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• FFMPEG : Add additional audio track to video file

  29 décembre 2016, par Lukas

  I have two video file with the following streams :

  File 1 :

  Stream #0:0(deu) : Audio : aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 126 kb/s (default)
  Stream #0:1(deu) : Audio : ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side), fltp, 384 kb/s
  Stream #0:2(eng) : Video : h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 4971 kb/s, 23.98 fps, 23.98 tbr, 2997 tbn, 5994 tbc (default)
  Stream #0:3 : Video : mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 480x480 [SAR 72:72 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
  

  File 2 :

  Stream #0:0(eng) : Audio : aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 126 kb/s (default)
  Stream #0:1(eng) : Audio : ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side), fltp, 384 kb/s
  Stream #0:2(eng) : Video : h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 4925 kb/s, 23.98 fps, 23.98 tbr, 23976 tbn, 47952 tbc (default)
  Stream #0:3(eng) : Subtitle : eia_608 (c608 / 0x38303663), 1920x1080, 0 kb/s
  Stream #0:4 : Video : mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 480x480 [SAR 72:72 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
  

  Both files have exactly the same video content , but the first video has a german audio track and the second one an english audio track.

  How can I extract the audio track from the german video file and add it to the english one, without losing the english subtitles and being able to choose between these audio tracks in a media player ?

  I searched about this and I found multiple answers to similar questions, but none of them worked : Some included only one audio track and some played both of them at the same time.

  _{I’m not sure if this question should be asked on Super User, but as there are alrealy many questions about ffmpeg on Stack Overflow, I asked it here.}

• ffmpeg.wasm DOMException : Failed to construct 'Worker' : Script at '/814.ffmpeg.js' cannot be accessed from origin ''

  18 mai 2024, par Quantum

  I have written a google chrome extension using local ffmpegwasm files (no need to run a server or download any ffmpegwasm files), which allows users to click an injected 'download' button under Reddit videos (via content_scripts). This was working great on ffmpegwasm v11, but since migrating to v12 (latest version) I have been unable to solve the following exception which is triggered during ffmpeg.load() : as seen in chrome's console log :

  


  DOMException: Failed to construct 'Worker': Script at 'https://www.redditstatic.com/814.ffmpeg.js' cannot be accessed from origin 'https://reddit.com'. At i.load (chrome-extension://ljejfmmefhnpbpdhkhbbajpihfhnbdnm/lib/ffmpeg/umd/ffmpeg.js:1:2918)


  


  I'm a programming beginner and I've been stuck trying to fix this for many, many hours. This exception does not happen and the video downloads if I instead use a feature of my extension which allows entering a Reddit video URL directly into a field in the extensions popup or options window. Also, I have no idea why the 814.ffmpeg.js file is being referenced along with redditstatic.com (from exception to exception, this url seems to randomly change to other reddit url's too), though I imagine this is part of the problem ?

  


  I have seen there are a couple of mentions of this error on the ffmpegwasm github repository, with some fixes involving using the worker814URL and/or classWorkerURL params within ffmpeg.load() and pointing them to the 814.ffmpeg.js file, which I have tried without any success (although I did notice that using classWorkerURL changed https://www.redditstatic.com/814.ffmpeg.js to chrome-extension://ljejfmmefhnpbpdhkhbbajpihfhnbdnm/lib/ffmpeg/umd/814.ffmpeg.js). Though, It seems that previous discussions around this error might not be too helpful for me as those appear geared towards ffmpegwasm running with a server, as apposed to entirely locally within a chrome extension.

  


  Any help would be super appreciated - many thanks

  


• Python video player using ffpyplayer.player with audio repeated crack issue at end of clip

  17 janvier 2021, par sunyaer

  I am using the codes below to do a video player. For video clips cut using this command : "ffmpeg -i PrideAndPrejudice.mp4 -ss 00:50:31 -t 00:03:30 OutPutPP.mp4", there is audio crack that keeps repeating a couple of times when the picture stops at the end of the video. I suspect there may be some issues with the codes of QTimer, but as I am quite new to Python and ffmpeg, and can't figure out what exactly the problem is, not to mention how to fix it. It would be greatly appreciated for your help.

  


      self.timer = QTimer()
    self.timer.setInterval(50)
    self.timer.start()
    self.timer.timeout.connect(self.showFrame)


  


  This is the whole codes :

  


   from ffpyplayer.player import MediaPlayer
 import sys
 from PyQt5.QtWidgets import *
 from PyQt5.QtGui import QPixmap, QImage, QImageReader
 from PyQt5.QtCore import QTimer

class MyApp(QWidget):
    def __init__(self, name, parent=None):
        super(MyApp, self).__init__(parent)
        self.label = QLabel()
        self.qimg = QImage()
        self.val = ''

        self.player = MediaPlayer("PrideAndPrejudice005030.mp4")
        self.timer = QTimer()
        self.timer.setInterval(50)
        self.timer.start()
        self.timer.timeout.connect(self.showFrame)

        layout = QVBoxLayout()
        layout.addWidget(self.label)
        self.setLayout(layout)
        self.setWindowTitle(name)

        # self.showFullScreen()

    def showFrame(self):
        frame, self.val = self.player.get_frame()
        if frame is not None:
            img, t = frame
            self.qimg = QImage(bytes(img.to_bytearray()[0]), img.get_size()[0], img.get_size()[1],
                               QImage.Format_RGB888)
            self.label.setPixmap(QPixmap.fromImage(self.qimg))


if __name__ == '__main__':
    app = QApplication(sys.argv)
    t = MyApp(sys.argv[0])
    t.show()
    sys.exit(app.exec_())