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• FFmpeg downscale video while maintaining aspect ratio SAR and DAR

  12 avril 2023, par Solaris

  How can I resize the video (eg 1080x ? to 480x ?) while maintain aspect ratio (SAR and DAR) ?
I want to use the output video to create Dash MPD

  


  I tried multiple filters
-filter:v 'scale=854:480'
-filter:v 'scale=-1:480'
-filter:v 'scale=-2:480'
-filter:v 'scale=854:480:force_original_aspect_ratio=decrease,pad=854:480:(ow-iw)/2:(oh-ih)/2,setsar=sar=1'

  


  But can get exact SAR and DAR , at least ffmpeg -f dash doesn't allow both streams to be in same adaptation set

  


• 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

• 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.