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• Amplification of recorded audio in flutter app using FFMPEG not working correctly

  20 mai, par Noman khanbhai

  In my app I need to record audio and send it to server, server then sends the file to a hardware using mqtt and then file gets played on the hardware. I am using flutter to build app and using record 5.0.5 package for audio recording and for amplification ffmpeg_kit_flutter 6.0.3 package to do the amplification.

  


  The issue is it doesnt seems like there is much change in amplitude, I used different values for amplification factor but audio remains same.

  


  Here is the code for amplification

  


  Future<string>? amplifyAudio(&#xA;      String inputPath, String outputPath) async {&#xA;&#xA;    // Build FFmpeg command to amplify audio&#xA;    outputPath = await modifyOutputPath(inputPath)!;&#xA;    String audioFilter = &#x27;volume=${amplificationFactor}dB&#x27;; &#xA;    //-c:a aac&#xA;    String command = &#x27;-i $inputPath -af $audioFilter $outputPath&#x27;;&#xA;&#xA;    // Execute FFmpeg command&#xA;    await FFmpegKit.executeAsync(command).then((session) async {&#xA;      debugPrint("After executeAsync session ${session.toString()}");&#xA;      debugPrint(&#xA;          "After executeAsync returncode ${await session.getReturnCode()}");&#xA;      debugPrint("After executeAsync command ${session.getCommand()}");&#xA;      log("After executeAsync alllogs ${await session.getAllLogs()}");&#xA;      log("After executeAsync alllogstring ${await session.getAllLogsAsString()}");&#xA;      log("After executeAsync failStackTrace ${await session.getFailStackTrace()}");&#xA;    }).onError((error, stackTrace) {&#xA;      debugPrint("After executeAsync error ${error.toString()}");&#xA;    });&#xA;&#xA;    return outputPath;&#xA;  }&#xA;&#xA;</string>

  


  This are the logs when above method gets executed.

  


  FFMpeg command -> `-i /data/user/0/com.orgname.flutter.appname/app_flutter/1716209206469.aac -af volume=10.0dB /storage/emulated/0/Download/1716209213238_amplified.aac`

> Logs
> After executeAsync alllogstring ffmpeg version n6.0 Copyright (c) 2000-2023 the FFmpeg developers
> built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
> configuration: --cross-prefix=aarch64-linux-android- --sysroot=/Users/sue/Library/Android/sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/darwin-x86_64/sysroot --prefix=/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/ffmpeg --pkg-config=/opt/homebrew/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --ar=aarch64-linux-android-ar --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --disable-static --enable-shared --enable-pthreads --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --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-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-gmp --enable-gnutls --enable-iconv --disable-sdl2 --disable-openssl --enable-zlib --enable-mediacodec
> libavutil      58.  2.100 / 58.  2.100
> libavcodec     60.  3.100 / 60.  3.100
> libavformat    60.  3.100 / 60.  3.100
> libavdevice    60.  1.100 / 60.  1.100
> libavfilter     9.  3.100 /  9.  3.100
> libswscale      7.  1.100 /  7.  1.100
> libswresample   4. 10.100 /  4. 10.100
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/com.orgname.flutter.appname/app_flutter/1716209206469.aac':
> Metadata:
> major_brand     : mp42
> minor_version   : 0
> compatible_brands: isommp42
> creation_time   : 2024-05-20T12:46:52.000000Z
> com.android.version: 12
> Duration: 00:00:04.76, start: 0.000000, bitrate: 131 kb/s
> Stream #0:0[0x1](eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
> Metadata:
> creation_time   : 2024-05-20T12:46:52.000000Z
> handler_name    : SoundHandle
> vendor_id       : [0][0][0][0]
> Stream mapping:
> Stream #0:0 -> #0:0 (aac (native) -> aac (native))
> Press [q] to stop, [?] for help


  


  Note - I am also playing the audio after recording and before amplification in app, and also saving in download. to make sure audio file is correct.

  


  Amplified file also gets saved but there is almost no difference.

  


  I have also searched/googled/ and also done chatgpt to resolve issue. but nothing worked.

  


• How do I configure codec parameters for a RTSP stream ?

  16 mai, par Kermit

  I am trying to stream a network camera source into /dev/video0. However, all attempts keep telling me I have set incorrect codec parameters. Any suggestions ?

  


  # works
ffplay rtsp://admin:password@172.16.0.184:554/live


  


  Then trying any of these to feed into /dev/video0 (valid from list of ls /dev/video*) :

  


  ffmpeg -rtsp_transport tcp -i "rtsp://admin:password@172.16.0.184:554/live" -c:v rawvideo -pix_fmt yuv420p -f v4l2 /dev/video0


  


  Results in

  


  ffmpeg version 5.1.4-0+rpt3+deb12u1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12 (Debian 12.2.0-14)
  configuration: --prefix=/usr --extra-version=0+rpt3+deb12u1 --toolchain=hardened --incdir=/usr/include/aarch64-linux-gnu --enable-gpl --disable-stripping --disable-mmal --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sand --enable-sdl2 --disable-sndio --enable-libjxl --enable-neon --enable-v4l2-request --enable-libudev --enable-epoxy --libdir=/usr/lib/aarch64-linux-gnu --arch=arm64 --enable-pocketsphinx --enable-librsvg --enable-libdc1394 --enable-libdrm --enable-vout-drm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-librav1e --enable-shared
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, rtsp, from 'rtsp://admin:password@172.16.0.184:554/live':
  Metadata:
    title           : Media Server
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 3840x2160, 30 fps, 100 tbr, 90k tbn
  Stream #0:1: Audio: aac (LC), 32000 Hz, mono, fltp
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> rawvideo (native))
Press [q] to stop, [?] for help
[video4linux2,v4l2 @ 0x55562d9faa70] ioctl(VIDIOC_G_FMT): Invalid argument
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 -- 
Conversion failed!


  


• File conversion to mp3 returning failure everytime using flutter package ffmpeg_kit_flutter

  10 mai, par Sanath balthar

  I am trying to convert a .wav audio file generated from a flutter's text to speech package - "flutter_tts" to mp3 file but it is failing everytime.
I have written the below code for file conversion. I have imported the package ffmpeg_kit_flutter. It doesnt even show why the conversion is failing.
I have looked up in stackoverflow and other sites but could not find any relevant solutions. I am using vscode as editor. I have attached flutter doctor output below as well. Could anyone please guide me ? Let me know if you need more information.

  


  List<string> command = [&#xA;              &#x27;-i&#x27;, &#x27;$filePath/998tts.wav&#x27;,&#xA;              &#x27;-c:a&#x27;, &#x27;mp3&#x27;,&#xA;              &#x27;$filePath/998.mp3&#x27;&#xA;            ];&#xA;&#xA; await FFmpegKitConfig.enableLogs();&#xA;            FFmpegKitConfig.enableLogCallback((log) =>print(&#x27;FFmpeg log: $log&#x27;));        &#xA;          FFmpegSession result = await FFmpegKit.executeWithArguments(command);&#xA;          dynamic resultcode = await result.getReturnCode();&#xA;          dynamic resultlogs = await result.getLogsAsString();&#xA;          // FFmpegKitConfig.setLogLevel(logLevel)&#xA;          if(ReturnCode.isSuccess(resultcode)){&#xA;          print("file saved after conversion at $filePath/998.mp3 and result : Success and logs : $resultlogs");&#xA;          }&#xA;          else{&#xA;            print("Result : failure and logs : $resultlogs");&#xA;          }&#xA;&#xA;Flutter doctor output:&#xA;[√] Flutter (Channel stable, 3.19.6, on Microsoft Windows [Version 10.0.22631.3296], locale en-IN)&#xA;[√] Windows Version (Installed version of Windows is version 10 or higher)&#xA;[√] Android toolchain - develop for Android devices (Android SDK version 34.0.0)&#xA;[√] Chrome - develop for the web&#xA;[!] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.9.5)&#xA;X Visual Studio is missing necessary components. Please re-run the Visual Studio installer for the "Desktop development with C&#x2B;&#x2B;"&#xA;workload, and include these components:&#xA;MSVC v142 - VS 2019 C&#x2B;&#x2B; x64/x86 build tools&#xA;- If there are multiple build tool versions available, install the latest&#xA;C&#x2B;&#x2B; CMake tools for Windows&#xA;Windows 10 SDK&#xA;[√] Android Studio (version 2023.2)&#xA;[√] VS Code (version 1.89.0)&#xA;[√] Connected device (3 available)&#xA;[√] Network resources&#xA;&#xA;! Doctor found issues in 1 category.&#xA;&#xA;</string>

  


  Edit : Attaching error logs :

  


  I/flutter (25865): Loading ffmpeg-kit-flutter.
D/ffmpeg-kit-flutter(25865): FFmpegKitFlutterPlugin com.arthenica.ffmpegkit.flutter.FFmpegKitFlutterPlugin@a5d9788 started listening to events on io.flutter.plugin.common.EventChannel$IncomingStreamRequestHandler$EventSinkImplementation@4cfb5f2.
I/flutter (25865): Loaded ffmpeg-kit-flutter-android-audio-arm64-v8a-6.0.3.
I/flutter (25865): Result : failure and logs : ffmpeg version n6.0 Copyright (c) 2000-2023 the FFmpeg developers
I/flutter (25865):   built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)

I/flutter (25865):   configuration: --cross-prefix=aarch64-linux-android- --sysroot=/Users/sue/Library/Android/sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/darwin-x86_64/sysroot --prefix=/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/ffmpeg --pkg-config=/opt/homebrew/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --ar=aarch64-linux-android-ar --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile