Recherche avancée

Sur d’autres sites (6857)

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

  20 mai 2024, 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.

  


• Thumbnail generation using golang+ffmpeg

  23 avril 2024, par godvlpr

  I try to generate thumbnail from video mp4 using Golang+ffmpeg.

  


  Let me provide some steps :

  


  

  1. Tried to generate using terminal ffmpeg -i test.mp4 -ss 00:00:00 -vframes 1 thumbnail.jpg - all works successfully

  


  2. Tried to generate from golang and put result into stdout   cmd := exec.Command("ffmpeg", "-i", "test.mp4", "-ss", "00:00:00", "-vframes", "1", "-f", "image2pipe", "-") - all works successfully

  


  3. Trying to open video using os.ReadFile and bytes.NewReader and after that -   cmd := exec.Command("ffmpeg", "-i", "pipe:", "-ss", "00:00:00", "-vframes", "1", "-f", "image2pipe", "-") And in this step I have an error.
Below provided all code and na error

  


  


      r, err := os.ReadFile("test.mp4")
    if err != nil {
        log.Fatalf("Failed to read video file: %v", err)
    }
    
    videoBuffer := bytes.NewReader(r)

    cmd := exec.Command("ffmpeg", "-i", "pipe:", "-ss", "00:00:00", "-vframes", "1", "-f", "image2pipe", "-")

    cmd.Stdin = videoBuffer

    // Capture output as bytes
    var out bytes.Buffer
    cmd.Stdout = &out

    var stderr bytes.Buffer
    cmd.Stderr = &stderr

    // Run the command
    err = cmd.Run()
    if err != nil {
        log.Fatalf("ffmpeg command failed: %v, stderr: %s", err, stderr.String())
    }

    // Convert bytes to image.Image
    img, _, err := image.Decode(&out)
    if err != nil {
        log.Fatalf("Failed to decode thumbnail: %v", err)
    }


  


  Error

  


  2024/04/23 13:25:51 ffmpeg command failed: exit status 183, stderr: ffmpeg version 7.0 Copyright (c) 2000-2024 the FFmpeg developers
  built with Apple clang version 15.0.0 (clang-1500.3.9.4)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/7.0 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenvino --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
  libavutil      59.  8.100 / 59.  8.100
  libavcodec     61.  3.100 / 61.  3.100
  libavformat    61.  1.100 / 61.  1.100
  libavdevice    61.  1.100 / 61.  1.100
  libavfilter    10.  1.100 / 10.  1.100
  libswscale      8.  1.100 /  8.  1.100
  libswresample   5.  1.100 /  5.  1.100
  libpostproc    58.  1.100 / 58.  1.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x136504080] stream 0, offset 0x30: partial file
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x136504080] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 1920x1080, 3496 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.26.100
  Duration: 00:00:02.01, start: 0.000000, bitrate: N/A
  Stream #0:0[0x1](und): Video: h264 (avc1 / 0x31637661), none, 1920x1080, 3496 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
      Metadata:
        handler_name    : VideoHandler
        vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 96 kb/s (default)
      Metadata:
        handler_name    : SoundHandler
        vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x136504080] stream 0, offset 0x30: partial file
[in#0/mov,mp4,m4a,3gp,3g2,mj2 @ 0x600001134000] Error during demuxing: Invalid data found when processing input
Cannot determine format of input 0:0 after EOF
[vf#0:0 @ 0x600001f2c000] Task finished with error code: -1094995529 (Invalid data found when processing input)
[vf#0:0 @ 0x600001f2c000] Terminating thread with return code -1094995529 (Invalid data found when processing input)
[vost#0:0/mjpeg @ 0x104a04650] Could not open encoder before EOF
[vost#0:0/mjpeg @ 0x104a04650] Task finished with error code: -22 (Invalid argument)
[vost#0:0/mjpeg @ 0x104a04650] Terminating thread with return code -22 (Invalid argument)
[out#0/image2pipe @ 0x60000182c000] Nothing was written into output file, because at least one of its streams received no packets.
frame=    0 fps=0.0 q=0.0 Lsize=       0KiB time=N/A bitrate=N/A speed=N/A    
Conversion failed!


  


  Also tried to do something like this cmd := exec.Command("ffmpeg", "-analyzeduration", "10000M", "-probesize", "10000M", "-i", "pipe:", "-ss", "00:00:00", "-vframes", "1", "-f", "image2pipe", "-") - and had the same error (almost the same).

  


  How to fix code or ffmpeg command - to bring this code workable ?

  


• Nginx - RTMP module - VLC wont start

  15 janvier, par Diana Sari

  Why my vlc only show background colour ?
did i miss something important ?

  


  Im running Nginx with RTMP module on
Linux DESKTOP-RJHVE83 5.15.167.4-microsoft-standard-WSL2 #1 SMP x86_64 GNU/Linux
Kali release : 2024.4 (kali-rolling) WSL on Windows 10 Pro

  


  Screenshot of my VLC

  


  /etc/nginx/nginx.conf
i add this from the default :

  


  rtmp {
    server {
        listen 1935;
        chunk_size 4096;
  allow publish 127.0.0.1;
  deny publish all;

        application live {
            live on;
            record off;
        push rtmp://127.0.0.1/live/stream;
        }
    }
}


  


  Stream my mp4 file using ffmpeg :

  


  


  Kali$> ffmpeg -re -i file.mp4 -c:v libx264 -c:a aac -flvflags no_duration_filesize -f flv rtmp ://localhost:1935/live/

  


  


  VLC on the same machine on WIndows 10 Pro
Open Network Protocol : rtmp ://192.168.1.1:1935/live/

  


  The Vlc Show only Background colour (attach)

  


  -Access.log
172.27.96.1 [14/Jan/2025:14:28:02 +0700] PLAY "live" "" "" - 556 1612142 "" "LNX 9,0,124,2" (25s)
127.0.0.1 [14/Jan/2025:14:28:34 +0700] PUBLISH "live" "" "" - 4573293 529 "" "FMLE/3.0 (compatible ; Lavf61.7." (1m 3s)
172.27.96.1 [14/Jan/2025:14:29:47 +0700] PLAY "live" "" "" - 365 1578527 "" "LNX 9,0,124,2" (1m 43s)

  


  -Error.log
Blank

  


  i tried this on :
Ubuntu Focal 20.04.6 (WSL)
Ubuntu Noble24.04.1 LTS (WSL)
id read 2 tutorials
https://www.hostinger.com/tutorials/how-to-set-up-a-streaming-server
https://www.digitalocean.com/community/tutorials/how-to-set-up-a-video-streaming-server-using-nginx-rtmp-on-ubuntu-20-04