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• 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 ?

  


• 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

• ffmpeg video conversion creates empty file when using php's exec()

  23 juillet 2014, par Rob Avery IV

  When I run ffmpeg with PHP’s exec() function to convert a video to flv, the flv file ends up empty. Here is the code I have that does the conversion :

      // Set our source file
  
      $srcFile = "/path/to/file/".$filename."mp4";
  
      $destFile = "/path/to/file/".$filename;
  
      $ffmpegPath = "ffmpeg";
  
  
  
      // Create our FFMPEG-PHP class
  
      $ffmpegObj = new ffmpeg_movie($srcFile);
  
  
  
      // Save our needed variables
  
      $srcWidth = makeMultipleTwo($ffmpegObj->getFrameWidth());
  
      $srcHeight = makeMultipleTwo($ffmpegObj->getFrameHeight());
  
      $srcFPS = $ffmpegObj->getFrameRate();
  
      $srcAB = intval($ffmpegObj->getAudioBitRate()/1000);
  
      $srcAR = $ffmpegObj->getAudioSampleRate();
  
  
  
      // Call our convert using exec()
  
      $command = $ffmpegPath . " -i " . $srcFile . " -ar " . $srcAR . " -ab " . $srcAB . "k -f flv -s " . $srcWidth . "x" . $srcHeight . " " . $destFile . "> /dev/null 2>/dev/null &";
  
      exec($command);

  Before I execute the code above, I have an mp4 file this is uploaded which is the one mentioned in the variable $srcFile. when uploaded, that file is not empty and I am to use it like a normal video file.

  Afterwards, there will be both filename.mp4 and filename (formated to flv video. yes, I’ve tried giving it an .flv extension and nothing different happens) files. filename ends up empty. To make sure it’s running the right command, I did an var_dump($command) to see the command that was actually running. I got this result :

  ffmpeg -i /path/to/file/filename.mp4 -ar 44100 -ab 70k -f flv -s 640x480 /path/to/file/filename

  I then run exec() function like this

  $output = "";
  
  exec($command, $output);
  
  var_dump($output);

  and like this

  $output = exec($command);
  
  var_dump($output);

  Both times, $output is presented as an empty array. Then, I run the ffmpeg command mentioned above through command line. And it worked. It created the flv file and it wasn’t empty and I was able to use as a regular video file with no problems.

  I also tried adding > /dev/null 2>/dev/null & at the end of the command and it still didn’t work.

  To sum up, so far, when ffmpeg is used to convert videos with php’s exec(), it creates the converted as an empty. Though, if I was to take the same command used with exec() and use it through command line, it works perfectly fine.

  I’m stumped. I’ve been tackling this for days and haven’t really gotten anywhere. Where I going wrong ? Is there a different or better way of doing this ? Am I missing something ?