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  • What is the correct way to write Frames in ffmpeg

    6 février 2020, par hagor

    I am working on some ffmpeg writer implementation and I can not undrestand what do I do wrong.
    I have a mdf (media digital file) file which I need to convert to avi and I have a software that does it. The test case : Avi file I get from my software and avi file I get from software are identical.
    I can get frames from input mdf file, and can convert them to bmps correctly. So I suppose I do something wrong with ffmpeg.
    I also need to use raw RGB codec in ffmpeg.

    Here is the code I wrote to fill avi files with frames :

    if (hOffLoaderDVR && m_hDeviceCollection && device && hDriveSetDVR && hFile)
    
                    { 
    
                        std::string camSuffix = "_cam_";
    
                        std::string cameraName = hFile->streamByIndex(streamC)->cameraPortName().c_str();
    
                        std::string fileName = pathToAviDir + hFile->parameters()->name.c_str() + camSuffix + cameraName + std::to_string(streamC).c_str() + ".avi";
    

    
                        Offload::Request request;
    
                        Common::DataTypeHandle cameraParams = hFile->streamByIndex(streamC)->streamView()->dataType();
    

    
                        AVFrame* frame = m_ffwriter.alloc_picture(AV_PIX_FMT_BGR24, cameraParams->width(), cameraParams->height());
    

    
                        size_t datasize = hFile->streamByIndex(streamC)->streamView()->frameAtIndex(0)->buffer()->size();  // size in bytes 
    

    
                        RecordingParams params(fileName, cameraParams->width(), cameraParams->height(), 50,
    
                            AV_PIX_FMT_BGR24, datasize);
    

    
                        frame->pkt_size = datasize;
    
                        m_ffwriter.delayedOpen(params);
    

    
                        for (unsigned int frameC = 0; frameC < hFile->streamByIndex(streamC)->streamView()->frameCount(); frameC++)
    
                        {
    
                            m_ffwriter.fill_rgb_image(frame, hFile->streamByIndex(streamC)->streamView()->frameAtIndex(frameC)->buffer()->data());
    
                            m_ffwriter.putImage(frame);
    
                        }
    
                        m_ffwriter.close();
    
                        av_frame_free(&frame);
    

    
                    }

    To open the AVI file I use the function ffmpegWriter::delayedOpen :

    bool FfmpegWriter::delayedOpen(const RecordingParams & params) {
    

    
    unsigned int w = params.getWidth();
    
    unsigned int h = params.getHeight();
    
    unsigned int framerate = params.getFramerate();
    
    unsigned int datasize = params.getDataSize();
    
    m_filename = params.getPath();
    

    
    unsigned int sample_rate = 0; //default 
    
    unsigned int channels = 0;    //default
    

    
    m_delayed = false;
    
    if (w <= 0 || h <= 0) {
    
        m_delayed = true;
    
        return true;
    
    }
    
    m_ready = true;
    

    
    // auto detect the output format from the name. default is mpeg.
    
    m_fmt = av_guess_format(nullptr, m_filename.c_str(), nullptr);
    
    m_fmt->video_codec = AV_CODEC_ID_RAWVIDEO; //can be moved to a parameter if required 
    

    
    if (!m_fmt) {
    
        printf("Could not deduce output format from file extension: using MPEG.\n");
    
        m_fmt = av_guess_format("mpeg", nullptr, nullptr);
    
    }
    

    
    if (!m_fmt) {
    
        fprintf(stderr, "Could not find suitable output format\n");
    
        ::exit(1);
    
    }
    

    

    
    // allocate the output media context 
    
    m_oc = avformat_alloc_context();
    
    if (!m_oc) {
    
        fprintf(stderr, "Memory error\n");
    
        ::exit(1);
    
    }
    
    m_oc->oformat = m_fmt;
    
    m_fmt->flags = AVFMT_NOTIMESTAMPS;
    

    

    
    snprintf(m_oc->filename, sizeof(m_oc->filename), "%s", m_filename.c_str());
    

    
    // add the audio and video streams using the default format codecs
    
    // and initialize the codecs 
    
    m_video_st = nullptr;
    
    m_audio_st = nullptr;
    

    
    if (m_fmt->video_codec != AV_CODEC_ID_NONE) {
    
        m_video_st = add_video_stream(m_oc, m_fmt->video_codec, w, h, framerate);
    
    }
    

    
    av_dump_format(m_oc, 0, m_filename.c_str(), 1);
    

    
    // now that all the parameters are set, we can open 
    
    // video codecs and allocate the necessary encode buffers 
    

    
    if (m_video_st) {
    
        open_video(m_oc, m_video_st, datasize);
    
    }
    

    
    // open the output file, if needed 
    
    if (!(m_fmt->flags & AVFMT_NOFILE)) {
    
        if (avio_open(&m_oc->pb, m_filename.c_str(), AVIO_FLAG_WRITE) < 0) {
    
            fprintf(stderr, "Could not open '%s'\n", m_filename.c_str());
    
            ::exit(1);
    
        }
    
    }
    

    
    // write the stream header, if any
    
    avformat_write_header(m_oc, NULL);
    
    return true;
    
}

    And to fill images and put them into the AVI I use these functions :

    void FfmpegWriter::fill_rgb_image(AVFrame *pict, void *p)
    
{
    

    
    memcpy(pict->data[0], p, pict->pkt_size);
    

    
}
    
bool FfmpegWriter::putImage(AVFrame * newFrame) {
    
    if (m_delayed) {
    
        // savedConfig.put("width",Value((int)image.width()));
    
       //  savedConfig.put("height",Value((int)image.height()));
    
    }
    
    if (!isOk()) {
    
        return false;
    
    }
    

    
    if (m_video_st) {
    
        m_video_pts = (double)av_stream_get_end_pts(m_video_st) *m_video_st->time_base.num / m_video_st->time_base.den;
    
    }
    
    else {
    
        m_video_pts = 0.0;
    
    }
    

    
    if (!(m_video_st)) {
    
        return false;
    
    }
    

    
    // write interleaved video frame
    
    write_video_frame(m_oc, m_video_st, newFrame);
    

    
    return true;
    
}

    Do I not open context correctly ? Or where might be the problem ? The problems I can see are that the output AVI has around minute delay in the beginning with no frames changing, and the video channels behave differently(it seems that red and blue dissapeared). Does it make any difference to use other format ? I currently use AV_PIX_FMT_BGR24 which seems to be correct (I can visualize frames from the same pointer correctly).

    Thank you for your help !

  • How to Read DJI H264 FPV Feed as OpenCV Mat Object ?

    29 mai 2019, par Walter Morawa

    TDLR : All DJI developers would benefit from decoding raw H264 video stream byte arrays to a format compatible with OpenCV.

    I’ve spent a lot of time looking for a solution to reading DJI’s FPV feed as an OpenCV Mat object. I am probably overlooking something fundamental, since I am not too familiar with Image Encoding/Decoding.

    Future developers who come across it will likely run into a bunch of the same issues I had. It would be great if DJI developers could use opencv directly without needing a 3rd party library.

    I’m willing to use ffmpeg or JavaCV if necessary, but that’s quite the hurdle for most Android developers as we’re going to have to use cpp, ndk, terminal for testing, etc. That seems like overkill. Both options seem quite time consuming. This JavaCV H264 conversion seems unnecessarily complex. I found it from this relevant question.

    I believe the issue lies in the fact that we need to decode both the byte array of length 6 (info array) and the byte array with current frame info simultaneously.

    Basically, DJI’s FPV feed comes in a number of formats.

    1. Raw H264 (MPEG4) in VideoFeeder.VideoDataListener
        // The callback for receiving the raw H264 video data for camera live view
    
    mReceivedVideoDataListener = new VideoFeeder.VideoDataListener() {
    
        @Override
    
        public void onReceive(byte[] videoBuffer, int size) {
    
            //Log.d("BytesReceived", Integer.toString(videoStreamFrameNumber));
    
            if (videoStreamFrameNumber++%30 == 0){
    
                //convert video buffer to opencv array
    
                OpenCvAndModelAsync openCvAndModelAsync = new OpenCvAndModelAsync();
    
                openCvAndModelAsync.execute(videoBuffer);
    
            }
    
            if (mCodecManager != null) {
    
                mCodecManager.sendDataToDecoder(videoBuffer, size);
    
            }
    
        }
    
    };
    1. DJI also has it’s own Android decoder sample with FFMPEG to convert to YUV format.
        @Override
    
    public void onYuvDataReceived(final ByteBuffer yuvFrame, int dataSize, final int width, final int height) {
    
        //In this demo, we test the YUV data by saving it into JPG files.
    
        //DJILog.d(TAG, "onYuvDataReceived " + dataSize);
    
        if (count++ % 30 == 0 && yuvFrame != null) {
    
            final byte[] bytes = new byte[dataSize];
    
            yuvFrame.get(bytes);
    
            AsyncTask.execute(new Runnable() {
    
                @Override
    
                public void run() {
    
                    if (bytes.length >= width * height) {
    
                        Log.d("MatWidth", "Made it");
    
                        YuvImage yuvImage = saveYuvDataToJPEG(bytes, width, height);
    
                        Bitmap rgbYuvConvert = convertYuvImageToRgb(yuvImage, width, height);
    

    
                        Mat yuvMat = new Mat(height, width, CvType.CV_8UC1);
    
                        yuvMat.put(0, 0, bytes);
    
                        //OpenCv Stuff
    
                    }
    
                }
    
            });
    
        }
    
    }

    Edit : For those who want to see DJI’s YUV to JPEG function, here it is from the sample application :

    private YuvImage saveYuvDataToJPEG(byte[] yuvFrame, int width, int height){
    
        byte[] y = new byte[width * height];
    
        byte[] u = new byte[width * height / 4];
    
        byte[] v = new byte[width * height / 4];
    
        byte[] nu = new byte[width * height / 4]; //
    
        byte[] nv = new byte[width * height / 4];
    

    
        System.arraycopy(yuvFrame, 0, y, 0, y.length);
    
        Log.d("MatY", y.toString());
    
        for (int i = 0; i < u.length; i++) {
    
            v[i] = yuvFrame[y.length + 2 * i];
    
            u[i] = yuvFrame[y.length + 2 * i + 1];
    
        }
    
        int uvWidth = width / 2;
    
        int uvHeight = height / 2;
    
        for (int j = 0; j < uvWidth / 2; j++) {
    
            for (int i = 0; i < uvHeight / 2; i++) {
    
                byte uSample1 = u[i * uvWidth + j];
    
                byte uSample2 = u[i * uvWidth + j + uvWidth / 2];
    
                byte vSample1 = v[(i + uvHeight / 2) * uvWidth + j];
    
                byte vSample2 = v[(i + uvHeight / 2) * uvWidth + j + uvWidth / 2];
    
                nu[2 * (i * uvWidth + j)] = uSample1;
    
                nu[2 * (i * uvWidth + j) + 1] = uSample1;
    
                nu[2 * (i * uvWidth + j) + uvWidth] = uSample2;
    
                nu[2 * (i * uvWidth + j) + 1 + uvWidth] = uSample2;
    
                nv[2 * (i * uvWidth + j)] = vSample1;
    
                nv[2 * (i * uvWidth + j) + 1] = vSample1;
    
                nv[2 * (i * uvWidth + j) + uvWidth] = vSample2;
    
                nv[2 * (i * uvWidth + j) + 1 + uvWidth] = vSample2;
    
            }
    
        }
    
        //nv21test
    
        byte[] bytes = new byte[yuvFrame.length];
    
        System.arraycopy(y, 0, bytes, 0, y.length);
    
        for (int i = 0; i < u.length; i++) {
    
            bytes[y.length + (i * 2)] = nv[i];
    
            bytes[y.length + (i * 2) + 1] = nu[i];
    
        }
    
        Log.d(TAG,
    
              "onYuvDataReceived: frame index: "
    
                  + DJIVideoStreamDecoder.getInstance().frameIndex
    
                  + ",array length: "
    
                  + bytes.length);
    
        YuvImage yuver = screenShot(bytes,Environment.getExternalStorageDirectory() + "/DJI_ScreenShot", width, height);
    
        return yuver;
    
    }
    

    
    /**
    
     * Save the buffered data into a JPG image file
    
     */
    
    private YuvImage screenShot(byte[] buf, String shotDir, int width, int height) {
    
        File dir = new File(shotDir);
    
        if (!dir.exists() || !dir.isDirectory()) {
    
            dir.mkdirs();
    
        }
    
        YuvImage yuvImage = new YuvImage(buf,
    
                ImageFormat.NV21,
    
                width,
    
                height,
    
                null);
    

    
        OutputStream outputFile = null;
    

    
        final String path = dir + "/ScreenShot_" + System.currentTimeMillis() + ".jpg";
    

    
        try {
    
            outputFile = new FileOutputStream(new File(path));
    
        } catch (FileNotFoundException e) {
    
            Log.e(TAG, "test screenShot: new bitmap output file error: " + e);
    
            //return;
    
        }
    
        if (outputFile != null) {
    
            yuvImage.compressToJpeg(new Rect(0,
    
                    0,
    
                    width,
    
                    height), 100, outputFile);
    
        }
    
        try {
    
            outputFile.close();
    
        } catch (IOException e) {
    
            Log.e(TAG, "test screenShot: compress yuv image error: " + e);
    
            e.printStackTrace();
    
        }
    

    
        runOnUiThread(new Runnable() {
    
            @Override
    
            public void run() {
    
                displayPath(path);
    
            }
    
        });
    
        return yuvImage;
    
    }
    1. DJI also appears to have a "getRgbaData" function, but there is literally not a single example online or by DJI. Go ahead and Google "DJI getRgbaData"... There’s only the reference to the api documentation that explains the self explanatory parameters and return values but nothing else. I couldn’t figure out where to call this and there doesn’t appear to be a callback function as there is with YUV. You can’t call it from the h264b byte array directly, but perhaps you can get it from the yuv data.

    Option 1 is much more preferable to option 2, since YUV format has quality issues. Option 3 would also likely involve a decoder.

    Here’s a screenshot that DJI’s own YUV conversion produces. WalletPhoneYuv

    I’ve looked at a bunch of things about how to improve the YUV, remove green and yellow colors and whatnot, but at this point if DJI can’t do it right, I don’t want to invest resources there.

    Regarding Option 1, I know there’s FFMPEG and JavaCV that seem like good options if I have to go the video decoding route.

    Moreover, from what I understand, OpenCV can’t handle reading and writing video files without FFMPEG, but I’m not trying to read a video file, I am trying to read an H264/MPEG4 byte[] array. The following code seems to get positive results.

        /* Async OpenCV Code */
    
    private class OpenCvAndModelAsync extends AsyncTask {
    
        @Override
    
        protected double[] doInBackground(byte[]... params) {//Background Code Executing. Don't touch any UI components
    
            //get fpv feed and convert bytes to mat array
    
            Mat videoBufMat = new Mat(4, params[0].length, CvType.CV_8UC4);
    
            videoBufMat.put(0,0, params[0]);
    
            //if I add this in it says the bytes are empty.
    
            //Mat videoBufMat = Imgcodecs.imdecode(encodeVideoBuf, Imgcodecs.IMREAD_ANYCOLOR);
    
            //encodeVideoBuf.release();
    
            Log.d("MatRgba", videoBufMat.toString());
    
            for (int i = 0; i< videoBufMat.rows(); i++){
    
                for (int j=0; j< videoBufMat.cols(); j++){
    
                    double[] rgb = videoBufMat.get(i, j);
    
                    Log.i("Matrix", "red: "+rgb[0]+" green: "+rgb[1]+" blue: "+rgb[2]+" alpha: "
    
                            + rgb[3] + " Length: " + rgb.length + " Rows: "
    
                            + videoBufMat.rows() + " Columns: " + videoBufMat.cols());
    
                }
    
            }
    
            double[] center = openCVThingy(videoBufMat);
    
            return center;
    
        }
    
        protected void onPostExecute(double[] center) {
    
            //handle ui or another async task if necessary
    
        }
    
    }

    Rows = 4, Columns > 30k. I get lots of RGB values that seem valid, such as red = 113, green=75, blue=90, alpha=220 as a made up example ; however, I get a ton of 0,0,0,0 values. That should be somewhat okay, since Black is 0,0,0 (although I would have thought the alpha would be higher) and I have a black object in my image. I also don’t seem to get any white values 255, 255, 255, even though there is also plenty of white area. I’m not logging the entire byte so it could be there, but I have yet to see it.

    However, when I try to compute the contours from this image, I almost always get that the moments (center x, y) are exactly in the center of the image. This error has nothing to do with my color filter or contours algorithm, as I wrote a script in python and tested that I implemented it correctly in Android by reading a still image and getting the exact same number of contours, position, etc in both Python and Android.

    I noticed it has something to do with the videoBuffer byte size (bonus points if you can explain why every other length is 6)

    2019-05-23 21:14:29.601 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 2425
    
2019-05-23 21:14:29.802 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 2659
    
2019-05-23 21:14:30.004 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 6
    
2019-05-23 21:14:30.263 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 6015
    
2019-05-23 21:14:30.507 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 6
    
2019-05-23 21:14:30.766 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 4682
    
2019-05-23 21:14:31.005 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 6
    
2019-05-23 21:14:31.234 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 2840
    
2019-05-23 21:14:31.433 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 4482
    
2019-05-23 21:14:31.664 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 6
    
2019-05-23 21:14:31.927 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 4768
    
2019-05-23 21:14:32.174 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 6
    
2019-05-23 21:14:32.433 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 4700
    
2019-05-23 21:14:32.668 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 6
    
2019-05-23 21:14:32.864 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 4740
    
2019-05-23 21:14:33.102 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 6
    
2019-05-23 21:14:33.365 21431-22086/com.dji.simulatorDemo D/VideoBufferSize: 4640

    My questions :

    I. Is this the correct format to read an h264 byte as mat ?
    Assuming the format is RGBA, that means row = 4 and columns = byte[].length, and CvType.CV_8UC4. Do I have height and width correct ? Something tells me YUV height and width is off. I was getting some meaningful results, but the contours were exactly in the center, just like with the H264.

    II. Does OpenCV handle MP4 in android like this ? If not, do we need to use FFMPEG or JavaCV ?

    III. Does the int size have something to do with it ? Why is the int size occassionally 6, and other times 2400 to 6000 ? I’ve heard about the difference between this frames information and information about the next frame, but I’m simply not knowledgeable enough to know how to apply that here.

    I’m starting to think this is where the issue lies. Since I need to get the 6 byte array for info about next frame, perhaps my modulo 30 is incorrect. So should I pass the 29th or 31st frame as a format byte for each frame ? How is that done in opencv or are we doomed to use the complicated ffmpeg ? How would I go about joining the neighboring frames/ byte arrays ?

    IV. Can I fix this using Imcodecs ? I was hoping opencv would natively handle whether a frame was color from this frame or info about next frame. I added the below code, but I am getting an empty array :

    Mat videoBufMat = Imgcodecs.imdecode(new MatOfByte(params[0]), Imgcodecs.IMREAD_UNCHANGED);

    This also is empty :

    Mat encodeVideoBuf = new Mat(4, params[0].length, CvType.CV_8UC4);
    
encodeVideoBuf.put(0,0, params[0]);
    
Mat videoBufMat = Imgcodecs.imdecode(encodeVideoBuf, Imgcodecs.IMREAD_UNCHANGED);

    V. Should I try converting the bytes into Android jpeg and then import it ? Why is djis yuv decoder so complicated looking ? It makes me cautious from wanting to try ffmpeg or Javacv and just stick to Android decoder or opencv decoder.

    VI. At what stage should I resize the frames to speed up calculations ?

    Edit : DJI support got back to me and confirmed they don’t have any samples for doing what I’ve described. This is a time for we the community to make this available for everyone !

    Upon further research, I don’t think opencv will be able to handle this as opencv’s android sdk has no functionality for video files/url’s (apart from a homegrown MJPEG codec).

    So is there a way in Android to convert to mjpeg or similar in order to read ? In my application, I only need 1 or 2 frames per second, so perhaps I can save the image as jpeg.

    But for real time applications we will likely need to write our own decoder. Please help so that we can make this available to everyone ! This question seems promising :

  • Performance issue in streaming desktop out of a Raspberry with FFMPEG

    30 avril 2021, par skynet

    I'm quite a newbie in FFMPEG and I apologize in advance for any inaccuracy I may write.

    


    My goal is to stream over UDP a Full HD (1920x1080) desktop connected to a Raspberry PI 4 - 4 GB RAM.

    


    I made many attempts, and currently this the setup with better performance I found (I used the knowledge in https://www.willusher.io/general/2020/11/15/hw-accel-encoding-rpi4).

    


      

    1. I installed the 64-bit Raspbian OS on the PI from this link : https://www.raspberrypi.org/forums/viewtopic.php?t=275370

      2. 


    


    This because the HW H264 encoder (h264_v4l2m2m) is faster than the 32-bit encoder h264_omx

    


      

    1. I downloaded and installed FFMPEG 4.4, using this configuration
./configure —prefix="$HOME/ffmpeg_build" —pkg-config-flags="pkg-config —static" —extra-cflags="-I$HOME/ffmpeg_build/include" —extra-ldflags="-L$HOME/ffmpeg_build/lib" —extra-libs="-lpthread -lm" —bindir="$HOME/bin" —enable-gpl —enable-gnutls —disable-libaom —enable-libass —enable-libfdk-aac —enable-libfreetype —enable-libmp3lame —enable-libopus —enable-libvorbis —enable-libvpx —enable-libx264 —disable-libx265 —enable-nonfree —arch=aarch64 —disable-libxml2 —enable-libwebp—enable-libdrm

      2. 


    


    I used FFMPEG 4.4 because of compatibility issues with h264_v4l2m2m of the shipped FFMPEG version 4.1.4

    


      


    1. I use this command

      


      ffmpeg -f x11grab -probesize 42M -s 1920x1080 -i :0.0 -c:a copy -c:v h264_v4l2m2m -num_output_buffers 32 -num_capture_buffers 16 -b:v 8M -minrate 8M -maxrate 8M -pix_fmt rgb24 -f mpegts udp ://239.255.90.60:5004 ?pkt_size=1316

      


      2. 


    


    The -pix_fmt rgb24 flag is needed because x11grab in 64 bit OS use BGR0 chroma subsampling... which means red and blue colours are inverted !

    


    This is the output :

    


    ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers  
  built with gcc 8 (Debian 8.3.0-6)  
  configuration: --prefix=/home/pi/ffmpeg_build --pkg-config-flags='pkg-config --static' --extra-cflags=-I/home/pi/ffmpeg_build/include --extra-ldflags=-L/home/pi/ffmpeg_build/lib --extra-libs='-lpthread -lm' --enable-gpl --enable-gnutls --disable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --disable-libx265 --enable-nonfree --arch=aarch64 --disable-libxml2 --enable-libwebp --enable-libdrm  
  libavutil      56. 70.100 / 56. 70.100  
  libavcodec     58.134.100 / 58.134.100  
  libavformat    58. 76.100 / 58. 76.100  
  libavdevice    58. 13.100 / 58. 13.100  
  libavfilter     7.110.100 /  7.110.100  
  libswscale      5.  9.100 /  5.  9.100  
  libswresample   3.  9.100 /  3.  9.100  
  libpostproc    55.  9.100 / 55.  9.100  
Input #0, x11grab, from ':0.0':  
  Duration: N/A, start: 1619778505.990981, bitrate: 1988667 kb/s  
  Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, 1988667 kb/s, 29.97 fps, 56   tbr, 1000k tbn, 1000k tbc  
Stream mapping:  
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (h264_v4l2m2m))  
Press [q] to stop, [?] for help  
[h264_v4l2m2m @ 0x5598d14070] Using device /dev/video11  
[h264_v4l2m2m @ 0x5598d14070] driver 'bcm2835-codec' on card 'bcm2835-codec-encode' in mplane mode  
[h264_v4l2m2m @ 0x5598d14070] requesting formats: output=RGB3 capture=H264  
[h264_v4l2m2m @ 0x5598d14070] Failed to set gop size: Invalid argument  
Output #0, mpegts, to 'udp://239.255.90.60:5004?pkt_size=1316':  
  Metadata:  
    encoder         : Lavf58.76.100  
  Stream #0:0: Video: h264, rgb24(pc, progressive), 1920x1080, q=2-31, 8000 kb/s, 56 fps, 90k tbn  
    Metadata:  
      encoder         : Lavc58.134.100 h264_v4l2m2m  
[mpegts @ 0x5598d12c10] Non-monotonous DTS in output stream 0:0; previous: 0, current: 0; changing   to 1. This may result in incorrect timestamps in the output file.  
frame=  799 fps= 16 q=-0.0 size=   16180kB time=00:00:49.19 bitrate=2694.2kbits/s speed=   1x 


    


    As you can see my issue is that the fps value is about 15 when streaming an HD video with VLC in full-screen mode (the fps value depends on what is displayed on screen, which I find odd being the encoding process should be done in HW).

    


    So the question is : any hope I can get close to 25 fps, so to have a smooth display on the receiver ? Either using a better FFMPEG command or tweaking the Raspberry ?

    


    Thanks for any help !

    


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