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• How to create a blank mp3 using ffmpeg ?

  11 mai 2017, par Vrushank Upadhyay

  I have built ffmpeg for android by using android NDK. I am using cocos game-engine to compile and run the project. I want to create a blank mp3 of lets say 20 seconds when a button is pressed. I have tried almost everything. The following command generates an output file but it is of 0 bytes.

  ffmpeg -f lavfi -i anullsrc=r=48000 -t 20 -codec copy /sdcard/output.mp3 

  My ffmpeg configuration is :

  > ./configure \
  
  >     --prefix=$PREFIX \
  
  >     --disable-network \
  
  >     --disable-doc \
  
  >     --disable-ffplay \
  
  >     --disable-ffprobe \
  
  >     --disable-ffserver \
  
  >     --disable-symver \
  
  >     --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
  >     --target-os=linux \
  
  >     --arch=arm \
  
  >     --enable-cross-compile \
  
  >     --sysroot=$SYSROOT \
  
  >     --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
  >     --extra-ldflags="$ADDI_LDFLAGS" \

  Any help would be appreciated. I am testing this on an android phone. I have built static libraries for ffmpeg and they are linked to the project.

• how to create video file with image and audio using ffmpeg library

  12 août 2013, par BlueG

  I want to merge IMAGE + AUDIO and convert them into video using FFMPEG library. I also tried with some code snippet but it's not working properly.
  Please help.

  File mf = Environment.getExternalStorageDirectory();
  
     String livestream = mf+"/neutral.jpg";
  
     String folderpth = mf+"/navya.mp3";
  
     //String output="/home/saicomputer/game.mp4";
  
     String output = new File(Environment.getExternalStorageDirectory(),"video.mp4").getAbsolutePath();
  
     Log.i("Test", "Let's set output to " + output);
  
     String cmd="ffmpeg -i "+ livestream +" -i "+ folderpth +" -acodec copy "+ output;
  
      Log.e("chck plzzzzz", "after "+ cmd);
  
     //String jaiho="ffmpeg -i image8.jpg -i file.m4a -acodec copy test.mp4";
  
  
  
     try{
  
      //Process p =
  
       Runtime.getRuntime().exec(cmd);
  
  
  
     }
  
     catch(Exception e)
  
     {
  
         System.out.println("exception"+e);
  
     }

• how to add subtitle and watermark on multi videos at same time in ffmpeg ?

  16 novembre 2020, par shadymelad

  i want to know how to add sutitle and watermark for maulti videos on one folders by FFMPEG like game of thrones all episode ?
i make watermark for all folders one time by useing thie code

  


  


  for %i in ("C :\Users\fady\Downloads\convert*.mp4") do ffmpeg -i "%i"
-i C :\Users\fady\Downloads\convert\fady.png -filter_complex "overlay=main_w-overlay_w-10:10" -codec:a copy
"C :\Users\fady\Downloads\convert\new% ni.mp4"

  


  


  but i want to add subtitle on the code
any one can help ?

  


  update
i try this code

  


  


  ffmpeg -i .mkv -i Cima2u.png -filter_complex "[0]subtitles=.srt[v] ;[1][v]scale2ref=w='iw*10/100':h='ow/mdar'[wm][vid] ; [vid][wm]overlay=main_w-overlay_w-5:main_h-overlay_h-5" -preset fast % ni.mp4

  


  


  but this for one file if i want to make it for folder many files can i ?