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• Android FFMPEG : Could not execute the ffmpeg from Java code

  23 septembre 2013, par Raj

  I am working on an Android app where I want to create a video from a
  list of static images. After doing some search on internet, it made me
  realized that using "FFMPEG" is the way to go in getting this thing
  done. So I got hold of this site :
  https://github.com/guardianproject/android-ffmpeg-java from where I
  downloaded the C library and the Java wrapper. I was able to compile the
  C library - of course not the way the instruction was laid out - but
  still I was able to get "ffmpeg" executable under
  /external/android-ffmpeg/ffmpeg directory. I copied that executable in
  my current directory and then copied it to a directory under Android
  where my app can access it. Then I called the provided Java wrapper but
  I am seeing some errors in the log file like follows :

  08-13 11:55:37.848: D/FFMPEG(29598): /data/data/com.sample/app_bin/ffmpeg -y -loop 1 -i /storage/emulated/0/usersnapshot/ffmpeg/image%03d.jpg -r 25 -t 2 -qscale 5 /storage/emulated/0/video/snapshot-video.mp4 
  
  08-13 11:55:37.898: I/ShellCallback : shellOut()(29598): /data/data/com.sample/app_bin/ffmpeg[1]: syntax error: '(' unexpected
  
  08-13 11:55:37.938: I/ShellCallback : processComplete()(29598): 1

  And following is the code snippet (where targetDirectoryForFFMPEG = directory where the images are stored) :

  FfmpegController ffmpegController = new FfmpegController(this, targetDirectoryForFFMPEG);
  
  String out = videoOutPutFile.getPath();
  
          MediaDesc mediaIn = new MediaDesc();
  
          mediaIn.path = targetDirectoryForFFMPEG+"/image%03d.jpg";
  
          mediaIn.videoFps =  "25";   
  
          ffmpegController.convertImageToMP4(mediaIn, 2, out,new ShellCallback() {
  
  
  
              @Override
  
              public void shellOut(String shellLine) {
  
                  Log.i("ShellCallback : shellOut()", shellLine);
  
              }
  
  
  
              @Override
  
              public void processComplete(int exitValue) {
  
                  Log.i("ShellCallback : processComplete()", exitValue+"");
  
              }
  
          });

  Has anybody implemented this before ? If yes, can you point me to what am I doing incorrect ? I will provide more information if needed.

• ffmpeg ideal format to convert videos using ffmpeg

  27 octobre 2013, par Offboard

  well the thing is, I intend to do a conversion of videos in the following qualities 240p, 360, 480p and 720p

  I researched a lot out there and got some codes to use, but there's something wrong some videos takes several hours to convert and shows this message.

  [libvo_aacenc @ 000000000032a0a0] Bitrate 32 is extremely low, maybe you mean 32k
  
  The bitrate parameter is set too low. It takes bits/s as argument, not kbits/s

  but some videos converts normally what I want is if someone has done some code that converts faster and is lighter in player jwplayer

  ffmpeg -i discovery_channel.webm -ar 22050 -ab 32 -f mp4 -s 640x240 -preset ultrafast video240.mp4
  
  
  
  ffmpeg -i discovery_channel.webm -ar 22050 -ab 32 -f mp4 -s 640x360 video360.mp4
  
  
  
  ffmpeg -i FIDELIDADE.mp4 -ar 22050 -ab 32 -f flv -s 640x720 -preset ultrafast video720.mp4
  
  
  
  ffmpeg -i FIDELIDADE.mp4 -s hd720 -c:v libx264 -crf 23 -c:a aac -strict -2 video720.mp4
  
  
  
  ffmpeg -i discovery_channel.webm -s hd720 -c:v libx264 -crf 23 -c:a aac -strict -2 video360.mp4

  the last code I like most because it makes the conversion from vertical to 720 pixels, and does nothing in the horizontal video.

  I tested several codes, when some take too much when video with the extension "webm"

  anyway if someone has a good code that works in jwplayer and is unversão serves to any video.

• Adding a border to ffmpeg video [ffmpeg-python]

  17 décembre 2019, par GRS

  I am making a xmas card and I need to embed the video inside a card on the right (inside the border) and have some text displayed on the left.

  For simplicity, let’s assume I have a box with a hole which is transparent. I would like to display the video inside that hole.

  I am using ffmpeg-python and it would be great to see examples of how it can be achieved. It’s also fine to post a native ffmpeg solution, although there are some example of that I believe already.

  From what I understand, I need to always start with a master node e.g. the biggest node, and place the video inside the hole.

  However, when I try something like :

  import ffmpeg
  
  
  
  in_file = ffmpeg.input('video.mp4')
  
  border_box = ffmpeg.input('box.png')
  
  
  
  
  
  (
  
      ffmpeg.overlay(
  
          border_box, in_file, x=50, y=50
  
      )
  
      .output('out.mp4')
  
      .run()
  
  )

  It doesn’t work. But vice versa, e.g. putting a border box inside the video doesn’t work as it overlays borders of the video.

  What I think needs to be done

  1. Create an infinite video from a static box.png
  2. Overlay, while scaling both streams appropriately
  3. Create output

  Here is what I’m trying to achieve :
  

  The reason for transparency is because it’s not actually a rectangle. I could place a video inside a heart shape etc.