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• Why is long video taking long time before VideoJS player gets metadata to start playing ?

  7 mars 2015, par Tom Jenkinson

  Does anyone know why it is taking so long before the loadedmetadata event is fired for longer videos ?

  Here is an example : https://www.la1tv.co.uk/player/124/260

  I can see in developer tools that the file is still downloading when the event is fired, so it’s not like it’s having to download the whole file, it’s just having to get quite far though before the event is fired.

  The ffmpeg command I am using to encode the video from java is :

  RuntimeHelper.executeProgram(new String[] {config.getString("ffmpeg.location"), "-y", "-nostdin", "-timelimit", ""+config.getInt("ffmpeg.videoEncodeTimeLimit"), "-progress", ""+f.progressFile.getAbsolutePath(), "-i", source.getAbsolutePath(), "-vf", "scale=trunc(("+f.h+"*a)/2)*2:"+f.h, "-strict", "experimental", "-acodec", "aac", "-b:a", f.aBitrate+"k", "-ac", "2", "-ar", "48000", "-vcodec", "libx264", "-vprofile", "main", "-g", "48", "-b:v", f.vBitrate+"k", "-maxrate", f.vBitrate+"k", "-bufsize", f.vBitrate*2+"k", "-preset", "medium", "-crf", "16", "-vsync", "vfr", "-af", "aresample=async=1000", "-movflags", "+faststart", "-r", f.fr+"", "-f", "mp4", f.outputFile.getAbsolutePath()}, workingDir, null, null);

  which can be found here.

  It has the faststart flag set and I thought this meant the metadata would be inserted right at the beginning of the file ?

  Could it be an issue with the encode settings ?

  Thanks !

• Video created with ffmpeg won't play in video player

  11 octobre 2014, par user3180253

  I’m using Python to create a video using ffmpeg. The following code is what I’m using...

  import subprocess as sp
  
  import Image
  
  FFMPEG_BIN = "ffmpeg"
  
  
  
  commandWriter = [ FFMPEG_BIN,
  
                '-y',
  
                '-f', 'image2pipe',
  
                '-vcodec','mjpeg',
  
                '-s', '480x360', # size of one frame
  
                '-pix_fmt', 'rgb24',
  
                '-r', '29', # frames per second
  
                '-i', '-',
  
                '-an', # Tells FFMPEG not to expect any audio
  
                '-vcodec', 'mpeg4',
  
                '-qscale', '5',
  
                '-r', '29',
  
                '-b', '250',
  
                './fire.mp4' ]
  
  
  
  pipeWriter = sp.Popen(commandWriter, stdin=sp.PIPE)
  
  
  
  fps, duration = 24, 10
  
  for i in range(fps*duration):
  
     im = Image.new("RGB",(480,360),(i%250,1,1))
  
     im.save(pipeWriter.stdin, "JPEG")
  
  pipeWriter.stdin.close()
  
  pipeWriter.wait()
  
  
  
  pipeWriter.terminate()

  After running the above code, I get an output video with a data rate of 214 kbps. This video won’t play in Windows Media Player. At first I was at a loss of how to get the video to play, so I compared it to another video that I downloaded. I noticed the only real difference was in the bit rates/data rates. I ran this command from the command line...

  ffmpeg -i fire.mp4 -b:v 250k -bufsize 250k water.mp4

  which as I understand it takes fire.mp4 and simply outputs a new video with a modified bit rate. This new output works when I open it in Windows Media Player.

  The question I’m asking is how can I do this straight from Python ? I’ve tried adding a -b option to commandWriter (as shown) but this does not work. I’ve also added a bufsize = 10**8 in my pipeWriter but that does not work either.

  Overall what I’m trying to accomplish is taking a video input.mp4, modifying each frame as I load it in memory, and then writing that frame to a new file output.mp4. So far ffmpeg is looking like the best tool ’cause I can’t get OpenCV to work at all.

  So if anyone has a way to have a water.mp4 output file be able to run in Windows Media Player without needing to have that additional command line code run or a better way to complete my overall task, I would much appreciate that.

• JavaFX media issue on Ubuntu : Could not create player

  14 mai, par parsa2820

  I am trying to play mp3 file on JavaFX-11.0.2 on Ubuntu-20.04 using JDK-13.0.2 but I keep getting this same error every time. While I was searching for that I found that JavaFX uses older version of some libraries(See this issue on github). So I compiled and installed ffmpeg-3.1.11 from source. But the same exception is thrown. I put my code and error message bellow. I stuck on this for days so I really appreciate any help. Thanks.

  


  note : This is not duplicate qeustion. All other questions regarding to this error happend on different versions and had different causes. I tried most of them but none of them works for me.

  


  /usr/lib/jvm/jdk-13.0.2/bin/java --module-path /opt/javafx-sdk-11.0.2/lib --add-modules=javafx.controls,javafx.fxml,javafx.media -Djava.library.path=/opt/javafx-sdk-11.0.2/lib -javaagent:/opt/idea-IU-201.7846.76/lib/idea_rt.jar=46237:/opt/idea-IU-201.7846.76/bin -Dfile.encoding=UTF-8 -classpath /home/parsa/Documents/welanner/target/classes:/opt/javafx-sdk-11.0.2/lib/src.zip:/opt/javafx-sdk-11.0.2/lib/javafx-swt.jar:/opt/javafx-sdk-11.0.2/lib/javafx.web.jar:/opt/javafx-sdk-11.0.2/lib/javafx.base.jar:/opt/javafx-sdk-11.0.2/lib/javafx.fxml.jar:/opt/javafx-sdk-11.0.2/lib/javafx.media.jar:/opt/javafx-sdk-11.0.2/lib/javafx.swing.jar:/opt/javafx-sdk-11.0.2/lib/javafx.controls.jar:/opt/javafx-sdk-11.0.2/lib/javafx.graphics.jar:/home/parsa/.m2/repository/com/google/code/gson/gson/2.8.6/gson-2.8.6.jar view.GUI&#xA;Exception in Application start method&#xA;java.lang.reflect.InvocationTargetException&#xA;    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)&#xA;    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)&#xA;    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)&#xA;    at java.base/java.lang.reflect.Method.invoke(Method.java:567)&#xA;    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)&#xA;    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)&#xA;    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)&#xA;    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)&#xA;    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)&#xA;    at java.base/java.lang.reflect.Method.invoke(Method.java:567)&#xA;    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)&#xA;Caused by: java.lang.RuntimeException: Exception in Application start method&#xA;    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)&#xA;    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)&#xA;    at java.base/java.lang.Thread.run(Thread.java:830)&#xA;Caused by: MediaException: UNKNOWN : com.sun.media.jfxmedia.MediaException: Could not create player! : com.sun.media.jfxmedia.MediaException: Could not create player!&#xA;    at javafx.media/javafx.scene.media.MediaException.exceptionToMediaException(MediaException.java:146)&#xA;    at javafx.media/javafx.scene.media.MediaPlayer.init(MediaPlayer.java:518)&#xA;    at javafx.media/javafx.scene.media.MediaPlayer.<init>(MediaPlayer.java:421)&#xA;    at view.GUI.start(GUI.java:13)&#xA;    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)&#xA;    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)&#xA;    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)&#xA;    at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)&#xA;    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)&#xA;    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)&#xA;    at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)&#xA;    at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:277)&#xA;    ... 1 more&#xA;Caused by: com.sun.media.jfxmedia.MediaException: Could not create player!&#xA;    at javafx.media/com.sun.media.jfxmediaimpl.NativeMediaManager.getPlayer(NativeMediaManager.java:295)&#xA;    at javafx.media/com.sun.media.jfxmedia.MediaManager.getPlayer(MediaManager.java:118)&#xA;    at javafx.media/javafx.scene.media.MediaPlayer.init(MediaPlayer.java:474)&#xA;    ... 11 more&#xA;Exception running application view.GUI&#xA;&#xA;Process finished with exit code 1&#xA;</init>

  


  This is my code. I know path and other things are correct because I can run it on Windows properly.

  


  package view;

import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.stage.Stage;

import java.io.File;

public class GUI extends javafx.application.Application{
    public void start(Stage stage) throws Exception {
        String path = "/home/parsa/Music/Ninoush.mp3";
        Media media = new Media(new File(path).toURI().toString());
        MediaPlayer mediaPlayer = new MediaPlayer(media);
        mediaPlayer.setAutoPlay(true);
        stage.setTitle("Playing audio");
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}


  


  This is my ffmpeg and libraries versions :

  


  ffmpeg version 3.1.11 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
configuration: 
libavutil      55. 28.100 / 55. 28.100
libavcodec     57. 48.101 / 57. 48.101
libavformat    57. 41.100 / 57. 41.100
libavdevice    57.  0.101 / 57.  0.101
libavfilter     6. 47.100 /  6. 47.100
libswscale      4.  1.100 /  4.  1.100
libswresample   2.  1.100 /  2.  1.100


  


  Edit 3 : I can play wav file this way but I can't play mp3.