Actionscript 3 :: Low-latency Audio Streaming In Flash?
Mar 6, 2012
Suppose there is a live WAV stream that can be reached at a certain URL, and we need to stream it with as little latency as possible. Using HTML5 <audio> for this task is a no-go, because browsers attempt to pre-buffer several seconds of the stream, and the latency goes up accordingly. That's the reason behind using Flash for this task. However, due to my inexperience with this technology, I only managed to get occasional clicks and white noise. What's wrong in the code below?
var soundBuffer: ByteArray = new ByteArray();
var soundStream: URLStream = new URLStream();
soundStream.addEventListener(ProgressEvent.PROGRESS, readSound);[code]....
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Apr 7, 2012
When synthesising sound using the SAMPLE_DATA event of the Sound class, the Flash documentation recommends writing out as many samples as possoible up to 8192. On my system the sound cuts out unless I write at least 4192 samples each event. That's a full tenth of a second, which is going to be user-noticeable.
I may have the option of buffering things up ahead of time, but this is a major annoyance for my application.Is there any way of getting lower latency audio output?
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Sep 22, 2010
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Oct 21, 2010
I can't find the setttings for have a least latency as possible, either the video quality is bad or the latency is up than 5 secondes...What should i do?
[Code]...
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Dec 9, 2010
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Aug 25, 2009
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[Code]...
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<?xml version="1.0" encoding="utf-8"?>
import flash.display.Sprite;
import flash.events.Event;
[Code].....
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Oct 8, 2010
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[Code]...
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May 22, 2009
I have several flash based lessons that I have created that are being distributed online to several companies. Each lesson has a video that is played within the lesson through the flvplayback control. The videos were supplied by a third party and some of the videos are encoded at 384K and some are at 568K.
One company that is attempting to view the lessons is seeing the following behavior. The video plays for approximately 20 seconds then suddenly the video drops out and the audio continues to play. With the audio still playing the video scrubber rolls back and attempts to start the video again but all that comes through is the audio track again. Now there are 2 instances of the audio playing with no video. This happens a third time and finally keeps going until all the audio is played out.
The IT staff at the company has showed me a fiddler log that shows the flash player making a connection out to Akamai to retrieve the video and then rolling from port 80 to port 1935 and finally to port 443. This would explain the three audio tracks playing
I have read that the flash player will attempt to gather the stream from the stated rtmp location and then if it encounters an issue with a proxy or firewall it will attempt the other ports.So I am not sure if there is anything I can do by design or programatically to alleviate this issue. It appears to me that the company attempting to view this video has some kind of bandwidth throttling program in place that is kicking off this behavior in the flash player.
Is it possible to prevent the flash player from making the three attempts? Would a sudden cut of bandwidth prompt the player to attempt to roll to another port if a network load balancing program suddenly kicked in? If it is bandwidth is that why the audio stream continues to play because there is enough bandwidth for the audio track to get through, but not the video?
I have attached a screen shot of the sniffer output so you can see the rolling ports thing.
Attachments:
networkSniffer.gif
(33.7 K)
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