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Médias (91)
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Corona Radiata
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Lights in the Sky
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Head Down
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Echoplex
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Discipline
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Letting You
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
Autres articles (45)
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Installation en mode ferme
4 février 2011, parLe mode ferme permet d’héberger plusieurs sites de type MediaSPIP en n’installant qu’une seule fois son noyau fonctionnel.
C’est la méthode que nous utilisons sur cette même plateforme.
L’utilisation en mode ferme nécessite de connaïtre un peu le mécanisme de SPIP contrairement à la version standalone qui ne nécessite pas réellement de connaissances spécifique puisque l’espace privé habituel de SPIP n’est plus utilisé.
Dans un premier temps, vous devez avoir installé les mêmes fichiers que l’installation (...) -
Multilang : améliorer l’interface pour les blocs multilingues
18 février 2011, parMultilang est un plugin supplémentaire qui n’est pas activé par défaut lors de l’initialisation de MediaSPIP.
Après son activation, une préconfiguration est mise en place automatiquement par MediaSPIP init permettant à la nouvelle fonctionnalité d’être automatiquement opérationnelle. Il n’est donc pas obligatoire de passer par une étape de configuration pour cela. -
Soumettre améliorations et plugins supplémentaires
10 avril 2011Si vous avez développé une nouvelle extension permettant d’ajouter une ou plusieurs fonctionnalités utiles à MediaSPIP, faites le nous savoir et son intégration dans la distribution officielle sera envisagée.
Vous pouvez utiliser la liste de discussion de développement afin de le faire savoir ou demander de l’aide quant à la réalisation de ce plugin. MediaSPIP étant basé sur SPIP, il est également possible d’utiliser le liste de discussion SPIP-zone de SPIP pour (...)
Sur d’autres sites (5955)
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Live audio using ffmpeg, javascript and nodejs
8 novembre 2017, par klausI am new to this thing. Please don’t hang me for the poor grammar. I am trying to create a proof of concept application which I will later extend. It does the following : We have a html page which asks for permission to use the microphone. We capture the microphone input and send it via websocket to a node js app.
JS (Client) :
var bufferSize = 4096;
var socket = new WebSocket(URL);
var myPCMProcessingNode = context.createScriptProcessor(bufferSize, 1, 1);
myPCMProcessingNode.onaudioprocess = function(e) {
var input = e.inputBuffer.getChannelData(0);
socket.send(convertFloat32ToInt16(input));
}
function convertFloat32ToInt16(buffer) {
l = buffer.length;
buf = new Int16Array(l);
while (l--) {
buf[l] = Math.min(1, buffer[l])*0x7FFF;
}
return buf.buffer;
}
navigator.mediaDevices.getUserMedia({audio:true, video:false})
.then(function(stream){
var microphone = context.createMediaStreamSource(stream);
microphone.connect(myPCMProcessingNode);
myPCMProcessingNode.connect(context.destination);
})
.catch(function(e){});In the server we take each incoming buffer, run it through ffmpeg, and send what comes out of the std out to another device using the node js ’http’ POST. The device has a speaker. We are basically trying to create a 1 way audio link from the browser to the device.
Node JS (Server) :
var WebSocketServer = require('websocket').server;
var http = require('http');
var children = require('child_process');
wsServer.on('request', function(request) {
var connection = request.accept(null, request.origin);
connection.on('message', function(message) {
if (message.type === 'utf8') { /*NOP*/ }
else if (message.type === 'binary') {
ffm.stdin.write(message.binaryData);
}
});
connection.on('close', function(reasonCode, description) {});
connection.on('error', function(error) {});
});
var ffm = children.spawn(
'./ffmpeg.exe'
,'-stdin -f s16le -ar 48k -ac 2 -i pipe:0 -acodec pcm_u8 -ar 48000 -f aiff pipe:1'.split(' ')
);
ffm.on('exit',function(code,signal){});
ffm.stdout.on('data', (data) => {
req.write(data);
});
var options = {
host: 'xxx.xxx.xxx.xxx',
port: xxxx,
path: '/path/to/service/on/device',
method: 'POST',
headers: {
'Content-Type': 'application/octet-stream',
'Content-Length': 0,
'Authorization' : 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
'Transfer-Encoding' : 'chunked',
'Connection': 'keep-alive'
}
};
var req = http.request(options, function(res) {});The device supports only continuous POST and only a couple of formats (ulaw, aiff, wav)
This solution doesn’t seem to work. In the device speaker we only hear something like white noise.
Also, I think I may have a problem with the buffer I am sending to the ffmpeg std in -> Tried to dump whatever comes out of the websocket to a .wav file then play it with VLC -> it plays everything in the record very fast -> 10 seconds of recording played in about 1 second.
I am new to audio processing and have searched for about 3 days now for solutions on how to improve this and found nothing.
I would ask from the community for 2 things :
-
Is something wrong with my approach ? What more can I do to make this work ? I will post more details if required.
-
If what I am doing is reinventing the wheel then I would like to know what other software / 3rd party service (like amazon or whatever) can accomplish the same thing.
Thank you.
-
-
Setting individual pixels of an RGB frame for ffmpeg encoding
15 mai 2013, par Camille GoudeseuneI'm trying to change the test pattern of an ffmpeg streamer, Trouble syncing libavformat/ffmpeg with x264 and RTP , into familiar RGB format. My broader goal is to compute frames of a streamed video on the fly.
So I replaced its
AV_PIX_FMT_MONOWHITEwithAV_PIX_FMT_RGB24, which is "packed RGB 8:8:8, 24bpp, RGBRGB..." according to http://libav.org/doxygen/master/pixfmt_8h.html .To stuff its pixel array called
data, I've tried many variations onfor (int y=0; y/ const double j = y/double(HEIGHT);
rgb[0] = 255*i;
rgb[1] = 0;
rgb[2] = 255*(1-i);
}
}At
HEIGHTxWIDTH= 80x60, this version yields
, when I expect a single blue-to-red horizontal gradient.640x480 yields the same 4-column pattern, but with far more horizontal stripes.
640x640, 160x160, etc, yield three columns, cyan-ish / magenta-ish / yellow-ish, with the same kind of horizontal stripiness.
Vertical gradients behave even more weirdly.
Appearance was unaffected by an
AV_PIX_FMT_RGBAattempt (4 not 3 bytes per pixel, alpha=255). Also unaffected by a port from C to C++.The argument
srcStridespassed tosws_scale()is a length-1 array, containing the single intHEIGHT.Access each Pixel of AVFrame asks the same question in less detail, so far unanswered.
The streamer emits one warning, which I doubt affects appearance :
[rtp @ 0x269c0a0] Encoder did not produce proper pts, making some up.So. How do you set the RGB value of a pixel in a frame to be sent to sws_scale() (and then to x264_encoder_encode() and av_interleaved_write_frame()) ?
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How to sync network audio with a different network video and play it with chewie
26 mars 2023, par Rudra SharmaI am trying to stream a reddit videos on my app. For that reason I am using Reddit API but it is only giving the video url like 'redd.it/mpym0z9q8opa1/DASH_1080.mp4 ?source=fallback' with no audio but after some research I found out that we can get audio url by editing video url 'redd.it/mpym0z9q8opa1/DASH_audio.mp4 ?source=fallback'.


Now I have both audio and video url with me how can I sync them on network and stream them on my app using chewie package (video player).


This my code so far


import 'dart:async';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:flutter/material.dart';
import 'package:video_player/video_player.dart';
import 'package:chewie/chewie.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
 @override
 Widget build(BuildContext context) {
 return MaterialApp(
 title: 'Reddit Videos',
 theme: ThemeData(
 primarySwatch: Colors.blue,
 visualDensity: VisualDensity.adaptivePlatformDensity,
 ),
 home: VideoPlayerScreen(),
 );
 }
}

class VideoPlayerScreen extends StatefulWidget {
 @override
 _VideoPlayerScreenState createState() => _VideoPlayerScreenState();
}

class _VideoPlayerScreenState extends State<videoplayerscreen> {
 final List<string> _videoUrls = [];

 @override
 void initState() {
 super.initState();
 _loadVideos();
 }

 Future<void> _loadVideos() async {
 try {
 final videoUrls =
 await RedditApi.getVideoUrlsFromSubreddit('aww');

 setState(() {
 _videoUrls.addAll(videoUrls);
 });
 } catch (e) {
 print(e);
 }
 }

 @override
 Widget build(BuildContext context) {
 return Scaffold(
 appBar: AppBar(
 title: Text('Reddit Videos'),
 ),
 body: SafeArea(
 child: _videoUrls.isNotEmpty
 ? _buildVideosList()
 : Center(child: CircularProgressIndicator()),
 ),
 );
 }

 Widget _buildVideosList() {
 return ListView.builder(
 itemCount: _videoUrls.length,
 itemBuilder: (context, index) {
 return Padding(
 padding: const EdgeInsets.all(8.0),
 child: Chewie(
 controller: ChewieController(
 videoPlayerController: VideoPlayerController.network(
 _videoUrls[index],
 ),
 aspectRatio: 9 / 16,
 autoPlay: true,
 looping: true,
 autoInitialize: true,
 ),
 ),
 );
 },
 );
 }
}

class RedditApi {
 static const String BASE_URL = 'https://www.reddit.com';
 static const String CLIENT_ID = 'id';
 static const String CLIENT_SECRET = 'secret';

 static Future> getVideoUrlsFromSubreddit(
 String subredditName) async {
 final response = await http.get(
 Uri.parse('$BASE_URL/r/$subredditName/top.json?limit=10'),
 headers: {'Authorization': 'Client-ID $CLIENT_ID'});

 if (response.statusCode == 200) {
 final jsonData = jsonDecode(response.body);
 final postsData = jsonData['data']['children'];

 final videoUrls = <string>[];

 for (var postData in postsData) {
 if (postData['data']['is_video']) {
 videoUrls.add(postData['data']['media']['reddit_video']
 ['fallback_url']);
 }
 }

 return videoUrls;
 } else {
 throw Exception("Failed to load videos from subreddit");
 }
 }
}
</string></void></string></videoplayerscreen>

I think the code is self explainatory about what I am trying to achieve (Trying to make a client for reddit).


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