Files in which the rate of bit transmission is non-constant
Variable bitrate (VBR) is a term used in telecommunications and computing that relates to the bitrate used in sound or video encoding. As opposed to constant bitrate (CBR), VBR files vary the amount of output data per time segment. VBR allows a higher bitrate (and therefore more storage space) to be allocated to the more complex segments of media files while less space is allocated to less complex segments. The average of these rates can be calculated to produce an average bitrate for the file.
MP3, WMA and AAC audio files can optionally be encoded in VBR, while Opus and Vorbis are encoded in VBR by default.[1][2][3] Variable bit rate encoding is also commonly used on MPEG-2 video, MPEG-4 Part 2 video (Xvid, DivX, etc.), MPEG-4 Part 10/H.264 video, Theora, Dirac and other video compression formats.[citation needed] Additionally, variable rate encoding is inherent in lossless compression schemes such as FLAC and Apple Lossless.[citation needed]
^Variable Bitrate(knowledgebase), Hydrogenaudio, 2007, archived from the original on 2014-07-06, retrieved 2009-09-30
^"VBR", Glossary, AfterDawn, archived from the original on 2010-01-28, retrieved 2009-09-30
^Variable bit rate(wiki), Audacity, archived from the original on 2009-09-08, retrieved 2009-09-30
Variablebitrate (VBR) is a term used in telecommunications and computing that relates to the bitrate used in sound or video encoding. As opposed to constant...
Constant bitrate (CBR) is a term used in telecommunications, relating to the quality of service. Compare with variablebitrate. When referring to codecs...
Average bitrate can also refer to a form of variablebitrate (VBR) encoding in which the encoder will try to reach a target average bitrate or file size...
In telecommunications and computing, bit rate (bitrate or as a variable R) is the number of bits that are conveyed or processed per unit of time. The bit...
RealMedia VariableBitrate (RMVB) is a variablebitrate extension of the RealMedia multimedia digital container format developed by RealNetworks. As opposed...
streams are in CBR (constant bitrate), but a container for VBR (variablebitrate) streams named RMVB (RealMedia variablebitrate) has been developed. A RealMedia...
a bitrate control mechanism that is responsible for determining the bitrate and quality on a per-frame basis. A difference between variablebitrate (VBR)...
compression artifacts while staying within the bitrate limits. DSC can work in constant or variablebitrate mode. The minimum allowed bits-per-pixel (BPP)...
RealVideo RealAudio Made for RealPlayer RealMedia VariableBitrate (RMVB) .rmvb RealMedia VariableBitrate RealVideo RealAudio Made for RealPlayer VivoActive...
not anticipate this use. AVI cannot contain some specific types of variablebitrate (VBR) data reliably (such as MP3 audio at sample rates below 32 kHz)...
Smart Bitrate Control, commonly referred to as SBC, was a technique for achieving greatly improved video compression efficiency using the DivX 3.11 Alpha...
independents. All tracks were originally sold in 256 kilobits-per-second variablebitrate MP3 format without per-customer watermarking or DRM; however, some...
chroma subsampling Up to 12-bit sample depth I frame-only encoding Variablebitrate (VBR) encoding Normal 147 Mbit/s and High-Quality 220 Mbit/s and ProRes...
Resource Interchange File Format RM, RV, RMVB - Real Media/Video (VariableBitrate) RSRC - Mac OS Resource RTF - Rich Text Format RW2 - Panasonic Raw...
psychoacoustic model (GPSYCHO) is released. June 1999 (LAME 3.11): The first variablebitrate (VBR) implementation is released. Soon after this, LAME also became...
MP3 format audio files, and has support for a variety of bitrates, including MP3 variable-bitrate (VBR) support. It shipped with 32 MB of internal memory...
bursts may be seen as a desirable feature,[citation needed] e.g. in variablebitrate transmissions. Video or image jitter occurs when the horizontal lines...
Audio Video Interleave (.avi) Windows Media Video (.wmv) RealMedia VariableBitrate (.rmvb) VOB (Video Object) (DVD file) (.vob) QuickTime File Format...
containers. .aax Audible (Amazon) An Audiobook format, which is a variable-bitrate (allowing high quality) M4B file encrypted with DRM. MPB contains AAC...
cells with no special format AAL1 – Constant bitrate, circuit emulation (T1, E1, etc.) AAL2 – Variablebitrate synchronous traffic, eous traffic, e.g. Frame...
to improve appearance on flat-panel televisions, and "statistical variablebitrate" to optimize streaming performance. On February 24, 2009, Vudu became...
at 192 kHz. The maximum bitrate of an audio stream including metadata is 18 Mbit/s (instantaneous, since it is variablebitrate), and a TrueHD frame is...
subunit a1, a human gene The highest standard quality setting for variable-bitrate (VBR) MP3 files A classification under the UL 94 plastics flammability...
March 2009. iTunes offers a "Variable Bit Rate" encoding option which encodes AAC tracks in the Constrained VariableBitrate scheme (a less strict variant...
(and the smallest file size, accordingly). This method produces a variablebitrate because it tracks the variations of the BPP. Standard film stocks typically...
importance sampling Auxiliary field Monte Carlo Rejection sampling Variablebitrate — a common audio application of importance sampling Kloek, T.; van...
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