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• 2 AudioQueue questions

  - by iter

  I am learning to use AudioQueue. I wish to generate an audio stream programmatically. I have 2 issues that I cannot account for. I am getting audio when I run in the simulator, but not on an iPhone. (Other apps do produce sound on the phone). I get about 20ms-long gaps of silence between buffers. In my testing, I generate an audio buffer on startup and repeatedly enqueue it without modification. I don't spend any processing on filling audio buffers at runtime, not even copying them. Ari.

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• Extract wav file from video file

  - by Nikos Steiakakis

  I am developing an application in which I need to extract the audio from a video. The audio needs to be extracted in .wav format but I do not have a problem with the video format. Any format will do, as long as I can extract the audio in a wav file. Currently I am using Windows Media Player COM control in a windows form to play the videos, but any other embedded player will do as well. Any suggestions on how to do this? Thanks

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• Dynamically calculate frequency value.

  - by MS Nathan

  Hi, In my app, I want to find/calculate the audio frequency as dynamically when i am recording an audio and no need to save, play and all. Now i am trying to do that with help of an aurioToch sample code. In that sample, inside FFTBufferManager class methods such as GrabAudioData and ComputeFFT,Here I am not able to find where they are calculating frequency value as dynamically depends on the audio sound and I spent more than 5 days.please help me.

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• How do you control the playback levels (decibles?) using the iPhone AVAudioPlayer? Or do I need to u

  - by Joshua

  My audio clips sound perfect when I upload them to the iPhone via iTunes. And I am pretty sure it is because the iPod has a maximum playback level, so the audio doesn't sound overdriven. In my app, I include the same audio files, and when I play them [myAudio play]; the levels are so high that the audio becomes indiscernible. I found in the library http://developer.apple.com/iphone/library/documentation/AVFoundation/Reference/AVAudioPlayerClassReference/Reference/Reference.html#//apple_ref/doc/uid/TP40008067-CH1-SW2 that it says that you can "Control relative playback level for each sound you are playing" but I've been searching this issue out for hours and I haven't gotten anywhere. Any help would be wonderful!

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• Sound sample recognition library/code

  - by Daniel Mošmondor

  I don't want sound-to-text software. What I need is the following: I'll record multiple (say 50+) audio streams (recordings of radio stations) from that recordings, I'll mark interesting audio clips - their length ranges from 2 to 60 seconds - there will be few thousands of such audio clips library should be able to find other instances of same audio clips from recorded sound streams confidence factor should be reported to used and additional input provided so the recognition could perform better next time Do you know of such software library? LGPL would be most valuable to me, but I can go for commercial license as well.

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• How could I represent 1.625 by 0 or a 1 (binary digit)?

  - by pepito

  This is an excerpt from wikipedia about 'full rate' speech coding standard. Full Rate or FR or GSM-FR or GSM 06.10 was the first digital speech coding standard used in the GSM digital mobile phone system. The bit rate of the codec is 13 kbit/s, or 1.625 bits/audio sample. And this one is an excerpt from wikipedia about bit. In computing parlance, bit is the abbreviation for a single binary digit, represented by a 0 or a 1. How could I represent 1.625 by 0 or a 1? Actually, that's my lecturer's question that I could not answer. Some links to papers are more than welcome. Thanks in advance.

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• Apress Deal of the Day - 5Mar/2011 - Crafting Digital Media: Audacity, Blender, Drupal, GIMP, Scribus, and other Open Source Tools

  - by TATWORTH

  Today's Apress $10 deal of the day at http://www.apress.com/info/dailydeal has been on before. I have a copy and it is useful read on open source applications for Windows. Crafting Digital Media: Audacity, Blender, Drupal, GIMP, Scribus, and other Open Source Tools Open source software, also known as free software, now offers a creative platform with world-class programs. Crafting Digital Media is your foundation course in photographic manipulation, illustration, animation, making music, video editing, and more using open source software.

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• Video/audio streaming does not stop even if UIWebView is closed - iPad

  - by lostInTransit

  Hi I see this issue only on the iPad. The same things works as expected on the iPhone. I am opening the URL from my application in a UIWebView. If the URL is a normal web page, it works fine as expected. But if the URL is that of a remote video/audio file, the UIWebView opens the default player which is again good. Now when I dismiss the UIWebView (by clicking on the Done button on the player), the streaming doesn't stop and the audio/video keeps playing in the background (I cannot see it but it does keep playing in the background, can hear it). The UIViewController in which the webview was created is also dealloced (I put in a log statement in the dealloc method) but the streaming doesn't stop. Can someone please help me out on why this could be happening? And how can I stop the audio/video streaming when the UIWebView is closed? Thanks.

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• How to create an Audio CD using C# or Java

  - by Elie

  I'm looking for an API that would allow me to create an audio CD from within a C# application. The CDs are to be created and closed in the same session (no rewrite required). Basically, my application locates files on behalf of a user, and, if a blank CD is present in the drive, creates an audio CD for the user. If no CD is present, it checks to see if there's a USB drive attached and copies the files there (this part I already know how to do). I would prefer to write this application in either C# or Java, as I'm most comfortable with those, but I don't know how hard it would be to create CDs using either language. There are several other questions here that deal with regular CDs, but I didn't see any discussing audio CDs.

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• Recording Audio through RTMP/Rails

  - by Lowgain

  I am in the process of building a rails/flex application which requires audio to be recorded and then stored in our amazon s3 account. I have found no alternative to using some form of RTMP server for recording audio through flash, but our hosting environment will not allow us to install anything like FMS, Red5, etc. Is there any existing Ruby/Rails RTMP solution that will allow audio recording? If not, is it possible for Rails to at least intercept the RTMP stream and then I can hope to reference red5 or something for parsing the data (long shot, I know)? The other alternative I can think of is hosting a red5 server on another host and communicating with our rails app once the saving/uploading is done, which is not preferred. Am I going to have any luck here?

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• Quicktime Audio Extraction for Compressed Movies

  - by Noorul

  Hi all, I am trying to extract audio from Quicktime Movie. I followed the steps in http://developer.apple.com/quicktime/audioextraction.html. It works fine.But When i try to extract any movies which is compressed(Audio is compressed as AAC), it gives a first chance exception.. In callstack it shows CoreAudioToolbox.dll... If is do continue it renders the audio without any issues. In Mac, this works without any issues. Is this really anything to worry about... I am a QT Beginner. Please help me My QT version is 7.6.7(1675) I am using Windows7

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• Audio input via HTML5?

  - by tibbon

  We have a VoIP application imVOX, and we are looking at various ways of expanding our reach. Part of that is writing an HTML5 application, but it requires the use of audio input from the browser (and also push to talk buttons from the browser, even if another app is focused). On the audio side, with HTML5 is there any way of taking audio input from the browser to compress and send to our servers? I know with Flash such is possible, but we're trying to avoid flash for mobile compatibility and generally looking toward the future.

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• iPhone audio Filter Question

  - by Joe

  Okay, I am going to try to make this totally not a "plz send teh codez kthxbai" I am considering an app which takes sound (eventually an audio track) and applies an audio filter to it. So I can play sounds with AudioServicesPlaySystemSound via AudioToolbox framework just fine. What I need is a very simple example of how I might take a sound and apply (for instance) midrange boost etc. Actually the kind of alteration is irrelevant -- if I can get my head around how the alteration is done I can figure out the rest. I am just finding both docs and examples of altering audio in code to be very scarce. Thanks for any help!

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• How to right click and play audio folder on WMP 12

  - by Mehper C. Palavuzlar

  It's always been hard for me to add a music folder to Windows Media Player's playlist. I double click a file in the folder, WMP opens, and I drag the other files manually to the playlist. Isn't there an option to add a right-click context menu item that automatically add all audio contents in a folder to WMP playlist?

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• Legality of ripping DVD audio

  - by Smashery

  I want to buy several live music DVDs, but I also want to be able to put the music in my playlists. It seems ridiculous that I should also have to buy the Live CD version. Is it legal (particularly under Australian law) to rip the audio?

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• install pymedia and python audio tools

  - by aaron

  I noticed a pattern of errors while trying to install PyMedia and Python Audio Tools. For both modules I run the following: $ python setup.py install Then I get a series of compilation errors, and then this: lipo: can't figure out the architecture type of: /var/folders/Kx/Kxxj4868HGi6VMhZLPyZN++++TI/-Tmp-//cch1y9AO.out error: command '/usr/bin/gcc-4.2' failed with exit status 1 I'm running Mac OS X 10.5, and this happens whether I'm using gcc-4.0 or gcc-4.2, Mac-Python 2.5 or 2.6, and MacPorts-Python 2.6. What's going on?

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• Costs of a professional audio streaming solution

  - by Frederico

  How much does a professional hardware solution cost, for streaming 8 audio channels to 100 concurrent listeners? Do you have any suggestions on suitable solutions?

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• Dell Vostro 1000 audio and wireless NIC drivers

  - by Ssvarc

  I have a Dell Vostro 1000 laptop with a fresh XP Pro install. I'm trying to track down the correct audio and wireless NIC drivers. I've used this Dell support driver page, but the drivers it gives for the service tag and XP OS don't work. Anyone have links to the correct, working drivers?

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• Alternatives to musicbrainz picard -audio-fingerprinting tagging services [closed]

  - by Journeyman Geek

  Possible Duplicate: Auto-tagging MP3s I'm currently using musicbranz picard to tag files that don't have any usable tagging information. For some reason, currently none of the files I trying to ID seem to be identified, despite some of them them being artists who are almost certainly on musicbrainz. So, I'm looking for something that uses an alternate database and does the same thing - to identify unknown music files off an audio fingerprint. Windows is preferred, but I would be fine with any of the big 3 OSes (Windows/Linux/OS X).

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• after deleting files like images , vedio , audio store?????

  - by Adesh soni

  after deleting files like images , vedio , audio.. , where it storing???? pls give suggestion , its urgent.................

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• digitizing audio cassettes

  - by Akhil Langer

  I am looking for a freeware equivalent to Adobe Audition software i.e. a software for digitizing audio cassettes. Please suggest some.

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• How Much Cost me a professional solution streaming Audio

  - by Frederico

  How Much Cost me a professional solution (hardware) for streaming min 8 Audio channels to 100 users (listeners)? If you know, Please give me some advice for the best solution...

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• Cannot get sound in Windows 7 - No audio devices are installed

  - by bobsr

  Just installed Windows 7. After install everything was working fine until i noticed that i had no sound. It is a AMD Athlon x64 Dual Sound works in XP, has these sound drivers Yamaha DS1 WDM HD Audio Render I tried finding the above drivers, but no luck.

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• good player to use for audio books

  - by doug

  Hi there i just find that is useful to listen audio books, but when it is about tacking notices, the play/pause, adding bookmarks is impossible with the regular players(windows media player, vlc, bsplayer, winamp). Do you know a better alternative to that?

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• Software that will extract the individual audio channels from a WMA file

  - by typoknig

  I have a 6 channel WMA file and I would like to extract each of those 6 channels into its own mono WAV file. This is a simple task with AC-3 audio files, but apparently not with WMA. I could re-encode the WMA as an AC-3 then extract the streams, but I want lossless solution. Please only confirmed solutions. I have put a lot of time into searching for a solution and have had my fill of "try this" and "this might work".

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