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• ffplay - how to have video and audio waveform [duplicate]

  19 février 2018, par francis

  This question already has an answer here :

  • ffplay / ffmpeg setup table with audio and video filters
    
    1 answer
    

  I’ve been trying out various commands trying to figure out how to have a stack of video and audio waveform according to : https://trac.ffmpeg.org/wiki/FancyFilteringExamples#waveform

  Video only :

  ffplay -i abc.mp4 -vf "split[a][b];[a]waveform=e=1,split=1[c];[c]crop=in_w:16:0:0,lutyuv=y=val:v=180[high]; [b][high]vstack=2"

  Audio only :

  ffplay -f lavfi 'amovie=april.flac,asplit=2[out1][a]; [a]showwaves=s=640x240[waves]; [waves] vstack[out0]'

  But there isn’t any that combines and shows the top half as video and bottom half as the audio waveform. Is it possible ?

• ffmpeg video duration not true

  9 juillet 2017, par MOHAMMAD BALADI

  i have a problem with ffmpeg in php
  i need export a trailer from uploaded video in php,and for it try this cod :

  exec( "ffmpeg -i $vidpath -vf select='lt(mod(t,60),5)',setpts=N/FRAME_RATE/TB -af aselect='lt(mod(t,60),5)',asetpts=N/SR/TB  $trailer 2>&1")

  this code generate trailer from video as every 60 second 5 second but trailer file duration is equal original file !
  for example if target video time is 4:00 minutes, trailer file time will be 4:00 minutes but only show 20 seconds video !
  can every body help me ?
  thanx

• how to prevent the hls video player dont refresh when m3u8 changes

  6 juin 2024, par Leo

  here i am using ffmpeg to use camera and audio to make a hls stream on server as the stream continious old m3u8 components deletes and new ones gets added to main.m3u8. but as we insert the url of hls stream file main.m3u8. the player refreshes as soon as the file gets rewritten because of new and old ones. so

  


  i have tried to change the players like hls.js or videojs etc none were to solve this. how to solve this and make sure the stream runs smoothly.

  


  Server.js

  


  const startStreaming = (viddev,auddev) => {
    if (ffmpegProcess) {
        ffmpegProcess.kill();
    }
    const segmentDuration = 10;
    const outputFilename = './video/output.m3u8';
    const ffmpegCommand = `ffmpeg -f dshow -i video="${viddev}" -f dshow -i audio="${auddev}" -codec:v libx264 -preset ultrafast -tune zerolatency -codec:a aac -b:a 128k -hls_time ${segmentDuration} -hls_list_size 3 -hls_flags delete_segments -start_number 0 -hls_segment_type mpegts ${outputFilename}`;

    ffmpegProcess = exec(ffmpegCommand);

    ffmpegProcess.stderr.on('data', (data) => {
        console.error(`ffmpeg stderr: ${data}`);
    });

    ffmpegProcess.on('close', (code) => {
        console.log(`ffmpeg process exited with code ${code}`);
    });
};

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

// Endpoint to list audio and video devices
app.get('/devices', async (req, res) => {
    const data=await parseDevices()
    // console.log(data.cameras[0].name)
    startStreaming(data.cameras[0].name,data.microphones[0].name);
    res.json(data)
});


  


  index.html

  


  &#xA;&#xA;&#xA;    &#xA;    &#xA;    &#xA;    &#xA;    &#xA;&#xA;&#xA;&#xA;    &#xA;        <source src="https://localhost:3000/video/output.m3u8" type="application/x-mpegURL">&#xA;    &#xA;&#xA;    <code class="echappe-js">&lt;script src=&quot;https://vjs.zencdn.net/8.10.0/video.min.js&quot;&gt;&lt;/script&gt;&#xA;    &lt;script&gt;&amp;#xA;        // Initialize Video.js player&amp;#xA;        var player = videojs(&amp;#x27;video&amp;#x27;, {&amp;#xA;            autoplay: &amp;#x27;play&amp;#x27;,&amp;#xA;            liveui: true  // Enable the live UI for live streams&amp;#xA;        });&amp;#xA;&amp;#xA;        // Seek to live when the player is ready&amp;#xA;        player.ready(function() {&amp;#xA;            player.liveTracker.on(&amp;#x27;liveedgechange&amp;#x27;, function() {&amp;#xA;                player.currentTime(player.liveTracker.liveCurrentTime());&amp;#xA;            });&amp;#xA;        });&amp;#xA;&amp;#xA;        // Handle any errors encountered by Video.js&amp;#xA;        player.on(&amp;#x27;error&amp;#x27;, function() {&amp;#xA;            console.error(&amp;#x27;Video.js encountered an error:&amp;#x27;, player.error());&amp;#xA;        });&amp;#xA;    &lt;/script&gt;&#xA;&#xA;&#xA;&#xA;&#xA;