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• ffmpeg for a android (using tutorial : "ffmpeg and Android.mk")

  7 avril 2016, par Matthias

  I am trying to compile ffmpeg for a android. I have found several posts on this theme but non of these seems to work. If tried to build ffmpeg like it is posted on [1]. Did anybody successfully compile ffmpeg using theses tutorial? I am not sure how to realize step 4 to 5.

  STEP4: Configuring ...

  STEP5: cd to your NDK root dir, type make TARGET_ARCH=arm APP=ffmpeg-org

  It seems to me that building an application like it is explained in the tutorial in step 5 need some previous steps. Unfortunately I have no app in the folder to make. I am using the current android ndk release 3 and checked out the actual ffmpeg releases from [3] and [4]. I am thankful for every advice.

  [1] http://slworkthings.wordpress.com/
  [2] http://gitorious.org/~olvaffe/ffmpeg/ffmpeg-android
  [3] http://ffmpeg.org/download.html

• FFmpeg Executing command error

  7 avril 2016, par Sanket990

  When I conversion mp4 to mp3 using ffmpeg command
  FFmpeg command Execution error- Working directory null IOEXception Executing below code.

  File path=Environment.getExternalStorageDirectory();    
  try {
              String ffmpegCommand="ffmpeg -i "+path.getAbsolutePath()+"/test/1.mp4 -f avi -acodec mp3 "+path.getAbsolutePath()+"/Songss.avi";
                Process ffmpegProcess = new ProcessBuilder(ffmpegCommand).redirectErrorStream(true).start();
  
                String line;
                BufferedReader reader = new BufferedReader(new InputStreamReader(ffmpegProcess.getInputStream()));
                Log.d("tag", "*******Starting FFMPEG");
  
                while((line = reader.readLine())!=null){
  
                    Log.d("tag", "***"+line+"***"); 
                }
                Log.d("tag","****ending FFMPEG****");
  
          } catch (IOException e) {
              e.printStackTrace(); }
  

  LogCat

  java.io.IOException: Error running exec(). Command: [/data/data/com.example.ffmpegcommandexecute/ffmpeg -i /mnt/sdcard/Songs.mp4 -vn -s 00:00:10 -acodec libmp3lame output.mp3]
   Working Directory: null Environment: [ANDROID_SOCKET_zygote=10, ANDROID_BOOTLOGO=1, EXTERNAL_STORAGE=/mnt/sdcard, ANDROID_ASSETS=/system/app, PATH=/sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin, ASEC_MOUNTPOINT=/mnt/asec, LOOP_MOUNTPOINT=/mnt/obb, BOOTCLASSPATH=/system/framework/core.jar:/system/framework/core-junit.jar:/system/framework/bouncycastle.jar:/system/framework/ext.jar:/system/framework/framework.jar:/system/framework/android.policy.jar:/system/framework/services.jar:/system/framework/apache-xml.jar:/system/framework/filterfw.jar, EXTERNAL_STORAGE_SD=/mnt/ext_card, EXTERNAL_STORAGE_ALL=/mnt/sdcard:/mnt/ext_card, WTLE_VERSION=3.2.0.patch6.1, ANDROID_DATA=/data, LD_LIBRARY_PATH=/vendor/lib:/system/lib, ANDROID_ROOT=/system, ANDROID_PROPERTY_WORKSPACE=9,65536]
      at java.lang.ProcessManager.exec(ProcessManager.java:211)
      at java.lang.ProcessBuilder.start(ProcessBuilder.java:195)
      at com.example.ffmpegcommandexecute.MJPEGFFMPEGTest$ProcessVideo.doInBackground(MJPEGFFMPEGTest.java:301)
      at com.example.ffmpegcommandexecute.MJPEGFFMPEGTest$ProcessVideo.doInBackground(MJPEGFFMPEGTest.java:1)
      at android.os.AsyncTask$2.call(AsyncTask.java:264)
      at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
      at java.util.concurrent.FutureTask.run(FutureTask.java:137)
      at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
      at java.lang.Thread.run(Thread.java:856)
   Caused by: java.io.IOException: No such file or directory
      at java.lang.ProcessManager.exec(Native Method)
      at java.lang.ProcessManager.exec(ProcessManager.java:209)
  

• ffmpeg watermark

  7 avril 2016, par tomi

  I am using a static compiled lib of FFMPEG gotten from BAMBUSER for android. The problem I am facing now is that FFMPEG version gotten from BAMBUSER does not support watermarking.

  ffmpeg -sameq -i mirror_watermark.mp4 -vf "movie=mirror_watermark.png [logo]; [in][logo] overlay=main_w-overlay_w:main_h-overlay_h [out]" output.mp4
  No such filter: 'movie'
  
  ./configure --list-filters | grep movie
  returns nothing
  

  So I guess I have to use a newer version of FFMPEG but I do not know how to get started since with the BAMBUSER everything was already set I just added certain encoders and decoders to their script.

• How to calculate byte/index ranges for mpeg-dash MPD file ?

  7 avril 2016, par TheSHEEEP

  I basically know how an .mpd file would have to be structured to support streaming from separate .mp4 (or webm) files.

  However, I would like to implement the "static" (aka "on-demand") method, thus only having one file per quality that I want to offer in the stream.

  In all samples, this is done by supplying the indexRange & range values within a Representation like this:

  
          car-20120827-88.mp4
          
            
          
  
  

  What I could not find out anywhere is how one would calculate the indexRange/range values here, using only ffmpeg (or ffprobe).
  What exactly would one have to do to get those numbers right for arbitrary (yet supported, of course) video files to create the .mpd file for them?

  Or am I trying to figure out something in vain here and those values are just arbitrary?

• Can anyone help in understanding AVFrame.linesize[] ?

  7 avril 2016, par theateist

  I tried to find what each cell of AVFrame.linesize[] means, but I didn't found.

  As I understood linesize[0] is the width, linesize[1] is the height.

  1. If I'm right what does other cells mean?
  2. why after avcodec_decode_video2(codecCtxDecode, frameDecoded, &frameFinished, &packet); only linesize[0] has the value and other cells are always 0?

  UPDATED

  I think AVFrame.data[i] and AVFrame.linesize[i] are the data of specific color in the row and the length of the row, am I correct?