Preloading audio?

I'm having a problem with audio. It plays the sound, but it's
getting chopped off like it's only doing one frame. When I make a
minimal test file it seems to work. When I put it back in the main
file it chops off.
1) I'm using all actionscript, and it's all in an actions
layer on one frame. Can that (one frame) be a problem, or would it
be getting clobbered by something I have already going on, like the
onEnterFrame stuff? (
3) I'm using attachSound();
4) There's a lot of sound files, so I tried preloading them
into a separate swf and loading that with loadMovie, but I'm not
getting any love there either.
Anybody have any suggestions, or links to even more examples
of preloading audio I havent' tried? At last count it was about
300. I've been at this for way too long!
Thanks!
T

Well, it seems that it was getting clobbered by onEnterFrame.
Now I have a problem with timers, which I'll post under a different
subject.

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Regarding your second question, we don't do anything special (like changing the font size in the CSS) for the scaling; we apply a scale transform to the font and let the browser handle the rest. You might want to try applying that manually to see if it's a problem with the browser.
Regarding your third question: we're looking at video for a future release, but you shouldn't expect it immediately. If you're looking at a project in the next little while, you might want to rely on external libraries like edgehero.
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http://www.youtube.com/watch?v=dvRj-ZQvpFE
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Agapyla wrote:
so the idea is all projects for iOS cannot use Edge Audio feature that was just released last month? At least in full way, as it is shown in built-in Edge Tutorial (autoplay)?
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Hi there,
Sorry, but iOS (or more accurately, MobileSafari) doesn't support audio preloading (nor do browsers on most Android devices). This is a design choice on Apple's and other mobile device manufacturers part. See here for more info:
https://developer.apple.com/library/safari/documentation/AudioVideo/Conceptual/Using_HTML5 _Audio_Video/Device-SpecificConsiderations/Device-SpecificConsiderations.html#//apple_ref/ doc/uid/TP40009523-CH5-SW1
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I am testing a simple Edge Animate animation that it has only 1 audio file and 1 simple button with audio playback action. Nothing more.
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Hi. I've experienced the same problem with audio and preload.
Sorry for my english, but - I dont know if I've understood the
matter- I think you are talking about to fix this problem using
actionscript code. Please, would you answer me one question? If I
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I hope you understand me!
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Is there any way of storing audio- / video-elements in the browser cache in Safari in iOS?

Hi there,
I'm desperatly trying to find a solution for a web application that has to run on an iOS-Safari (e.g. on iPad, iPad2 and iPhone 4):
It's a web-application I wrote some time ago which lets the user search for and listen to short music samples (MP3s, all from ~100 kB to ~1.5 MB). The audio player is Flash-based, so it doesn't work on iOS-devices at the moment and I'll have to implement an alternative either in HTML 5 or with a "direct" QuickTime-object.
Both my HTML 5- and QuickTime-alternatives for iOS-devices work fine so far, but there's one major problem I can't find a solution to:
Unlike Flash and most HTML 5-capable browsers on Windows Safari on my iPad 2 won't store the audiofiles in the browsercache after loading and playing them - neither with HTML 5 audio-tags nor with a QuickTime-Object. Every time I load an audio file for playback from the server (with JavaScript-Commands, so without changing or reloading the whole page) it's downloaded again completely.
If a user listens to sample A and then to sample B, Safari forgot about having played sample A and downloads the whole MP3 again if I like to listen to it again. On a mobile device with a potentially narrow bandwith this behaviour is out of the question.
Is there a way of storing downloaded audiofiles opened by HTML 5 or QuickTime in Safari's cache so it remembers already having downloaded them - like it caches usual "web-files" like HTML, CSS or JPEG-images, or like Flash stores such objects in its local cache?
The Application Cache with a manifest-file is not an option - this only seems to work if the browser is offline, for example if the iOS-device is in "Airplane"-Mode.

Yes, I watched it. It contains interesting stuff I have to admit I didn't know yet, but unfortunately I still can't find a solution to my problem:
My first attempt was trying to use the Application Cache with a manifest file - although this is not really the intended purpose for my application... I don't have a static set of files that I want to have cached or "available offline" - I just want to cache MP3s which the user has played yet.
It should be possible to use a "dynamic manifest": One that is parsed by the Apache PHP module and listing the files played so far from a PHP session - something like this:
<?php
session_start();
header("Content-Type: text/cache-manifest, charset=UTF-8");
echo "CACHE MANIFEST\n";
foreach($_SESSION['playedSongs'] as $song)
    echo $song."\n";
?>
So whenever a song is loaded / played, I could access the PHP session with AJAX, insert the filename of the played file and manually update the manifest by calling window.applicationCache.update().
There are two problems with this:
First of all: It doesn't work. And I didn't even get to the point of trying to use a dynamic manifest:
<!DOCTYPE html>
<html manifest="cache.manifest">
    <head>
        <title>Test</title>
        <script type="text/javascript">
        function playStuff(id)
            if(id == 1)
                window.document.getElementById("audio").innerHTML = '<audio controls preload="automatic" autobuffer><source src="song01.mp3" type="audio/mp3" /></audio>';
            else if(id == 2)
                window.document.getElementById("audio").innerHTML = '<audio controls preload="automatic" autobuffer><source src="song02.mp3" type="audio/mp3" /></audio>';
        </script>
    </head>
    <body>
        <div id="audio"></div><br />
        <br />
        <input type="button" value="playStuff(1)" onclick="playStuff(1)" />
        <input type="button" value="playStuff(2)" onclick="playStuff(2)" />
    </body>
</html>
The cache.manifest looks like this:
CACHE MANIFEST
song01.mp3
song02.mp3
and is properly returned from Apache as "text/cache-manifest" by adding
AddType text/cache-manifest manifest
to the .htaccess of this directory.
The Apache-logs clearly show that the Safari (respectively "AppleCoreMedia") doesn't care about the application cache when it comes to audio-files:
Safari itself seems to acknowledge the manifest and indeed preload the files:
192.168.0.40 - - [23/Jul/2011:12:45:46 +0200] "GET /websql/index2.html HTTP/1.1" 200 2619 "-" "Mozilla/5.0 (iPad; U; CPU OS 4_3_3 like Mac OS X; de-de) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5"
192.168.0.40 - - [23/Jul/2011:12:45:46 +0200] "GET /websql/cache.manifest HTTP/1.1" 200 79 "-" "Mozilla/5.0 (iPad; U; CPU OS 4_3_3 like Mac OS X; de-de) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5"
192.168.0.40 - - [23/Jul/2011:12:45:46 +0200] "GET /websql/cache.manifest?%3E HTTP/1.1" 200 79 "-" "Mozilla/5.0 (iPad; U; CPU OS 4_3_3 like Mac OS X; de-de) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5"
192.168.0.40 - - [23/Jul/2011:12:45:46 +0200] "GET /websql/song02.mp3 HTTP/1.1" 200 120525 "-" "Mozilla/5.0 (iPad; U; CPU OS 4_3_3 like Mac OS X; de-de) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5"
192.168.0.40 - - [23/Jul/2011:12:45:46 +0200] "GET /websql/song01.mp3 HTTP/1.1" 200 120525 "-" "Mozilla/5.0 (iPad; U; CPU OS 4_3_3 like Mac OS X; de-de) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5"
Up to this point I did nothing but opening my test-application in Safari.
Playing song01.mp3:
192.168.0.40 - - [23/Jul/2011:12:47:25 +0200] "GET /websql/song01.mp3 HTTP/1.1" 206 2 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:47:25 +0200] "GET /websql/song01.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:47:25 +0200] "GET /websql/song01.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:47:25 +0200] "GET /websql/song01.mp3 HTTP/1.1" 304 - "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:47:25 +0200] "GET /websql/song01.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:47:29 +0200] "GET /websql/song01.mp3 HTTP/1.1" 304 - "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:47:29 +0200] "GET /websql/song01.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
Playing song2.mp3:
192.168.0.40 - - [23/Jul/2011:12:48:04 +0200] "GET /websql/song02.mp3 HTTP/1.1" 206 2 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:48:04 +0200] "GET /websql/song02.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:48:04 +0200] "GET /websql/song02.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:48:04 +0200] "GET /websql/song02.mp3 HTTP/1.1" 304 - "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:48:04 +0200] "GET /websql/song02.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:48:05 +0200] "GET /websql/song02.mp3 HTTP/1.1" 304 - "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:48:05 +0200] "GET /websql/song02.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
Playing song1.mp3 again:
192.168.0.40 - - [23/Jul/2011:12:48:38 +0200] "GET /websql/song01.mp3 HTTP/1.1" 304 - "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:48:38 +0200] "GET /websql/song01.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:48:38 +0200] "GET /websql/song01.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:48:38 +0200] "GET /websql/song01.mp3 HTTP/1.1" 304 - "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:48:38 +0200] "GET /websql/song01.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:48:40 +0200] "GET /websql/song01.mp3 HTTP/1.1" 304 - "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:48:40 +0200] "GET /websql/song01.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
Playing song2.mp3 again:
192.168.0.40 - - [23/Jul/2011:12:49:12 +0200] "GET /websql/song02.mp3 HTTP/1.1" 304 - "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:49:12 +0200] "GET /websql/song02.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:49:12 +0200] "GET /websql/song02.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:49:12 +0200] "GET /websql/song02.mp3 HTTP/1.1" 304 - "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:49:12 +0200] "GET /websql/song02.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:49:13 +0200] "GET /websql/song02.mp3 HTTP/1.1" 304 - "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
192.168.0.40 - - [23/Jul/2011:12:49:13 +0200] "GET /websql/song02.mp3 HTTP/1.1" 206 120525 "-" "AppleCoreMedia/1.0.0.8J2 (iPad; U; CPU OS 4_3_3 like Mac OS X; de_de)"
Every file is downloaded again completely when playing it. So "AppleCoreMedia" (whatever this may be exactly, the QuickTime-plugin that is triggered by the HTML 5 audio-element I suppose?) either doesn't have access to the Application Cache or simply just doesn't realize the files in it. So if I switch my iPad to "Airplane Mode" now, the Safari is unable to access / load / play the files.
I also tried using a QuickTime-object instead of an HTML 5 audio-tag (as far as I know HTML 5 audio and video in Safari always use QuickTime?) and controlling it with something like:
document.movie1.SetURL('song02.mp3');
Nothing changes, it's just like using HTML 5 audio and everything gets downloaded again when loading/playing it.
And even if this would work there'd still be a problem:
To properly implement that I would have to load the MP3-file in the Application Cache before playing it. When doing this it seems impossible to show a "real" progress: The ProgressEvent that is fired from the Application Cache after updating it doesn't seem to provide any information about data loaded so far and the complete size of a file. It's just "File 1 from 2" and so on, and not a "real" progress where I could determine something like: "100 kB of 1.2 MB loaded" as I can with the audio-element.
All the other storage-approaches like Web SQL / Web Database or Local Storage are no help either:
I don't see any way of getting the MP3 data into Local Storage or Web Database or getting it out again to play it. The HTML 5 Canvas-element has a toDataURL()-function to produce a Base64-encoded representation and use it for storage - the Audio-element doesn't seem to have anything like this.
My last really "dirty" approach was trying to load "manually" Base64-encoded-MP3s with a combination of AJAX and PHP: A PHP-script outputs a Base64-representation of a MP3-file and is loaded by AJAX, so I could store the Base64-representation e.g. as Local Storage or in Web Database:
<?php
$infile = 'song01.mp3';
$contents = file_get_contents($infile);
$base64 = base64_encode($contents);
$audio = 'data:audio/mp3;base64,'.$base64.'';
echo $audio;
?>
I tried using the resulting AJAX responseText as the source-argument in an audio-source-tag. Suprise: It doesn't work in Safari on my iPad 2, the player just fails to load the "file", although this works fine in Chrome on Windows. Possibly a size limitation for Base64-URIs on Safari / iOS.
And again: Even if this was working in iOS/Safari I don't know of a way to determine a real progress from an AJAX-query...
The last thing I could think of is not replacing the audio- or source-tags when loading a song but leaving them in the DOM-structure, check if it's already there when a song is loaded and just add a new audio-tag if a song hasn't been loaded yet.
This solution would be my last resort: I'd have to rewrite nearly the whole application to completely operate on JavaScript / AJAX to stay on one site in the browser - else the "cached" audio data would be lost again when changing to another site in Safari.
Furthermore I think there'll be a small cache limit somewhere when doing this?
Any ideas?

Problem with audio shortcut buttons (windows 7), especially mute

I some severe issues and had to do a clean install of windows 7. I lost all the preloaded lenovo applications. I cannot get the short cut mute button to work. The up/down volume buttons work, but they don't show the change in volume (green bars on the screen) that they used to show. Mute does not work at all. Can someone please help me? I assume I need to install a driver to get this working again.
the drivers I have installed are power manager, audio, bios, and hotkey. I thought the hotkey driver would fix it, but I haven't had any luck.
thanks

Same problem here after clean install of W7-64 on a T500. None of the green screen indicators (screen brightness, ThinkLight, volume, and mute) show up. All functions except mute work, but without indicators.
Can somebody help?
Thanks.

How do I get my HTML5 audio tag to work in Firefox 7.0.1, currently it doesn't even display the alternate text when the player cannot play.

This is my implementation of the audio tag.
<pre><nowiki><div class="music_player" oncontextmenu="return false;">
<audio autoplay="autoplay" controls="controls" preload="auto">
<source src="sample.ogg" />
<source src="sample.mp3" />
<span id="audio_error">This website has an audio sample, but cannot play using this browser.
</span>
</audio>
</div></nowiki></pre>

Make sure that the server sends the ogg file with a supported MIME type.
* https://developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements
* https://developer.mozilla.org/en/Configuring_servers_for_Ogg_media

Video/audio Stuttering on Macbook 13

Hi All
I have a mid 2007 Macbook 13 running OS X Lion 10.7.4. all up to date. Initially I had 4G's of ram ( I know it only reads 3 ) now I have it running on only 2.
Problem is video/audio stuttering when running movies. mostly netflix and or connected to a flat screen tv. on wireless or wired connection. but it also happens just running youtube videos or videos that I have on the system mostly in .AVI format. I could be running movies with VLC or quicktime and same ting. I've tried turning every running program off. like firewall, little snitch, sophos AV, etc. after turning them all off I do a restart. I have done permssion repair, checked the disk, run the daily scripts, even downgraded to SL to see if Lion was too much for the system and nothing. of of the 4G's of ram that I have. I swapped them to see if maybe one or 2 of them ware bad. when I install the operating system, I do a clean install. delete partition, format, the whole thing and bring it up to date. not all at one time. disk permissions repaired after each big updated. almost half the time the videos will run ok and than it starts stuttering. when is doing it. not even the mouse responds in those few seconds. is like something is grabbing all the system memory for a few seconds at a time. it has gotten to the point that the system completly frezzes and I get that black translusent window that says the system needs to be restarted.
I have about 40% free HD space.
Any ideas ?
Thanks

Welcome to Apple Support Communities.
The behavior you mention is typical of MacBooks with the GMA 950 video chipset and 64MB VRAM.
The best solution I've found is to quickly pause the video and let the video load completely before watching, IF the website allows it and will preload the content. Not all of them do. Some sites automatically buffer before they begin playing.
Watch in a window rather than full-screen.
Watch content on your MacBook screen rather than a HDTV.
The Safari Extension "ClickToFlash" lets you choose whether to load Flash content at all. It also allows 'preferring' H264/HTML5 web video content when available, and seems to be a bit better than simply defaulting to Flash content for every website.
I have a mid-2007 MacBook 2,1 with 4/3GB RAM. It is the very oldest model capable of supporting Lion. After reading of performance issues with these older systems in these forums, I chose to remain on Snow Leopard rather than upgrading to Lion. Snow Leopard runs most things I do very well in 3GB. Lion really seems to need 4GB and would like 8GB, from what I read here.
You don't mention how fast your internet connection is. A faster internet connection MIGHT help some. A wired Ethernet connection MIGHT offer a bit more throughput than WiFi. Worth trying out, especially if you have a friend with a faster connection where you can try before you pay to upgrade.
Ultimately we're talking about 5-year-old computers. That's "ancient" in computer life cycles, and the best solution (not most cost-effective) is a new(er) Mac. It's not a problem unique to Mac. Old Windows XP systems lack the performance of new hardware running 64-bit Windows 7.
New or recent Refurbs with 4GB or more RAM, faster video chipset, more VRAM, faster clock-speed, Intel "Sandy Bridge" (or "Ivy Bridge" likely coming soon) dual-core or quad-core processor, and, yes, a hefty pricetag to match. Anything else is at best a temporary measure to buy a bit of time (a year, maybe?) until you can purchase a new(er) faster better Mac.
Message was edited by: kostby

Preloading audio?

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