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• Hello i need a some istructions to use ffmpeg, I would like a code to get media file info

  16 juillet 2014, par user3547175

  I want to start by saying that i don’t know how to use FFMPEG in C#. I have a program that reads the information of a media file, I use this code about resolution, bitrate

  var player = new WindowsMediaPlayer();
  
  var clip = player.newMedia(file.FullName);
  
  lblLenght_.Text = (TimeSpan.FromSeconds(clip.duration)).ToString();       
  
  
  
  
  
  
  
  ShellFile shellFile = ShellFile.FromFilePath(file.FullName);
  
  lblFPS_.Text = (shellFile.Properties.System.Video.FrameRate.Value / 1000).ToString();
  
  
  
  lblHeight_.Text = shellFile.Properties.System.Video.FrameHeight.Value.ToString() + " px";
  
  lblWidth_.Text = shellFile.Properties.System.Video.FrameWidth.Value.ToString() + " px";
  
  lblResolution_.Text = shellFile.Properties.System.Video.FrameWidth.Value.ToString() + "x" + shellFile.Properties.System.Video.FrameHeight.Value.ToString() + " px";
  
  blBitrate_.Text = (shellFile.Properties.System.Video.TotalBitrate.Value / 1000).ToString() + " kb/s";

  but the problem is that ShellFile supports only a few formats, so I found some FFMPEG uses but I don’t know how to work with it. Can someone post the solution or some link to learn how to use it about my problem ?

• FFmpeg throws exception while process the commands

  4 juin 2014, par Arslan Ahmad

  I am executing commands through process but it always throw this error anyone help me ?

  FFMPEGCommand :

      String[] ffmpegCommand = {"/data/data/com.example.app/ffmpeg", "-r", ""+VIDEO_FRAME_RATE, "-b", "1000", "-vcodec", "mjpeg", "-i", Environment.getExternalStorageDirectory().getPath() + "/com.example.app/frame_%05d.jpg", Environment.getExternalStorageDirectory().getPath() + "/video.mov"};
  
  
  
      ffmpegProcess = new ProcessBuilder(ffmpegCommand).redirectErrorStream(true).start();            
  
  
  
  W/System.err(29844): java.io.IOException: Error running exec(). Command: [/data/data/com.example.app/ffmpeg, -r, 18, -b, 1000, -vcodec, mjpeg, -i, /storage/emulated/0/com.example.app/frame_%05d.jpg, /storage/emulated/0/video.mov] Working Directory: null Environment: [ANDROID_ROOT=/system, EMULATED_STORAGE_SOURCE=/mnt/shell/emulated, LOOP_MOUNTPOINT=/mnt/obb, EMULATED_STORAGE_TARGET=/storage/emulated, ANDROID_BOOTLOGO=1, LD_LIBRARY_PATH=/vendor/lib:/system/lib, EXTERNAL_STORAGE=/storage/emulated/legacy, ANDROID_SOCKET_zygote=11, ANDROID_DATA=/data, PATH=/sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin, ANDROID_ASSETS=/system/app, ASEC_MOUNTPOINT=/mnt/asec, BOOTCLASSPATH=/system/framework/core.jar:/system/framework/conscrypt.jar:/system/framework/okhttp.jar:/system/framework/core-junit.jar:/system/framework/bouncycastle.jar:/system/framework/ext.jar:/system/framework/framework.jar:/system/framework/framework2.jar:/system/framework/telephony-common.jar:/system/framework/voip-common.jar:/system/framework/mms-common.jar:/system/framework/android.policy.jar:/system/framework/services.jar:/system/framework/apache-xml.jar:/system/framework/webviewchromium.jar:/system/framework/oem-services.jar:/system/framework/qcmediaplayer.jar, ANDROID_PROPERTY_WORKSPACE=9,0, ANDROID_STORAGE=/storage]
  
  06-02 12:21:36.660: W/System.err(29844):    at java.lang.ProcessManager.exec(ProcessManager.java:211)
  
  06-02 12:21:36.660: W/System.err(29844):    at java.lang.ProcessBuilder.start(ProcessBuilder.java:195)
  
  06-02 12:21:36.662: W/System.err(29844):    at com.example.app.FFMPEGRecorderActivity$ProcessVideo.doInBackground(FFMPEGRecorderActivity.java:1448)
  
  06-02 12:21:36.662: W/System.err(29844):    at com.example.app.FFMPEGRecorderActivity$ProcessVideo.doInBackground(FFMPEGRecorderActivity.java:1)
  
  06-02 12:21:36.662: W/System.err(29844):    at android.os.AsyncTask$2.call(AsyncTask.java:288)
  
  06-02 12:21:36.663: W/System.err(29844):    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
  
  06-02 12:21:36.663: W/System.err(29844):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
  
  06-02 12:21:36.663: W/System.err(29844):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
  
  06-02 12:21:36.663: W/System.err(29844):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
  
  06-02 12:21:36.663: W/System.err(29844):    at java.lang.Thread.run(Thread.java:841)
  
  06-02 12:21:36.664: W/System.err(29844): Caused by: java.io.IOException: No such file or directory
  
  06-02 12:21:36.665: W/System.err(29844):    at java.lang.ProcessManager.exec(Native Method)
  
  06-02 12:21:36.666: W/System.err(29844):    at java.lang.ProcessManager.exec(ProcessManager.java:209)
  
  06-02 12:21:36.667: W/System.err(29844):    ... 9 more

• Batch concatenate pairs of videos

  19 février 2021, par dellyice

  I have a directory with 1000+ video files. I'd like to concatenate them two-by-two.

  


  An alphabetical ordering of the files give the desired pairs, e.g., the input files

  


   filename_1.mp4
 filename_2.mp4
 filename_3.mp4
 filename_4.mp4
 ...


  


  should result in output files

  


   filename_1-2.mp4
 filename_3-4.mp4
 ...


  


  They input files all have the same dimensions and formats.

  


  How can I write a batch script invoking ffmpeg to achieve this ?