title: Command for putting watermark on video
body: <p>I tried to put watermark on one video but FFmpeg command won't execute and error code is 3037. I run the same code for trimming video and video is trimmed successfully so there is no issues with <code>inputpath</code> or <code>outputpath</code> also I have <code>ic_watermark.png</code> in assets folder. I tried with image from <code>Drawable</code> but same error code. </p>
  
  <p>So here is the command which I tried to run and put watermark in right corner:</p>
  
  <p><code>String[] cmd = new String[]{"-i", videoInputPath, "-i", imagePath, "-filter_complex", "overlay=main_w-overlay_w-5:main_h-overlay_h-5", videoOutPath };</code></p>
  
  <p>and this is the whole method:</p>
  
  <pre><code>private void executeFFmepg(String inputPath, String outputPath, String customCommand){
  final Command command = videoKit.createCommand()
          .overwriteOutput()
          .inputPath(inputPath)
          .outputPath(outputPath)
          .customCommand(customCommand)
          .experimentalFlag()
          .build();
   new AsyncCommandExecutor(command, this).execute(); 
   }
  </code></pre>
  
  <p>I used one library based on <code>FFmpeg</code>: <a href="https://github.com/inFullMobile/videokit-ffmpeg-android" rel="nofollow noreferrer">https://github.com/inFullMobile/videokit-ffmpeg-android</a>
  and description says that this is basically <strong>invoking FFmpeg main() with CLI arguments</strong>.</p>
  
  <p>This is what I get from <code>Log</code>:</p>
  
  <pre><code>ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
    built with gcc 4.8 (GCC)
    configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
    libavutil      55. 17.103 / 55. 17.103
    libavcodec     57. 24.102 / 57. 24.102
    libavformat    57. 25.100 / 57. 25.100
    libavdevice    57.  0.101 / 57.  0.101
    libavfilter     6. 31.100 /  6. 31.100
    libswscale      4.  0.100 /  4.  0.100
    libswresample   2.  0.101 /  2.  0.101
    libpostproc    54.  0.100 / 54.  0.100
  05-29 15:35:08.591 24037-24037/com.cleatchaser D/FFmpeg: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/DCIM/Camera/20180406_140202.mp4':
    Metadata:
      major_brand     : isom
      minor_version   : 0
  05-29 15:35:08.596 24037-24037/com.cleatchaser D/FFmpeg:     compatible_brands: isom3gp4
      creation_time   : 2018-04-06 12:02:25
    Duration: 00:00:15.06, start: 0.000000, bitrate: 17185 kb/s
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 17029 kb/s, 29.95 fps, 30 tbr, 90k tbn, 180k tbc (default)
  05-29 15:35:08.601 24037-24037/com.cleatchaser D/FFmpeg:     Metadata:
        rotate          : 90
        creation_time   : 2018-04-06 12:02:25
        handler_name    : VideoHandle
      Side data:
  05-29 15:35:08.606 24037-24037/com.cleatchaser D/FFmpeg:       displaymatrix: rotation of -90.00 degrees
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 123 kb/s (default)
      Metadata:
        creation_time   : 2018-04-06 12:02:25
  05-29 15:35:08.611 24037-24037/com.cleatchaser D/FFmpeg:       handler_name    : SoundHandle
  05-29 15:35:08.756 24037-24037/com.cleatchaser D/FFmpeg: Input #1, png_pipe, from '/storage/emulated/0/watermark.png':
    Duration: N/A, bitrate: N/A
      Stream #1:0: Video: png, rgba(pc), 856x1324, 25 tbr, 25 tbn, 25 tbc
  </code></pre>
  
  <p>I tried many answers from similar questions but none of them worked. </p>
  
  <p>Is possible that error is in quotes? </p>
  
  <p>I don't have experience with FFmpeg so any help would be very appreciated. Thanks</p>