVB: RealVideo or RealMedia (RM) containers created by RealNetworks. Typically designed to encapsulate RealVideo and RealAudio. It features interactive scripting controls. The variable-bitrate variant, RMVB, featured compact file sizes and enjoyed widespread popularity in early online downloading.
• OGG: Ogg Media is an open-source multimedia initiative; OGM (Ogg Media File) serves as its container, supporting multiple video, audio, and subtitle streams.
• WAV: Video for Windows audio/multimedia container variants.
• WMA/ASF/WMVHD: Microsoft’s suite of digital video codecs, using Advanced Systems Format (ASF) as its container. ASF-packaged WMV files often include digital rights management (DRM) capabilities.

Sound (Audio) Formats

Common audio and music file formats include:

• AAC/M4A: Advanced Audio Coding.
• AIF/AIFF: Audio Interchange File Format.
• ASND: Multi-track audio merged into single tracks (Adobe Sound Document).
• AVI/WAV: Audio streams within Video for Windows wrappers.
• MOV: QuickTime Audio tracks.
• MP3/MPG/MPEG/MPA/MPE.
• WAV: Waveform audio format.
• WMA: Windows Media Audio.

Still Image Formats

Static graphic formats encountered most frequently in digital cameras and visual design:

• AI: Adobe Illustrator vector graphics format.
• BMP: Bitmap image.
• CDR: CorelDRAW vector graphic format.
• CIN/DPX: Digital cinema raster graphic formats.
• GIF: Graphics Interchange Format.
• ICO: Icon format.
• JPG/JPEG: Lossy compressed graphic format, dominant in digital camera storage.
• PIC/PCT: Picture image format.
• PNG: Portable Network Graphics, lossless compression with transparency support.
• RAW: Camera sensor raw image format preserving uncompressed sensor and Bayer filter color data.
• TGA: Truevision Targa graphic format.
• TIF/TIFF: Tagged Image File Format.

Extensive documentation for each of these formats exists across the web; this summary serves as a practical guide so users understand how to manage and utilize these files effectively.

Beyond casual users who only need straightforward playback, others need formats for offline video editing, burning optical discs, or sharing content online.

While this proliferation of formats appears diverse, it frequently creates unnecessary friction and redundancy in computing, largely driven by vendor competition and proprietary lock-in.

Using Sony hard disk camcorders as an example, Sony provides the “PMB” (Picture Motion Browser) management software, featuring integrated transcode and disc-burning capabilities.

Ultimately, every file format experiences its peak and decline. Computing technology has evolved over barely five or six decades; bounded by binary representations, underlying formats share foundational technological lineages regardless of how new or old their wrappers appear.