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Médias (3)
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Exemple de boutons d’action pour une collection collaborative
27 février 2013, par
Mis à jour : Mars 2013
Langue : français
Type : Image
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Exemple de boutons d’action pour une collection personnelle
27 février 2013, par
Mis à jour : Février 2013
Langue : English
Type : Image
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Collections - Formulaire de création rapide
19 février 2013, par
Mis à jour : Février 2013
Langue : français
Type : Image
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Sur d’autres sites (6935)
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Problems decoding a gstreamer pipeline into images using node.js
18 septembre 2023, par JK2018I have this Gstreamer pipeline that launches a test video , encodes it in h264 and sends it via udp on localhost 5000.


gst-launch-1.0 -v videotestsrc ! videoconvert ! x264enc tune=zerolatency ! h264parse ! queue ! rtph264pay ! udpsink host=127.0.0.1 port=5000


I run this pipeline in my terminal.


Then I have a minimalistic node.js server that is suposed to receive the udp stream coming from the gstreamer pipeline, decode the video into images.
Finally I emit each image (not a fragment of an image) over a socket.


I have tried several approaches unsuccessfully.
My first attempt was using a node gstreamer library and use gstreamer to decode the udp and re encode as images.


My second attempt was using ffmpeg library.
Here is the code below :


const express = require("express");
const http = require("http");
const { Server } = require("socket.io");
const socketIO = require("socket.io");
const cors = require("cors");
const app = express();
const server = http.createServer(app);
const dgram = require("dgram");
const ffmpeg = require("fluent-ffmpeg");

const io = socketIO(server, {
 cors: {
 origin: "http://localhost:3001",
 methods: ["GET", "POST"],
 },
});

app.use(
 cors({
 origin: "http://localhost:3001",
 methods: ["GET", "POST"],
 })
);

const udpServer = dgram.createSocket("udp4");

io.on("connection", (socket) => {
 console.log("A client connected");

 socket.on("disconnect", () => {
 console.log("A client disconnected");
 });
});

// Function to decode an H.264 video frame
function decodeH264Video(inputData, callback) {
 const command = ffmpeg()
 .input(inputData)
 .inputFormat("h264")
 .inputOptions(["-c:v h264"])
 .toFormat("image2")
 .on("end", () => {
 console.log("Decoding complete");
 })
 .on("error", (err) => {
 console.error("Error decoding video:", err);
 })
 .pipe();

 callback(command);
}

// Function to convert a decoded video frame to an image (JPEG format)
function convertVideoFrameToImage(decodedData, callback) {
 const imageStream = decodedData.pipe();
 const imageBuffer = [];

 imageStream.on("data", (chunk) => {
 imageBuffer.push(chunk);
 });

 imageStream.on("end", () => {
 const imageData = Buffer.concat(imageBuffer);
 callback(imageData);
 });
}

udpServer.on("message", (message) => {
 // Decode the UDP packet containing H.264 encoded video
 decodeH264Video(message, (decodedVideo) => {
 // Process the decoded video frame and convert it to an image
 convertVideoFrameToImage(decodedVideo, (imageData) => {
 // Send the image data to connected clients
 io.sockets.emit("image", { imageData: imageData.toString("base64") });
 });
 });
});

udpServer.bind(5000);

server.listen(3000, () => {
 console.log("Server is running on port 3000");
});


Any help is more than welcome


-
FFmpeg zoompan animation results in zig-zag pattern [closed]
2 février 2024, par kregusplease assist, as I am pulling my hair out !


The goal is for a user to specify a zoomPoint in a video as follows :


{
 "scale":4, # Scale factor, here x4
 "offset":0, # Start zooming in after 0ms
 "duration":5000, # Stay zoomed in for 5000ms
 "marginX":80, # Zoom x to 80% of video width 
 "marginY":10 # Zoom y to 10% of video height
}


I am running the following, simplified FFmpeg command :


ffmpeg -i "/tmp/input.mp4" -c:v libx264 -r 30 -vf "scale=iw*2:ih*2,zoompan=fps=30:z='if(gte(it,0.0)*lt(it,5.0), min(pzoom+0.2, 4),if(gte(it,5.0)*lt(it,5.5), max(pzoom-0.2, 1), 1))':d=1:s=1512x982:x='(iw - iw/4)*(80/100)':y='(ih - ih/4)*(10/100)'" /tmp/output.mp4


The animation duration is
0.5s, the video framerate is30fps, and so there are0.5 / (1/30) = 15animation frames.

Zoom distance is
scale - 1 = 3in this case, which makes the zoom increment3 / 15 = 0.2.

This results in the following example video : click here


While the zoom animation ends in the correct position, you will notice it arrives at that position in a zig-zag pattern, where it starts by zooming into the top-right corner, before changing direction towards the correct position.


I cannot seem to figure out how to get it to animate the zoom in a straight line to the specified x/y position.


Any tips are welcome, thanks !


-
FFmpeg Wasm, error while creating video from canvas
12 octobre 2023, par NineCattoRulesI'm using ffmpeg.wasm in my Next.JS app.


Here my specs :


"@ffmpeg/ffmpeg": "^0.12.5",
"@ffmpeg/util": "^0.12.0",
"next": "^13.0.6",
"react": "^18.2.0",


I want to simply record a 5s video from a canvas, so I tried :


'use client'

import React, { useEffect, useRef, useState } from 'react';
import { FFmpeg } from '@ffmpeg/ffmpeg';
import { fetchFile } from '@ffmpeg/util';

const CanvasVideoRecorder = () => {
 const canvasRef = useRef(null);
 const videoChunksRef = useRef([]);
 const ffmpegRef = useRef(new FFmpeg({ log: true }));
 const [loaded, setLoaded] = useState(false);
 const [videoUrl, setVideoUrl] = useState(null);

 const load = async () => {
 await ffmpegRef.current.load({
 coreURL: '/js/ffmpeg-core.js',
 wasmURL: '/js/ffmpeg-core.wasm',
 });
 setLoaded(true);
 };

 useEffect(() => {
 const ctx = canvasRef.current.getContext('2d');
 function drawFrame(timestamp) {
 ctx.fillStyle = `rgb(${(Math.sin(timestamp / 500) * 128) + 128}, 0, 0)`;
 ctx.fillRect(0, 0, canvasRef.current.width, canvasRef.current.height);
 requestAnimationFrame(drawFrame);
 }
 requestAnimationFrame(drawFrame);
 }, []);

 const startRecording = async () => {
 const videoStream = canvasRef.current.captureStream(30);
 const videoRecorder = new MediaRecorder(videoStream, { mimeType: 'video/webm' });

 videoRecorder.ondataavailable = (event) => {
 if (event.data.size > 0) {
 videoChunksRef.current.push(event.data);
 }
 };

 videoRecorder.start();
 setTimeout(() => videoRecorder.stop(), 5000);

 videoRecorder.onstop = async () => {
 try {
 await ffmpegRef.current.writeFile('recorded.webm', await fetchFile(new Blob(videoChunksRef.current, { type: 'video/webm' })));

 await ffmpegRef.current.exec('-y', '-i', 'recorded.webm', '-an', '-c:v', 'copy', 'output_copy.webm');

 const data = await ffmpegRef.current.readFile('output_copy.webm');
 const url = URL.createObjectURL(new Blob([data.buffer], { type: 'video/webm' }));

 setVideoUrl(url);
 } catch (error) {
 console.error("Error during processing:", error);
 }
 };
 };

 return (
 <div>
 <canvas ref="{canvasRef}" width="640" height="480"></canvas>

 {loaded ? (
 <>

 <button>Start Recording</button>
 {videoUrl && <video controls="controls" src="{videoUrl}"></video>}
 >
 ) : (
 <button>Load FFmpeg</button>
 )}
 </div>
 );
};

export default CanvasVideoRecorder;


I don't know why but it catch an error :


ErrnoError: FS error


This error occurs when I do this :


await ffmpegRef.current.exec('-y', '-i', 'recorded.webm', '-an', '-c:v', 'copy', 'output_copy.webm');
const data = await ffmpegRef.current.readFile('output_copy.webm');


The
recorded.webmfile is written correctly and I can read it,ffmpegRef.currentis well defined, so what's wrong with my logic, why the exec command doesn't work ?

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