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• Convert s3 video files resolution and store it back to s3

  5 avril 2019, par Pritam Roy

  I want to convert s3 bucket video file resolutions to other resolutions and store it back to s3.
  I know we can use ffmpeg locally to change the resolution.
  Can we use ffmpeg to convert s3 files and store it back using Django ?

  I am puzzled as from where to start and what should be the process.
  Whether I should have the video file from s3 bucket in buffer and then convert it using ffmpeg and then upload it back to s3.
  Or is there anyway to do it directly without having to keep it in buffer.

• Creating GIF with FFMPEG in AWS Lambda creates an empty gif ?

  29 décembre 2020, par blablubla12

  I'm trying to create a gif using an existing command (which I have no idea what it's doing as I don't really understand ffmpeg). That command worked perfectly on a C# Console App (as a string), however once I migrated to AWS Lambda (Node.js 12.x - which I'm also new at) it uploads an empty gif (0 B). Here is a part of the code :

  


  const bucket = eventObject.BucketName;
const srcKey = eventObject.ObjectKey;
const target = s3.getSignedUrl('getObject', { Bucket: bucket, Key: srcKey, Expires: 1000 });
const overlayTarget = s3.getSignedUrl('getObject', { Bucket: bucket, Key: 'overlays/overlay.png', Expires: 1000 });
const fileName = guid + "_gif.gif";
const tempPath = '/tmp/' + fileName;

function CreateGif() {
    return new Promise((resolve, reject) => {

        const ffmpeg = spawn(ffmpegPath, [
            "-ss",
            eventObject.GifTimecode,
            "-i",
            target,
            "-i",
            overlayTarget,
            "-filter_complex",
            `[0:v] trim = duration = ${eventObject.GifDuration}, setpts = PTS - STARTPTS, scale = 450:-1[trimmed]; [trimmed] split[trimmed1][trimmed2];     [trimmed2] reverse[rev];     [trimmed1] [rev] concat=n=2:v=1:a=0 [v];     [v] [1:v] overlay=0:0:format=rgb[overlayed];     [overlayed] split[a][b];     [a] palettegen=stats_mode=diff[palette];     [b] [palette] paletteuse=bayer:bayer_scale=3.5[out] `,
            "-map",
            '[out]',
            tempPath
        ]);

        ffmpeg.stderr.setEncoding('utf8');
        ffmpeg.stderr.on('data', (data) => {
            console.log(data);
        });

        ffmpeg.on('close', function (code) {
            console.log('closed');
            resolve();
        });

        ffmpeg.on('error', function (err) {
            console.log(err);
            reject();
            throw new Error(err);
        });
    });
}

function uploadToS3() {
    return new Promise((resolve, reject) => {
        let tmpFile = createReadStream(tempPath);

        var params = {
            Bucket: bucket,
            Key: 'gifs/' + fileName,
            Body: tmpFile,
            ContentType: `image/gif`
        };

        s3.upload(params, function (err, data) {
            if (err) {
                console.log(err);
                reject();
            }
            console.log(`successful upload to ${bucket}/${fileName}`);
            resolve();
        });
    });
}

await CreateGif();
await uploadToS3();


  


  I'm sure the issue is the args that are being passed, however I've not found a way to separate the args in the array in a way that works.

  


  Here's the same command in C# (this one works fine) :

  


  var command = "-ss " + timeCode + " -i "
                  + "\"" + videoPath + "\""
                  + " -i "
                  + "\"" + path + "/" + imageOverlayFilePath + "\" "
                  + " -filter_complex "
                  + "\""
                  + $"[0:v] trim = duration = {gifDuration}, setpts = PTS - STARTPTS, scale = 450:-1[trimmed]; [trimmed] split[trimmed1][trimmed2];     [trimmed2] reverse[rev];     [trimmed1] [rev] concat=n=2:v=1:a=0 [v];     [v] [1:v] overlay=0:0:format=rgb[overlayed];     [overlayed] split[a][b];     [a] palettegen=stats_mode=diff[palette];     [b] [palette] paletteuse=bayer:bayer_scale=3.5[out] "
                  + "\""
                  + " -map [out] "
                  + "\"" + output + "\"";


  


  How do I separate the command string in the args array spawn(ffmpegPath, [])

  


• How to add a watermark to video on firebase storage using ffmpeg

  31 décembre 2020, par awabs

  I am trying to add a watermark to a video using firebase functions and ffmpeg, but I do know the right code for it. I know is that ffmpen is now available in google cloud env so this approach should work.
Any help is appreciated.

  


  const functions = require('firebase-functions');
const { Storage } = require('@google-cloud/storage');
const projectId = 'video-demo-a57fa';
let gcs = new Storage ({
  projectId
});
const os =require('os');
const path =require('path');
const spawn = require('child-process-promise').spawn;


exports.addLogo = functions.storage.object().onFinalize(event =>{
   
    const bucket =event.bucket;
    const contentType =event.contentType;
    const filePath =event.name;
    console.log(path.dirname(filePath));

    console.log('File change detected, function execution started');


    if (path.basename(filePath).startsWith('resized-')) {
        console.log('We already renamed that file!');
        return;
    }

    const destBucket = gcs.bucket(bucket);
    const tmpFilePath = path.join(os.tmpdir(), path.basename(filePath));
    const metadata = { contentType: contentType };
    return destBucket.file(filePath).download({
        destination: tmpFilePath
    }).then(()=>{
        return spawn('ffmpeg',['-i', 'video.mp4'], tmpFilePath )
    }).then(() => {
        console.log(tmpFilePath);
        return destBucket.upload(tmpFilePath, {
            destination: path.dirname(filePath)+'/resized-' + path.basename(filePath),
            metadata: metadata
            
        })
    }).catch(err=>{
        console.log(err);
    });
})