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• Ffmpeg 4 audio and 1 video input to 4 video outputs performance issue

  22 février 2021, par Yusufu

  I have create 4 null sink pulse monitor and it works fine.
When I publish 4 output to rtmp audio having noise and stopping. When works with 2 outputs it works fine.
If I decrease the resolution from 1920x1080 to 1280*720 it works fine too.
Using 4 different audio inputs and 1 video input

  


  
SCREEN_WIDTH=1920
SCREEN_HEIGHT=1080
SCREEN_RESOLUTION=${SCREEN_WIDTH}x${SCREEN_HEIGHT}
COLOR_DEPTH=24
X_SERVER_NUM=2
VIDEO_BITRATE=3000
VIDEO_FRAMERATE=30
VIDEO_GOP=$((VIDEO_FRAMERATE))
AUDIO_BITRATE=160k
AUDIO_SAMPLERATE=44100
AUDIO_CHANNELS=1
#some codes here

ffmpeg -y\
  -hide_banner -loglevel error \
  -nostdin \
  -s ${SCREEN_RESOLUTION} \
  -r ${VIDEO_FRAMERATE} \
  -draw_mouse 0 \
  -f x11grab \
    -i ${DISPLAY} \
  -f pulse -i MySink1.monitor \
  -f pulse -i MySink2.monitor \
  -f pulse -i MySink3.monitor \
  -f pulse -i MySink4.monitor \
  -c:v libx264 \
    -pix_fmt yuv420p \
    -profile:v main \
    -preset veryfast \
    -minrate ${VIDEO_BITRATE} \
    -maxrate ${VIDEO_BITRATE} \
    -g ${VIDEO_GOP} \
    -map 0 -f flv -map 1  ${RTMP_URL1} \
  -c:v libx264 \
    -pix_fmt yuv420p \
    -profile:v main \
    -preset veryfast \
    -minrate ${VIDEO_BITRATE} \
    -maxrate ${VIDEO_BITRATE} \
    -g ${VIDEO_GOP} \
    -map 0 -f flv -map 2  ${RTMP_URL2} \
  -c:v libx264 \
    -pix_fmt yuv420p \
    -profile:v main \
    -preset veryfast \
    -minrate ${VIDEO_BITRATE} \
    -maxrate ${VIDEO_BITRATE} \
    -g ${VIDEO_GOP} \
    -map 0 -f flv -map 3  ${RTMP_URL3} \
  -c:v libx264 \
    -pix_fmt yuv420p \
    -profile:v main \
    -preset veryfast \
    -minrate ${VIDEO_BITRATE} \
    -maxrate ${VIDEO_BITRATE} \
    -g ${VIDEO_GOP} \
    -map 0 -f flv -map 4  ${RTMP_URL4} \````
    
I guess I need some performance issue. How can I add **tee** or use one decoded video in all outputs. 


  


• How to add multiple audio to a video at specific time for specific duration

  14 février 2021, par Javed Saifi

  I have a video.mp4 file of 20 seconds without audio stream, and I have 2 audio files audio1.mp3 and audio2.mp3. What I want is audio1 should start playe at 3 seconds for 5 seconds, and audio 2 should start play at 10 seconds for 6 seconds.

  


  ffmpeg -y -i video1.mp4 -i audio1.mp3 -i audio2.mp3 -filter_complex "[1]adelay=3000|3000[aud1];[2]adelay=10000|10000[aud2];[aud1][aud2]amix=2,apad[a];
[0][a]amix=duration=first[a]" -map 0:v -map "[a]" -c:v copy -ac 2 output.mp4


  


  what I'm trying to achieve is the final output will be a 20 seconds video where audio1 will start palying at 3 seconds to 8 seconds and audio2 will start from 10 seconds to 16 seconds.

  


• How to create a video file webm from chunks by media recorder api using ffmpeg

  17 octobre 2020, par Caio Nakai

  I'm trying to create a webm video file from blobs generated by MediaRecorderAPI in a NodeJS server using FFMPEG. I'm able to create the .webm file but it's not playable, I ran this command $ ffmpeg.exe -v error -i lel.webm -f null - >error.log 2>&1 to generate an error log, the error log file contains this :

  


  


  [null @ 000002ce7501de40] Application provided invalid, non monotonically increasing dts to muxer in stream 0 : 1 >= 1

  


  [h264 @ 000002ce74a727c0] Invalid NAL unit size (804 > 74).

  


  [h264 @ 000002ce74a727c0] Error splitting the input into NAL units.

  


  Error while decoding stream #0:0 : Invalid data found when processing input

  


  


  This is my web server code

  


  const app = require("express")();
const http = require("http").createServer(app);
const io = require("socket.io")(http);
const fs = require("fs");
const child_process = require("child_process");

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

io.on("connection", (socket) => {
  console.log("a user connected");

  const ffmpeg = child_process.spawn("ffmpeg", [
    "-i",
    "-",
    "-vcodec",
    "copy",
    "-f",
    "flv",
    "rtmpUrl.webm",
  ]);

  ffmpeg.on("close", (code, signal) => {
    console.log(
      "FFmpeg child process closed, code " + code + ", signal " + signal
    );
  });

  ffmpeg.stdin.on("error", (e) => {
    console.log("FFmpeg STDIN Error", e);
  });

  ffmpeg.stderr.on("data", (data) => {
    console.log("FFmpeg STDERR:", data.toString());
  });

  socket.on("message", (msg) => {
    console.log("Writing blob! ");
    ffmpeg.stdin.write(msg);
  });

  socket.on("stop", () => {
    console.log("Stop recording..");
    ffmpeg.kill("SIGINT");
  });
});

http.listen(3000, () => {
  console.log("listening on *:3000");
});



  


  And this is my client code, using HTML, JS :

  


  &#xA;&#xA;  &#xA;    &#xA;    &#xA;    &#xA;  &#xA;  <code class="echappe-js">&lt;script src='http://stackoverflow.com/socket.io/socket.io.js'&gt;&lt;/script&gt;&#xA;  &lt;script&gt;&amp;#xA;    const socket = io();&amp;#xA;    let mediaRecorder = null;&amp;#xA;    const startRecording = (someStream) =&gt; {&amp;#xA;      const mediaStream = new MediaStream();&amp;#xA;      const videoTrack = someStream.getVideoTracks()[0];&amp;#xA;      const audioTrack = someStream.getAudioTracks()[0];&amp;#xA;      console.log(&quot;Video trac &quot;, videoTrack);&amp;#xA;      console.log(&quot;audio trac &quot;, audioTrack);&amp;#xA;      mediaStream.addTrack(videoTrack);&amp;#xA;      mediaStream.addTrack(audioTrack);&amp;#xA;&amp;#xA;      const recorderOptions = {&amp;#xA;        mimeType: &quot;video/webm;codecs=h264&quot;,&amp;#xA;        videoBitsPerSecond: 3 * 1024 * 1024,&amp;#xA;      };&amp;#xA;&amp;#xA;      mediaRecorder = new MediaRecorder(mediaStream, recorderOptions);&amp;#xA;      mediaRecorder.start(1000); // 1000 - the number of milliseconds to record into each Blob&amp;#xA;      mediaRecorder.ondataavailable = (event) =&gt; {&amp;#xA;        console.debug(&quot;Got blob data:&quot;, event.data);&amp;#xA;        if (event.data &amp;amp;&amp;amp; event.data.size &gt; 0) {&amp;#xA;          socket.emit(&quot;message&quot;, event.data);&amp;#xA;        }&amp;#xA;      };&amp;#xA;    };&amp;#xA;&amp;#xA;    const getVideoStream = async () =&gt; {&amp;#xA;      try {&amp;#xA;        const stream = await navigator.mediaDevices.getUserMedia({&amp;#xA;          video: true,&amp;#xA;          audio: true,&amp;#xA;        });&amp;#xA;        startRecording(stream);&amp;#xA;        myVideo.srcObject = stream;&amp;#xA;      } catch (e) {&amp;#xA;        console.error(&quot;navigator.getUserMedia error:&quot;, e);&amp;#xA;      }&amp;#xA;    };&amp;#xA;&amp;#xA;    const stopRecording = () =&gt; {&amp;#xA;      mediaRecorder.stop();&amp;#xA;      socket.emit(&quot;stop&quot;);&amp;#xA;    };&amp;#xA;  &lt;/script&gt;&#xA;  &#xA;    
  hello world
  &#xA;
  start rec
  &#xA;
  stop rec
  &#xA;&#xA;    &#xA;    &lt;script&gt;&amp;#xA;      const myVideo = document.getElementById(&quot;myvideo&quot;);&amp;#xA;      myVideo.muted = true;&amp;#xA;    &lt;/script&gt;&#xA;  &#xA;&#xA;&#xA;
  

  


  Any help is appreciated !