The effect of codec configuration on encoded audio outputĪudio codecs typically employ cleverly-designed and highly-complex mathematical algorithms to take source audio data and compress it to take substantially less space in memory or network bandwidth. For example, if the encoder is configured to reduce the sample rate, the sample rate's effect on the output file will be reduced in kind.įor more information about these and other features of audio data, see Audio data format and structure. Of course, these effects can be altered by decisions made while encoding the audio. Source detail may make the encoded file larger it will never make it That may or may not be the same as the original sample size. Resulting in more accurate representation of each sample.ĭepends on the codec codecs typically have an internal sample format The larger the samples, the more detail each sample can contain, Increasing the sample rate increases the encoded audio file's size. The more samples available per second, the higher the resulting encoded Generally reduces the amount of compression which is possible. Hiss, static, or background noise increases the audio complexity, which Reduce in size while maintaining precision). Making the audio waveform more complicated and therefore difficult to Unwanted background noise or hiss tends to reduce audio quality bothĭirectly (by masking details of the foreground audio) and indirectly (by The number of channels affects only the perception of directionality,Įach channel may substantially increase the encoded audio size,ĭepending on contents and encoder settings. The effect of source audio format and contents on the encoded audio quality The table below lists a number of key source audio file format factors and their impact on the encoded audio. However, a number of factors do still affect the encoded audio quality and size. There is no video track on the file, the file is typically referred toĪs an MP3 file, even though it's still an MPEG format file.īecause encoded audio inherently uses fewer bits to represent each sample, the source audio format may actually have less impact on the encoded audio size than one might expect. When MPEG-1 Audio Layer III codec data is stored in an MPEG file, and
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Pulse Code Modulation (PCM) of Voice Frequencies In addition, browsers may choose to support additional codecs not included on this list. Of course, individual browsers may or may not choose to support all of these codecs, and their support for which container types can use them may vary as well.
If all you need to know is which codecs are even possible to use, this is for you.
The list below denotes the codecs most commonly used on the web and which containers (file types) support them. See Codecs used by WebRTC for details.įor information about the fundamental concepts behind how digital audio works, see the article Digital audio concepts. In this article, we look at audio codecs used on the web to compress and decompress audio, what their capabilities and use cases are, and offer guidance when choosing audio codecs to use for your content.Īdditionally, WebRTC implementations generally use a subset of these codecs for their encoding and decoding of media, and may support additional codecs as well, for optimal cross-platform support of video and audio conferencing, and to integrate better with legacy telecommunication solutions. The processing of audio data to encode and decode it is handled by an audio codec ( COder/ DECoder).
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For web developers, an even bigger concern is the network bandwidth needed in order to transfer audio, whether for streaming or to download it for use during gameplay. Even modest quality, high-fidelity stereo sound can use a substantial amount of disk space.
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