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    8 février 2011, par

    Par défaut, beaucoup de fonctionnalités sont limitées aux administrateurs mais restent configurables indépendamment pour modifier leur statut minimal d’utilisation notamment : la rédaction de contenus sur le site modifiables dans la gestion des templates de formulaires ; l’ajout de notes aux articles ; l’ajout de légendes et d’annotations sur les images ;

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    13 avril 2011, par

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  • Dépôt de média et thèmes par FTP

    31 mai 2013, par

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    Vous trouverez dès le départ les dossiers suivants dans votre espace FTP : config/ : dossier de configuration du site IMG/ : dossier des média déjà traités et en ligne sur le site local/ : répertoire cache du site web themes/ : les thèmes ou les feuilles de style personnalisées tmp/ : dossier de travail (...)

Sur d’autres sites (6813)

  • FFMPEG or FFPLAY, catch FFT signal in real time as floats

    25 avril 2021, par NVRM

    Looking to extract in real time a FFT snapshot of waveforms data with ffplay, in the view of creating animations.

    


    This is exactly what I am looking to catch, but this demo is using JavaScript in a browser. (Source own post)

    


    

    

    const audio = document.getElementById('music');
audio.load();
audio.play();

const ctx = new AudioContext();
const audioSrc = ctx.createMediaElementSource(audio);
const analyser = ctx.createAnalyser();

audioSrc.connect(analyser);
analyser.connect(ctx.destination);

analyser.fftSize = 256;
const bufferLength = analyser.frequencyBinCount;
const frequencyData = new Uint8Array(bufferLength);

setInterval(() => {
   analyser.getByteFrequencyData(frequencyData);
   console.log(frequencyData);
}, 1000);

    


    <audio src="http://strm112.1.fm/reggae_mobile_mp3" crossorigin="use-URL-credentials" controls="true"></audio>

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    &#xD;&#xA;&#xA;


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    I tried many variations around the method posted on https://trac.ffmpeg.org/wiki/Waveform .

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    enter image description here

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    The problem is the output format for FFT is PCM (Pulse Code Modulation), and not real time.

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    In a generic way, is there a simple way to do this, while the sound is playing, to retrieve this data ?

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    ffplay -fft file.mp3 > fft.json&#xA;

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    &#xA;

    Using C, same stuff : Apply FFT on pcm data and convert to a spectrogram

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    FFMPEG waveform filter documentation

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  • How do I know ffmpeg-php is installed ?

    18 juillet 2014, par Rob Avery IV

    I just followed the instructions from this link on how to install ffmpeg-php on my dedicated server : http://www.ndchost.com/wiki/server-administration/install-ffmpeg

    At the bottom, it says to run the command php -i|grep ffmpeg and if it outputs the following lines then it is installed :

    ffmpegffmpeg support (ffmpeg-php) => enabled
    ffmpeg-php version => 0.6.0
    ffmpeg.allow_persistent => 0 => 0

    When I run it, it gives me this :

    ffmpeg
    ffmpeg-php version => 0.6.0-svn
    ffmpeg-php built on => Jul 18 2014 08:46:12
    ffmpeg-php gd support  => enabled
    ffmpeg libavcodec version => Lavc52.108.0
    ffmpeg libavformat version => Lavf52.93.0
    ffmpeg swscaler version => SwS0.12.0
    ffmpeg.allow_persistent => 0 => 0
    ffmpeg.show_warnings => 0 => 0
    PWD => /usr/local/src/ffmpeg-php-0.6.0
    _SERVER["PWD"] => /usr/local/src/ffmpeg-php-0.6.0
    _ENV["PWD"] => /usr/local/src/ffmpeg-php-0.6.0

    I got 2/3 lines, but the one is not character-for-character the same.

    Is ffmpegffmpeg support (ffmpeg-php) => enabled the same as ffmpegffmpeg support (ffmpeg-php) => enabled in this context ?

    EDIT :
    Running this command ffmpeg -version gives me this result :

    FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
     built on Jul 18 2014 08:41:45 with gcc 4.4.7 20120313 (Red Hat 4.4.7-3)
     configuration: --enable-libmp3lame --disable-mmx --enable-shared
     libavutil     50.36. 0 / 50.36. 0
     libavcore      0.16. 1 /  0.16. 1
     libavcodec    52.108. 0 / 52.108. 0
     libavformat   52.93. 0 / 52.93. 0
     libavdevice   52. 2. 3 / 52. 2. 3
     libavfilter    1.74. 0 /  1.74. 0
     libswscale     0.12. 0 /  0.12. 0
    FFmpeg SVN-r26402
    libavutil     50.36. 0 / 50.36. 0
    libavcore      0.16. 1 /  0.16. 1
    libavcodec    52.108. 0 / 52.108. 0
    libavformat   52.93. 0 / 52.93. 0
    libavdevice   52. 2. 3 / 52. 2. 3
    libavfilter    1.74. 0 /  1.74. 0
    libswscale     0.12. 0 /  0.12. 0
  • Cannot get JACK Audio/Netjack working over LAN

    23 juin 2020, par James

    I'm trying to stream low latency audio between 2 raspberry pis. Both gstreamer and ffmpeg induce 2+ second delays for me.

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    I've played around with Jack Audio and locally on a single pi it seems promising. I can route mic input to a speaker locally and it is almost instantaneous.

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    However, I have been having trouble getting it to route between devices using Netjack.

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    # ON SERVER&#xA;jackd -P70 -p16 -t2000 -dalsa -dhw:1 -p128 -n3 -r44100 -s &#xA;&#xA;# ON CLIENT&#xA;jackd -v -R -P70 -dnetone -i1 -o1 -I0 -O0  -r44100 -p128 -n3&#xA;&#xA;# ON SERVER&#xA;jack_netsource -H &lt; ip address of client >&#xA;jack_lsp # list availible connection ports&#xA;&#xA;>system:capture_1&#xA;>system:playback_1&#xA;>system:playback_2&#xA;>netjack:capture_1&#xA;>netjack:capture_2&#xA;>netjack:capture_3&#xA;>netjack:playback_1&#xA;>netjack:playback_2&#xA;>netjack:playback_3&#xA;&#xA;jack_connect system:capture_1 system:playback_1 # this works&#xA;jack_connect system:capture_1 netjack:playback_1 # this doesn&#x27;t work :(&#xA;

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    Most of the launch options I pulled from here http://wiki.linuxaudio.org/wiki/raspberrypi#using_jack. I'll be honest I don't really know what they do.

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    The client jackd output shows messages like

    &#xA;&#xA;

    Jack: data not valid&#xA;Jack: data not valid&#xA;Jack: JackSocketServerChannel::Execute : fPollTable i = 1 fd = 6&#xA;Jack: JackRequest::Notification&#xA;Jack: JackEngine::ClientNotify: no callback for notification = 3&#xA;Jack: JackEngine::ClientNotify: no callback for notification = 3&#xA;netxruns... duration: 139ms&#xA;Jack: JackSocketServerChannel::Execute : fPollTable i = 1 fd = 6&#xA;Jack: JackRequest::Notification&#xA;Jack: JackEngine::ClientNotify: no callback for notification = 3&#xA;Jack: JackEngine::ClientNotify: no callback for notification = 3&#xA;

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    And the server jack_netsource output looks like

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    current latency 114&#xA;current latency 20&#xA;current latency 27&#xA;current latency 29&#xA;current latency 48&#xA;current latency 23&#xA;current latency 33&#xA;current latency 28&#xA;current latency 41&#xA;current latency 84&#xA;current latency 44&#xA;

    &#xA;&#xA;

    and the server jackd output looks like

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    JackAudioDriver::ProcessGraphAsyncMaster: Process error&#xA;JackAudioDriver::ProcessGraphAsyncMaster: Process error&#xA;JackAudioDriver::ProcessGraphAsyncMaster: Process error&#xA;JackAudioDriver::ProcessGraphAsyncMaster: Process error&#xA;JackEngine::XRun: client = netjack was not finished, state = Triggered&#xA;JackAudioDriver::ProcessGraphAsyncMaster: Process error&#xA;JackAudioDriver::ProcessGraphAsyncMaster: Process error&#xA;JackEngine::XRun: client = netjack was not finished, state = Triggered&#xA;JackEngine::XRun: client = netjack was not finished, state = Triggered&#xA;

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    I believe the -dnetone flag indicates to use Netjack2. Netjack 1, which I've tried with the -dnet flag results in a single Not Connected message from jack_netsource and :

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    Jack: CatchHost fd = 5 err = Resource temporarily unavailable&#xA;Jack: CatchHost fd = 5 err = Resource temporarily unavailable&#xA;Jack: CatchHost fd = 5 err = Resource temporarily unavailable&#xA;Jack: CatchHost fd = 5 err = Resource temporarily unavailable&#xA;Jack: CatchHost fd = 5 err = Resource temporarily unavailable&#xA;Jack: JackSocketServerChannel::Execute : fPollTable i = 1 fd = 6&#xA;

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    from the client jackd.

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