Multimedia Glossary

3GP, 3GPP 3ivx AAC AC3 APE ASF AVI Bitrate

Attention: Aimersoft DVD Ripper and Aimersoft DVD Ripper for Mac can help you rip DVD to all common video and audio formats. Aimersoft Video Converter and Aimersoft Video Converter for Mac can finish the conversion among all common video and audio formats.

3GP,3GPP – The mpeg4 based video format used in mobile terminals, like cell phones. Related software: DVD to 3GP Converter, 3GP Video Converter.

3ivx – An MPEG-4 toolkit that supports MPEG-4 Video, MPEG-4 Audio and the MP4 File Format.

AAC – Stands for Advanced Audio Coder. An audio-encoding standard for MPEG-2 that is not backward-compatible with MPEG-1 audio. Related software: Audio Converter

AC3 – is the audio format utilized by ATSC and DigiCipher II. Related software: Audio Converter

APE – A file with the extension .ape, is an audio file compressed using Monkey’s Audio. Monkey’s Audio is a lossless compression, which means it does not permanently discard data during compression. It achieves compression rates of around 40%. Since it is lossless, the quality of the audio after compression will be the exact same. Related software: Audio Converter

ASF –  Stands for Advanced Streaming Format. stores audio and video information, and it is specially designed to run on networks like the Internet. ASF is a highly flexible and compressed format that contains streaming audio, video, slide shows, and synchronized events. When you use ASF files, content is delivered to you as a continuous flow of data. When an AVI file is compressed and converted to an ASF file, the file begins playing after only a few seconds. Related software: Video Converter

AVI – Stands for Audio Video Interleaved, storing sound and moving pictures in RIFF format developed by Microsoft. An AVI file can use different codecs and formats so there is no set format for an AVI file unlike for example standard VCD video which sets a standard for resolution, bitrates, and codecs used. Related software: DVD to AVI Converter, AVI MPEG Converter

Bitrate – Bitrate or Bit Rate is the average number of bits that one second of video or audio data will consume. Higher bitrate means bigger file size and generally better video or audio quality while lower bitrate means lower file size but worse video or audio quality. Some bitrate examples in common video and audio files:
MP3 about 128 kbps (kilobits per second)
VCD about 1374 kbps
DVD about 4500 kbps
DV about 25 Mbps (megabits per second).

Blueray – A Blu-ray Disc (BD) is a next-generation optical disc format designed for high-density storage of high-definition video and data. Related software: Blu-ray Ripper

CSS – Content Scrambling System. In DVD-Video, an encryption scheme designed to protect copyrighted material that resides on a disc by periodically scrambling the data using encryption keys. Related software: CSS Ripper

DAT – DAT is used to refer to a certain tape backup format. But in audio/video terminology it normally refers to files that VideoCD has in its SEGMENT or MPEGAV directories. These DAT files are basically MPEG-1 files with an additional information and certain specific file structure — they are NOT “real” MPEG-1 files and you need to convert them back to “real” MPEG-1 files in order to edit them even that most of the software players treat them as regular MPEG-1 files. Related software: DAT Video Converter

DivX – a new format for digital video, much like MP3 is a format for digital music. DivX is the brand name of a patent-pending video compression technology created by DivX Networks, Inc., The DivX codec is based on the MPEG-4 compression standard. This codec is so advanced that it can reduce an MPEG-2 video (the same format used for DVD or Pay-Per-View) to ten percent of its original size. Related software: DivX Converter

DVD– DVD once stood for Digital Video Disc or Digital Versatile Disc, but now it just stands for DVD — the next generation of optical disc storage technology. DVD is essentially a bigger, faster CD that can hold cinema-like video, better-than-CD audio, and computer data. Related software: DVD Converter

DVD-R – DVD+Recordable define a standard for recordable DVD drives and media defined by the DVDRW Alliance. Often called “plus R”, the format is writing once (compared to DVD+RW which can be erased and rewritten). The single sided discs can hold 4,700,000,000 bytes (4.38 Gigabytes at 1024 bytes to the kilobyte) with double sided discs holding twice as much. There are no dual layer single sided recordable discs. This format competes with the DVD Forum DVD-R specification. DVDRhelp DVDR information. Related software: DVD Creator, DVD Copy for Mac

DVD – RW – DVD-RW is a Rewriteable media format of the DVD-R standard. Related software: DVD Creator, DVD Copy for Mac

FLV – SWF is not the only Flash format. FLV files (Flash Video Files) are a binary file format that delivers “bitmapped” video, limited to one video and one audio stream per file, over the Internet to the Macromedia Flash Player version 7. FLV content may also be associated with SWF files by ActionScript external references. FLV format can also imported into Macromedia Flash Authoring tool. Unlike SWF format, FLV do not have maximum of 16000 frames limitation and ideally for large video file size. Related software: FLV Converter

Framerate – Frames per second. A measure of the rate at which pictures are shown for a motion video image. In NTSC and PAL video, each frame is made up of two interlaced fields.

H.264 – H.264 is known as MPEG4 AVC, The standard is expected to offer up to twice the compression of the current MPEG4 ASP (Advanced Simple Profile), in addition to improvements in perceptual quality. The H.264 standard can provide DVD-quality video at under 1 Mbps, and is considered promising for full-motion video over wireless, satellite, and ADSL Internet connections. Related software: DVD to H.264 Converter, H.264 Video Converter

HD-DVD – HD DVD (High Density DVD or High Definition DVD) is a next-generation optical disc format designed for high-density storage of high-definition video and data. Related software: HD-DVD Converter

HDTV – High Definition TV is high-resolution digital television combined with Dolby Digital surround sound (AC-3). HDTV is the highest DTV resolution in the new set of standards. This combination creates a stunning image with stunning sound. HDTV requires new production and transmission equipment at the HDTV stations, as well as new television equipment for reception by the consumer. The higher resolution picture is the main selling point for HDTV. Imagine 720 or 1080 lines of resolution compared to the 525 lines people are used to in the United States (or the 625 lines in Europe) — it’s a huge difference!
Of the 18 DTV formats, six are HDTV formats, five of which are based on progressive scanning and one on interlaced scanning. Of the remaining formats, eight are SDTV (four wide-screen formats with 16:9 aspect ratios, and four conventional formats with 4:3 aspect ratios), and the remaining four are video graphics array (VGA) formats. Stations are free to choose which formats to broadcast.
The formats used in HDTV are:
720p – 1280×720 pixels progressive
1080i – 1920×1080 pixels interlaced
1080p – 1920×1080 pixels progressive

IFO – is a DVD information file that stores information about Chapters, Subtitles and Audio Tracks. Other DVD files include VOB and BUP files. IFO normally refers to a file on DVD-Video disc and stands for InFOrmation. While the main content of DVD-Video disc are the VOB files which contain the actual MPEG2 audio, video and subtitle streams, the IFO files provide information for DVD player where DVD-Video disc’s chapters start, where certain audio tracks are located, etc. Related softare: IFO Converter, IFO Ripper for Mac

ISO – Besides the standards organization, this is a CD/DVD image format somewhat similar to a BIN/CUE image fileset, but the one single .ISO file contains both: the data and the CD/DVD layout information. These types of images can be burned with several CD /DVD burning programs. Related software: ISO Burner, ISO to DVD Burner for Mac

M4A – The audio file format used by Apple in their popular iTunes Music Store often appears on your system with the “.M4A” filename extension. M4A can produce better audio quality than MP3 using less physical space for the files. Related software: M4A Audio Converter

MOV – QuickTime Content (.mov, .qt) a file format developed by Apple Computer to create, edit, publish, and view multimedia files. QuickTime supports video, animation, graphics, 3D and virtual reality (VR). Related software: Mov Converter

MP3 – is an acronym for MPEG-1 (or MPEG-2) Layer 3 audio encoding (it is not an acronym for MPEG-3). MP3 is a popular compression format used for audio files on computers and portable devices. Related software: Audio Converter

MP4 – is a new container format, a container format allows you to combine different multimedia streams into one single file. Multimedia containers are for example the well known AVI, MPEG , Matroska, OGM. MP4 is the global file extension for the official container format defined in the MPEG-4 standard. MP4 is streamable and supports all kinds of multimedia content, multiple audio-, video-, subtitlestreams, pictures, variable-framerates, -bitrates, -samplerates…) and advanced content like 2D and 3D animated graphics, user interactivity, DVD-like menus. Related software: DVD to MP4 Converter, MP4 Video Converter

MPEG – An ISO/ITU standard for compressing video offering lossy compression technique (some data of the original image is lost during the compression). Related software: MPEG Converter, Video Converter for Mac

MPG – MPEG-1 or MPEG-2 -encoded video file. Related software: MPEG Converter, Video Converter for Mac

NTSC – Abbreviation of National Television Standards Committee. The NTSC is responsible for setting television and video standards in the United States (in Europe and other parts of the world, the dominant television standards are PAL and SECAM). The NTSC standard for television defines a composite video signal with a refresh rate of 60 fields (half-frames interlaced) per second. Each frame contains 525 lines and can contain 16 million different colors. The resolution of an NTSC VCD is 352×240 pixels, an NTSC SVCD is 480×480, and an NTSC full D1 DVD is 704 or 720 x 480.

PAL – Short for Phase Alternating Line, the dominant television standard in Europe. The United States uses a different standard, NTSC. PAL delivers 625 lines at 50 fields (half-frames interlaced) per second. The resolution of a PAL VCD is 352×288 pixels, a PAL SVCD is 480×576, and a PAL full D1 DVD is 704 or 720 x 576.

OGG – OGG Theora is the video compression codec part of the ogg multimedia project. It is based on On2’s VP3 codec, but On2 has released it now under a BSD type license and renounced its patents, so it is now free and open source. A final release is due out in early summer 2003.
Ogg is the name of an open source multimedia project maintained by the foundation. OGG Vorbis refers to the lessee general purpose audio compression format that surpasses mp3 in quality and rivals new formats such as AAC and TwinVQ (a.k.a. VQF). http://www.xiph.org Related software: Audio Converter

RM RM stands for Real Media. Real Media is one of the most popular formats for streaming content on the Internet, RealMedia includes the RealAudio codec for sound clips and RealVideo codec for movies. RealAudio and RealVideo files are often given the common RealMedia “.RM” file extension. RealMedia files are often heavily compressed so they can stream over dial-up Internet connections. Related software DVD to RM Converter, RM Video Converter.

S-VHS – S-VHS, which stands for Super VHS, is an analog consumer videotape format developed by JVC and introduced in 1987 as a successor to the popular VHS (Video Home System) format. S-VHS offers two distinct advantages over VHS. Use of a higher quality tape provides a higher bandwidth, resulting in more detail preserved on each TV scanline. In addition, the use of S-Video (instead of composite video) to connect a S-VHS deck to a TV results in the native luminance / chrominance separation in both S-VHS and standard VHS being preserved, which also improves the image on your TV.

VHS – VHS an analog format capable of delivering 240 lines of video resolution, along with stereo sound that’s nearly as good as CD (in dynamic range and frequency response). Blank tapes usually feature either 120 minutes or 160 minutes of recording time at the highest recording speed (6 hours or 8 hours at the slowest speed). VHS and VCR’s are slowly being phased out in favor of DVD players and other digital tape media.

Videotape – Videotape is any magnetic tape recording system that records video. While most people think of videotape in terms of the analog (VHS, BetaMax, Video8, etc,…) formats popular through the late 1990s. However, videotape can also be used to store digital video, including consumer formats like DV and D-VHS.
Videotape is also used extensively for professional digital video applications from news gathering to archival storage, although to some extent it’s been replaced by hard drive and optical disc (DVD) storage. This is even more true in the consumer market where miniDV camcorders have largely been replaced by models which write to a hard drive or directly to a miniDVD.

VOB – All DVD movies are stored in on a DVD video disc in so-called VOB files. VOB files usually contain multiplexed Dolby Digital audio and MPEG-2 video. VOB files on a DVD are numbered as follows: vts_XX_y.vob where XX represents the title and Y the part of the title. There can be 99 titles and 10 parts, although vts_XX_0.vob does not contain any video, usually just menu or navigational information. You can find them on a DVD video disc in a subdirectory labelled VIDEO_TS (all upper case). Related Software: DVD to VOB Ripper, VOB Video Converter

WAV – WAV files are probably the simplest of the common formats for storing audio samples. UnlikeMPEG audio and other compressed formats, WAVs store samples “in the raw” where no pre-processing is required other that formatting of the data. The WAV file itself consists of three “chunks” of information: The RIFF chunk which identifies the file as a WAV file, The FORMAT chunk which identifies parameters such as sample rate and the DATA chunk which contains the actual data (samples) Related software: WAV Audio Converter

WMA – Windows Media Audio. Related software: WMA Audio Converter

WMV – Windows Media file with Audio and/or Video (WMV): You can use a WMV file either to download and play files or to stream content. The WMV file format is similar to the ASF file format. Related Software: DVD to WMV Ripper, WMV Video Converter

XviD – is an ISO MPEG-4 compliant video codec. It’s not a product but an open source project which is developed and maintained by people around the world. Related Software: DVD to XviD Ripper, XviD Video Converter

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