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  • Make a duet video like tiktok

    27 juin 2020, par user1hjgjhgjhggjhg

    Hello I want to create a duet video feature like tiktok. I am using FFmepg. I have tried this code

    


    ffmpeg -i movie_output.mp4 -i movie_output.mp4 -filter_complex  "nullsrc=size=360x480[base]; \ [0:v] setpts=PTS-STARTPTS, scale=360x480, crop=180:480:90:0[left]; \ [1:v] setpts=PTS-STARTPTS, scale=360x480, crop=180:480:90:0 [right]; \ [base][left] overlay=x=0:y=0[base1]; \ [base1][right] overlay=shortest=1:x=180:y=0" -c:v libx264 -y result.mp4


    


    It gives me this error

    


    No such filter: ' '
Error initializing complex filters.
Invalid argument


    


    Whole output

    


    ubuntu@ip-171-xx-xx-xxx: ffmpeg -i movie_output.mp4 -i movie_output.mp4 -filter_complex  "nullsrc=size=360x480[base]; \ [0:v] setpts=PTS-STARTPTS, scale=360x480, crop=180:480:90:0[left]; \ [1:v] setpts=PTS-STARTPTS, scale=360x480, crop=180:480:90:0 [right]; \ [base][left] overlay=x=0:y=0[base1]; \ [base1][right] overlay=shortest=1:x=180:y=0" -c:v libx264 -y result.mp4


ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'movie_output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    comment         : vid:v090440c0000brppph37mt2vmmsj1dig
  Duration: 00:00:08.04, start: 0.000000, bitrate: 1135 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 540x960 [SAR 1:1 DAR 9:16], 996 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'movie_output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    comment         : vid:v090440c0000brppph37mt2vmmsj1dig
  Duration: 00:00:08.04, start: 0.000000, bitrate: 1135 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 540x960 [SAR 1:1 DAR 9:16], 996 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[AVFilterGraph @ 0x560fd395e2e0] No such filter: ' '
Error initializing complex filters.
Invalid argument


    


    I have tried this as well

    


    ffmpeg -report -i "movie_output.mp4" -i "movie_output.mp4" -an \ -filter_complex \ "[0:v]trim=start=0:end=9,setpts=PTS-STARTPTS[firstclip]; \ [1:v]trim=start=1,setpts=PTS-STARTPTS[secondclip]; \ [0:v]trim=start=9:end=10,setpts=PTS-STARTPTS[fadeoutsrc]; \ [1:v]trim=start=0:end=1,setpts=PTS-STARTPTS[fadeinsrc]; \ [fadeinsrc]format=pix_fmts=yuva420p,fade=t=in:st=0:d=1:alpha=1[fadein]; \ [fadeoutsrc]format=pix_fmts=yuva420p,fade=t=out:st=0:d=1:alpha=1[fadeout]; \ [fadein]fifo[fadeinfifo]; \ [fadeout]fifo[fadeoutfifo]; \ [fadeoutfifo][fadeinfifo]overlay[crossfade]; \ [firstclip][crossfade][secondclip]concat=n=3" \ outputname.mp4
ffmpeg started on 2020-06-27 at 10:11:41
Report written to "ffmpeg-20200627-101141.log"
ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'movie_output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    comment         : vid:v090440c0000brppph37mt2vmmsj1dig
  Duration: 00:00:08.04, start: 0.000000, bitrate: 1135 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 540x960 [SAR 1:1 DAR 9:16], 996 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'movie_output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    comment         : vid:v090440c0000brppph37mt2vmmsj1dig
  Duration: 00:00:08.04, start: 0.000000, bitrate: 1135 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 540x960 [SAR 1:1 DAR 9:16], 996 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[NULL @ 0x562dea344220] Unable to find a suitable output format for ' -filter_complex'
 -filter_complex: Invalid argument


    


    This code gives this error

    


    Unable to find a suitable output format for ' -filter_complex'
     -filter_complex: Invalid argument


    


    Anyone can help ?

    


  • Concat filter : Error initializing output stream

    18 juin 2020, par Ittai Barkai

    This is a follow-up question to : Flutter (Dart) : Merge two videos and view the new output in the device’s gallery (photos)

    



    In essence, I am trying to record two videos, merge them and then view the new video in the gallery. I am currently having some issues with the flutter_ffmpeg package.

    



    I uploaded the my Flutter project onto GitHub here :

    



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

    



    Below is a snippet of my code used to execute ffmpeg :

    



    void _videoMerger() async {

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

    final FlutterFFmpeg _flutterFFmpeg = new FlutterFFmpeg();

        String commandToExecute = '-y -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"));

  }


    



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

    



    D/flutter-ffmpeg(29135): Running FFmpeg with arguments: [-y, -i, /storage/emulated/0/Android/data/com.example.video_merger_two/files/Pictures/1e8947f4-c9c2-4020-b78d-c40fb77ce0d16301015681843175998.mp4, -i, /storage/emulated/0/Android/data/com.example.video_merger_two/files/Pictures/3555b190-a9a6-450d-b6a7-7d1b8fc89ad38627500242651150494.mp4, -filter_complex, [0:0][1:0]concat=n=2:v=1:a=0[out], -map, [out], /data/user/0/com.example.video_merger_two/app_flutter/output.mp4].
    I/mobile-ffmpeg(29135): Loading mobile-ffmpeg.
    I/mobile-ffmpeg(29135): Loaded mobile-ffmpeg-https-x86-4.3.1-20200125.
    D/mobile-ffmpeg(29135): Callback thread started.
    I/mobile-ffmpeg(29135): ffmpeg version git-2020-01-25-fd11dd500
    I/mobile-ffmpeg(29135):  Copyright (c) 2000-2020 the FFmpeg developers
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):   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(29135):   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(29135):   libavutil      56. 38.100 / 56. 38.100
    I/mobile-ffmpeg(29135):   libavcodec     58. 65.102 / 58. 65.102
    I/mobile-ffmpeg(29135):   libavformat    58. 35.101 / 58. 35.101
    I/mobile-ffmpeg(29135):   libavdevice    58.  9.103 / 58.  9.103
    I/mobile-ffmpeg(29135):   libavfilter     7. 70.101 /  7. 70.101
    I/mobile-ffmpeg(29135):   libswscale      5.  6.100 /  5.  6.100
    I/mobile-ffmpeg(29135):   libswresample   3.  6.100 /  3.  6.100
    I/mobile-ffmpeg(29135): Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/com.example.video_merger_two/files/Pictures/1e8947f4-c9c2-4020-b78d-c40fb77ce0d16301015681843175998.mp4':
    I/mobile-ffmpeg(29135):   Metadata:
    I/mobile-ffmpeg(29135):     major_brand     :
    I/mobile-ffmpeg(29135): mp42
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     minor_version   :
    I/mobile-ffmpeg(29135): 0
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     compatible_brands:
    I/mobile-ffmpeg(29135): isommp42
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     creation_time   :
    I/mobile-ffmpeg(29135): 2020-06-17T18:26:00.000000Z
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     com.android.version:
    I/mobile-ffmpeg(29135): 10
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):   Duration:
    I/mobile-ffmpeg(29135): 27:34:19.38
    I/mobile-ffmpeg(29135): , start:
    I/mobile-ffmpeg(29135): 0.000000
    I/mobile-ffmpeg(29135): , bitrate:
    I/mobile-ffmpeg(29135): 0 kb/s
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     Stream #0:0
    I/mobile-ffmpeg(29135): (eng)
    I/mobile-ffmpeg(29135): : Video: h264 (avc1 / 0x31637661), yuv420p(tv, GBR), 1280x720, 3554 kb/s
    I/mobile-ffmpeg(29135): , SAR 1:1 DAR 16:9
    I/mobile-ffmpeg(29135): ,
    I/mobile-ffmpeg(29135): 29.01 fps,
    I/mobile-ffmpeg(29135): 29 tbr,
    I/mobile-ffmpeg(29135): 90k tbn,
    I/mobile-ffmpeg(29135): 180k tbc    
    I/mobile-ffmpeg(29135):  (default)
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     Metadata:
    I/mobile-ffmpeg(29135):       rotate          :
    I/mobile-ffmpeg(29135): 90
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):       creation_time   :
    I/mobile-ffmpeg(29135): 2020-06-17T18:26:00.000000Z
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):       handler_name    :
    I/mobile-ffmpeg(29135): VideoHandle
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     Side data:
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135): displaymatrix: rotation of -90.00 degrees
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     Stream #0:1
    I/mobile-ffmpeg(29135): (eng)
    I/mobile-ffmpeg(29135): : Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono, flt, 12 kb/s
    I/mobile-ffmpeg(29135):  (default)
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     Metadata:
    I/mobile-ffmpeg(29135):       creation_time   :
    I/mobile-ffmpeg(29135): 2020-06-17T18:26:00.000000Z
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):       handler_name    :
    I/mobile-ffmpeg(29135): SoundHandle
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135): Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/com.example.video_merger_two/files/Pictures/3555b190-a9a6-450d-b6a7-7d1b8fc89ad38627500242651150494.mp4':
    I/mobile-ffmpeg(29135):   Metadata:
    I/mobile-ffmpeg(29135):     major_brand     :
    I/mobile-ffmpeg(29135): mp42
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     minor_version   :
    I/mobile-ffmpeg(29135): 0
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     compatible_brands:
    I/mobile-ffmpeg(29135): isommp42
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     creation_time   :
    I/mobile-ffmpeg(29135): 2020-06-17T18:26:09.000000Z
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     com.android.version:
    I/mobile-ffmpeg(29135): 10
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):   Duration:
    I/mobile-ffmpeg(29135): 27:34:19.62
    I/mobile-ffmpeg(29135): , start:
    I/mobile-ffmpeg(29135): 0.000000
    I/mobile-ffmpeg(29135): , bitrate:
    I/mobile-ffmpeg(29135): 0 kb/s
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     Stream #1:0
    I/mobile-ffmpeg(29135): (eng)
    I/mobile-ffmpeg(29135): : Video: h264 (avc1 / 0x31637661), yuv420p(tv, GBR), 1280x720, 3765 kb/s
    I/mobile-ffmpeg(29135): , SAR 1:1 DAR 16:9
    I/mobile-ffmpeg(29135): ,
    I/mobile-ffmpeg(29135): 28.80 fps,
    I/mobile-ffmpeg(29135): 29.08 tbr,
    I/mobile-ffmpeg(29135): 90k tbn,
    I/mobile-ffmpeg(29135): 180k tbc
    I/mobile-ffmpeg(29135):  (default)
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     Metadata:
    I/mobile-ffmpeg(29135):       rotate          :
    I/mobile-ffmpeg(29135): 90
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):       creation_time   :
    I/mobile-ffmpeg(29135): 2020-06-17T18:26:09.000000Z
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):       handler_name    :
    I/mobile-ffmpeg(29135): VideoHandle
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     Side data:
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135): displaymatrix: rotation of -90.00 degrees
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     Stream #1:1
    I/mobile-ffmpeg(29135): (eng)
    I/mobile-ffmpeg(29135): : Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono, flt, 12 kb/s
    I/mobile-ffmpeg(29135):  (default)
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):     Metadata:
    I/mobile-ffmpeg(29135):       creation_time   :
    I/mobile-ffmpeg(29135): 2020-06-17T18:26:09.000000Z
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):       handler_name    :
    I/mobile-ffmpeg(29135): SoundHandle
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135): Stream mapping:
    I/mobile-ffmpeg(29135):   Stream #0:0 (h264) -> concat:in0:v0
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):   Stream #1:0 (h264) -> concat:in1:v0
    I/mobile-ffmpeg(29135):
    I/mobile-ffmpeg(29135):   concat
    I/mobile-ffmpeg(29135):  -> Stream #0:0 (mpeg4)
    I/mobile-ffmpeg(29135): Press [q] to stop, [?] for help
    W/mobile-ffmpeg(29135): [graph 0 input from stream 0:0 @ 0xed087710] sws_param option is deprecated and ignored
    W/mobile-ffmpeg(29135): [graph 0 input from stream 1:0 @ 0xed086830] sws_param option is deprecated and ignored
    W/mobile-ffmpeg(29135): [mp4 @ 0xeccd8790] Frame rate very high for a muxer not efficiently supporting it.
    W/mobile-ffmpeg(29135): Please consider specifying a lower framerate, a different muxer or -vsync 2
    E/mobile-ffmpeg(29135): [mpeg4 @ 0xe68049d0] timebase 1/1000000 not supported by MPEG 4 standard, the maximum admitted value for the timebase denominator is 65535
    E/mobile-ffmpeg(29135): Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
    I/mobile-ffmpeg(29135): Conversion failed!
    D/flutter-ffmpeg(29135): FFmpeg exited with rc: 1
    I/flutter (29135): FFmpeg process exited with rc 1


    


  • 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 :

    



    enter image description here

    



    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


    


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