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• Anomalie #2063 : Bug avec notes de bas de page r17814

  10 mai 2011, par Michel Fraisse

  OK, j’ai trouvé le fautif Dans article.html de dist 2007 j’ai rajouté (#TEXTE pour avoir un décompte approximatif du nombre de mots de #TEXTE. Avec ça double, sans c’est correct ce qui semble normal et rassurant après (...)

• iOS - converting to fmp4 (from mp4/m4a) and streaming it

  13 février 2019, par ironRoei

  So I didn’t managed to find any code about this issue.
  I have recorded an mp4 file(audioFile.mp4) and now i want to stream it through socket , yet i have problem in converting.
  I know that there is the ffmpeg(https://www.ffmpeg.org/) platform yet i didn’t see any code of that.
  Would appreciate any idea.

  class ViewController: UIViewController {
  
  
  
  var requestManager = RequestManager()
  
  
  
  var socket: WebSocket?
  
  
  
  var audioRecorder: AVAudioRecorder!
  
  
  
  @IBOutlet weak var recordBtn: UIButton!
  
  
  
  @IBOutlet weak var playBtn: UIButton!
  
  
  
  var fileName: String = "audioFile.mp4"
  
  
  
  var soundRecorder: AVAudioRecorder?
  
  var soundPlayer: AVAudioPlayer?
  
  var audioSession = AVAudioSession.sharedInstance()
  
  
  
  override func viewDidLoad() {
  
      super.viewDidLoad()
  
      self.socket?.delegate = self
  
  
  
      setUpRecorder()
  
      playBtn.isEnabled = false
  
  
  
  }
  
  
  
  override func viewDidAppear(_ animated: Bool) {
  
      super.viewDidAppear(animated)
  
      self.audioSession = AVAudioSession.sharedInstance()
  
  
  
      do {
  
          try audioSession.setCategory(AVAudioSession.Category.playAndRecord, mode: .measurement, options: .defaultToSpeaker)
  
          try audioSession.setActive(true, options: .notifyOthersOnDeactivation)
  
      } catch {
  
          print(error)
  
      }
  
  }
  
  
  
  func getDocDirector() -> URL {
  
      let path = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
  
      return path[0]
  
  }
  
  
  
  func setUpRecorder() {
  
  
  
  
  
      let audioFileName = getDocDirector().appendingPathComponent(fileName)
  
  
  
      let recordSettings: [String: Any] = [AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
  
                                           AVEncoderAudioQualityKey: AVAudioQuality.max.rawValue,
  
                                           AVNumberOfChannelsKey: 1,
  
                                           AVEncoderBitRateKey: 16000,
  
                                           AVSampleRateKey: 16000]
  
  
  
      do {
  
          soundRecorder = try AVAudioRecorder(url: audioFileName, settings: recordSettings)
  
          soundRecorder?.delegate = self
  
          soundRecorder?.prepareToRecord()
  
      } catch {
  
         print(error)
  
      }
  
  }
  
  
  
  func setUpPlayer() {
  
      let audioFileName = getDocDirector().appendingPathComponent(fileName)
  
      do {
  
          soundPlayer = try AVAudioPlayer(contentsOf: audioFileName)
  
          soundPlayer?.delegate = self
  
          soundPlayer?.prepareToPlay()
  
          soundPlayer?.volume = 1.0
  
      } catch {
  
          print(error)
  
      }
  
  }
  
  
  
  @IBAction func recordAction(_ sender: Any) {
  
      if recordBtn.titleLabel?.text == "Record" {
  
          soundRecorder?.record()
  
          recordBtn.setTitle("Stop", for: .normal)
  
          playBtn.isEnabled = false
  
      } else {
  
          soundRecorder?.stop()
  
          recordBtn.setTitle("Record", for: .normal)
  
          playBtn.isEnabled = false
  
      }
  
  }
  
  
  
  @IBAction func playAction(_ sender: Any) {
  
      if playBtn.titleLabel?.text == "Play" {
  
          playBtn.setTitle("Stop", for: .normal)
  
          recordBtn.isEnabled = false
  
          setUpPlayer()
  
          soundPlayer?.play()
  
      } else {
  
          playBtn.setTitle("Play", for: .normal)
  
          recordBtn.isEnabled = false
  
      }
  
  }
  
  
  
  func openSocket() {
  
      getUrl(success: { [weak self] (url) in
  
          self?.socket = WebSocket(url: URL(string: url)!)
  
          self?.socket?.connect()
  
      }) { (e) in
  
          //
  
      }
  
  }
  
  }

• Require assistance with filtergraph contruction using ffmpeg

  6 janvier 2023, par D-MAN

  problem : I manually make videos, and have decided to make a program to automatically make the video for me. Here is an example of the videos that i am trying to achieve. E.g : (https://youtu.be/eVQ9ysp0Pj0) (videos are displayed at 19 seconds into the video). This is the desired result i am trying to achieve. I have the following filter graph that has most of the elements :

  


  exe = "-i " + file + " -i " + frame + " -i " + framestart + " -i " + frameEnd + " -i " + audioOverlay + " -filter_complex \"[0:v]pad="+mVideoWidth+":"+mVideoHeight+":576:0[vpad]; [vpad][1]overlay[vframed]; [vframed]split=3[vfr1][vfr2][vfr3]; [vfr1]reverse[vrev]; [vfr2][vrev][vfr3]concat=n=3,setpts=1*(PTS-STARTPTS)[vboom]; [vboom][2]overlay=enable='lte(t,2)'[vpreout]; [vpreout][3]overlay=enable='gte(t,"+msec+"*3*0.5-2)'\" -map 4:a -b:v 8000k -shortest -preset ultrafast -crf 23 " + file2.getAbsolutePath();


  


  The only elements which i am struggling with is the sections that speed up momentarily and then return back to normal speed. it speeds up and returns to normal speed twice when the video plays forward, then reverses, then has the speed up effect twice while the video plays backwards. it speeds up for 1 second then continues playing the video at normal speed. Your help is greatly appreciated !

  


  I have tried setpts=1*(PTS-STARTPTS)[vrev] and other sections of the filter graph, but im relatively new to ffmpeg and do not completely understand how it all works. I have tried the following links too. https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video & https://video.stackexchange.com/questions/21800/ffmpeg-slow-fast-motion-part-a-video-anywhere