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  • How do I get video frame buffer stream from a connected GoPro camera ?

    29 décembre 2024, par cleanrun

    I'm creating an app that can connect to a GoPro camera and I want to get the frame buffer stream from the connected GoPro camera and use it on my iOS app (by converting the buffer data into CMSampleBuffer). I'm currently trying to use the FFmpeg library but so far it doesn't work. Here's the logic I've implemented (I'm using ChatGPT to generate the code) :

    


    import Foundation
import CoreMedia
import AVFoundation
import ffmpegkit


final class FFmpegBufferProcessor: AnyBufferProcessor {
    weak var delegate: BufferProcessorDelegate?
    
    private var pipePath: String = NSTemporaryDirectory() + "ffmpeg_pipe"
    private var isProcessing: Bool = false
    private var videoWidth = 1920
    private var videoHeight = 1080
    private let pixelFormat = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange
    
    init() {
        setupPipe()
    }
    
    deinit {
        cleanupPipe()
    }
    
    private func setupPipe() {
        do {
            if FileManager.default.fileExists(atPath: pipePath) {
                try FileManager.default.removeItem(atPath: pipePath)
            }
            
            let result = mkfifo(pipePath.cString(using: .utf8), 0o644)
            if result != 0 {
                print("\(#function); Pipe creation failed.")
                return
            }
        } catch {
            print("\(#function); Setup pipe error: \(error.localizedDescription)")
        }
    }
    
    private func cleanupPipe() {
        do {
            try FileManager.default.removeItem(atPath: pipePath)
        } catch {
            print("\(#function); Cleanup pipe error: \(error.localizedDescription)")
        }
    }
    
    func startProcessingStream(from udpURL: String) {
        guard !isProcessing else {
            print("\(#function); Already processing stream.")
            return
        }
        
        isProcessing = true
        let command = """
        -i \(udpURL) -f rawvideo -pix_fmt nv12 \(pipePath)
        """
        
        FFmpegKit.executeAsync(command) { [weak self] session in
            let returnCode = session?.getReturnCode()
            if ReturnCode.isSuccess(returnCode) {
                print("\(#function); FFmpeg session completed.")
            } else {
                print("\(#function); FFmpeg session error: \(String(describing: session?.getFailStackTrace())).")
            }
            
            self?.isProcessing = false
        }
        
        readFromPipe()
    }
    
    func stopProcessingStream() {
        isProcessing = false
        FFmpegKit.cancel()
    }
}

// MARK: - Private methods

private extension FFmpegBufferProcessor {
    func readFromPipe() {
        DispatchQueue.global(qos: .background).async { [unowned self] in
            guard let fileHandle = FileHandle(forReadingAtPath: self.pipePath) else {
                print("\(#function); Fail to read file handle from pipe path.")
                return
            }
            
            autoreleasepool {
                while self.isProcessing {
                    let frameSize = self.videoWidth * self.videoHeight * 3 / 2
                    let rawData = fileHandle.readData(ofLength: frameSize)
                    
                    if rawData.isEmpty {
                        print("\(#function); Pipe closed / no more data to read.")
                        break
                    }
                    
                    self.handleRawFrameData(rawData)
                }
                
                fileHandle.closeFile()
            }
        }
    }
    
    func handleRawFrameData(_ data: Data) {
        let width = 1920
        let height = 1080
        
        // Creating the Pixel Buffer (if possible)
        guard let pixelBuffer = createPixelBuffer(from: data, width: width, height: height) else {
            print("\(#function); Failed to create pixel buffer")
            return
        }
        
        var timing = CMSampleTimingInfo(duration: CMTime(value: 1, timescale: 30), presentationTimeStamp: .zero, decodeTimeStamp: .invalid)
        // Creating the Sample Buffer (if possible)
        guard let sampleBuffer = createSampleBuffer(from: pixelBuffer, timing: &timing) else {
            print("\(#function); Failed to create sample buffer")
            return
        }
        
        delegate?.bufferProcessor(self, didOutput: sampleBuffer)
    }
}


    


    Here's the logs I'm getting from FFMpeg :

    


    Debug log

    


    Also a quick note, I'm using AVSampleBufferDisplayLayer to enqueue and show the buffers, but obviously it doesn't show up.

    


    What should I do to fix this ? Or maybe is there any other way to get the frame buffers from a GoPro camera and show it in iOS ? Any help would be appreciated. Thank you.

    


  • Flutter FFMPEG : The BackgroundIsolateBinaryMessenger.instance value is invalid until BackgroundIsolateBinaryMessenger.ensureInitialized is executed

    25 juin 2023, par Danny

    Hey guys I have a function that uses ffmpeg to convert images to gifs. I am using the simple compute function provided by flutter, but I am getting this error.

    


    


    I/flutter (12889) : Loading ffmpeg-kit-flutter. E/flutter (12889) :
[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled
Exception : Bad state : The BackgroundIsolateBinaryMessenger.instance
value is invalid until
BackgroundIsolateBinaryMessenger.ensureInitialized is executed.
E/flutter (12889) : #0 BackgroundIsolateBinaryMessenger.instance

    


    


    Logs :

    


    


    I/flutter (12889) : Loading ffmpeg-kit-flutter. E/flutter (12889) :
[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled
Exception : Bad state : The BackgroundIsolateBinaryMessenger.instance
value is invalid until
BackgroundIsolateBinaryMessenger.ensureInitialized is executed.
E/flutter (12889) : #0 BackgroundIsolateBinaryMessenger.instance
(package:flutter/src/services/_background_isolate_binary_messenger_io.dart:27:7)
E/flutter (12889) : #1 _findBinaryMessenger
(package:flutter/src/services/platform_channel.dart:135:42) E/flutter
(12889) : #2 EventChannel.binaryMessenger
(package:flutter/src/services/platform_channel.dart:619:27) E/flutter
(12889) : #3 EventChannel.receiveBroadcastStream. (package:flutter/src/services/platform_channel.dart:639:7)
E/flutter (12889) : #4 _runGuarded
(dart:async/stream_controller.dart:815:24) E/flutter (12889) : #5
    
_BroadcastStreamController._subscribe (dart:async/broadcast_stream_controller.dart:207:7) E/flutter (12889) :
#6 _ControllerStream._createSubscription (dart:async/stream_controller.dart:828:19) E/flutter (12889) : #7
    
_StreamImpl.listen (dart:async/stream_impl.dart:471:9) E/flutter (12889) : #8 FFmpegKitInitializer._initialize
(package:ffmpeg_kit_flutter_min_gpl/src/ffmpeg_kit_flutter_initializer.dart:311:44)
E/flutter (12889) : #9 FFmpegKitInitializer.initialize
(package:ffmpeg_kit_flutter_min_gpl/src/ffmpeg_kit_flutter_initializer.dart:54:23)
E/flutter (12889) : #10 FFmpegKitConfig.init
(package:ffmpeg_kit_flutter_min_gpl/ffmpeg_kit_config.dart:50:32)
E/flutter (12889) : #11 AbstractSession.createFFmpegSession
(package:ffmpeg_kit_flutter_min_gpl/abstract_session.dart:69:29)
E/flutter (12889) : #12 FFmpegSession.create
(package:ffmpeg_kit_flutter_min_gpl/ffmpeg_session.dart:40:43)
E/flutter (12889) : #13 FFmpegKit.executeWithArguments
(package:ffmpeg_kit_flutter_min_gpl/ffmpeg_kit.dart:44:29) E/flutter
(12889) : #14 FFmpegKit.execute
(package:ffmpeg_kit_flutter_min_gpl/ffmpeg_kit.dart:38:17) E/flutter
(12889) : #15 _shareMoments
(package:carefour/presentation/maker/create_function.dart:217:19)
E/flutter (12889) : #16 compute.
(package:flutter/src/foundation/_isolates_io.dart:19:20) E/flutter
(12889) : #17 _RemoteRunner._run (dart:isolate:1021:47) E/flutter
(12889) : #18 _RemoteRunner._remoteExecute (dart:isolate:1015:12)
E/flutter (12889) : #19 _delayEntrypointInvocation. (dart:isolate-patch/isolate_patch.dart:299:17) E/flutter
(12889) : #20 _RawReceivePort._handleMessage
(dart:isolate-patch/isolate_patch.dart:189:12)

    


    


    This is the code :

    


    Future<bool> shareMoments(ComputeMomentModel data) async {&#xA;  File? imgFile;&#xA;  File? paletteFile;&#xA;  var uuid = const Uuid();&#xA;  String newUuid = uuid.v4();&#xA;  String finalImagePath = "momentGif-$newUuid.gif";&#xA;  String paletteFileName= "momentPalette-$newUuid.png";&#xA;  File? finalImage;&#xA;  finalImage = null;&#xA;&#xA;  await FFmpegKit.execute(&#x27;-i ${data.directoryPath}/image%d.png -vf palettegen ${data.directoryPath}/$paletteFileName&#x27;).then((session) async {&#xA;    final returnCode = await session.getReturnCode();&#xA;&#xA;    if (ReturnCode.isSuccess(returnCode)) {&#xA;      paletteFile = File("${data.directoryPath}/$paletteFileName");&#xA;&#xA;      await FFmpegKit.execute(&#x27;-f image2 -y -r 8 -i ${data.directoryPath}/image%d.png -i ${paletteFile?.path} -filter_complex fps=8,scale=720:-1:flags=lanczos,split[s0][s1];[s0]palettegen=max_colors=32[p];[s1][p]paletteuse=dither=bayer ${data.directoryPath}/$finalImagePath&#x27;).then((session) async {&#xA;        final returnCode = await session.getReturnCode();&#xA;        if (ReturnCode.isSuccess(returnCode)) {&#xA;          finalImage = File("${data.directoryPath}/$finalImagePath");&#xA;        }&#xA;      });&#xA;&#xA;    } else {&#xA;      debugPrint("Failed");&#xA;    }&#xA;  });&#xA;&#xA;  // Below block to clear the cache - else ffmpeg keeps on creating the first one&#xA;  int i = 0;&#xA;  for (i = 0; i&lt;24; i&#x2B;&#x2B;) {&#xA;    imgFile = File(&#x27;${data.directoryPath}/image$i.png&#x27;);&#xA;    imgFile.delete(recursive: true);&#xA;  }&#xA;&#xA;  // —> Calling Backend API&#xA;&#xA;  return true;&#xA;&#xA;}&#xA;</bool>

    &#xA;

    compute function

    &#xA;

    Future<bool> computeShareMoments({required String directoryPath}) async {&#xA;  ComputeCreateMomentModel data = ComputeMomentModel(null, directoryPath);&#xA;  return await compute(shareMoments, data);&#xA;&#xA;}&#xA;</bool>

    &#xA;

    Can anyone help with a solution ? I am stuck for a while now. Thanks in advance.

    &#xA;

  • how to build ffmpeg with burn text on hls output while maintaining the aspect ratio

    26 février 2016, par Aameer

    My objective is to burn a text(watermark) at a particular time range on the outputed hls video, I also have to change just the height and maintain the aspect ratio which I am able to do but the burning in text part is not working. First the ffmpeg I used is for 14.04 ubuntu, details are here. I don’t think this build supports subtitle (docs) filter which I could have used for my purpose as described here. when i enter ffmpeg into the terminal this is the output

    (ffmpeg)aameer@falcon:~/Documents/projects/ffmpeg$ ffmpeg 
    
ffmpeg version N-78590-g5590ab4 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.1)
    
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab
    
  libavutil      55. 18.100 / 55. 18.100
    
  libavcodec     57. 24.103 / 57. 24.103
    
  libavformat    57. 25.100 / 57. 25.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 32.100 /  6. 32.100
    
  libavresample   3.  0.  0 /  3.  0.  0
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
Hyper fast Audio and Video encoder
    
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
    

    
Use -h to get full help or, even better, run 'man ffmpeg'

    I tried

    (ffmpeg)aameer@falcon:~/Documents/projects/ffmpeg$ ffmpeg -threads 4 -i "input_sintel_trailer_720p.mp4" -profile:v baseline -level 4.0 -vf scale="trunc(360*a/2)*2:360, subtitles='subtitles.srt'"  -start_number 0 -hls_time 10 -hls_list_size 0 -f hls videos/4444/index_4444_360_.m3u8

    and got an error

    [Parsed_subtitles_1 @ 0x2f1b7e0] Shaper: FriBidi 0.19.6 (SIMPLE) HarfBuzz-ng 0.9.27 (COMPLEX)
    
[Parsed_subtitles_1 @ 0x2f1b7e0] Unable to open subtitles.srt
    
[AVFilterGraph @ 0x2f1ac00] Error initializing filter 'subtitles' with args 'subtitles.srt'
    
Error opening filters!

    then I tried this

    (ffmpeg)aameer@falcon:~/Documents/projects/ffmpeg$ ffmpeg -threads 4 -i "input_sintel_trailer_720p.mp4" -profile:v baseline -level 4.0 -vf "scale='trunc(360*a/2)*2:360', drawtext:drawtext"  -start_number 0 -hls_time 10 -hls_list_size 0 -f hls videos/4444/index_4444_360_.m3u8

    based on an answer here and got this error

    [AVFilterGraph @ 0x2695c20] No such filter: 'drawtext:drawtext'
    
Error opening filters!

    I tried a static build too which i got from here but still couldn’t make it work. with this static build i tried :

    ffmpeg version N-63893-gc69defd Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Jul 16 2014 05:38:01 with gcc 4.6 (Debian 4.6.3-1)
    
  configuration: --prefix=/root/ffmpeg-static/64bit --extra-cflags='-I/root/ffmpeg-static/64bit/include -static' --extra-ldflags='-L/root/ffmpeg-static/64bit/lib -static' --extra-libs='-lxml2 -lexpat -lfreetype' --enable-static --disable-shared --disable-ffserver --disable-doc --enable-bzlib --enable-zlib --enable-postproc --enable-runtime-cpudetect --enable-libx264 --enable-gpl --enable-libtheora --enable-libvorbis --enable-libmp3lame --enable-gray --enable-libass --enable-libfreetype --enable-libopenjpeg --enable-libspeex --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-version3 --enable-libvpx
    
  libavutil      52. 89.100 / 52. 89.100
    
  libavcodec     55. 66.101 / 55. 66.101
    
  libavformat    55. 43.100 / 55. 43.100
    
  libavdevice    55. 13.101 / 55. 13.101
    
  libavfilter     4.  8.100 /  4.  8.100
    
  libswscale      2.  6.100 /  2.  6.100
    
  libswresample   0. 19.100 /  0. 19.100
    
  libpostproc    52.  3.100 / 52.  3.100
    
Hyper fast Audio and Video encoder
    
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
    

    
Use -h to get full help or, even better, run 'man ffmpeg'
    

    
(ffmpeg)aameer@falcon:~/Documents/projects/ffmpeg$ ./ffmpeg -threads 4 -i "input_sintel_trailer_720p.mp4" -profile:v baseline -level 4.0 -vf scale="trunc(360*a/2)*2:360, subtitles='subtitle.srt'"  -start_number 0 -hls_time 10 -hls_list_size 0 -f hls videos/4444/index_4444_360_.m3u8

    but got an error

    Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory

    Any help in this regard would be appreciated. I don’t have much experience with compiling , otherwise would have done with support for libass as mentioned in the documentation here

    console output after trying the first potential answer :

    (ffmpeg)aameer@falcon:~/Documents/projects/ffmpeg$ ls
    
bbb_sunflower_1080p_30fps_normal.mp4  ffmpeg_log_multiprocess.txt  ffmpeg.static.64bit.latest  input_sintel_trailer_720p.mp4  watermark.png
    
encoding_script.sh                    ffmpeg_log_simple.txt        ffprobe                     subtitle.srt
    
ffmpeg                                ffmpeg_log.txt               fontconfig                  videos
    
(ffmpeg)aameer@falcon:~/Documents/projects/ffmpeg$ ffmpeg -threads 4 -i input_sintel_trailer_720p.mp4 -profile:v baseline -level 4.0 -vf "scale=-2:360,subtitles='subtitle.srt'" -start_number 0 -hls_time 10 -hls_list_size 0 -f hls videos/4444/index_4444_360_.m3u8
    
ffmpeg version N-78590-g5590ab4 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.1)
    
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab
    
  libavutil      55. 18.100 / 55. 18.100
    
  libavcodec     57. 24.103 / 57. 24.103
    
  libavformat    57. 25.100 / 57. 25.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 32.100 /  6. 32.100
    
  libavresample   3.  0.  0 /  3.  0.  0
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input_sintel_trailer_720p.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 1970-01-01 00:00:00
    
    title           : Sintel Trailer
    
    artist          : Durian Open Movie Team
    
    encoder         : Lavf52.62.0
    
    copyright       : (c) copyright Blender Foundation | durian.blender.org
    
    description     : Trailer for the Sintel open movie project
    
  Duration: 00:00:52.21, start: 0.000000, bitrate: 1165 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 1033 kb/s, 24 fps, 24 tbr, 24 tbn, 48 tbc (default)
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 126 kb/s (default)
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
      handler_name    : SoundHandler
    
[Parsed_subtitles_1 @ 0x2bdb700] Shaper: FriBidi 0.19.6 (SIMPLE) HarfBuzz-ng 0.9.27 (COMPLEX)
    
[Parsed_subtitles_1 @ 0x2bdb700] Using font provider fontconfig
    
[libx264 @ 0x2bc8b60] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
    
[libx264 @ 0x2bc8b60] profile Constrained Baseline, level 4.0
    
Output #0, hls, to 'videos/4444/index_4444_360_.m3u8':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    description     : Trailer for the Sintel open movie project
    
    title           : Sintel Trailer
    
    artist          : Durian Open Movie Team
    
    copyright       : (c) copyright Blender Foundation | durian.blender.org
    
    encoder         : Lavf57.25.100
    
    Stream #0:0(und): Video: h264 (libx264), yuv420p, 640x360, q=-1--1, 24 fps, 24 tbn, 24 tbc (default)
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
      handler_name    : VideoHandler
    
      encoder         : Lavc57.24.103 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    
    Stream #0:1(und): Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s (default)
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
      handler_name    : SoundHandler
    
      encoder         : Lavc57.24.103 aac
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
    
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
    
Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory
    
[aac @ 0x2bc9ac0] Qavg: -nan
    
(ffmpeg)aameer@falcon:~/Documents/projects/ffmpeg$

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