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• While ffmpeg convers via php website doesnt work

  29 octobre 2013, par Xenos Trojanowicz

  So im using

                  if ($success_msg) 
  
              {
  
                  $tmp_parts = explode('.', $file['name']);
  
                  $ext = array_pop($tmp_parts);
  
                  $ext = strtolower($ext);
  
                  if($ext == "avi" && $convert_avi == true)
  
                      {
  
                          $convert_source = _VIDEOS_DIR_PATH.$new_name;
  
                          $conv_name = substr(md5($file['name'].rand(1,888)), 2, 10).".mp4";
  
                          $converted_file  = _VIDEOS_DIR_PATH.$conv_name;
  
                          $ffmpeg_command = 'ffmpeg -i '.$convert_source.'-acodec libfaac -vcodec libx264 -s 1280x720 -ar 44100 -async 44100 -r 29.970 -ac 2 -qscale 5 '.$converted_file;
  
                          echo exec($ffmpeg_command);
  
                          $sql = "UPDATE pm_temp SET url = '".$conv_name."' WHERE url = '".$new_name."' LIMIT 1";
  
                          $result = @mysql_query($sql);
  
                          unlink($convert_source);    
  
                      }
  
                  echo $success_msg;
  
              }

  This code to convert videos from avi to mp4 but i have another big issue when i upload big file let say 170 mb it converts about 25 minutes or so and while it converts website doesnt work for me.

  NOW I KNOW WHY WEBSITE DOESNT WORK :

  • its only for me becose system doesnt open extra slot to enter to website while it converts
  • i know how to solve this problem with cronjob but im afraid that if something goes wrong it will be biggest fail i ever had

  so im hopping that u guys will suggest something smart and easy to deal with this issue

• {OpenAL(+FFmpeg)} How to queue variable size buffer due to ogg format ?

  11 février 2014, par user3293833

  (First of all, I may feel sorry about my poor English as it's not my native language.)

  I use FFmpeg to decode some audio file and play it with OpenAL by "stream"(i.e."queue" and "unqueue" function of OpenAL).

  When I use my program to play .ogg file, I find that it has a variable nb_samples.(due to ogg has variable bit rate ??) There are 128 B, 512 B and 1024 B of nb_samples. As a results, I must call alDeleteBuffers and alGenBuffers before I use alBufferSamplesSOFT(similar to alBufferData) because it would fail to call alBufferSamplesSOFT without recreate the buffer.
  Notes : alBufferSamplesSOFT is provided by OpenAL Soft. You can just see it as alBufferData.

  Nevertheless, I think it's foolish and inefficient if I do this. Is there is some smart method ? I paste the part of code :

  while (av_read_frame(...) == 0){
  
    avcodec_decode_audio4(...);
  
    swr_convert(...);  // to convert PCM format from FLTP to FLT
  
    alDeleteBuffers(1, theBuffers[?]);
  
    alGenBuffers(1, theBuffers[?]);
  
    alBufferSamplesSOFT(...);  // put those data into OpenAL buffer
  
  }

  if I don't do this, It would failed to update the OpenAL buffer. Is there any method to create a variable size buffer or a big size buffer ? Or is there any method to change the size of buffer ?

  Thanks for you guys.

• NodeJS : Fail to write byte array input from webcam to ffmpeg spawn process

  23 mai 2024, par Thanesh Prabaghan

  I'm using NodeJS server to display an HTML page which has webcam option. Once user visited to my NodeJS server, it will serve html page. User can allow webcam option and see webcam view on the page.

  


  In the backend, I send webcam stream (byte array) using socket.io. I receive byte array successfully in backend with the help of socket.io. BUT MY PROBLEM IS, I can't pipe this byte array to the ffmpeg spawn process. I don't know how to properly pipe this data to the ffmpeg. Once it done, all my problem will be solved.

  


  On the other side, I have node-media-server as RTMP server to publish this stream to VLC player and other devices. Kindly help me to complete this task. I will attach all my code to this question. Kindly run this in your environment and answer the question.

  


  MY HTML PAGE

  


  &#xA;&#xA;  &#xA;    &#xA;      &#xA;&#xA;      &#xA;&#xA;      <code class="echappe-js">&lt;script src=&quot;https://cdn.socket.io/4.7.5/socket.io.min.js&quot; &amp;#xA;        integrity=&quot;integrity_code&quot; &amp;#xA;        crossorigin=&quot;anonymous&quot;&gt;&lt;/script&gt;&#xA;    &#xA;    &#xA;      
  &#xA;        &#xA;&#xA;        &lt;script&gt;&amp;#xA;          const socket = io(&amp;#x27;http://localhost:8080/&amp;#x27;);&amp;#xA;          var video = document.getElementById(&quot;video&quot;);&amp;#xA;&amp;#xA;          if (navigator.mediaDevices.getUserMedia) {&amp;#xA;            navigator.mediaDevices.getUserMedia({ video: true, audio:true })&amp;#xA;            .then(function (stream) {&amp;#xA;              const recorder = new MediaRecorder(stream);&amp;#xA;&amp;#xA;              recorder.ondataavailable = event =&gt; {&amp;#xA;                socket.emit(&amp;#x27;VideoStream&amp;#x27;, event.data);&amp;#xA;              };&amp;#xA;              recorder.start(1000);      &amp;#xA;              video.srcObject = stream;&amp;#xA;            }).catch(function (error) {&amp;#xA;              console.log(&quot;Something went wrong!&quot;);&amp;#xA;            });&amp;#xA;         }  &amp;#xA;       &lt;/script&gt;&#xA;    &#xA;&#xA;&#xA;
  

  


  FFMPEG IMPLEMENTATION

  


  const express = require('express');
const app = express();
const http = require('http');
const server = http.createServer(app);
const { Server } = require("socket.io");
const io = new Server(server);
const path = require('node:path'); 
const { spawn } = require('node:child_process');

let cmd = spawn('ffmpeg.exe', [
    '-c:v', 'copy', '-preset', 'ultrafast', '-tune', 'zerolatency',
    '-c:a', 'aac', '-strict', '-2', '-ar', '44100', '-b:a', '64k',
    '-y',
    '-use_wallclock_as_timestamps', '1',
    '-async', '1',
    '-flush_packets', '1',
    '-rtbufsize', '1000',
    '-bufsize', '1000',
    '-f', 'flv',
     '-i','-',
    'rtmp://localhost:1935',
  ]);

app.use(express.static(path.join(__dirname, 'public')));

app.get('/', (req, res) => {
  res.sendFile(path.join(__dirname + 'index.html'));
});

io.on('connection', (socket) => {
  socket.on("VideoStream", (data) => {
    cmd.stdin.write(data);
  });
});

server.listen(8080, () => {
  console.log('listening on *:8080');
});

```
**NODE MEDIA SERVER IMPLEMENTATION**

```
const NodeMediaServer = require('node-media-server');

const config = {
  rtmp: {
    port: 1935,
    chunk_size: 60000,
    gop_cache: true,
    ping: 30,
    ping_timeout: 60
  },
  http: {
    port: 8000,
    allow_origin: '*'
  }
};

var nms = new NodeMediaServer(config)
nms.run();
```