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• FFMPEG on Android java application

  11 juillet 2015, par Kim T

  I’m prototyping a Hybrid app using Cordova : https://cordova.apache.org. Also using this plugin : https://github.com/jbavari/cordova-plugin-video-editor

  The plugin renders a video into new formats using FFMPEG. The specific piece of code which does this is here :

  https://github.com/jbavari/cordova-plugin-video-editor/blob/master/src/android/VideoEditor.java

  al.add("ffmpeg");
  
  al.add("-i");
  
  al.add(videoSrcPath);
  
  String[] ffmpegCommand = al.toArray(new String[al.size()]);
  
  vk.run(ffmpegCommand, workFolder, appContext);
  
  Log.d(TAG, Arrays.toString(ffmpegCommand));

  When logged out in Android Studio with variables it is :

  [ffmpeg, -y, -i, /storage/emulated/0/DCIM/Camera/20150709_172753.mp4, -strict, experimental, -s, 320x320, -r, 24, -vcodec, libx264, -preset, ultrafast, -b, 2097152, -ac, 1, -ar, 22050, -t, 2.0, /storage/emulated/0/Movies/HelloWorld/VID_render-1436477283566.mp4]

  This is working perfectly.

  I want to modify this command to allow multiple videos, and other options. Here is an FFMPEG terminal command i’ve tested on my machine working :

  ./ffmpeg -i a.mp4 -i b.mp4 -filter_complex "[0:0] [0:1] [1:0] [1:1] concat=n=2:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" -loglevel debug -strict -2 output.mp4

  I’ve attempted to modify the java code but this fails :

  al.add("ffmpeg");
  
  al.add("-i");
  
  al.add(videoSrcPath); 
  
  al.add("-i");
  
  al.add(videoSrcPath2);
  
  al.add("-filter_complex");
  
  al.add("[0:0] [0:1] [1:0] [1:1] concat=n=2:v=1:a=1 [v] [a]");
  
  al.add("-map");
  
  al.add("[v]");
  
  al.add("-map");
  
  al.add("[a]");
  
  al.add("-strict");
  
  al.add("-2");

  This is the failing command when logged out with variables :

  [ffmpeg, -y, -i, /storage/emulated/0/DCIM/Camera/20150709_175137.mp4, -i, /storage/emulated/0/Movies/HelloWorld/20150709_234321.mp4, -filter_complex, [0:0] [0:1] [1:0] [1:1] concat=n=2:v=1:a=1 [v] [a], -map, [v], -map, [a], -strict, -2, experimental, -s, 320x320, -r, 24, -vcodec, libx264, -preset, ultrafast, -b, 2097152, -ac, 1, -ar, 22050, -t, 2.0, /storage/emulated/0/Movies/HelloWorld/VID_render-1436478706526.mp4]

  I try to use the logging feature of FFMPEG, I can’t get it to return back to the Java Log, which really restricts what I can debug :(

  al.add("-loglevel");
  
  al.add("debug");

  Any help would be greatly appreciated !

• java.io.IOException : Cannot append Mp4TrackImpl{handler='vide'} to Mp4TrackImpl{handler='vide'} since their Sample Description Boxes differ :

  6 février 2014, par Arslan Ahmad

  While Merging the multiple videos using ffmpeg I have got this Exception.

  java.io.IOException: Cannot append Mp4TrackImpl{handler='vide'} to Mp4TrackImpl{handler='vide'} since their Sample Description Boxes differ:

• Unwarping 180 VR Footage with FFmpeg v360 Filter

  5 avril 2021, par Ted Wilmont

  I am struggling at present. I have searched high and low for days and can't find a command that achieves what we want to do.

  


  We have stereoscopic 180 degrees VR footage in a side-by-side equirectangular format that we want to convert to flat so we can process using further AI software.

  


  We have already split the file in half across the width using FFmpeg so we have a "right" eye and a "left" eye video file.

  


  For each video file, we need to convert the 180-degree equirectangular footage to a flat, unwarped video file using FFmpeg (and the v360 filter).

  


  We've tried the following for example :

  


  ffmpeg -i 2LEFT.mp4 -vf "v360=input=equirect:ih_fov=180:iv_fov=180:output=flat" 2LEFTTEST.mp4


  


  However, this results in a very warped/misaligned video.

  


  Some command examples, tips, suggestions as to convert the now monoscopic 180-degree equirectangular footage to a flat video file will be greatly appreciated.

  


  Thank you for your help in advance.