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• Mux ts segments to fragmented mp4 in realtime

  10 avril 2021, par bsack

  I have an HLS stream which plays in the browser. What I want to do is have a URL like /stream.mp4 that plays the livestream back as a fragmented mp4 from the current point in time. This way you could download the stream as a single file and it would work without any js dependencies.

  


  The method I thought of is :

  


  

  1. send an mp4 header

  


  2. wait for a new segment

  


  3. convert the segment into an mp4 fragment with ffmpeg

  


  4. send the mp4 fragment

  


  5. go to 2.

  


  


  (I know you can concatenate .ts segments but they don't play in Firefox.)

  


  This answer describes how to create a fragmented mp4 when you have all the segments at hand (tl ;dr use -movflags frag_keyframe+emptymoov). But I want to do this on the fly so each new HLS segment is converted to an mp4 fragment as soon as it's created.

  


  I think this is similar to what DASH does natively, where any chunk chunk-$n.m4s can be appended to init.m4s and it'll be a proper fragmented mp4. But can this be done without using DASH ?

  


  How can I transmux a ts segment into an mp4 fragment ?

  


  Edit : I found a way of doing what I wanted, but not through transmuxing mpegts segments to fmp4. It turns out that later versions of HLS do support fragmented mp4 (like DASH does), and FFmpeg provides the -hls_segment_type fmp4 option for this.

  


• upload and stream ffmpeg stream chunk and mpd file in s3

  29 juin 2024, par Kamruzzaman Rabeen

  i want to make ann web app where i can upload a video. After uploading video its should be compress by ffmpeg after that i want to keep the data on aws S3.

  


  I can compress by ffmpeg. but i have no idea which file i should keep in s3 because after compress its create many chunk file and one mpd xml file.

  


  Also i want to stream the video from mpd file after fetching data from s3.
here is my upload function code.
const videoPath = req.file.path; const outputDir = path.join(__dirname, 'dash'); const uniqueId = uuidv4(); const outputFilePath = path.join(outputDir, $uniqueId_stream.mpd); const bucketName = process.env.S3_BUCKET_NAME; const s3Key = dash/$uniqueId_stream.mpd` ;

  


  // Ensure the output directory exists
if (!fs.existsSync(outputDir)) {
    fs.mkdirSync(outputDir, { recursive: true });
}

ffmpeg(videoPath)
    .outputOptions([
        '-profile:v main',
        '-use_template 1',
        '-use_timeline 1',
        '-b:v 1000k',
        '-b:a 128k',
        '-f dash'
    ])
    .on('end', async () => {
        console.log('DASH file created successfully');
        try {
            const s3Url = await uploadToS3(outputFilePath, bucketName, s3Key);
            res.status(200).json({ message: 'Video uploaded and DASH file created', url:    s3Url });
        } catch (err) {
            console.error('Error uploading to S3: ', err);
            res.status(500).json({ message: 'Error uploading to S3', error: err.message });
        }
    })
    .on('error', (err) => {
        console.error('Error processing video: ', err);
        res.status(500).json({ message: 'Error processing video', error: err.message });
    })
    .save(outputFilePath);`

`const uploadToS3 = (filePath, bucketName, key) => {
return new Promise((resolve, reject) => {
    fs.readFile(filePath, (err, data) => {
        if (err) return reject(err);

        const params = {
            Bucket: bucketName,
            Key: key,
            Body: data,
            ContentType: 'application/dash+xml'
        };

        s3.upload(params, (err, data) => {
            if (err) return reject(err);
            resolve(data.Location);
        });
    });
});


  


   ;`

  


  i have tried this version of code.

  


  now i want to know what is the best to way to keep data in s3 for compress video after ffmpeg.

  


• avformat/matroskaenc : Don't waste bytes on ChapterAtoms length fields

  14 janvier 2022, par Andreas Rheinhardt

  avformat/matroskaenc : Don't waste bytes on ChapterAtoms length fields
  Also check the (user-provided) metadata tags for being too long.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/matroskaenc.c
  • [DH] tests/ref/fate/webm-dash-chapters