Can any one tell me how to stream video using mac osX , i need to write an application in mac os for video conferencing please let me know any prerequisites for making this application and what shud i learn for this .
Thanks in advance .
Do you need to do streaming or two-way videoconferencing? The latter is orders of magnitude harder than the former. If you just need streaming (one server, many clients), then QuickTime Broadcaster will do what you want.
Some time ago I used libcurl to stream a video from youtube, libavcodec (from ffmpeg) to decode and parse the data into frames and finally SDL to display it on my Mac OS X.
If you are looking for ffmpeg/SDL code examples, you must check this out:
http://dranger.com/ffmpeg/tutorial02.html
Based on your comment to Josh Wolf, you might want to consider developing an Adobe AIR application (inherently flash, but via whichever OSes you choose), as it already has built-in components for capturing and streaming video.
There's a great alternative for using this kind of service: tinychat.com
You can create a private room there and tell the password only for the people you need to talk to. The best reason for using tinychat.com is that you don't need to install anything.. It does works very well and quickly, and suports 9 broadcasts at the same time, with webcam, audio and/or text chat.
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I have been working with CoreAudio last couple of days and I'm able to access all the AudioDevices, their properties and receive notifications when something changes. However, I'm now struggling to "intercept" the audio (ideally before it is played) from any application in the mac. I wasn't sure it was possible but this app actually does it.
So I'm in search of some guidance. Thank you in advance.
Unfortunately macOS provides no facility to do this.
The only way to achieve this is to patch lower level frameworks and/or drivers like Audio Hijack does. I will be a messy process.
Depending on the use case however it might suffice to have an audio loopback virtual audio device so application A can send audio into it while application B can receive the audio from it. This can be done by creating a Core Audio AudioServerPlugin which is a user space audio driver mechanism. For an example please have a look at:
https://github.com/ExistentialAudio/BlackHole
https://github.com/kyleneideck/BackgroundMusic
In regards to the limitations, you can read more about it here:
https://stackoverflow.com/a/18595698/2576876
From there you can go in a lot of directions by following the links provided.
Can anybody give me a link to a working example of playing background live-streaming audio in Window Phone 7 (or 7.1)? I saw a lot of examples (in microsoft.com too) and noone of them works correctly for playing a background live-streaming audio.
FYI, here's an url of live-streaming audio http://radiozetmp3-02.eurozet.pl:8400/
Background audio is not supported on 7.0, only 7.1 (and above).
If you want to play streaming audio in a format/codec which is not natively supported by the phone you must do it with an AudioStreamingAgent. If it is a supported codec, you can use an AudioPlayerAgent (see sample here).
Using an AudioStreamingAgent is a nontrivial task and requires a deep understanding of the codec you need to play so you can convert it to something the phone understands. I know of one person who did this, for a H.264 stream, and it took a long time and much hair pulling to get it working. And before anyone asks: No, they are not able to share code from that project.
If you really must go down this route, the ManagedMediaHelpers (previously here) are a good place to start, but yes, they don't cover all codecs and this is, potentially, very complicated and not something well documented on the web.
Before reinventing the wheel, I'd better check out if there are solutions I can buy or get for free?
I want to make a little web radio streaming app for my sister. Maybe there's a library that can play streams from the web?
VLC is an open source player that can also be uses as a streamer
see also :
Which frameworks / libraries should I take a look at when I want to play an audio livestream on the iPhone?
You may want to check out wowza
Please advise a combination of server and client technologies, tools and frameworks to implement a solution that meets the following requirements?
File server in the network has a huge library of mp3/aac/aiff/wav music files
Desktop cocoa application accesses audio files using URLs: rtmp, http, rtsp+rtp, ftp — how to make a choice?
Audio content should be streamed and played with seeking (it's crucial) without downloading the entire file: QuckTime, AudioQueue, AudioFile, AudioStream, CFHTTP, All of them? — how to develop a client?
After solid research I've ended up with myriads of options and articles. But it looks like a half of them is quite out-of-date (2001—2005), and the other half is about universal code (pure C) for Mac OS X and iPhone OS.
However the main goal here is to write a Desktop music player for Mac OS 10.5.
I cannot believe that all this raw C-coding is just required.
No wrappers? No handy libraries? No components?
P. S. Research has resulted in the following combination: qt_tools for hinting + DSS for RTSP streaming + QTMovie for playing back + setCurrentTime: for seeking. This selection requires double-space for storing hinted .MOV-versions of every music file but works anyway.
I am not sure, but I believe you can use [QTMovie movieWithURL:url error:err] to stream a movie from a URL, then pass it to a QTMovieView object. QuickTime treats audio like movies, so it may work. Or it may try to load the entire file.
Have a look at the QuickTime streaming Guide
Did you look at VLC as a streaming solution?
I have a conundrum:
I need to find a way to capture the raw audio data that is being piped to the Built-in Output on Mac OS X. Core Audio, HAL, etc.
I can "listen" in on the Built-in Output and the mic, but neither of these appear to offer the correct data stream - the exact stream (all combined data from all input sources) that goes to the speakers/built-in output.
Any advice is welcomed with appreciation.
maybe you should have a look at the Jack source code...
http://sourceforge.net/projects/jackosx
Do you need to access to that stream from your program, or do you just want to rip audio from it? In the second case, a quick Google search turned up http://www.ambrosiasw.com/utilities/wiretap/ and http://www.rogueamoeba.com/audiohijackpro/. None of those are open-source or free though.
Edit -- whoops, you want to access to programmatically, that answers my own question, sorry. I think I'll keep my answer here in case some folks stumbles upon this page wanting to record audio non-programmatically.
You need will need your app to install a system extension.
Soundflower is an open-source implementation of such an extension.