Adobe Community: Publish an audio-only stream (HLS)

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1. Nitin Goel,

Apr 5, 2012 6:16 AM in reply to nnmk

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Does this mean that using one FMLE encoder (with the installed AAC plugin) i can stream BOTH audio+video AND audio only stream via HLS to iOS clients?

yes

If yes, how to connect to a+v stream and how to connect audio only stream in iOS ? (To be more precise - i would need two m3u8 files, how do i create them in the provided generator)

In this case, ios can play a+v stream using m3u8 url

http://server/hls-live/livepkgr/_definst/liveevent/livestream1.m3u8

and audio-only stream using m3u8 url

http://server/hls-live/livepkgr/_definst_/liveevent/livestream1_audio_ only.m3u8

Using the generator you can create a variant playlist where you can specify multiple bitrate a+v streams m3u8 url (that you already know) and audio only stream m3u8 url. This tool is just a serialiser of all the information that you provide to it. It doesn't generate individual streams m3u8 urls on it's own. This variant playlist can be hosted somewhere. When player request this variant playlist, it identifes all the bitrate and corresponding m3u8 urls. Player will then play the m3u8 url that hasbitrate just less than to its input bandwidth.

Probably I couldn't get your question clearly. Let me know if it helps.

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2. nnmk,

Apr 5, 2012 6:34 AM in reply to Nitin Goel

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Thank you sir.

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3. nnmk,

Apr 5, 2012 6:36 AM in reply to nnmk

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What about the need to provide multiple bitrates (for the audio), surely 64kbps isn't enough (64 is needed as per apple documentation) - multiple encoder machines or multiple encoder instances, how to provide multiple audio bitrate?

(surely we also need a better quality for the streamed audio but also need the 64)

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4. Nitin Goel,

Apr 5, 2012 6:49 AM in reply to nnmk

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You are right. You don't need to provide multiple bitrate audio in the variant playlist. So while specifying on FMLE

livestream%i?adbe-live-event=liveevent&adbe-audio-stream-name=livestream1_audio_only&adbe-audio-stream-src=livestream1

set adbe-audio-stream-src to such a a+v stream that that audio bitrate of 64 kbps.

This will create 4 streams for you on FMS

livestream1, livestream2, livestream3, livestream1_audio_only

On encoders other than FMLE, where it is not supported to publish multiple streams with a single publish option, you may publish

1. livestream1?adbe-live-event=liveevent&adbe-audio-stream-name=livestre am1_audio_only

2. livestream2?adbe-live-event=liveevent

3. livestream3?adbe-live-event=liveevent

This will create 4 streams for you on the FMS

livestream1, livestream2, livestream3, livestream1_audio_only

Yes, there is no point publishing audio only live stream corresponding to each a+v stream. Apple spec mandates only one audio only stream of 64kbps in variant playlist

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5. nnmk,

Apr 5, 2012 6:56 AM in reply to Nitin Goel

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Of course, but what if we need lets say 128kbs AND 64kbps audio ?

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6. nnmk,

Apr 6, 2012 1:52 AM in reply to nnmk

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Let me just confirm that the above works and correct a couple of typos in streaming links for the iOS:

A+V stream:

http://server/hls-live/livepkgr/_definst_/liveevent/livestream1.m3u8

Audio only stream:

http://server/hls-live/livepkgr/_definst_/liveevent/livestream1_audio_ only.m3u8

Thanks again Nitin, if you could just comment on how to achieve audio with two different bitrates on the encoder side when you get the time.

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7. Nitin Goel,

Apr 6, 2012 5:38 AM in reply to nnmk

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Hi nnmk,

Though I am no expert in FMLE, but just try

livestream%i?adbe-live-event=liveevent&adbe-audio-stream-name=livestream%i_audio_only&adbe-audio-stream-src=livestream%i

I assume, FMLE will replace all %i to numbers (not just %i in actual stream name)

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Adobe Media Server

Publish an audio-only stream (HLS)

Apr 5, 2012 5:51 AM

Hi,

"To serve streams over a cellular network, one of the streams must be audio-only. For more information, see HTTP Live Streaming Overview.

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