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• How to minimize latency in ffmpeg stream Java ?

  13 juillet 2022, par Taavi Sõerd

  I need to stream ffmpeg video feed in android studio and need minimal latency. Code below has achieved that when playing on galaxy s21 ultra but when I play it on galaxy tab then it's like in slow motion. When i set buffer size to 0 I get minimal latency but can't actually even see the video as it's all corrupted (all gray and colored noise).

  


  public class Decode implements Runnable {
public Activity activity;
AVFrame pFrameRGB;
SwsContext sws_ctx;
ByteBuffer bitmapBuffer;
Bitmap bmp;
byte[] array;
int imageViewWidth = 0;
int imageViewHeight = 0;
boolean imageChanged = true;
int v_stream_idx = -1;
int klv_stream_idx = -1;

boolean imageDrawMutex = false;

boolean imageIsSet = false;
ImageView imageView =  MainActivity.getmInstanceActivity().findViewById(R.id.imageView);

String mFilename = "udp://@" + MainActivity.connectionIP;;
UasDatalinkLocalSet mLatestDls;

public Decode(Activity _activity) {
    this.activity = _activity;
}

public void create_decoder(AVCodecContext codec_ctx) {
    imageChanged = true;

    // Determine required buffer size and allocate buffer
    int numBytes =av_image_get_buffer_size(AV_PIX_FMT_RGBA, codec_ctx.width(),
            codec_ctx.height(), 1);
    BytePointer buffer = new BytePointer(av_malloc(numBytes));

    bmp = Bitmap.createBitmap(codec_ctx.width(), codec_ctx.height(), Bitmap.Config.ARGB_8888);

    array = new byte[codec_ctx.width() * codec_ctx.height() * 4];
    bitmapBuffer = ByteBuffer.wrap(array);

    sws_ctx = sws_getContext(
            codec_ctx.width(),
            codec_ctx.height(),
            codec_ctx.pix_fmt(),
            codec_ctx.width(),
            codec_ctx.height(),
            AV_PIX_FMT_RGBA,
            SWS_POINT,
            null,
            null,
            (DoublePointer) null
    );

    if (sws_ctx == null) {
        Log.d("app", "Can not use sws");
        throw new IllegalStateException();
    }

    av_image_fill_arrays(pFrameRGB.data(), pFrameRGB.linesize(),
            buffer, AV_PIX_FMT_RGBA, codec_ctx.width(), codec_ctx.height(), 1);
}

@Override
public void run() {
    Log.d("app", "Start decoder");

    int ret = -1, i = 0;
    String vf_path = mFilename;

    AVFormatContext fmt_ctx = new AVFormatContext(null);
    AVPacket pkt = new AVPacket();


    AVDictionary multicastDict = new AVDictionary();

    av_dict_set(multicastDict, "rtsp_transport", "udp_multicast", 0);

    av_dict_set(multicastDict, "localaddr", getIPAddress(true), 0);
    av_dict_set(multicastDict, "reuse", "1", 0);

    av_dict_set(multicastDict, "buffer_size", "0.115M", 0);

    ret = avformat_open_input(fmt_ctx, vf_path, null, multicastDict);
    if (ret < 0) {
        Log.d("app", String.format("Open video file %s failed \n", vf_path));
        byte[] error_message = new byte[1024];
        int elen = av_strerror(ret, error_message, 1024);
        String s = new String(error_message, 0, 20);
        Log.d("app", String.format("Return: %d", ret));
        Log.d("app", String.format("Message: %s", s));
        throw new IllegalStateException();
    }
    
    if (avformat_find_stream_info(fmt_ctx, (PointerPointer) null) < 0) {
        //System.exit(-1);
        Log.d("app", "Stream info not found");
    }


    avformat.av_dump_format(fmt_ctx, 0, mFilename, 0);

    int nstreams = fmt_ctx.nb_streams();

    for (i = 0; i < fmt_ctx.nb_streams(); i++) {
        if (fmt_ctx.streams(i).codecpar().codec_type() == AVMEDIA_TYPE_VIDEO) {
            v_stream_idx = i;
        }
        if (fmt_ctx.streams(i).codecpar().codec_type() == AVMEDIA_TYPE_DATA) {
            klv_stream_idx = i;
        }
    }
    if (v_stream_idx == -1) {
        Log.d("app", "Cannot find video stream");
        throw new IllegalStateException();
    } else {
        Log.d("app", String.format("Video stream %d with resolution %dx%d\n", v_stream_idx,
                fmt_ctx.streams(v_stream_idx).codecpar().width(),
                fmt_ctx.streams(v_stream_idx).codecpar().height()));
    }

    AVCodecContext codec_ctx = avcodec_alloc_context3(null);
    avcodec_parameters_to_context(codec_ctx, fmt_ctx.streams(v_stream_idx).codecpar());


    AVCodec codec = avcodec_find_decoder(codec_ctx.codec_id());


    AVDictionary avDictionary = new AVDictionary();

    av_dict_set(avDictionary, "fflags", "nobuffer", 0);


    if (codec == null) {
        Log.d("app", "Unsupported codec for video file");
        throw new IllegalStateException();
    }
    ret = avcodec_open2(codec_ctx, codec, avDictionary);
    if (ret < 0) {
        Log.d("app", "Can not open codec");
        throw new IllegalStateException();
    }

    AVFrame frm = av_frame_alloc();

    // Allocate an AVFrame structure
    pFrameRGB = av_frame_alloc();
    if (pFrameRGB == null) {
        //System.exit(-1);
        Log.d("app", "unable to init pframergb");
    }

    create_decoder(codec_ctx);

    int width = codec_ctx.width();
    int height = codec_ctx.height();

    double fps = 15;
    

    while (true) {
        try {
            Thread.sleep(1);
        } catch (Exception e) {

        }

        try {
            if (av_read_frame(fmt_ctx, pkt) >= 0) {
                if (pkt.stream_index() == v_stream_idx) {
                    avcodec_send_packet(codec_ctx, pkt);

                    if (codec_ctx.width() != width || codec_ctx.height() != height) {
                        create_decoder(codec_ctx);
                        width = codec_ctx.width();
                        height = codec_ctx.height();
                    }
                }

                if (pkt.stream_index() == klv_stream_idx) {

                    byte[] klvDataBuffer = new byte[pkt.size()];

                    for (int j = 0; j < pkt.size(); j++) {
                        klvDataBuffer[j] = pkt.data().get(j);
                    }

                    try {
                        KLV k = new KLV(klvDataBuffer, KLV.KeyLength.SixteenBytes, KLV.LengthEncoding.BER);
                        byte[] main_payload = k.getValue();

                        // decode the Uas Datalink Local Set from main_payload binary blob.
                        mLatestDls = new UasDatalinkLocalSet(main_payload);

                        if (mLatestDls != null) {

                            MainActivity.getmInstanceActivity().runOnUiThread(new Runnable() {
                                @RequiresApi(api = Build.VERSION_CODES.Q)
                                @Override
                                public void run() {
                                    MainActivity.getmInstanceActivity().updateKlv(mLatestDls);
                                }
                            });
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    
                }

                int wasFrameDecoded = 0;
                while (wasFrameDecoded >= 0) {
                    wasFrameDecoded = avcodec_receive_frame(codec_ctx, frm);

                    if (wasFrameDecoded >= 0) {
                        // get clip fps
                        fps = 15; //av_q2d(fmt_ctx.streams(v_stream_idx).r_frame_rate());

                        sws_scale(
                                sws_ctx,
                                frm.data(),
                                frm.linesize(),
                                0,
                                codec_ctx.height(),
                                pFrameRGB.data(),
                                pFrameRGB.linesize()
                        );

                        if(!imageDrawMutex) {
                            MainActivity.getmInstanceActivity().runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    if (imageIsSet) {
                                        imageDrawMutex = true;
                                        pFrameRGB.data(0).position(0).get(array);
                                        bitmapBuffer.rewind();
                                        bmp.copyPixelsFromBuffer(bitmapBuffer);

                                        if (imageChanged) {
                                            (imageView).setImageBitmap(bmp);
                                            imageChanged = false;
                                        }

                                        (imageView).invalidate();
                                        imageDrawMutex = false;
                                    } else {
                                        (imageView).setImageBitmap(bmp);
                                        imageIsSet = true;
                                    }
                                }
                            });
                        }
                    }
                }
                av_packet_unref(pkt);

            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        if (false) {
            Log.d("threads", "false");

            av_frame_free(frm);

            avcodec_close(codec_ctx);
            avcodec_free_context(codec_ctx);

            avformat_close_input(fmt_ctx);
        }
    }
}


  


  This code is running in Android Studio with Java. I'm quite new on this topic so not really sure even where to start.
What could be the cause of that ?

  


• Get_iplayer not converting to MP4 [closed]

  16 juin 2022, par PhilDunford

  get_iplayer

  


  I know that this is an old piece of code, but it still does a great job.

  


  In the last week or so it's stopped converting the .ts files to .mp4. I've seem this mentioned elsewhere, but no solution. I think the key line among many error messages may be 'unable to determine ffmpeg version'.

  


  I assume the BBC has done something to break it (this has happened many times before).

  


  Needs someone much cleverer than me to fix it. Does anyone still update the code or know a work around ?

  


• ffmpeg droping framerate on capture device

  8 avril 2022, par Rudi

  i have a hdmi capture device which seems to drop frames every now and then :

  


  ffmpeg version 4.1.8-0+enter code heredeb10u1+rpt1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared --libdir=/usr/lib/arm-linux-gnueabihf --cpu=arm1176jzf-s --arch=arm
  WARNING: library configuration mismatch
  avutil      configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  avcodec     configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  avformat    configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  avdevice    configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  avfilter    configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  avresample  configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  swscale     configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  swresample  configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  postproc    configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
[mjpeg @ 0x1067210] Found EOI before any SOF, ignoring
[mjpeg @ 0x1067210] No JPEG data found in image
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 6996.350004, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1920x1080, 60 fps, 60 tbr, 1000k tbn, 1000k tbc
Output #0, mp4, to 'testfjfjfjf.mp4':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: mjpeg (mp4v / 0x7634706D), yuvj422p(pc, bt470bg/unknown/unknown), 1920x1080, q=2-31, 60 fps, 60 tbr, 15360 tbn, 30 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
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frame= 3149 fps= 60 q=-1.0 size=  363520kB time=00:00:52.86 bitrate=56333.0kbits/s speed=   1x    
frame= 3179 fps= 60 q=-1.0 size=  366592kB time=00:00:53.36 bitrate=56276.7kbits/s speed=   1x    
frame= 3209 fps= 60 q=-1.0 size=  369664kB time=00:00:53.86 bitrate=56221.4kbits/s speed=   1x    
frame= 3239 fps= 60 q=-1.0 size=  372480kB time=00:00:54.36 bitrate=56128.6kbits/s speed=   1x    
frame= 3270 fps= 60 q=-1.0 size=  374784kB time=00:00:54.87 bitrate=55944.7kbits/s speed=   1x    
frame= 3300 fps= 60 q=-1.0 size=  377088kB time=00:00:55.37 bitrate=55780.3kbits/s speed=   1x    
frame= 3331 fps= 60 q=-1.0 size=  379392kB time=00:00:55.89 bitrate=55599.0kbits/s speed=   1x    
frame= 3361 fps= 60 q=-1.0 size=  381696kB time=00:00:56.39 bitrate=55440.7kbits/s speed=   1x    
frame= 3392 fps= 60 q=-1.0 size=  384256kB time=00:00:56.91 bitrate=55306.6kbits/s speed=   1x    
frame= 3422 fps= 60 q=-1.0 size=  386560kB time=00:00:57.41 bitrate=55153.6kbits/s speed=   1x    
frame= 3452 fps= 60 q=-1.0 size=  388864kB time=00:00:57.91 bitrate=55003.2kbits/s speed=   1x    
frame= 3482 fps= 60 q=-1.0 size=  391168kB time=00:00:58.41 bitrate=54855.5kbits/s speed=   1x    
frame= 3512 fps= 60 q=-1.0 size=  393472kB time=00:00:58.91 bitrate=54710.2kbits/s speed=   1x    
frame= 3543 fps= 60 q=-1.0 size=  395776kB time=00:00:59.43 bitrate=54552.7kbits/s speed=   1x    
frame= 3556 fps= 59 q=-1.0 size=  396800kB time=00:00:59.64 bitrate=54495.9kbits/s speed=0.991x    
frame= 3616 fps= 60 q=-1.0 size=  401408kB time=00:01:00.71 bitrate=54158.8kbits/s speed=   1x    
frame= 3646 fps= 60 q=-1.0 size=  403712kB time=00:01:01.21 bitrate=54024.8kbits/s speed=   1x    
frame= 3677 fps= 60 q=-1.0 size=  406016kB time=00:01:01.73 bitrate=53878.8kbits/s speed=   1x    
frame= 3707 fps= 60 q=-1.0 size=  408320kB time=00:01:02.23 bitrate=53749.2kbits/s speed=   1x    
frame= 3738 fps= 60 q=-1.0 size=  410880kB time=00:01:02.74 bitrate=53641.3kbits/s speed=   1x    
frame= 3768 fps= 60 q=-1.0 size=  413184kB time=00:01:03.24 bitrate=53515.6kbits/s speed=   1x    
frame= 3799 fps= 60 q=-1.0 size=  415488kB time=00:01:03.76 bitrate=53378.4kbits/s speed=   1x    
frame= 3829 fps= 60 q=-1.0 size=  417792kB time=00:01:04.26 bitrate=53256.9kbits/s speed=   1x    
frame= 3859 fps= 60 q=-1.0 size=  420096kB time=00:01:04.76 bitrate=53137.1kbits/s speed=   1x    
frame= 3890 fps= 60 q=-1.0 size=  422400kB time=00:01:05.28 bitrate=53006.0kbits/s speed=   1x    
frame= 3920 fps= 60 q=-1.0 size=  424704kB time=00:01:05.78 bitrate=52890.1kbits/s speed=   1x    
frame= 3922 fps= 60 q=-1.0 Lsize=  425098kB time=00:01:05.81 bitrate=52913.4kbits/s speed=   1x    
video:425055kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.010058%
Exiting normally, received signal 2.


  


  in my opinion this shouldn't be much of a problem but when i play back the file it has some pretty good "cuts" in there as if the video skips for half of a second. But on a framerate of 60 there must have been a framedrop of 30 frames to achieve this or am i wrong ?

  


  my record script :

  


  ffmpeg -r 60 -loglevel quiet -an -i /dev/video0 -preset ultrafast -vcodec copy test.mp4


  


  is there a way to "smoothen" the loss of frames as seen in the logfile ?

  


  or is there a way to determine what causes the framedrops ? If it is ffmpeg, heavy CPU load or the capture device itself ?

  


  thanks a lot cheers Rudi