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.
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| - Average bitrate (en)
- 평균 비트레이트 (ko)
- 平均码率 (zh)
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| rdfs:comment
| - 평균 비트레이트(ABR)는 단위시간당(주로 초) 전송된 평균적인 데이터의 양을 나타내는 것으로 주로 디지털 오디오나 비디오의 경우를 지칭한다. (ko)
- 平均码率通常是指数字音乐或者影片的平均码率，可以简单的认为等于文件大小除以播放时间。例如常用的RMVB在压缩电影时常常设定视频平均码率为450kbps，则平均每秒占用约55千字节，这样可以估算10分钟的视频大小约为55KB*60*10=33MB，2小时的视频则约为400MB。码率并不是衡量音频/视频质量的唯一标准，格式、图像大小、音频采样率、音频解析度等因素也是很重要的指标。 由于在实际编码中，会根据图像/音频的复杂程度，而对码率进行一些调整，以达到最好的控制文件大小及质量，因此，最终的平均码率并不能在编码之前确定下来，波动幅度较大。为了从一定程度解决这个问题，二次编码方式诞生了。它在第一次编码时不进行实际编码运算，仅仅是计算码率，第二次利用这一计算结果为基础，根据设定值进行调整，并最终编码。 除了平均码率之外，最高码率，或者叫码率峰值，也是与码率有关的一个参数。当码率峰值高过处理器所能处理的强度时，可能会造成播放延迟。 以上概念是针对可变码率编码（VBR）而言的，实际上平均码率编码方式理论和此完全不同，请参见下一节。 (zh)
- 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. (en)
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| - 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. At a given bitrate, VBR is usually higher quality than ABR, which is higher quality than CBR (constant bitrate). 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. 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. (en)
- 평균 비트레이트(ABR)는 단위시간당(주로 초) 전송된 평균적인 데이터의 양을 나타내는 것으로 주로 디지털 오디오나 비디오의 경우를 지칭한다. (ko)
- 平均码率通常是指数字音乐或者影片的平均码率，可以简单的认为等于文件大小除以播放时间。例如常用的RMVB在压缩电影时常常设定视频平均码率为450kbps，则平均每秒占用约55千字节，这样可以估算10分钟的视频大小约为55KB*60*10=33MB，2小时的视频则约为400MB。码率并不是衡量音频/视频质量的唯一标准，格式、图像大小、音频采样率、音频解析度等因素也是很重要的指标。 由于在实际编码中，会根据图像/音频的复杂程度，而对码率进行一些调整，以达到最好的控制文件大小及质量，因此，最终的平均码率并不能在编码之前确定下来，波动幅度较大。为了从一定程度解决这个问题，二次编码方式诞生了。它在第一次编码时不进行实际编码运算，仅仅是计算码率，第二次利用这一计算结果为基础，根据设定值进行调整，并最终编码。 除了平均码率之外，最高码率，或者叫码率峰值，也是与码率有关的一个参数。当码率峰值高过处理器所能处理的强度时，可能会造成播放延迟。 以上概念是针对可变码率编码（VBR）而言的，实际上平均码率编码方式理论和此完全不同，请参见下一节。 (zh)
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