In telecommunications, average bitrate (ABR) refers to the average amount of data transferred per unit of time, usually measured per second, commonly for digital music or video. An MP3 file, for example, that has an average bit rate of 128 kbit/s transfers, on average, 128,000 bits every second. It can have higher bitrate and lower bitrate parts, and the average bitrate for a certain timeframe is obtained by dividing the number of bits used during the timeframe by the number of seconds in the timeframe. Bitrate is not reliable as a standalone measure of audio or video quality, since more efficient compression methods use lower bitrates to encode material at a similar quality.
Average bitrate can also refer to a form of variable bitrate (VBR) encoding in which the encoder will try to reach a target average bitrate or file size while allowing the bitrate to vary between different parts of the audio or video. As it is a form of variable bitrate, this allows more complex portions of the material to use more bits and less complex areas to use fewer bits. However, bitrate will not vary as much as in variable bitrate encoding.[1] At a given bitrate, VBR is usually higher quality than ABR, which is higher quality than CBR (constant bitrate).[2] ABR encoding is desirable for users who want the general benefits of VBR encoding (an optimum bitrate from frame to frame) but with a relatively predictable file size.[1] Two-pass encoding is usually needed for accurate ABR encoding, as on the first pass the encoder has no way of knowing what parts of the audio or video need the highest bitrates to be encoded.[3]
In telecommunications, averagebitrate (ABR) refers to the average amount of data transferred per unit of time, usually measured per second, commonly...
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...
Constant bitrate (CBR) is a term used in telecommunications, relating to the quality of service. Compare with variable bitrate. When referring to codecs...
an entire movie at an averagebitrate the user specified, varying the quality of the video in order to achieve the target bitrate. This meant that a simple...
refer to: Available Bit Rate, a service used in ATM networks Averagebitrate, the average amount of data transferred per second Area border router, in...
HP and showed that, for HEVC MP, the averagebitrate reduction based on PSNR was 44.4%, while the averagebitrate reduction based on subjective video quality...
1080p video encoded with VC-1 or AVC at an averagebitrate of 12 Mbit/s, which corresponds with the average length of Hollywood feature-films. If quality...
encoding in VBR with exactly the right quality setting to meet the target averagebitrate. Voice Activity Detection (VAD) When enabled, voice activity detection...
Linear PCM), MP4 (Movie: MPEG4 AVC/H.264*; Audio: AAC) *Variable (averaged) bitrate Full HD video (1080p) up to 60 fps, HD (720p) up to 120 fps C-LOG...
recordings can extend to over 30 minutes on a side. If a side exceeds the average time, the maximum groove amplitude is reduced to make room for the additional...
are compared in video codecs comparisons: Video quality per bitrate (or range of bitrates). Commonly video quality is considered the main characteristic...
target bitrate (e.g., 500 kbps) – and that is the bitrate regardless of the access network over which it is delivered. If the chosen target bitrate is too...
mp3HD stream allowed for exact replication of CD-quality audio tracks. Averagebitrates varied between 500 kbit/s to 900 kbit/s depending on genre, similar...
preliminary VP9 support), VP9, like H.264, required about two times the bitrate to reach video quality comparable to HEVC, while with synthetic imagery...
is the bitrate including the RLC/MAC headers, but excluding the uplink state flag (USF), which is part of the MAC header, yielding a bitrate that is...
encoding allowed the channel to maintain the same average bandwidth while allowing an increase in bitrate for more demanding programme scenes such as fast...
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