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Error with FFmpeg and FS in React : "ErrnoError : FS error"
23 juillet 2024, par namwanI'm working on a React application where I'm using the @ffmpeg/ffmpeg library to compress images and videos. I'm facing an issue with the virtual file system (FS) when trying to read and write files using FFmpeg. I'm getting the following error :


ErrnoError: FS error


Here's the relevant part of my code :


import React, { useState } from "react";
import { FFmpeg } from "@ffmpeg/ffmpeg";

const ffmpeg = new FFmpeg();

const fetchFile = async (filePath) => {
 const file = await ffmpeg.readFile(filePath);
 alert("hello");
 return new Uint8Array(file).buffer;
};


const Main = () => {
 const [file, setFile] = useState(null);
 const [compressedFile, setCompressedFile] = useState("");

 const loadFFmpeg = async () => {
 if (!ffmpeg.isLoaded) {
 await ffmpeg.load();
 }
 }; 

 const getFile = (event) => {
 const selectedFile = event.target.files[0];
 
 if (selectedFile) {
 setFile(selectedFile);
 }
 };

 const compressImage = (selectedFile) => {
 const img = new Image();
 img.src = URL.createObjectURL(selectedFile);
 img.onload = () => {
 const canvas = document.createElement('canvas');
 const MAX_WIDTH = 300;
 const MAX_HEIGHT = 300;
 let width = img.width;
 let height = img.height;

 if (width > height) {
 if (width > MAX_WIDTH) {
 height *= MAX_WIDTH / width;
 width = MAX_WIDTH;
 }
 } else {
 if (height > MAX_HEIGHT) {
 width *= MAX_HEIGHT / height;
 height = MAX_HEIGHT;
 }
 }

 canvas.width = width;
 canvas.height = height;
 const ctx = canvas.getContext('2d');
 ctx.drawImage(img, 0, 0, width, height);
 const dataUrl = canvas.toDataURL('image/jpeg', 1.0);
 setCompressedFile(dataUrl);
 };
 };

 const compressVideo = async (selectedFile) => {
 try {
 await loadFFmpeg();
 
 const arrayBuffer = await selectedFile.arrayBuffer();
 const fileName = selectedFile.name;
 
 await ffmpeg.writeFile(fileName, new Uint8Array(arrayBuffer));
 
 await ffmpeg.exec(
 '-i',
 fileName,
 '-vf',
 'scale=640:-1',
 '-c:a',
 'aac',
 '-strict',
 '-2',
 'output.mp4'
 );
 
 const data = await fetchFile('output.mp4');
 const compressedVideoBlob = new Blob([data], { type: 'video/mp4' });
 const compressedVideoUrl = URL.createObjectURL(compressedVideoBlob);
 setCompressedFile(compressedVideoUrl);
 
 await ffmpeg.unlink(fileName);
 await ffmpeg.unlink('output.mp4');
 
 alert('Compression successful');
 } catch (error) {
 console.error('Error:', error);
 alert('Compression failed. Please check the console for more details.');
 }
 };
 

 const handleSubmit = async (e) => {
 e.preventDefault();

 if (file) {
 const fileType = file.name.split('.').pop().toLowerCase();

 if (fileType === 'png' || fileType === 'jpg' || fileType === 'jpeg') {
 compressImage(file);
 } else if (fileType === 'mp4' || fileType === 'h264') {
 compressVideo(file);
 } else {
 alert('Please select a valid file type (png, jpg, jpeg for images or mp4, h264 for videos).');
 }
 }
 };

 const handleDownload = () => {
 if (file) {
 const downloadLink = document.createElement('a');
 downloadLink.href = compressedFile;

 const fileExtension = file.name.split('.').pop().toLowerCase();

 downloadLink.download = `compressed_file.${fileExtension}`;
 
 document.body.appendChild(downloadLink);
 downloadLink.click();
 document.body.removeChild(downloadLink);
 }
 };

 return (
 <>
 <h1>Main Page</h1>
 <form>
 <label>Upload</label>
 <input type="'file'" />
 <br /><br />
 <input type="submit" value="Compress" />
 </form>
 {compressedFile && (
 <>
 <h2>Compressed File Preview</h2>
 {file && file.name && ( 
 file.name.split('.').pop().toLowerCase() === 'mp4' || file.name.split('.').pop().toLowerCase() === 'h264' ? (
 <video width="300" controls="controls">
 <source src="{compressedFile}" type="video/mp4"></source>
 Your browser does not support the video tag.
 </video>
 ) : (
 <img src="http://stackoverflow.com/feeds/tag/{compressedFile}" alt="Compressed file preview" style='max-width: 300px; max-height: 300px' />
 )
 )}
 <br /><br />
 <button>Download Compressed File</button>
 >
 )}
 >
 );
};

export default Main;


I'm using ffmpeg.readFile and ffmpeg.writeFile to read and write files to FFmpeg's virtual file system. I've also tried using ffmpeg.read and ffmpeg.write but still encounter the same issue.


Could someone please help me understand what might be causing this FS error and how to resolve it ?


-
C# Process in loop reading error output, causes "No async read operation is in progress on the stream" error
29 mai 2023, par TSLeeI am trying to read the format of multiple video files using ffmpeg in an asynchronous operation of Process and facing an error, "No async read operation is in progress on the stream". According to https://social.msdn.microsoft.com/Forums/vstudio/en-US/c961f461-7afb-4a92-b0ae-f78c2003b5de/help-an-asynchronous-read-operation-is-already-in-progress-on-the-standardoutput-stream?forum=csharpgeneral, I think I have to use CancelErrorRead(), as BeginErrorReadLine() can't be launched more than once. I also wonder if I use this function in the wrong place, because the read operation has ended in process1.exited() ? But the operation can't proceed to the second index with this error.


How could I use CancelErrorRead()/CancelOutputRead() properly and where should I place them on the code ? I also did an experiment in that I commented these two CancelRead(), and a different error "async read operation has been started on the stream" will appear.


Process process1 = new Process();
 process1.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
 process1.StartInfo.CreateNoWindow = true;
 process1.StartInfo.UseShellExecute = false;
 process1.StartInfo.FileName = ".\\ffmpeg.exe";
 process1.StartInfo.WorkingDirectory = ".\\";
 process1.EnableRaisingEvents = true;
 process1.StartInfo.RedirectStandardOutput = true; //if this is true, UseShellExecute must be false. true if output should be written to StandardOutput
 process1.StartInfo.RedirectStandardError = true;
 //indicates that the associated Process has written a line that's terminated with a newline
 process1.ErrorDataReceived += new DataReceivedEventHandler(inputHandler);
 process1.Exited += (ending, p) =>
 {
 flag = true;
 process1.CancelOutputRead();
 process1.CancelErrorRead();//
 };
 foreach (String file in inputList)
 {
 if (flag == true)
 {
 flag = false;
 process1.StartInfo.Arguments = "-i " + " \"" + file + "\"";
 Console.WriteLine(process1.StartInfo.Arguments);
 process1.Start();
 process1.BeginOutputReadLine();//
 process1.BeginErrorReadLine();
 process1.WaitForExit(); //for asynchronous output
 }


 }
 }
 private void inputHandler(object sender, DataReceivedEventArgs l)
 {
 cba.Append(l.Data + "\n");
 videoInput = l.Data;
 //Console.WriteLine(cba);
 //Process p = sender as Process;
 Console.WriteLine(videoInput);

 this.BeginInvoke(new MethodInvoker(() =>
 {

 if (!String.IsNullOrEmpty(videoInput))
 {
 if (videoInput.Contains("Stream #0:0"))
 {
 String subvideoInput1 = 
 videoInput.Substring(videoInput.IndexOf("Stream #0:0"));
 String video_inputType = subvideoInput1;
 textBox1.Text += video_inputType + System.Environment.NewLine;
 Console.WriteLine(video_inputType);
 }
 if (videoInput.Contains("Stream #0:1"))
 {
 String subvideoInput2 = 
 videoInput.Substring(videoInput.IndexOf("Stream #0:1"));
 Console.WriteLine(subvideoInput2.IndexOf("\n"));
 Console.WriteLine(subvideoInput2);
 String audio_inputType = subvideoInput2;
 textBox1.AppendText(audio_inputType + System.Environment.NewLine);
 Console.WriteLine(audio_inputType);
 }
 if (videoInput.Contains("Duration:"))
 {
 String videoinputDuration = 
 videoInput.Substring(videoInput.IndexOf("Duration:"));
 String subvideo_inputDuration = videoinputDuration.Substring(9);
 String inputvideoDuration = 
 subvideo_inputDuration.Remove(subvideo_inputDuration.IndexOf("."));
 Console.WriteLine(inputvideoDuration);
 double totalseconds = 
 TimeSpan.Parse(inputvideoDuration).TotalSeconds;
 
 

 }
 }

 }));


 }


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