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• how to lower CPU usage for Ableton Live 8 in Mac OSX 10.6.8

  - by Travis Dtfsu Crum

  While running Ableton Live 8 after a project gets to a certain size, the audio starts to get a bit choppy and distorted. My levels are fine and is not the cause of the lag and chop. I have samples set to 1024 and the high quality button selected which I need to hear the sound. I always lower these when I'm recording audio with my mic but I need to have these turned up to be able to mix master the song. Anything I can do to lower the CPU usage? It sucks because I can't even use my iZotope Ozone plug-ins because of their CPU usage and they are AMAZING plug-ins that I would love to use.

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• How can I apply a DSP to my microphone in windows?

  - by user16315

  I'd like to be able to run my microphone through arbitrary DSP filters--Mostly for compression and amplification, but also noise cancelation would be nice. I'd then like to take that output and put it back in a virtual audio device that I could use as input for skype, mumble, teamspeak, or any other VOIP program. With a program like Virtual Audio cable, I can do the 'fake devices' part but as far as I know it does not allow any kind of filtering inline. Does a program like this exist? Or some combination of programs that can be combined to accomplish this?

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• How do I record video to a local disk in AIR?

  - by Jim OHalloran

  I'm trying to record a webcam's video and audio to a FLV file stored on the users local hard disk. I have a version of this code working which uses NetConnection and NetStream to stream the video over a network to a FMS (Red5) server, but I'd like to be able to store the video locally for low bandwidth/flaky network situations. I'm using FLex 3.2 and AIR 1.5, so I don't believe there should be any sandbox restrictions which prevent this from occurring. Things I've seen: FileStream - Allows reading.writing local files but no .attachCamera and .attachAudio methids for creating a FLV. flvrecorder - Produces screen grabs from the web cam and creates it's own flv file. Doesn't support Audio. License prohibits commercial use. SimpleFLVWriter.as - Similar to flvrecorder without the wierd license. Doesn't support audio. This stackoverflow post - Which demonstrates the playback of a video from local disk using a NetConnection/NetStream. Given that I have a version already which uses NetStream to stream to the server I thought the last was most promising and went ahead and put together this demo application. The code compiles and runs without errors, but I don't have a FLV file on disk which the stop button is clicked. - <mx:Script> <![CDATA[ private var _diskStream:NetStream; private var _diskConn:NetConnection; private var _camera:Camera; private var _mic:Microphone; public function cmdStart_Click():void { _camera = Camera.getCamera(); _camera.setQuality(144000, 85); _camera.setMode(320, 240, 15); _camera.setKeyFrameInterval(60); _mic = Microphone.getMicrophone(); videoDisplay.attachCamera(_camera); _diskConn = new NetConnection(); _diskConn.connect(null); _diskStream = new NetStream(_diskConn); _diskStream.client = this; _diskStream.attachCamera(_camera); _diskStream.attachAudio(_mic); _diskStream.publish("file://c:/test.flv", "record"); } public function cmdStop_Click() { _diskStream.close(); videoDisplay.close(); } ]]> </mx:Script> <mx:VideoDisplay x="10" y="10" width="320" height="240" id="videoDisplay" /> <mx:Button x="10" y="258" label="Start" click="cmdStart_Click()" id="cmdStart"/> <mx:Button x="73" y="258" label="Stop" id="cmdStop" click="cmdStop_Click()"/> </mx:WindowedApplication> It seems to me that there's either something wrong with the above code which is preventing it from working, or NetStream just can't be abused in this wany to record video. What I'd like to know is, a) What (if anything) is wrong with the code above? b) If NetStream doesn't support recording to disk, are there any other alternatives which capture Audio AND Video to a file on the users local hard disk? Thanks in advance!

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• Convert swf file to mp4 file using FFMPEG

  - by user1624004

  I now want to show an html5 video on a html page. Now I have an sample.swf file, I want to convert it to .mp4 or .ogg or .webm file. I have tried: ffmpeg -i sample.swf sample.mp4 But I got this error: [swf @ 0000000001feef40] Could not find codec parameters for stream 0 (Audio: pcm_s16le, 5512 Hz, 1 channels, 88 kb/s): unspecified sample format Consider increasing the value for the 'analyzeduration' and 'probesize' options [swf @ 0000000001feef40] Estimating duration from bitrate, this may be inaccurate Guessed Channel Layout for Input Stream #0.0 : mono Input #0, swf, from 'sample.swf': Duration: N/A, bitrate: N/A Stream #0:0: Audio: pcm_s16le, 5512 Hz, mono, 88 kb/s Stream #0:1: Video: mjpeg, yuvj444p, 1024x768 [SAR 100:100 DAR 4:3], 16 fps, 16 tbr, 16 tbn File 'sample.mp4' already exists. Overwrite ? [y/N] y Invalid sample format '(null)' Error opening filters!

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• video streaming infrastructure advice

  - by Alchemical

  We would like to set-up a live video-chat web site and are looking for basic recomendations for software and hardware set-up. Most streams will be broadcast live from a single person with a web cam, etc., and viewed by typically 1-10 people, although there could be up to 100+ viewers on the high side. Audio and video do not have to be super-high quality, but do need to be "good enough". The main point is to convey the basic info in the video (and audio). If occasionally the frame-rate drops low and then goes back to normal fairly soon, we could live with that. Budget is an issue, so we are in general looking for a lower cost solution that will give us most of what we need in temers of performance and quality. We are looking at Peer1 for co-lo. The rest of our web site will be .Net / Windows platform. We are open to looking at any platform for the best streaming solution, although our technical expertise is currently more on the Windows side.

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• Problem with xvideoservice thief

  - by Nrew

  Xvideo service thief is an application that allows you to download and convert youtube videos into .avi format. The problem is when it tries to convert the .flv into a .avi. The audio in the video is not being played when you try to play the video. But the .flv works fine. I have also enabled Intel(R) speedstep feature in my processor(Pentium Dual core E5200) to decrease the power consumed by the processor with the help of Granola software. What might be the reason for the audio less video converter by xvideo service thief? Could it be the enabling of intel(R) speedstep? Because the software works fine when its not enabled. Is this possible?That the output some applications can be altered when enabling this processor feature?

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• How to read the statistics in Media Player Classic?

  - by netvope

  I understand that the two numbers under bitrate are the average bitrate and the current bitrate of the stream. But what are the two numbers under buffers? I suppose the second one is the amount of data loaded in memory, but what is the first number? The amount of data decoded? Also, why are there a jitter and a sync offset? (For your reference, here stream 0-6 are video, audio track 1, audio track 2, subtitle track 1 and subtitle track 2.)

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• 3.5mm headphone jack -> Component video?

  - by Isaac Waller

  Hello, I have a strange cord that has a male 3.5mm headphone jack on one side, and some component video and audio ouputs on the other. When I plug the headphone side into my computer, and the other side into my TV, I get audio across the cable, but no video. How can I send some video over the headphone jack in OS X? I know you can, because this cable is actually for a Beyblade toy and it somehow transferred video over this cable. Thanks, Isaac I think I found some more information (from Wikipedia:) "A four conductor version (of a 3.5mm headphone jack) is becoming a de facto standard output connector for compact camcorders, providing stereo sound plus a video signal." So how can I do this on Mac?

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• Local Live Quicktime Video Broadcast, latency?

  - by Snowwire

  I'm looking into the feasibility of using a local server to distribute live video of a conference to delegates in the same room. They would still hear the live audio coming from the speaker, so only the video would be streamed. I was considering a Darwin Steaming Server (a lot of iPhone users to support) and encoding with H.264. My main concern is latency across the network. Even with everything running locally, would there be lip sync issues between the live audio and the 'live' video stream? It feels like there will be problems given the encoding, broadcasting, decoding to be completed, but I've never done any like this before so thought I would check. Thanks

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• How to Configure a vm on the same machine to do remote desktop [closed]

  - by Varun K

  I want to achieve following: (Note I'd like to get this done first of all with Win7 as both host and vm OS) Install Windows 7/xp/Windows 8 VM on Windows 7/Windows 8 host machine Configure it so that I can connect to it via remote desktop. This is because I use a screen reader software and audio output directly from VMs is not highly responsive. My software has a feature that it can connect to its copy on the remote machine (during rdp session) and then start receiving the text description which it translates into audio on the client (host in this case) machine. I want to know: Which VM software can let me do this – VMWare/Ms Virtual PC or VirtualBox If it is possible with every VM software, could you give an example of how to do this with anyone of these 3? Specifically, I know how to install Windows on VM (on both VMWare/Virtual PC), but don't really know how to configure a network such that I can remote into that VM from host OS. Hope it clarifies what I'm trying to achieve.

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• Simple database design and LINQ

  - by Anders Svensson

  I have very little experience designing databases, and now I want to create a very simple database that does the same thing I have previously had in xml. Here's the xml: <services> <service type="writing"> <small>125</small> <medium>100</medium> <large>60</large> <xlarge>30</xlarge> </service> <service type="analysis"> <small>56</small> <medium>104</medium> <large>200</large> <xlarge>250</xlarge> </service> </services> Now, I wanted to create the same thing in a SQL database, and started doing this ( hope this formats ok, but you'll get the gist, four columns and two rows): > ServiceType Small Medium Large > > Writing 125 100 60 > > Analysis 56 104 200 This didn't work too well, since I then wanted to use LINQ to select, say, the Large value for Writing (60). But I couldn't use LINQ for this (as far as I know) and use a variable for the size (see parameters in the method below). I could only do that if I had a column like "Size" where Small, Medium, and Large would be the values. But that doesn't feel right either, because then I would get several rows with ServiceType = Writing (3 in this case, one for each size), and the same for Analysis. And if I were to add more servicetypes I would have to do the same. Simply repetitive... Is there any smart way to do this using relationships or something? Using the second design above (although not good), I could use the following LINQ to select a value with parameters sent to the method: protected int GetHourRateDB(string serviceType, Size size) { CalculatorLinqDataContext context = new CalculatorLinqDataContext(); var data = (from calculatorData in context.CalculatorDatas where calculatorData.Service == serviceType && calculatorData.Size == size.ToString() select calculatorData).Single(); return data.Hours; } But if there is another better design, could you please also describe how to do the same selection using LINQ with that design? Please keep in mind that I am a rookie at database design, so please be as explicit and pedagogical as possible :-) Thanks! Anders

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• Finding C++ static initialization order problems

  - by Fred Larson

  We've run into some problems with the static initialization order fiasco, and I'm looking for ways to comb through a whole lot of code to find possible occurrences. Any suggestions on how to do this efficiently? Edit: I'm getting some good answers on how to SOLVE the static initialization order problem, but that's not really my question. I'd like to know how to FIND objects that are subject to this problem. Evan's answer seems to be the best so far in this regard; I don't think we can use valgrind, but we may have memory analysis tools that could perform a similar function. That would catch problems only where the initialization order is wrong for a given build, and the order can change with each build. Perhaps there's a static analysis tool that would catch this. Our platform is IBM XLC/C++ compiler running on AIX.

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• How do you measure latency in low-latency environments?

  - by Ajaxx

  Here's the setup... Your system is receiving a stream of data that contains discrete messages (usually between 32-128 bytes per message). As part of your processing pipeline, each message passes through two physically separate applications which exchange the data using a low-latency approach (such as messaging over UDP) or RDMA and finally to a client via the same mechanism. Assuming you can inject yourself at any level, including wire protocol analysis, what tools and/or techniques would you use to measure the latency of your system. As part of this, I'm assuming that every message that is delivered to the system results in a corresponding (though not equivalent) message being pushed through the system and delivered to the client. The only tool that I've seen on the market like this is TS-Associates TipOff. I'm sure that with the right access you could probably measure the same information using a wire analysis tool (ala wireshark) and the right dissectors, but is this the right approach or are there any commodity solutions that I can use?

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• Can I ask Postgresql to ignore errors within a transaction

  - by fmark

  I use Postgresql with the PostGIS extensions for ad-hoc spatial analysis. I generally construct and issue SQL queries by hand from within psql. I always wrap an analysis session within a transaction, so if I issue a destructive query I can roll it back. However, when I issue a query that contains an error, it cancels the transaction. Any further queries elicit the following warning: ERROR: current transaction is aborted, commands ignored until end of transaction block Is there a way I can turn this behaviour off? It is tiresome to rollback the transaction and rerun previous queries every time I make a typo.

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• Free recorder for MacOSX with system sound

  - by Jonathan

  Is there a free screen for MacOSX that records the audio that you hear out the speakers as well. With no watermarks

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• Get highest frequency terms from Lucene index

  - by Julia

  Hello! i need to extract terms with highest frequencies from several lucene indexes, to use them for some semantic analysis. So, I want to get maybe top 30 most occuring terms(still did not decide on threshold, i will analyze results) and their per-index counts. I am aware that I might lose some precision because of potentionally dropped duplicates, but for now, lets say i am ok with that. So for the proposed solutions, (needless to say maybe) speed is not important, since I would do static analysis, I would put accent on simplicity of implementation because im not so skilled with Lucene (not the programming guru too :/ ) and cant wrap my mind around many concepts of it.. I can not find any code samples from something similar, so all concrete advices (code, pseudocode, links to code samples...) I will apretiate very much!!! Thank you!

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• sound clipping in windows 7 64bit

  - by Sonic Soul

  something is up with 64 bit version of windows 7. i have 2 (good pro-sumer) sound cards which i've used in other version of windows 7 w/out problems, but now it is causing severe clipping (noise, sound having little gaps surrounded by static).. the cards i am using is echo mia, and native instruments audio kontrol 1. the audio kontrol 1 is a external card, and would work ok for a few hours after rebooting, and than it would go back into clipping mode, to the point where you tube videos would not play from trying to process sound and it stopping for extended periods of time. echo mia is performing better, but there is still some clipping and distortion. the machine i use is newly built, with i7 920 64 bit cpu, 6 gigs of ram and an outdated nvidia video card (geforece 7950 gx2)

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• Free MPEG cutting/cropping/editing tool

  - by Stijn Sanders

  I'm looking for a free tool to cut MPEG's that are created by recording from a USB cable receiver. There are a number of applications that do this, and some are free, but most of them take the video and audio decoded and pass them into a codec again to write the final output. I already have the MPEG's encoded the way I like, so what I need is a tool that can strip the beginning and the ending of the recording before and optionally commercial breaks, by rearranging the data within the file, not re-encoding it. Now I'm using some old software that came with the cable-receiver, but this actually re-encodes the video when exporting. I've tried VirtualDub but had major trouble getting the audio and video streams to stay in sync (and this was also re-encoding)... I found this which comes pretty close, but doesn't allow much accuracy in selecting cut positions.

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• How to get LAN ip to a variable in a Windows batch file

  - by Ville Koskinen

  I'm streaming audio from my Windows 7 laptop to a sound card attached to a router. I have a little batch script to start streaming. REM Kill any instances of vlc taskkill /im vlc.exe "c:\Program Files\VideoLAN\VLC\vlc.exe" <parameters to start http streaming> REM Wait for vlc TIMEOUT /T 10 REM start playback on router plink -ssh [email protected] -pw password killall -9 madplay plink -ssh [email protected] -pw password wget -q -O - http://192.1.159:8080/audio | madplay -Q --no-tty-control - & As you see the http stream is hard coded. It would be nice to get the address dynamically to reuse the script on other machines. Any ideas?

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• Bluetooth HSP on XP?

  - by joeforker

  Can the Windows XP builtin bluetooth stack support HSP (headsets) as an extra audio device, without third-party drivers?

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• GIS: When and why to use ArcObjects over GDAL programming to work with ArcGIS rasters and vectors?

  - by anotherobject

  Im just starting off with GDAL + python to support operations that cannot be done with ArcGIS python geoprocessing scripting. Mainly I am doing spatial modeling/analysis/editing of raster and vector data. I am a bit confused when ArcObject development is required versus when GDAL can be used? Is there functionality of ArcObjects that GDAL does not do? Is the opposite true too? I am assuming that ArcObjects are more useful in developing online tools versus Desktop analysis and modeling where the difference is more to do with preference? In my case i prefer GDAL because of python support, which I believe ArcObjects lack. thanks!

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• Data Mining open source tools

  - by Andriyev

  Hi I'm due to take up a project which is into data mining. Before I jump in I wanted to probe around for different data mining tools (preferably open source) which allows web based reporting. In my scenario the all the data would be provided to me, so I'm not supposed to crawl for it. In n nutshell, am looking for a tool which does - Data Analysis, Web based Reporting, provides some kind of a dashboard and mining features. I have worked on the Microsoft Analysis Services and BOXI and off late I have been looking at Pentaho, which seems to be a good option. Please share your experiences on any such tool which you know of. cheers

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• Extract MP3 URL from a SWF file

  - by Charles

  I have a SWF file that basically shows a streamer, and it plays a song (I'm guessing it's MP3) that it links to, somewhere. I know the audio isn't embedded in the file since the SWF's file size is ~370KB. With most flash FLV and MP3 players, Internet Download Manager catches the URL as soon as the video/audio starts to load, and I can easily download it using IDM. In this case, IDM doesn't seem to sense anything - so I thought maybe I could extract the MP3 location myself. I tried decompiling the SWF file, as I'd heard before that with some files, decompiling can help in breaking down a file and getting just the info you need - but I honestly don't know what to look for in this particular file. Suggestions?

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• Bluetooth HSP support on Windows XP without third-party drivers

  - by joeforker

  Can the Windows XP built-in Bluetooth stack support HSP (headset profile) as an extra audio device, without third-party drivers?

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• Volume display for laptop missing after driver update

  - by Cyclone

  I have a Dell Inspiron 1520, and I just updated my audio drivers to be able to use Stereo Mix. It's a SigmaTel audio driver. Prior to the update, whenever I used the hardware buttons to update volume or mute/unmute speakers, it would always have a nice display like this one: But, for volume instead of screen brightness. The hardware buttons still work fortunately, but the volume display is gone. Is there a place I can configure this setting and re-enable it? The speaker icon in task tray was also disabled with the update, but I re-enabled that from the Control Panel. Is this simply gone with the driver update? Thanks for the help!

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