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Search found 6479 results on 260 pages for 'audio analysis'.

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• Detect the whether an flv file contains video, audio or both

  - by Bert Vandamme

  Is there a way to detect whether an FLV file contains video, audio or both? The flv file is streamed to a flash client, that needs to show a certain view depending on the data in wrapped in the flv file.

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• Adjust OSX System Audio Volume in Python

  - by Benson

  I would like to adjust the system audio volume in OSX from a python script. This question about implementing keyboard shortcuts tells me how to do it in applescript, but I'd really like to do it from my python script without using os.system, popen, etc. Ideally I'd like to ramp up the volume slowly with some python code like this: set_volume(0) for i in range(50): set_volume(i*2) time.sleep(1)

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• iPhone Audio Delay Line

  - by garylgsimpson

  I am looking into developing an audio delay line - external microphone to line out on the iPhone. Is there any sample code anyone could recommend? I have already been playing with SpeakHere and AurioTouch. AurioTouch is helpful although complex to sift through.

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• Programmatically extract audio from YouTube video

  - by Skoder

  Hey, I'm trying to create a C# application which allows me to extract just the audio from YouTube videos. I've come across sites that already do that, but I'm not sure how they actually work. What would be the best way to do this programmatically? Thanks for any advice

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• How to programmatically generate an audio podcast file?

  - by adib

  Hi Anybody know how to programmatically generate MP3 files with bookmarks that can be used in iTunes / iPod / iPhone / iPod touch? Specifically text bookmarks (bookmarks with titles) that the listener can skip to a specific point in time in the audio file. Also how to add the text transcription of the podcast's content. Even better if you have an example Cocoa code or library to write the MP3 file. Thanks.

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• Get the length of an audio file php

  - by Belgin Fish

  How I can get the length of an audio file in php. If it's too hard to do in php then any other way should work alright.

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• Transcoding audio and video

  - by Lance Fisher

  What is the best way to transcode audio and video to show on the web? I need to do it programmatically. I'd like to do something like YouTube or Google Video where users can upload whatever format they want, and I encode it to flv, mp3, and/or mp4. I could do it on our server, but I would rather use an EC2 instance or even a web service. We have a Windows 2008 server.

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• How do I transform an audio clip?

  - by orangecl4now

  I want to get an audio clip from the microphone on my iPhone/iPad or iPod Touch. How do I transform it? Basically take the wavelength and modify it with sin (30) (or any angle).

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• Free audio players for website streaming

  - by Dennis Hodapp

  Are there any free audio players that I can use in my website? Are they customizable? I've heard of Soundmanager 2. It's a flash based player with a javascript front-end. Are there any other free players like that?

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• Doing a loop on android (Audio)

  - by James Rattray

  I have a track I want to play 'megadeth', i'm calling it by... final MediaPlayer mp = MediaPlayer.create(this, R.raw.megadeth); And playing it by using 'mp.start' And I just want to know, how can I get this audio mp3 to loop? -Can you give me the code? Thanks alot,

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• Ruby: play, pause, resume aac (audio) files

  - by rahul

  I need to play, pause and resume AAC (audio) files from a ruby console program (much like iTunes or any music player). After much searching, I've come across these libraries: mp3info metadata id3lib-ruby rvideo (uses ffmpeg) These seem to help me in getting track length and tags which i also need, but I need something to play AAC (at least) and if possible other formats. I also must be able to pause and resume (so shelling a program like mpg321 is out).

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• Play audio file on hover

  - by powtac

  What is the best solution to play an audio file on mouse over via JavaScript? And stop it when the mouse leaves the link. jQuery is available. <a href="/test.mp3" class="play">play</a>

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• Android: Playing an audio clip onClick

  - by fordays

  How do I set up an audiofile to play when a user touches an image. Where should I store the audio file and what code should I use to actually play the file? I don't want to bring up the MediaPlayer interface or anything like that. I was thinking of doing it like this: foo = (ImageView)this.findViewById(R.id.foo); foo.setOnClickListener(this); public void onClick(View v) { if (foo.isTouched()) { playAudioFile(); } } Thanks

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• Play audio url on windows mobile

  - by Thyphuong

  I'm going to write a function to play a mp3 file from an URL on Windows Mobile without downloading all the stream to mobile. I read some documentation and faced some problem that. Using NAudio.dll : The dll is not compatible for Windows Mobile Using DirectShowLib.dll : have not found way to get from audio stream. Is there any way or any dll else to help me?

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• What happens if I don't handle audio interruptions?

  - by mystify

  Is it possible to still play sound / music even if audio has been interrupted, or more precisely: even if MyInterruptionListener got called from the OS with the interruption state kAudioSessionBeginInterruption ? Yeah I know that's not good idea to do. But want to know anyways.

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• How can I calcute audio dB level ?

  - by DYH1919

  I want calcute room noise level with computer's microphone,I record noise as an audio file,but how can I calcute the noise dB level? I don't know how start!

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• Audio processing libraries for Ruby?

  - by J. Pablo Fernández

  Any recommendation on libraries to do audio processing in Ruby. I need to do the following two tasks: Find silences, for which I'm happy to just be able to iterate over each sample in the wave. Cut and paste pieces of wav files to form a new wav file. Convert wav to mp3, which I will probably leave to lame anyway. I'm looking for the equivalent of NAudio, a C# library.

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• All Audio frequencies.

  - by TGadfly

  How can I get(Is it possible?) all audio frequencies are now playing in the system for writing some sound visualizer? Is there any library c++ or c#? Thanks in advance

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• iPhone Audio Effects

  - by Undolog

  Hello, I'm searching for Library, Framework or SDK for add audio effects in Objective-C, like reverber, echo etc... Somebody knowns something?

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• Audible Audio (.aa) file spec?

  - by Adam

  Does anyone know of a good resource on the Audible Audio (.aa) file spec? I'm trying to write a program that can use them, if no one knows of a resource, any tips on reverse engineering the spec my self? I opened it up in a Hex editor and poked around, looks like an MP3 but with a ton more header info.

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• same flash file (.swf) downloaded multiple times on a page

  - by Gunjan

  I have a page that has a table with each row corresponding to an audio file. The last cell in each row embeds a simple flash audio player. The problem is that the flash file for the player is being downloaded for each row separately and as soon as rows go beyond 40-50 it crashes the browser. I tried using different players (1pixelout, flash-mp3-player) and the problem is still there, so its not a player specific issue. Is there any way to cache the player so that it is only downloaded once?

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• Is Objective C fast enough for DSP/audio programming

  - by morgancodes

  I've been making some progress with audio programming for iPhone. Now I'm doing some performance tuning, trying to see if I can squeeze more out of this little machine. Running Shark, I see that a significant part of my cpu power (16%) is getting eaten up by objc_msgSend. I understand I can speed this up somewhat by storing pointers to functions (IMP) rather than calling them using [object message] notation. But if I'm going to go through all this trouble, I wonder if I might just be better off using C++. Any thoughts on this?

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• C# Audio - How to time stretch (different tempo, same pitch)

  - by heath

  I'm trying to make a winform app in C# (VS2008) that can load an mp3 (other formats would be nice, but mp3 at a minimum) and be able to adjust the playback speed (tempo) without affecting pitch. I really don't need any other audio effects. I tried using DirectShow but that doesn't seem to offer time stretch capabilities. I was able to incorporate irrklang but that does not seem to have the time stretch capability either. So now I've moved on to SoundTouch. That certainly has the capabilities but I'm very unclear on how to implement in C#. After a few days of this, about all I've accomplished is using DLLImport on the SoundTouch DLL and am able to successfully retrieve a version number. At this point, I'm not even sure if I can do what I'm trying to do with SoundTouch. Can anyone offer some guidance either on how to implement SoundTouch or a different library with the capabilities that I'm looking for? Thank you.

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• Ruby/Rails Audio Conversion Plugins?

  - by coneybeare

  I am looking for a good gem/plugin to convert user-uploaded audio files to different formats. One format in particular that I am interested in is converting to Apple .caf with ima4 compression for inclusion in an iPhone app. I have been using afconvert on my mac for this so far, but I need to do it on my linux box, server-side. Ideally, I would be able to work into paperclip. As an additional solution, ffmpeg could work, but I have not seen any .caf options for it. Anybody know of one?

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• Downsampling and applying a lowpass filter to digital audio

  - by twk

  I've got a 44Khz audio stream from a CD, represented as an array of 16 bit PCM samples. I'd like to cut it down to an 11KHz stream. How do I do that? From my days of engineering class many years ago, I know that the stream won't be able to describe anything over 5500Hz accurately anymore, so I assume I want to cut everything above that out too. Any ideas? Thanks. Update: There is some code on this page that converts from 48KHz to 8KHz using a simple algorithm and a coefficient array that looks like { 1, 4, 12, 12, 4, 1 }. I think that is what I need, but I need it for a factor of 4x rather than 6x. Any idea how those constants are calculated? Also, I end up converting the 16 byte samples to floats anyway, so I can do the downsampling with floats rather than shorts, if that helps the quality at all.

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