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• Flutter (Dart) : Merge two videos and view the new output in the device's gallery (photos)

  17 juin 2020, par Ittai Barkai

  I am aware that there already exists a solution to a very similar question, which can be found on the following link : Flutter/Dart : Find two video segments and merge them into a single valid video file ? However, being relatively new to Flutter (and programming in general) I cannot seem to replicate the desired result.

  



  My app is very simple and currently looks like this :

  



  

  



  I click on the button "Record Video" to record two videos, which are both successfully stored into the device's gallery. Using the Flutter image_picker and gallery_saver packages and the following piece of code :

  



      void _recordVideo() async {
    ImagePicker.pickVideo(source: ImageSource.camera)
        .then((File recordedVideo) {
      if (recordedVideo != null && recordedVideo.path != null) {
        setState(() {
          _buttonText = 'Saving in Progress...';
        });
        GallerySaver.saveVideo(recordedVideo.path).then((_) {
          setState(() {
            _buttonText = 'Video Saved!\n\nClick to Record New Video';
            if (_storedVideoOne == null) {
              _storedVideoOne = recordedVideo;
              print('video 1 stored');
            } else {
              _storedVideoTwo = recordedVideo;
              print('video 2 stored');
              _videoMerger();
            }
          });
        });
      }
    });
  }


  



  I can view these videos when I click on the button at the bottom "View Video From Gallery".

  



  Next I try to merge these two stored video files, using the flutter_ffmpeg package, as well as following the solution provided in the stack overflow question mentioned above. I try and do this using the following function I wrote :

  



  void _videoMerger() async {


    final appDir = await syspaths.getApplicationDocumentsDirectory();
    String rawDocumentPath = appDir.path;
    final outputPath = '$rawDocumentPath/output.mp4';

    final FlutterFFmpeg _flutterFFmpeg = new FlutterFFmpeg();

        String commandToExecute = '-i ${_storedVideoOne.path} -i ${_storedVideoTwo.path} -filter_complex \'[0:0][1:0]concat=n=2:v=1:a=0[out]\' -map \'[out]\' outputPath';
        _flutterFFmpeg.execute(commandToExecute).then((rc) => print("FFmpeg process exited with rc $rc"));

  }


  



  But after running the function I do not seem to get a new combined video, which should be stored in outputPath and ideally also viewable in the gallery. Uploaded the Flutter project onto GitHub here :

  



  https://github.com/IttaiBarkai/Flutter-Video-Merger

  



  Any help would be greatly appreciated :)

  



  Updated :

  



  Below is the output displayed on my debug console when ffmpeg gets executed :

  



  D/flutter-ffmpeg( 4146): Running FFmpeg with arguments: [-i, /storage/emulated/0/Android/data/com.example.video_merger_two/files/Pictures/d2b7a612-7c6d-48fe-8d06-85ceeb10e2f584195978113840656.mp4, -i, /storage/emulated/0/Android/data/com.example.video_merger_two/files/Pictures/b6cb83a3-10ac-49c7-80f3-3447bebe93ac5245748251872788895.mp4, -filter_complex, [0:0][1:0]concat=n=2:v=1:a=0[out], -map, [out], outputPath.mp4].
I/mobile-ffmpeg( 4146): ffmpeg version git-2020-01-25-fd11dd500
I/mobile-ffmpeg( 4146):  Copyright (c) 2000-2020 the FFmpeg developers
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):   built with Android (5220042 based on r346389c) clang version 8.0.7 (https://android.googlesource.com/toolchain/clang b55f2d4ebfd35bf643d27dbca1bb228957008617) (https://android.googlesource.com/toolchain/llvm 3c393fe7a7e13b0fba4ac75a01aa683d7a5b11cd) (based on LLVM 8.0.7svn)
I/mobile-ffmpeg( 4146):   configuration: --cross-prefix=i686-linux-android- --sysroot=/files/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/mobile-ffmpeg/prebuilt/android-x86/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=i686 --cpu=i686 --cc=i686-linux-android24-clang --cxx=i686-linux-android24-clang++ --target-os=android --disable-neon --disable-asm --disable-inline-asm --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --enable-shared --disable-v4l2-m2m --disable-outdev=v4l2 --disable-outdev=fbdev --disable-indev=v4l2 --disable-indev=fbdev --enable-small --disable-openssl --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --di
I/mobile-ffmpeg( 4146):   libavutil      56. 38.100 / 56. 38.100
I/mobile-ffmpeg( 4146):   libavcodec     58. 65.102 / 58. 65.102
I/mobile-ffmpeg( 4146):   libavformat    58. 35.101 / 58. 35.101
I/mobile-ffmpeg( 4146):   libavdevice    58.  9.103 / 58.  9.103
I/mobile-ffmpeg( 4146):   libavfilter     7. 70.101 /  7. 70.101
I/mobile-ffmpeg( 4146):   libswscale      5.  6.100 /  5.  6.100
I/mobile-ffmpeg( 4146):   libswresample   3.  6.100 /  3.  6.100
I/mobile-ffmpeg( 4146): Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/com.example.video_merger_two/files/Pictures/d2b7a612-7c6d-48fe-8d06-85ceeb10e2f584195978113840656.mp4':
I/mobile-ffmpeg( 4146):   Metadata:
I/mobile-ffmpeg( 4146):     major_brand     :
I/mobile-ffmpeg( 4146): mp42
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     minor_version   :
I/mobile-ffmpeg( 4146): 0
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     compatible_brands:
I/mobile-ffmpeg( 4146): isommp42
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     creation_time   :
I/mobile-ffmpeg( 4146): 2020-06-17T12:07:20.000000Z
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     com.android.version:
I/mobile-ffmpeg( 4146): 10
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):   Duration:
I/mobile-ffmpeg( 4146): 27:34:19.40
I/mobile-ffmpeg( 4146): , start:
I/mobile-ffmpeg( 4146): 0.000000
I/mobile-ffmpeg( 4146): , bitrate:
I/mobile-ffmpeg( 4146): 0 kb/s
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     Stream #0:0
I/mobile-ffmpeg( 4146): (eng)
I/mobile-ffmpeg( 4146): : Video: h264 (avc1 / 0x31637661), yuv420p(tv, GBR), 1280x720, 3536 kb/s
I/mobile-ffmpeg( 4146): , SAR 1:1 DAR 16:9
I/mobile-ffmpeg( 4146): ,
I/mobile-ffmpeg( 4146): 28.75 fps,
I/mobile-ffmpeg( 4146): 29.08 tbr,
I/mobile-ffmpeg( 4146): 90k tbn,
I/mobile-ffmpeg( 4146): 180k tbc
I/mobile-ffmpeg( 4146):  (default)
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     Metadata:
I/mobile-ffmpeg( 4146):       rotate          :
I/mobile-ffmpeg( 4146): 90
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):       creation_time   :
I/mobile-ffmpeg( 4146): 2020-06-17T12:07:20.000000Z
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):       handler_name    :
I/mobile-ffmpeg( 4146): VideoHandle
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     Side data:
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146): displaymatrix: rotation of -90.00 degrees
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     Stream #0:1
I/mobile-ffmpeg( 4146): (eng)
I/mobile-ffmpeg( 4146): : Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono, flt, 12 kb/s
I/mobile-ffmpeg( 4146):  (default)
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     Metadata:
I/mobile-ffmpeg( 4146):       creation_time   :
I/mobile-ffmpeg( 4146): 2020-06-17T12:07:20.000000Z
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):       handler_name    :
I/mobile-ffmpeg( 4146): SoundHandle
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146): Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/com.example.video_merger_two/files/Pictures/b6cb83a3-10ac-49c7-80f3-3447bebe93ac5245748251872788895.mp4':
I/mobile-ffmpeg( 4146):   Metadata:
I/mobile-ffmpeg( 4146):     major_brand     :
I/mobile-ffmpeg( 4146): mp42
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     minor_version   :
I/mobile-ffmpeg( 4146): 0
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     compatible_brands:
I/mobile-ffmpeg( 4146): isommp42
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     creation_time   :
I/mobile-ffmpeg( 4146): 2020-06-17T12:07:32.000000Z
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     com.android.version:
I/mobile-ffmpeg( 4146): 10
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):   Duration:
I/mobile-ffmpeg( 4146): 27:34:19.35
I/mobile-ffmpeg( 4146): , start:
I/mobile-ffmpeg( 4146): 0.000000
I/mobile-ffmpeg( 4146): , bitrate:
I/mobile-ffmpeg( 4146): 0 kb/s
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     Stream #1:0
I/mobile-ffmpeg( 4146): (eng)
I/mobile-ffmpeg( 4146): : Video: h264 (avc1 / 0x31637661), yuv420p(tv, GBR), 1280x720, 3561 kb/s
I/mobile-ffmpeg( 4146): , SAR 1:1 DAR 16:9
I/mobile-ffmpeg( 4146): ,
I/mobile-ffmpeg( 4146): 28.95 fps,
I/mobile-ffmpeg( 4146): 29 tbr,
I/mobile-ffmpeg( 4146): 90k tbn,
I/mobile-ffmpeg( 4146): 180k tbc
I/mobile-ffmpeg( 4146):  (default)
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     Metadata:
I/mobile-ffmpeg( 4146):       rotate          
:
I/mobile-ffmpeg( 4146): 90
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):       creation_time   :
I/mobile-ffmpeg( 4146): 2020-06-17T12:07:32.000000Z
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):       handler_name    :
I/mobile-ffmpeg( 4146): VideoHandle
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     Side data:
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146): displaymatrix: rotation of -90.00 degrees
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     Stream #1:1
I/mobile-ffmpeg( 4146): (eng)
I/mobile-ffmpeg( 4146): : Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono, flt, 12 kb/s
I/mobile-ffmpeg( 4146):  (default)
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):     Metadata:
I/mobile-ffmpeg( 4146):       creation_time   :
I/mobile-ffmpeg( 4146): 2020-06-17T12:07:32.000000Z
I/mobile-ffmpeg( 4146):
I/mobile-ffmpeg( 4146):       handler_name    :
I/mobile-ffmpeg( 4146): SoundHandle
I/mobile-ffmpeg( 4146):
E/mobile-ffmpeg( 4146): outputPath.mp4: Read-only file system
D/flutter-ffmpeg( 4146): FFmpeg exited with rc: 1
I/flutter ( 4146): FFmpeg process exited with rc 1


  


• ffmpeg only drawing last text

  24 juillet 2020, par Muhammad Mohsin Ajmal

  Im using ffmpeg in flutter using the flutter ffmpeg plugin. While experimenting with it this is what I am trying to do : Show text between 1 to 2 seconds and a different text between 3 to 4 seconds in video.

  


  Only the text mentioned between 3 to 4 seconds is shown. So for me only the last drawText would work. What am I missing here ?

  


  The is the list of arguments generated

  


   Running FFmpeg with arguments: [-y, -i, /storage/emulated/0/DCIM/Camera/20200707_234610.mp4, -i, /data/user/0/com.example.example/app_flutter/watermark.png, -filter_complex, [0:v][1:v]overlay=main_w-overlay_w-5:5 ,drawtext=fontfile='/data/user/0/com.example.example/app_flutter/font.ttf':fontsize=90:x=20:y=20:text='Testing':enable='between(t\,1\,2),drawtext=fontfile='/data/user/0/com.example.example/app_flutter/font.ttf':fontsize=90:x=20:y=260:text='OTHER TEXT':enable='between(t\,3\,4)'', -crf, 27, -preset, veryfast, -c:v, libx264, -r, 30, /data/user/0/com.example.example/cache/2020-07-21T07:50:39.206386.mp4]



  


• Does exists other way of indenting ffmpeg batch script ?

  22 mars 2021, par Toni Cambronero Garcia

  How can I indent code in a Batch script other than using temporal variables %= =% ?
This is the only code that works for me with indentation.

  


  ::2020-12-31 10:43:40
@ECHO OFF
::SET VIDEO="E:\Vídeos\test.mp4"
SET VIDEO=%1
SET /P TITULO=Introduzca el título del vídeo: 
ffmpeg ^
    -y ^
    -loglevel verbose ^
    -i %VIDEO% ^
    -vf ^
          scale=^
%=          =%width=-2:^
%=          =%height=360,^
%=      =%drawtext=^
%=          =%fontfile='C\:/Windows/Fonts/impact.ttf':^
%=          =%text=%TITULO%:^
%=          =%fontcolor=white:^
%=          =%borderw=1:^
%=          =%fontsize=18:^
%=          =%alpha=0.99:^
%=          =%x=(w-tw)/2:^
%=          =%y=th/4:^
%=          =%expansion=none,^
%=      =%drawtext=^
%=          =%fontfile='C\:/Windows/Fonts/arial.ttf':^
%=          =%text='WATERMARK':^
%=          =%fontcolor=white:^
%=          =%borderw=1:^
%=          =%fontsize=18:^
%=          =%alpha=0.60:^
%=          =%x=w-tw-10:^
%=          =%y=h-th-10:^
%=          =%expansion=none^
    -map 0:v ^
    -map 0:a? ^
    -c:v h264 ^
    -crf 30 ^
    -c:a aac ^
    -q:a 1 ^
    -ac 1 ^
    %VIDEO:~0,-5%_WATERMARK.mp4


  


  If I try to use spaces or tabs in the "-vf" section ffmpeg interprets them as the end of the filter and the start of the output file argument .