RTMP Audio Only Streams and the BufferTrait

I'm encountering and issue when trying to access the bufferTrait of an RTMP stream that is audio only.
I can "getTrait" and it retrieves it, but when I try to adjust the bufferTime, it doesn't register any adjustments.
We have a custom buffering to our video streams, and for video streams it is correctly adjusting the bufferTime, but for audio only running through the same custom plugin, no adjustments to the BufferTime are being made, and I can't find a way to increase the buffer.
Is there is specific limitation on BufferTrait when dealing with Audio Only?
Thanks,
-Will

Did you try creating a BufferTrait variable and then assigning to the variable.bufferTime the new value?
Do you mind publishing your code to see if there is any problem with it, please.

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Publish an audio-only stream (HLS)

Hi,
the documentation says this:
"To serve streams over a cellular network, one of the streams must be audio-only. For more information, see HTTP Live Streaming Overview.
To publish an audio-only stream, enter the following in the Flash Media Encoder Stream field:
livestream%i?adbe-live-event=liveevent&adbe-audio-stream-name=livestream1_audio_only&adbe-audio-stream-src=livestream1
If the encoder specifies individual query strings for each stream, use individual stream names instead of the variable %i:
livestream1?adbe-live-event=liveevent&adbe-audio-stream-name=livestream1_audio_only
livestream2?adbe-live-event=liveevent&adbe-audio-stream-name=livestream2_audio_only
To generate a set-level variant playlist when using an audio-only stream, specify the audio codec of the audio-only stream. Specify the audio and the video codec of the streams that contain audio and video. For more information about using the Set-level F4M/M3U8 File Generator, see Publish and play live multi-bitrate streams over HTTP.
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?
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)
What about the need to provide multiple bitrates (for the audio), surely 64 isn't enough - multiple encoder machines or multiple encoder instances?

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=livestream1_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

The Quciktime 10.3 playback the audio-only stream of mpeg2ts seem not playback correctly

The Quciktime 10.3 playback the audio-only stream of mpeg2ts seem not playback correctly.
When the Quciktime 10.3 start playback my audio-only .ts file. The qucktime seem to be muted on a about 70% of progress bar. or sometime will fast-forward for a while. (not stop playing. just muted or fast-forward and the progress bar keep going on)
but, it's playback well on Quicktime 10.2.
this audio-only ts file as my dropbox:
http://dl.dropbox.com/u/68121779/mp2lc-3.ts
I have try to download the fileSequence0.ts ~ fileSequence10.ts (from http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8) and combined this .ts as followings command on Win7:
copy /b fileSequence0.ts+fileSequence1.ts+fileSequence2.ts+fileSequence3.ts+fileSequenc e4.ts+fileSequence5.ts+fileSequence6.ts+fileSequence7.ts+fileSequence8.ts+fileSe quence9.ts+fileSequence10.ts fileSequence-0-10.ts
the Quciktime 10.2 (Mountain Lion), and Media Player 12.0.7601.18150 (Win7 64bit) seem playback well.
but, Qucitime 10.3 (Mavericks) seem muted at about 70% of progress bar.
I think quciktime 10.3 do something changed. and make some behavior incompatible.

The Quciktime 10.3 playback the audio-only stream of mpeg2ts seem not playback correctly.
When the Quciktime 10.3 start playback my audio-only .ts file. The qucktime seem to be muted on a about 70% of progress bar. or sometime will fast-forward for a while. (not stop playing. just muted or fast-forward and the progress bar keep going on)
but, it's playback well on Quicktime 10.2.
this audio-only ts file as my dropbox:
http://dl.dropbox.com/u/68121779/mp2lc-3.ts
The downloaded TS file contains AAC which uses ADTS—a self synching Audio Data Transport Stream format. According to Wikipedia, "This file and streaming-based format are defined in MPEG-2 Part 7, but are only considered informative by MPEG-4, so an MPEG-4 decoder does not need to support either format." Based on this statement, my guess is that Apple now considers such support to be no longer needed in the QT X v10.3 media player since AAC content is, by default, normally found only in MOV, MP4, M4V, M4A, M4B, and similar containers which are not only supported by the system player but all Apple mobile device players. Even the latest version of VLC seems to have dropped this support for the AAC ADTS audio found in your downloaded TS file.
As to audio dropout in QT X v10.3, the problem you describe seems to be a "sync" associated issue. On my system clicking the playhead to move its current position resets the sync and audio becomes playable again.
I have try to download the fileSequence0.ts ~ fileSequence10.ts (fromhttp://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8) and combined this .ts as followings commandon Win7:
copy /b fileSequence0.ts+fileSequence1.ts+fileSequence2.ts+fileSequence3.ts+fileSequenc e4.ts+fileSequence5.ts+fileSequence6.ts+fileSequence7.ts+fileSequence8.ts+fileS e quence9.ts+fileSequence10.ts fileSequence-0-10.ts
Somewhat confused by your playlist URL reference here. Reference is for the following:
which is a QuickDraw video file which might be more easily captured as a QT X player screen rendering at a desired playback resolution. Since you say you are dealing with other TS sequences here, I am not even certain this is the playlist file you really wanted to reference.

I want to stream all audio to my stereo via AirPort. Right now audio only streams with iTunes, not when I'm online (YouTube, SoundCloud, Spotify). What must I do? Thanks! 2011 macbook pro 10.6.8

I want to stream all audio to my stereo via AirPort. Right now audio only streams with iTunes, not when I'm online (YouTube, SoundCloud, Spotify). What must I do? Thanks! 2011 macbook pro 10.6.8

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"AirPort Express" isn't an option.
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Hi there,
Does anybody knows if it it possible to stream only audio?
I'd like to stream video+audio (different qualities : ~1000 kbps and ~400 kbps) and audio only for low-bandwidth (~128 kbps).
Adobe Flash Media Encoder Live allows me to stream different qualities. And what about audio-only stream?
And of course I don't want just to hide video on client-side.
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Hi,
Thanks for using FMS.
Yes it is possible to send one video+audio stream and another audio only stream to FMS. Or even, a single audio stream alone is good enough to be sent to FMS.
But, FMLE as of now , does not have support for two streams to be sent where one is video + audio and the other only audio. As a workaround, you can have two instances of FMLE opened (on the same machine even) and can try this.
Does that help you ?
Thank you !

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Hi Jeremy,
We'll most likely need to see the code that goes with these players. Could you please open a new bug report on this over at bugbase.adobe.com? Please post back with the URL so that others affected can add their comments and votes.
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Chris

Creating an audio-only stream from a live stream

I am using Flash Media Live Encoder (3.2) to send multiple bitrate streams to an instance of Adobe Media Server 5. In addition to the video streams, I am trying to generate an audio-only stream.
I am using the default 'livepkgr' application. The input stream contains H.264 video + AAC audio.
The stream name that I set in FMLE is set to this:
livestream%i?adbe-live-event=liveevent&adbe-audio-stream-name=livestream1_audio_only&adbe- audio-stream-src=livestream1
I created a variant playlist to include the audio-only stream. It looks like this:
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However, when I retrieve the audio-only playlist it contains a list of .ts files. If it was working correctly I would expect there to be a list of .aac files. Here's an extract from the playlist (livestream1_audio_only.m3u8):
#EXTM3U
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#EXT-X-ALLOW-CACHE:NO
#EXT-X-VERSION:2
#EXT-X-TARGETDURATION:8
#EXTINF:8,
../../../../hls-live/streams/livepkgr/events/_definst_/liveevent/livestream1_audio_onlyNum1927.ts
#EXTINF:8,
../../../../hls-live/streams/livepkgr/events/_definst_/liveevent/livestream1_audio_onlyNum1928.ts
#EXTINF:8,
../../../../hls-live/streams/livepkgr/events/_definst_/liveevent/livestream1_audio_onlyNum1929.ts
#EXTINF:8,
../../../../hls-live/streams/livepkgr/events/_definst_/liveevent/livestream1_audio_onlyNum1930.ts
Any ideas why it doesn't seem to be working?
Thanks

Hi
No !
You first have to back-engineer the DVD to something the Mac can use eg StreamingDV
(I use Roxio Toast™ to do this) then convert this via QuickTime to .aiff 16-bit 44.1 kHz
then burn this onto a CD via eg iTunes.
An Analog copy from a DVD-player to the Mac Line-in and into an audiuo editor as Audacity (free on internet) then use this for the CD is easier and about as good as. (I can't differ)
Yours Bengt W

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Error message: The selected file cannot be linked because it has 6 audio channel(s) and the clip was

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I uploaded the required media files to a new project in PrE9 and let them index and conform. I saved the project with the same name in a different location. Do I have to do this to the project files and/or the original media files? Confusion starts here.
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http://help.adobe.com/en_US/adobemediaserver/devguide/WSd391de4d9c7bd609-52e437a812a3725df a0-8000.2.3.html

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Please remember to mark the replies as answers if they help and un-mark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact [email protected]

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RTMP Audio Only Streams and the BufferTrait

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