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• Add support for QT BMP 1bpp color mode

  12 mai 2011, par ami_stuff

  Add support for QT BMP 1bpp color mode

• How to compare the difference between 2 videos color in ffmpeg ?

  3 décembre 2014, par nico_lab

  I have read How to compare/show the difference between 2 videos in ffmpeg ? , but "blend=all_mode=difference" is green.
  How do I get more colorful diffrence using blend filter ?

  sample command is

  ffplay -f lavfi "movie=left.mp4,split[a1][a2]; movie=right.mp4,split[b1][b2]; [a1][b1]blend=all_mode=difference[blend];[a2]pad=2*iw:2*ih[left];[left][b2]overlay=w[tmp];[tmp][blend]overlay=0:h"

  using "hue=s=0", color is chenge monochrome.

  ffplay -f lavfi "movie=left.mp4,split[a1][a2]; movie=right.mp4,split[b1][b2]; [a1][b1]blend=all_mode=difference,hue=s=0[blend];[a2]pad=2*iw:2*ih[left];[left][b2]overlay=w[tmp];[tmp][blend]overlay=0:h"

  The goal is this video. if you have a niconico account.
  http://www.nicovideo.jp/watch/sm24864058

  if you don’t have a niconico account, embed page is
  http://www.nicozon.net/watch/sm24864058

• Upload screenshots to google cloud storage bucket with Fluent-ffmpeg

  2 janvier 2021, par aarpods

  I am currently using multer to upload videos to my google storage bucket, and fluent-ffmpeg to capture thumbnails of the videos. Videos are being uploaded into the buckets correctly, but not the thumbnails from ffmpeg. How can I change the location of the thumbnails to my google storage bucket ?

  


  Back-End Video upload

  


  require ('dotenv').config()
const express = require('express');
const router = express.Router();
const multer = require("multer");
var ffmpeg = require('fluent-ffmpeg');
const multerGoogleStorage = require('multer-google-storage');
const { Video } = require("../models/Video");
const {User} = require("../models/User")
const { auth } = require("../middleware/auth");


var storage = multer({
    destination: function (req, file, cb) {
        cb(null, 'videos/')
    },
    filename: function (req, file, cb) {
        cb(null, `${Date.now()}_${file.originalname}`)
    },
    fileFilter: (req, file, cb) => {
        const ext = path.extname(file.originalname)
        if (ext !== '.mp4' || ext !== '.mov' || ext !== '.m3u' || ext !== '.flv' || ext !== '.avi' || ext !== '.mkv') {
            return cb(res.status(400).end('Error only videos can be uploaded'), false);
        }
        cb(null,true)
    }
})
// Set location to google storage bucket
var upload = multer({ storage: multerGoogleStorage.storageEngine() }).single("file")

router.post("/uploadfiles", (req, res) => {

    upload(req, res, err => {
        if (err) {
            return res.json({sucess: false, err})
        }
        return res.json({ success: true, filePath: res.req.file.path, fileName: res.req.file.filename})
    })
});


  


  Back-end thumbnail upload

  


  router.post("/thumbnail", (req, res) => {

    let thumbsFilePath = "";
    let fileDuration = "";

    ffmpeg.ffprobe(req.body.filePath, function (err, metadata) {
        console.dir(metadata);
        console.log(metadata.format.duration);

        fileDuration = metadata.format.duration;
    })


    ffmpeg(req.body.filePath)
        .on('filenames', function (filenames) {
            console.log('Will generate ' + filenames.join(', '))
            thumbsFilePath = "thumbnails/" + filenames[0];
        })
        .on('end', function () {
            console.log('Screenshots taken');
            return res.json({ success: true, thumbsFilePath: thumbsFilePath, fileDuration: fileDuration })
        })
        //Can this be uploaded to google storage?
        .screenshots({
            // Will take 3 screenshots
            count: 3,
            folder: '/thumbnails/',
            size: '320x240',
            //Names file w/o extension
            filename:'thumbnail-%b.png'
        });
});


  


  Front-end video upload

  


   const onDrop = (files) => {
        let formData = new FormData();
        const config = {
            header: {'content-type': 'multipart/form-data'}
        }
        console.log(files)
        formData.append("file", files[0])

        axios.post('/api/video/uploadfiles', formData, config)
            .then(response => {
                if (response.data.success) {
                    let variable = {
                        filePath: response.data.filePath,
                        fileName: response.data.fileName
                    }
                    setFilePath(response.data.filePath)

                    //Thumbnail
                    axios.post('/api/video/thumbnail', variable)
                        .then(response => {
                            if (response.data.success) {
                                setDuration(response.data.fileDuration)
                                setThumbnail(response.data.thumbsFilePath)
                            } else {
                                alert("Failed to generate a thumbnail");
                            }
                        })

                } else {
                    alert('Failed to save video to the server')
                }
            })
    }