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• PermissionError : [Errno 13] Permission denied : 'ffprobe' (AudioSegment)

  22 juin 2022, par AYA

  I am trying to get AudioSegment working on my local computer. After resolving some issues, I am stuck on a permission error that I cannot seem to resolve. Let me detail what I have done so far (so that the error is easy to detect) :

  


  I pip installed both ffprobe and ffmpeg. But when I import ffprobe, it raised ImportError: cannot import name 'FFProbe'. Thankfully, was able to fix it following a brilliant post here. But now when I run audio = AudioSegment.from_file(audioname), it raises the following error : PermissionError: [Errno 13] Permission denied: 'ffprobe'. Based on one of the comments here, I manually adjusted the permissions using (which I think is the maximum permission granted to a folder ?) :

  


  import os
import stat
os.chmod('/path/to/ffmpeg', stat.S_IRWXU)
os.chmod('/path/to/ffprobe', stat.S_IRWXU) 


  


  Just to be 100% sure, I then manually adjusted the permissions for all the files in ffmpeg and ffprobe folders using stat.S_IRWXU, but to no avail (also tried chmod 755). I also confirmed if execution permission was actually granted (using os.access(my_file, os.X_OK)) but still get the same error. (Also changed the permission for the .mp3 file, no luck)

  


  Additional details :

  


  

  1. Based on a suggestion somewhere, I also added the following options right after importing AudioSegment :

  


  


  AudioSegment.converter = "/path/to/ffmpeg"
AudioSegment.ffmpeg = "/path/to/ffmpeg"
AudioSegment.ffprobe = "/path/to/ffprobe"


  


  

  2. There is also a runtime warning (that I don't think has anything to do with the error I get) but mentioning it here for completion :

  


  


  /opt/anaconda3/lib/python3.8/site-packages/pydub/utils.py:198: RuntimeWarning: Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work
  warn("Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work", RuntimeWarning)


  


  Thanks !

  


• How to convert the stream from h265 to h264

  12 avril 2021, par Hrithik Anchaliya

  I'm trying to create a media server using nodejs, and i have no problem streaming any formats but
Since web browsers cant play H265 codec videos i need to convert them to H264 while createReadStream creates a chunk so that i dont have to convert them completely before hand, just that chunk which is sent by the server to the browser.

  


  const path = 'assets/yourfavmov.mkv';
const stat = fs.statSync(path);
const fileSize = stat.size;
const range = req.headers.range;
if (range) {  
const rangeArray = range.replace(/bytes=/, "").split("-"); 
console.log(rangeArray) 
const start = parseInt(rangeArray[0], 10); 
const end = rangeArray[1] ? parseInt(rangeArray[1], 10) : fileSize-1; 
const chunksize = (end-start) + 1; 
const fileChunk = fs.createReadStream(path, {start, end});
const head = {
    'Content-Range': `bytes ${start}-${end}/${fileSize}`,  
    'Accept-Ranges': 'bytes', 
    'Content-Length': chunksize, 
    'Content-Type': 'video/x-matroska' 
};
res.writeHead(206, head); 
fileChunk.pipe(res); 
} else {
   res.end("wont let you stream");
}


  


  I tried to convert the stream using ffmpeg-stream, like so

  


  const converter = new Converter();
const input = converter.createInputStream({
      f: "matroska,webm",
      vcodec : "hevc"
})
const fileChunk = fs.createReadStream(path, {start, end}); 
fileChunk.pipe(input);
converter
  .createOutputStream({ f: "matroska,webm", vcodec: "h264" })
  .pipe(res);


  


  But i have no idea what i did is correct or wrong, so no luck
so is there an way to do it right ?

  


  Thanks in advance.

  


• Intercept ffmpeg stdout with Process() in Swift

  3 avril 2021, par TAFKAS

  I've to admit that I'm quite inexperienced in Swift, but nonetheless I'm trying to build an OS X app to convert a video in a particular format and size with ffmpeg using Swift.
My goal is to have the ffmpeg stdout in a separate window to show the progress to the user.
Before posting here, I've read all that exist on the internet about the subject :-) and I've not found yet a solution to my problem of not having any output whatsoever in my textView but only in the Xcode console.
I've found this post here :
Real time NSTask output to NSTextView with Swift
that seems very promising but is not working anyway. I've tried to use the command /bin/sh in the example with the provided arguments in my code and it works like a charm. Probably it's me and my inexperience, but I think that is something related to the way ffmpeg output his progress, that won't work. It seems that even removing the -v and -stat options the ffmpeg command still output to the Xcode console but not in my TextField.
I hope that someone can shed a light in my swift coding darkness.
Thanks in advance

  


  STEFANO

  


  UPDATE - SOLVED

  


  I had an EUREKA moment and I've assigned the pipe to the standarderror and voilà it worked

  


  import Cocoa

var videoLoadURL = ""

class ViewController: NSViewController {
   @IBOutlet weak var filenameLabel: NSTextField!
   @IBOutlet weak var progressText: NSTextField!
   @IBOutlet weak var progressIndicator: NSProgressIndicator!

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    progressIndicator.isHidden = true
    
}

@IBAction func loadVIdeo(_ sender: NSButton) {
    
    let openPanel = NSOpenPanel()
    openPanel.allowsMultipleSelection = false
    openPanel.canChooseFiles = true
    openPanel.runModal()
    
    if let path = openPanel.url?.lastPathComponent {
        
        filenameLabel.stringValue = path
    }
    
    if let path = openPanel.url?.absoluteURL {
        
        videoLoadURL = path.absoluteString

    }

}

@IBAction func convert(_ sender: NSButton) {
    
    progressIndicator.isHidden = false
    let savePanel = NSSavePanel()
    var videoSaveURL: String = ""
    savePanel.nameFieldStringValue = "Converted_\(filenameLabel.stringValue).mp4"
    savePanel.runModal()
    
    if let path = savePanel.url?.absoluteURL {
        
        videoSaveURL = path.absoluteString
    }

    let startLaunch: CFTimeInterval = CACurrentMediaTime()
    
    progressIndicator.startAnimation(self)
    
    let task = Process()
    task.launchPath = "/usr/local/bin/ffmpeg"
    task.arguments = ["-i", "\(videoLoadURL)", "-y", "-g", "1", "-crf", "29","-b", "0", "-pix_fmt", "yuv420p", "-strict", "-2", "\(videoSaveURL)"]
    let pipe = Pipe()
    task.standardError = pipe
    let outHandle = pipe.fileHandleForReading
    outHandle.waitForDataInBackgroundAndNotify()

    var observer1: NSObjectProtocol!
    observer1 = NotificationCenter.default.addObserver(forName: NSNotification.Name.NSFileHandleDataAvailable, object: outHandle, queue: nil, using: { notification -> Void in
        let data = outHandle.availableData
        if data.count > 0 {
            
            if let str = NSString(data: data, encoding: String.Encoding.utf8.rawValue) {
                
                self.progressText.stringValue = str as String
                
            }
            
            outHandle.waitForDataInBackgroundAndNotify()
            
        } else {
            
            print("EOF on stdout from process")
            NotificationCenter.default.removeObserver(observer1)
        }
        
    })

    var observer2: NSObjectProtocol!
    observer2 = NotificationCenter.default.addObserver(forName: Process.didTerminateNotification, object: task, queue: nil, using: { notification -> Void in
        
        print("terminated")
        NotificationCenter.default.removeObserver(observer2)

    })

    do {
        
        try task.run()
        
    }catch {
        
        print("error")
    }
    
    task.waitUntilExit()
    
    let elapsedTime: CFTimeInterval = CACurrentMediaTime() - startLaunch
    NSSound.beep()
    progressIndicator.stopAnimation(self)
    progressIndicator.isHidden = true
    if task.terminationStatus == 0 {
        
        let alertOK = NSAlert()
        alertOK.messageText = "Tutto bene"
        alertOK.addButton(withTitle:"OK")
        alertOK.addButton(withTitle: "Cancel")
        alertOK.informativeText = "Conversione eseguita in \(elapsedTime) secondi"
        alertOK.runModal()
        
    } else {
        
        let alertOK = NSAlert()
        alertOK.messageText = "Errore"
        alertOK.addButton(withTitle:"OK")
        alertOK.informativeText = "La conversione è fallita"
        alertOK.runModal()
        
    }
}


  


  }