How can I specify an audio-only alternate to an audio-video stream?

Use the CODECS and BANDWIDTH attributes of the EXT-X-STREAM-INF tag together. The BANDWIDTH attribute specifies the bandwidth required for each alternate stream. If the available bandwidth is enough for the audio alternate, but not enough for the lowest video alternate, the client switches to the audio stream.

If the CODECS attribute is included, it must list all codecs required to play the stream. If only an audio codec is specified, the stream is identified as audio-only. Currently, it is not required to specify that a stream is audio-only, so use of the CODECS attribute is optional.

The following is an example that specifies video streams at 500 Kbps for fast connections, 150 Kbps for slower connections, and an audio-only stream at 64 Kbps for very slow connections. All the streams should use the same 64 Kbps audio to allow transitions between streams without an audible disturbance. More.

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