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• Faster frame extraction than ffmpeg

  23 janvier 2013, par Ben Ford

  I have a video analytics program that processes assorted frames from a video. (Several hours long)
  The video is likely going to be an MP4 but may be other formats going forwards.

  At the moment, I have a C# wrapper around an ffmpeg call to extract an individual frame at the requested time. (I'm using the ffmpeg.exe binary. Not the libraries directly)
  At the moment, this all works. But it's slow. Very slow.

  I've found ways to improve the speed by storing the extracted frames in a ramdisk while they're being processed. Changing the stored image format etc...

  I just wanted to check if anyone could think of any way to pull individual frames out. At split-second accuracy.
  I know this is probably possible with DShow etc... I went straight to FFMPEG as I've used it before. But if DShow is likely to be faster I'll gladly change !

• How to process single segment from fragmented mp4 container ?

  14 septembre 2020, par user14258924

  I have fragmented mp4 that I stream. First the mp4 header and then individual segments that are each one GOP. It is h264 and aac encoded video that I am getting from RTMP server.

  


  I would like to process these individual segments with ffmpeg(I doubt there are other tools available). Either adjust resolution or bitrate or even transcode to vp8/9 or avi1 if needed.

  


  But it seems that ffmpeg cannot handle this because the segment has no header. So I wodner if there is a flag or set of flags for ffmpeg to be able to process these segments without the header ? I could possibly just take the raw h264 and aac packets from the RTMP and not pack it into MP4 container beforehand, if that helps - would ffmpeg be able to process these ?

  


• 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;