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Sur d’autres sites (7990)

  • Convert video of any format to mp4 using php and ffmpeg

    4 juillet 2012, par Chithri Ajay

    After doing some online searches, I found out that ffmpeg is the best way to convert any video format to mp4. How can I install the ffmpeg and ffmpeg-php extensions on my dedicated server ?

  • iPAD Streaming video to a ffmpeg server. front facing camera

    6 décembre 2011, par IrishGringo

    This is a video chat type program.
    My project is to write a native ObjC app that will stream video from the front facing camera to a server. This server will format and relay to be sent to another location.
    In a related question, I want to display video streaming from the server. The video server will probably be running ffmpeg for formating.
    But this question is just asking advice for the iPAD project. I wanted to get comments about issues I need to be thinking about.

    This is my strategy :
    I was thinking of using AVFoundation framework to stream from the cam to a URL server. I don't know if I will be formatting on the client or no, so some comment there would be interesting. http://developer.apple.com/library/mac/#documentation/AVFoundation/Reference/AVFoundationFramework/_index.html

    For streaming the video, I was going to be using :
    http://developer.apple.com/library/IOs/#documentation/AVFoundation/Reference/AVCaptureSession_Class/Reference/Reference.html#//apple_ref/occ/cl/AVCaptureSession

    so if someone has some ideas/suggestions... extra code I can look at. I would appreciate it.

  • Recommendations for real-time pixel-level analysis of television (TV) video

    6 décembre 2011, par Randall Cook

    [Note : This is a rewrite of an earlier question that was considered inappropriate and closed.]

    I need to do some pixel-level analysis of television (TV) video. The exact nature of this analysis is not pertinent, but it basically involves looking at every pixel of every frame of TV video, starting from an MPEG-2 transport stream. The host platform will be server-class, multiprocessor 64-bit Linux machines.

    I need a library that can handle the decoding of the transport stream and present me with the image data in real-time. OpenCV and ffmpeg are two libraries that I am considering for this work. OpenCV is appealing because I have heard it has easy to use APIs and rich image analysis support, but I have no experience using it. I have used ffmpeg in the past for extracting video frame data from files for analysis, but it lacks image analysis support (though Intel's IPP can supplement).

    In addition to general recommendations for approaches to this problem (excluding the actual image analysis), I have some more specific questions that would help me get started :

    1. Are ffmpeg or OpenCV commonly used in industry as a foundation for real-time
      video analysis, or is there something else I should be looking at ?
    2. Can OpenCV decode video frames in real time, and still leave enough
      CPU left over to do nontrivial image analysis, also in real-time ?
    3. Is sufficient to use ffpmeg for MPEG-2 transport stream decoding, or
      is it preferable to just use an MPEG-2 decoding library directly (and if so, which one) ?
    4. Are there particular pixel formats for the output frames that ffmpeg
      or OpenCV is particularly efficient at producing (like RGB, YUV, or YUV422, etc) ?

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