Newest 'ffmpeg' Questions - Stack Overflow

http://stackoverflow.com/questions/tagged/ffmpeg

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  • how does the FFmpegFrameRecorder record portrait video?

    10 November 2013, by user1329261

    i hava use the javacv FFmpegFrameRecorder to record a video on android ,finally i found that this recorder only record landscape video,can anyone tell me how to record video in portrait direction?

    thank you very much!

  • How to give a file path in FFmpeg for Android

    10 November 2013, by ssrp

    I am developing a movie player using FFmpeg libraries. So far I have built FFmpeg for android and can call a native function through JNI. I want to give a file to be opened by FFMpeg open_file function, I want to know how to give a file to the function that is stored inside the external storage in the device. I am using HTC One x for debugging the app. And I know how to get the absolute path of the file in Java. Please help.

  • iOS- ffmpeg stop rtsp stream

    9 November 2013, by user2964075

    I am developing an iOS application that streams rtsp feeds. My application can only stream one feed at a time. My question is how can I stop/close the stream so that I can load a new rtsp feed and start streaming it?

    Thanks a lot.

  • FFMPEG: On Upload To Youtube The Video Starts At 0:06 (Shorter Than Original)

    9 November 2013, by mashup

    I uploaded a video MP4 to Youtube which was created by FFMPEG

    Unfortunately, all videos seem to be shorter than the original. I read all sorts of stuff about an moov atom and Youtube being unreliable, but I did not find the actual cause

    MP4 is supposed to be the preferred file format: https://support.google.com/youtube/answer/1722171?hl=en

    THE FILZE: Less Than 1MB! Original Length: 24 seconds, Once Uploaded: 18 seconds

  • I have an audio data stream from ffmpeg, how can I play it in a browser?

    9 November 2013, by Conor Patrick

    I've been able to successfully stream live audio from my mic to my node server. I would now like to stream that to all connected clients. I have been trying to do it with web sockets.

    I'm streaming the audio with this command

    ffmpeg -f alsa -i hw:0 -acodec mp2 -f mp3 -r 30 http://localhost:8086

    Node gets the buffer array and I write it to all connected clients like so with the 'ws' package

    // HTTP Server to accept incomming MP3 Stream (audio)
var audioServer = require('http').createServer( function(request, response) {

       audioSocket.broadcast(data, {binary:true});

}).listen(8086);

var audioSocket = new (require('ws').Server)({port: 8088});
audioSocket.broadcast = function(data, opts) {

    for( var i in this.clients ) {
        this.clients[i].send(data);
    }
};

    Any idea of how I can play this data on a browser? I tried following this topic but the decodeAudioData() method fails.

    My client side code

    node={};
var audio = new WebSocket('ws://localhost:8088/');
audio.binaryType = "arraybuffer";
var context = new webkitAudioContext();

audio.onmessage = function(data){
    node.buf=data.data;
    node.sync=0;
    node.retry=0;
    decode(node);
}

function syncStream(node){ // should be done by api itself. and hopefully will.
    var buf8 = new Uint8Array(node.buf); 
    buf8.indexOf = Array.prototype.indexOf;
    var i=node.sync, b=buf8;
    while(1) {
        node.retry++;
        i=b.indexOf(0xFF,i); if(i==-1 || (b[i+1] & 0xE0 == 0xE0 )) break;
        i++;
    }
    if(i!=-1) {
        var tmp=node.buf.slice(i); //carefull there it returns copy
        delete(node.buf); node.buf=null;
        node.buf=tmp;
        node.sync=i;
        return true;
    }
    return false;
}

function decode(node) {
    context.decodeAudioData(node.buf,
    function(decoded){
        node.source  = context.createBufferSource();
        node.source.connect(context.destination);
        node.source.buffer=decoded; 
        node.source.noteOn(context.currentTime);
        console.log('IT WORKED!  DECODED', decoded);
    },
    function(){ // only on error attempt to sync on frame boundary
        //console.log('error');
        if(syncStream(node)) decode(node);
    });
}

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