Search Results

Search found 9901 results on 397 pages for 'audio processing'.

Page 85/397 | < Previous Page | 81 82 83 84 85 86 87 88 89 90 91 92  | Next Page >

• Python frequency detection

  - by Tsuki

  Ok what im trying to do is a kind of audio processing software that can detect a prevalent frequency an if the frequency is played for long enough (few ms) i know i got a positive match. i know i would need to use FFT or something simiral but in this field of math i suck, i did search the internet but didn not find a code that could do only this. the goal im trying to accieve is to make myself a custom protocol to send data trough sound, need very low bitrate per sec but im also very limited on the transmiting end so the recieving software will need to be able custom (cant use an actual hardware/software modem) also i want this to be software only (no additional hardware except soundcard) thanks alot for the help.

  Read the article

• iPhone SDK SDL_openAudio with Multitasking Support

  - by brokedid

  Hello, I'm playing audio from a Online Live RTPS Stream with ffmpeg(because Apple doesn't support rtsp live streaming). Now I would play my Stream in the background. I started a thread in the background and registered the music for Background support. When the Application is entering in Background the NSThread is paused, and then Resuming after returning from background. If I start playing a Music (MP3-Stream) in the Application which use official Apple Frameworks then when the App is entering Background both Streams are played. What can I do to fix this?

  Read the article

• Image analysis on the iPhone

  - by user362808

  Hi, guys! Hopefully a quick one. Working on a devious little algorithm that'll automatically scan a user's iPhone for a photo of some emotional poignance (e.g. go back in time a ways, look for one of a group of photos that are proximally timestamped, etc.). Need a quick-and-dirty way of picking out a photo containing two people in close proximity to each other. I know that the OpenCV Python lib [for image processing] works on the iPhone, I'm just curious whether it's actually the best way of doing this (from scratch or otherwise). Cheers!

  Read the article

• Take advantage of multiple cores executing SQL statements

  - by willvv

  I have a small application that reads XML files and inserts the information on a SQL DB. There are ~ 300 000 files to import, each one with ~ 1000 records. I started the application on 20% of the files and it has been running for 18 hours now, I hope I can improve this time for the rest of the files. I'm not using a multi-thread approach, but since the computer I'm running the process on has 4 cores I was thinking on doing it to get some improvement on the performance (although I guess the main problem is the I/O and not only the processing). I was thinking on using the BeginExecutingNonQuery() method on the SqlCommand object I create for each insertion, but I don't know if I should limit the max amount of simultaneous threads (nor I know how to do it). What's your advice to get the best CPU utilization? Thanks

  Read the article

• List of uninteresting words

  - by Hooked

  [Caveat] This is not directly a programing question, but it is something that comes up so often in language processing that I'm sure it's of some use to the community. Does anyone have a good list of uninteresting (English) words that have been tested by more then a casual look? This would include all prepositions, conjunctions, etc... words that may have semantic meaning, but are often frequent in every sentence, regardless of the subject. I've built my own lists from time to time for personal projects but they've been ad-hoc; I continuously add words that I forgotten as they come in.

  Read the article

• Background subtracting in MATLAB

  - by eiphyomin

  I'm looking to do background subtracting on an image. I'm new to MATLAB and new to image processing/analysis, so sorry if any of this sounds stupid. 1) Other than imsubtract() are there other ways to do background subtracting (besides comparing one image to another)? 2) In the Math Works explanation for imsubtract() why do they make their structuring element a disk? This seems rather difficult so far because every time I try something, I end up not only subtracting the noisy background but also losing the parts of the image I want to look at!

  Read the article

• How to replicate Google "Hangouts On Air" stream combining functionality?

  - by Rob Olmos

  I've been researching this one for quite a bit but haven't found any solid leads. I have a Wowza/Flash app with video chatroom functionality and would like to combine the streams server-side into one video/audio stream in order to be sent to a live Youtube channel. I've found a couple projects such as jMixer and some helpful keywords such as "vision mixer" to help with my search but looking for any previous experience or new ideas. The other option is building something like it myself with a commercial video decoding/encoding library to raw frames, stitching the frames together, then encoding it. I was originally going down this route but put project on hold. What are some ideas, keywords, or existing software (open source preferred) to take those live streams and combine them into one in real-time? Or is coding it myself the required route? Thanks!

  Read the article

• Forcing a mixed ISO-8859-1 and UTF-8 multi-line string into UTF-8 in Perl

  - by knorv

  Consider the following problem: A multi-line string $junk contains some lines which are encoded in UTF-8 and some in ISO-8859-1. I don't know a priori which lines are in which encoding, so heuristics will be needed. I want to turn $junk into pure UTF-8 with proper re-encoding of the ISO-8859-1 lines. Also, in the event of errors in the processing I want to provide a "best effort result" rather than throwing an error. My current attempt looks like this: $junk = &force_utf8($junk); sub force_utf8 { my $input = shift; my $output = ''; foreach my $line (split(/\n/, $input)) { if (utf8::valid($line)) { utf8::decode($line); } $output .= "$line\n"; } return $output; } While this appears to work I'm certain this is not the optimal solution. How would you improve the force_utf8(...) sub?

  Read the article

• What Is Causing The Humming Sound On My Website?

  - by Draven Vestatt

  I've noticed this on a handful of websites on the web. Sometimes there will be a low humming sound, that doesn't increase or decrease with volume. I've searched the web, and I can't find anything addressing it. My website that I've working on(still under construction): http://nottheactualaddress.com Do you hear a low humming sound? The audio is low even if you turn up your volume. If so, what do you think is causing it? It's driving me crazy...

  Read the article

• Can I play any Buffer only once at a given time?

  - by mystify

  From the OpenAL documentation: The basic OpenAL objects are a Listener, a Source, and a Buffer. There can be a large number of Buffers, which contain audio data. Each buffer can be attached to one or more Sources My problem is, that I have one sound file which I need to play multiple times per second, at the same time. The sound is 2 seconds long. So it will overlap. Would I need multiple filled buffers for this (= multiple times that sound in memory)? If I would attach one Buffer to multiple Sources, would I be able to play the sound 10 times, overlapping itself, with just one copy in memory? Or would I still have to deal with 10 copies of that sound in memory?

  Read the article

• How would you find the height of objects given an image?

  - by Ram Bhat

  Heyguys.. This isn't exactly a programming question exactly. I just want to know what your approach would be to a common problem in Digital image processing. Lets say you have an image of a a few trees in say jpg format. How would you go about finding the heights of each of these trees. The photo is the only input you have. I want to know the approaches you have not code. So it doesnt matter if your answers are vague, or non DIP-ish.

  Read the article

• Stuggling with webkit-transition in javascript

  - by Mungbeans

  I've tried a few variations of using webkit-transition that I've found from googling but I've not been able to get any to work. I have some audio controls that I make appear on a click event, they appear suddenly and jerky so I want to fade them in. The target browser is iOS so I am trying webkit extensions. This is what I currently have: <div id = "controls"> <audio id = "audio" controls></audio> </div> #controls { position:absolute; top: 35px; left:73px; height: 20px; width: 180px; display:none; } #audio { opacity:0.0; } audio.src = clip; audio.addEventListener('pause', onPauseOrStop, false); audio.addEventListener('ended', onPauseOrStop, false); audio.play(); audioControls.style.display = 'block'; audio.style.setProperty("-webkit-transition", "opacity 0.4s"); audio.style.opacity = 0.7; The documentation for webkit-transition says it takes effect on a change in the property, so I was assuming changing style.opacity in the last line would kick it off. The controls appear with an opacity of 0.7 but I want it to fade in and that animation isn't happening. I also tried this: #audio { opacity:0.0; -webkit-transition-property: opacity; -webkit-transition-duration: 1s; -webkit-timing-function: ease-in; } Also tried audio.style.webkitTransition = "opacity 1.4s"; from this posting How to set CSS3 transition using javascript? I can't get anything to work, I'm testing on iOS, Safari desktop and Chrome. Same non result on all of them.

  Read the article

• Core Audio - CARIngBuffer

  - by tech74

  Hi, Im looking at using the CARingBuffer in iPhone SDK 3.1 Developer\Extras\CoreAudio\PublicUtility, however was a little puzzled about some of its methods. Firstly this will only make sense really to anyone who's used this class For example the GetTimebounds,SetTimeBounds, ClipTimeBounds functions what are these actually doing? Also when using it, i get crashes caused by example this method in the main Fetch method - ZeroABL(abl, 0, destStartOffset * mBytesPerFrame); CARingBufferError CARingBuffer::Fetch(AudioBufferList *abl, UInt32 nFrames, SampleTime startRead) { SampleTime endRead = startRead + nFrames; SampleTime startRead0 = startRead; SampleTime endRead0 = endRead; SampleTime size; CARingBufferError err = ClipTimeBounds(startRead, endRead); if (err) return err; size = endRead - startRead; SInt32 destStartOffset = startRead - startRead0; if (destStartOffset 0) { ZeroABL(abl, 0, destStartOffset * mBytesPerFrame); } Here the destStartOffset has become larger than the size of the abl Bufferlist so when a memset is done it exceeds the boundaries of the abl Bufferlist causing the crash. Why hasn't this class got checks in to prevent this.

  Read the article

• Audio Recording and Playback

  - by Siva

  Hi, I am new to iphone development. In my app, I want to record a voice and play the recorded voice. Now I am trying to do via speak here sample code, but i feel it is too hard to understand with AudioToolbox framework. Somebody saying AudioToolbox framework is too difficult to implement it. is there any other sample with other than AudioToolbox framework or which way is best to do that? Please help me!

  Read the article

• Audio looping in Objective-C/iPhone

  - by Neurofluxation

  So, I'm finishing up an iPhone App. I have the following code in place to play the file: while(![player isPlaying]) { totalSoundDuration = soundDuration + 0.5; //Gives a half second break between sounds sleep(totalSoundDuration); //Don't play next sound until the previous sound has finished [player play]; //Play sound NSLog(@" \n Sound Finished Playing \n"); //Output to console } For some reason, the sound plays once then the code loops and it outputs the following: Sound Finished Playing Sound Finished Playing Sound Finished Playing etc... This just repeats forever, I don't suppose any of you lovely people can fathom what could be the boggle? Cheers!

  Read the article

• detecting pauses in a spoken word audio file using pymad, pcm, vad, etc

  - by james

  First I am going to broadly state what I'm trying to do and ask for advice. Then I will explain my current approach and ask for answers to my current problems. Problem I have an MP3 file of a person speaking. I'd like to split it up into segments roughly corresponding to a sentence or phrase. (I'd do it manually, but we are talking hours of data.) If you have advice on how to do this programatically or for some existing utilities, I'd love to hear it. (I'm aware of voice activity detection and I've looked into it a bit, but I didn't see any freely available utilities.) Current Approach I thought the simplest thing would be to scan the MP3 at certain intervals and identify places where the average volume was below some threshold. Then I would use some existing utility to cut up the mp3 at those locations. I've been playing around with pymad and I believe that I've successfully extracted the PCM (pulse code modulation) data for each frame of the mp3. Now I am stuck because I can't really seem to wrap my head around how the PCM data translates to relative volume. I'm also aware of other complicating factors like multiple channels, big endian vs little, etc. Advice on how to map a group of pcm samples to relative volume would be key. Thanks!

  Read the article

• Audio Reminders

  - by abhishek mishra

  Hi , I am developing a reminder application. A part of it is to have voive notes as reminders. On click of voice notes button i want to start the inbuilt voice recorder. How do i go ahead for it ? Also once it starts i want to retrieve the path where it gets stored so that it can be played automatically on the day the timeline is reached. Is it possible ?

  Read the article

• HTML5 iPhone Safari Mobile visualize something rather than quicktime symbol when creating an audio t

  - by Antonio Murgia

  I'm writing a very simple webpage in html5 for iPhone. the page is this one Not Working Everything works but in the page from the iPhone i see the quicktime logo with a slash on it and if i tap on it the player shows up the play button and in the background there is the quicktime logo. is it possible to replace the logos with a personal image? thank you in advance.

  Read the article

• How to change default audio input device programatically

  - by f34r

  I am looking for a way to set/change default input device inside my application. I have several different recording devices and it is very anoying to go into the control panel and change default recording device. I was looking around and I did not find anything that could help me with the problem. Application is written in c# and it is targeted for Windows Vista / Windows 7.

  Read the article

• Synchronizing Java Visualizer Audio and Visual

  - by Matt

  I've run into a problem creating a visualizer for .mp3 files in Java. My goal is to create a visualization that runs in time with the .mp3 file being played. I can currently visualize an .mp3 OR play it, but not both at the same time. I am using libraries which may make this trickier than necessary. I currently: Read in the .mp3 as a FileInputStream. a) Convert the FileInputStream into a Bitstream and run the Visualizer OR b) Pass the FileInputStream to a library Play method where it converts it into a Bitstream, decodes it, and plays it. I am using the JLayer library to play and decode the .mp3. My question is: how do I synchronize the two actions so that I can run both at the same time AND they line up (so my visualizations correspond to the changing frequencies). This implies that they finish at the same time as well.

  Read the article

• Objective-C and Interfacebuilder with Audio

  - by Henry D'Andrea

  I want to make an app that has buttons that when pressed, plays a sound. How would I add the sounds, and then use the Line thing in IB to connect them to a button?

  Read the article

• AxWindowsMediaPlayer does not play audio/video from url ?

  - by Madhup

  HI, I am using activeXMediaPlayer to play files from url but each time I pass a url to it shows the message , "either the file is corrupted or player does not support the file format u are playing." But when i run the same url on browser the file is downloaded and this downloaded file can be played on the media player. I am not able to find out what the problem is . Because the same cod plays the local file and the downloaded files but not file from url Although the same code worked few months ago for the urls So is this my fault or some server related issues can affect this thing. Please help me I am in big trouble. Regards, Madhup

  Read the article

• Slider control for audio and video using jquery

  - by Geetha

  Hi All, Please anyone help me to create a slider control like this: http://www.protofunc.com/scripts/jquery/jmediaelement/demos/simple-controls-h264.html. Geetha.

  Read the article

• Audio/Voice Visualization

  - by Neurofluxation

  Hey you Objective-C bods. Does anyone know how I would go about changing (transforming) an image based on the input from the Microphone on the iPhone? i.e. When a user speaks into the Mic, the image will pulse or skew. Thanking you!!

  Read the article

• Audio while programming

  - by Tom Alderman

  Does listening to music (or podcasts, Internet radio, etc.) help a programmer be more or less productive? What do you listen to while programming?

  Read the article

< Previous Page | 81 82 83 84 85 86 87 88 89 90 91 92  | Next Page >