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  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • Participer à sa traduction

    10 avril 2011

    Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
    Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
    Actuellement MediaSPIP n’est disponible qu’en français et (...)

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

Sur d’autres sites (21130)

  • Latch-Based Performance Optimization for Field-Programmable Gate Arrays [on hold]

    22 mars 2014, par user3448912

    how can i replace the flip-flops in fpga by pulsed latches ?i tried that with howard algorithm by writing the verilog code for that.i have to take the area and power analysis.which synopsis tool is useful ?i am getting the timing report from xilinx.

  • Configure ffmpeg for wowza and wp8

    11 octobre 2013, par Anton Shakalo

    I have mp4 file from my windows phone.

    There is info :

    General
    
Format                                   : MPEG-4
    
Format profile                           : Base Media / Version 2
    
Codec ID                                 : mp42
    

    
Video
    
Format                                    : AVC
    
Codec ID                                 : avc1
    
Codec ID/Info                           : Advanced Video Coding
    

    
Audio
    
Format                                    : AAC
    
Format profile                           : LC
    
Codec ID                                 : 40
    
Bit rate                                   : 96.0 Kbps
    
Sampling rate                           : 44.1 KHz

    When I stream it to wowza with next ffmpeg command ( I got it from documentation)

    ffmpeg -re -i "C:\sample2.mp4"  -vcodec libx264  -vb 150000 -g 60 -vprofile main -level 2.1 -acodec aac -ab 64000 -ar 48000 -ac 2 -vbsf h264_mp4toannexb  -f mpegts udp://127.0.0.1:10001?pkt_size=1316

    In client app I see corrupted video : http://i.imgur.com/fKEMlsB.png

    With sample file provided by wowza streamed video looks fine.

    There is info about sample file from wowza :

    General
    
Format                                   : MPEG-4
    
Format profile                           : QuickTime
    
Codec ID                                 : qt  
    

    
Video
    
Format                                   : AVC
    
Format profile                           : Baseline@L3.0
    
Codec ID                                 : avc1
    

    
Audio
    
Format                                   : AAC
    
Format profile                           : LC
    
Codec ID                                 : 40

    Can you help me with ffmpeg configuring ?
    I read documentation, but understand nothing.

  • JavaCV FFmpegFrameRecorder properties explanation needed

    29 décembre 2014, par Leron

    I’m using FFmpegFrameRecorder to get the video input from my webcam and record it into a video file. The problem is that I’m building my application using a few different demo source codes that I found and I use properties some of which are not completely clear to me.

    First, here is my code snippet :

    FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(FILENAME,  grabber.getImageWidth(),grabber.getImageHeight());
    

    
        recorder.setVideoCodec(13);
    
        recorder.setFormat("mp4");
    
        recorder.setPixelFormat(avutil.PIX_FMT_YUV420P);
    
        recorder.setFrameRate(30);
    
        recorder.setVideoBitrate(10 * 1024 * 1024);
    

    
        recorder.start();
    • setVideoCodec(13) - What is the meaning of this (13) how can I understand what actual codec stands behind any number ?
    • setPixelFormat - Just get this, don’t know what it’s doing in general
    • setFrameRate(30) - I think this should be pretty clear but still what is the logic behind what frame rate we choose (isn’t the high the better ?)
    • setVideoBitrate(10*1024*1024) - again almost no idea what this does and what’s the logic behind the numbers ?

    At the end I just want to mention one last problem that I get recording video like this. If the actual length of the video is let’s say 20secs. When I play the video file created from the program it runs significantly faster. Can’t tell if it’s exactly 2 times faster than it should be but in general if I record a 20sec video then it’s played for about 10secs. What may cause this and how can I fix it ?

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