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• Matomo’s privacy-friendly web analytics software named best of the year 2022

  25 janvier 2023, par Erin

  W3Tech names Matomo ‘Traffic Analysis Tool of the Year 2022’ in its Web Technologies of the Year list of technologies that gained the most sites

  Matomo, a world-leading open-source web analytics platform, is proud to announce that it has received W3Tech’s award for the best web analytics software in its Web Technologies of the Year 2022. Matomo is the first independent, open-source tool named Traffic Analysis Tool of the Year – with previous winners including Google Analytics and Facebook Pixel.


  W3Tech, a trusted source for web technology research, determines winners for its annual Web Technologies of the Year list by technologies that gained the most websites. W3Tech surveys usage across millions of websites globally – comparing the number of sites using a technology on January 1st of one year with the number of sites using it the following year.

  W3Tech commenting on the Traffic Analysis Tool winners, said : “Matomo, the privacy-focused open source analytics platform, is the traffic analysis tool of the year for the first time, while Google Analytics and the other previous winners all lost a bit of market share in 2022. The Chinese Baidu Analytics ranks second this year. Snowplow, another open source tool, is an unexpected third.”


  Matomo launched in 2007 as an open-source analytics alternative to Google Analytics, keeps businesses GDPR and CCPA-compliant. Matomo is trusted by over 1.4 million websites in 220 countries and is translated into over 50 languages.


  Matomo founder Matthieu Aubry says, “As the first independent, open-source traffic analysis tool to receive this recognition, Matomo is humbled and honoured to lead the charge for change. It’s a testament to the hard work of our community, and it’s a clear sign that consumers and organisations are looking for ethical alternatives.


  “This recognition is a major win for the entire privacy movement and proves that the tide is turning against the big tech players who I believe have long prioritised profits over privacy. We are committed to continuing our work towards a more private and secure digital landscape for all.”


  In W3Tech’s Web Technologies of the Year 2022, Matomo was also judged third Tag Manager, behind Google Tag Manager and Adobe DTM.


  Matomo helps businesses and organisations track and optimise their online presence allowing users to easily collect, analyse, and act on their website and marketing data to gain a deeper understanding of their visitors and drive conversions and revenue. With 100% data ownership, customers using the company’s tools get the power to protect their website user’s privacy – and where their data is stored and what’s happening to it, without external influence. Furthermore, as the data is not sampled, it maintains data accuracy. 


  Aubry says its recent award is a positive reminder of how well this solution is performing internationally and is a testament to the exceptional quality and performance of Matomo’s powerful web analytics tools that respect a user’s privacy.


  “In 2020, the CJEU ruled US cloud servers don’t comply with GDPR. Then in 2022, the Austrian Data Protection Authority and French Data Protection Authority (CNIL) ruled that the use of Google Analytics is illegal due to data transfers to the US. With Matomo Cloud, the customer’s data is stored in Europe, and no data is transferred to the US. On the other hand, with Matomo On-Premise, the data is stored in your country of choice.


  “Matomo has also become one of the most popular open-source alternatives to Google Analytics for website owners and marketing teams because it empowers web professionals to make business decisions. Website investment, collateral, and arrangement are enriched by having the full picture and control of the data.”

  

  About Matomo

  Matomo is a world-leading open-source web analytics platform, trusted by over 1.4 million websites in 220 countries and translated into over 50 languages. Matomo helps businesses and organisations track and optimise their online presence allowing users to easily collect, analyse, and act on their website and marketing data to gain a deeper understanding of their visitors and drive conversions and revenue. Matomo’s vision is to create, as a community, the leading open digital analytics platform that gives every user complete control of their data.

  For more information/ press enquiries Press – Matomo

• VideoWriter Doesn't work using openCV, ubuntu, Qt

  25 janvier 2023, par underflow223

  My code :

  


  cv::VideoWriter(
  strFile.toStdString(),
  cv::VideoWriter::fourcc('m','p','4','v'),
  nfps,
  cv::Size(1920/nresize, 1080/nresize)
);


  


  Error message :

  


  [mpeg4_v4l2m2m @ 0x7f50a43c50] arm_release_ver of this libmali is 'g6p0-01eac0', rk_so_ver is '7'.
Could not find a valid device
[mpeg4_v4l2m2m @ 0x7f50a43c50] can't configure encoder


  


  If I use MJPG codec, it works fine thow.

  


  This is OPENCV configure info :

  


  -- General configuration for OpenCV 4.6.0 =====================================
--   Version control:               unknown
-- 
--   Extra modules:
--     Location (extra):            /home/firefly/Downloads/opencv_contrib-4.6.0/modules
--     Version control (extra):     unknown
-- 
--   Platform:
--     Timestamp:                   2023-01-19T02:11:26Z
--     Host:                        Linux 5.10.110 aarch64
--     CMake:                       3.16.3
--     CMake generator:             Unix Makefiles
--     CMake build tool:            /usr/bin/make
--     Configuration:               Release
-- 
--   CPU/HW features:
--     Baseline:                    NEON FP16
-- 
--   C/C++:
--     Built as dynamic libs?:      YES
--     C++ standard:                11
--     C++ Compiler:                /usr/bin/c++  (ver 9.4.0)
--     C++ flags (Release):         -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections    -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG  -DNDEBUG
--     C++ flags (Debug):           -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections    -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
--     C Compiler:                  /usr/bin/cc
--     C flags (Release):           -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections    -fvisibility=hidden -O3 -DNDEBUG  -DNDEBUG
--     C flags (Debug):             -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections    -fvisibility=hidden -g  -O0 -DDEBUG -D_DEBUG
--     Linker flags (Release):      -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined  
--     Linker flags (Debug):        -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined  
--     ccache:                      NO
--     Precompiled headers:         NO
--     Extra dependencies:          dl m pthread rt
--     3rdparty dependencies:
-- 
--   OpenCV modules:
--     To be built:                 aruco barcode bgsegm bioinspired calib3d ccalib core datasets dnn dnn_objdetect dnn_superres dpm face features2d flann freetype fuzzy gapi hfs highgui img_hash imgcodecs imgproc intensity_transform line_descriptor mcc ml objdetect optflow phase_unwrapping photo plot quality rapid reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab wechat_qrcode xfeatures2d ximgproc xobjdetect xphoto
--     Disabled:                    world
--     Disabled by dependency:      -
--     Unavailable:                 alphamat cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv hdf java julia matlab ovis python2 python3 sfm viz
--     Applications:                tests perf_tests apps
--     Documentation:               NO
--     Non-free algorithms:         NO
-- 
--   GUI:                           GTK3
--     GTK+:                        YES (ver 3.24.20)
--       GThread :                  YES (ver 2.64.6)
--       GtkGlExt:                  NO
--     VTK support:                 NO
-- 
--   Media I/O: 
--     ZLib:                        /usr/lib/aarch64-linux-gnu/libz.so (ver 1.2.11)
--     JPEG:                        /usr/lib/aarch64-linux-gnu/libjpeg.so (ver 80)
--     WEBP:                        build (ver encoder: 0x020f)
--     PNG:                         /usr/lib/aarch64-linux-gnu/libpng.so (ver 1.6.37)
--     TIFF:                        /usr/lib/aarch64-linux-gnu/libtiff.so (ver 42 / 4.1.0)
--     JPEG 2000:                   build (ver 2.4.0)
--     OpenEXR:                     build (ver 2.3.0)
--     HDR:                         YES
--     SUNRASTER:                   YES
--     PXM:                         YES
--     PFM:                         YES
-- 
--   Video I/O:
--     DC1394:                      YES (2.2.5)
--     FFMPEG:                      YES
--       avcodec:                   YES (58.54.100)
--       avformat:                  YES (58.29.100)
--       avutil:                    YES (56.31.100)
--       swscale:                   YES (5.5.100)
--       avresample:                YES (4.0.0)
--     GStreamer:                   YES (1.16.2)
--     v4l/v4l2:                    YES (linux/videodev2.h)
-- 
--   Parallel framework:            pthreads
-- 
--   Trace:                         YES (with Intel ITT)
-- 
--   Other third-party libraries:
--     Lapack:                      NO
--     Eigen:                       NO
--     Custom HAL:                  YES (carotene (ver 0.0.1))
--     Protobuf:                    build (3.19.1)
-- 
--   OpenCL:                        YES (no extra features)
--     Include path:                /home/firefly/Downloads/opencv-4.6.0/3rdparty/include/opencl/1.2
--     Link libraries:              Dynamic load
-- 
--   Python (for build):            /usr/bin/python2.7
-- 
--   Java:                          
--     ant:                         NO
--     JNI:                         NO
--     Java wrappers:               NO
--     Java tests:                  NO
-- 
============================================================================================


  


  ffmpeg info :

  


  ============================================================================================
ffmpeg
ffmpeg version 4.2.4-1ubuntu1.0firefly5 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: --prefix=/usr --extra-version=1ubuntu1.0firefly5 --toolchain=hardened --libdir=/usr/lib/aarch64-linux-gnu --incdir=/usr/include/aarch64-linux-gnu --arch=arm64 --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-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libdrm --enable-librga --enable-rkmpp --enable-version3 --disable-libopenh264 --disable-vaapi --disable-vdpau --disable-decoder=h264_v4l2m2m --disable-decoder=vp8_v4l2m2m --disable-decoder=mpeg2_v4l2m2m --disable-decoder=mpeg4_v4l2m2m --enable-shared --disable-doc
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
====================================================================================


  


• ffmpeg realtime bad quality variable fps cams inputs to constant framerate problem

  23 janvier 2023, par BloodMan

      ../ffmpeg/ffmpeg -err_detect ignore_err -nostdin -threads 0 -y -strict experimental -thread_queue_size 10M -max_delay 20M -rtbufsize 20M -fflags +discardcorrupt \
        -i "${cam1}" -i "${cam2}" -i "${cam3}" -i "${cam4}" \
        -filter_complex " \
        nullsrc=size=3840x2160:rate=30 [main1]; \
        anullsrc=channel_layout=stereo:sample_rate=44100 [a]; \
        [0:v] scale=1920:1080 [overlay1]; \
        [1:v] scale=1920:1080 [overlay2]; \
        [2:v] scale=1920:1080 [overlay3]; \
        [3:v] scale=1920:1080 [overlay4]; \
        [main1][overlay1] overlay=0:0 [main2]; \
        [main2][overlay2] overlay=1920:0 [main3]; \
        [main3][overlay3] overlay=0:1080 [main4]; \
        [main4][overlay4] overlay=1920:1080 [v] " \
        -t 10 -r 30 -g 60 -map "[v]" -map "[a]" \
        -shortest -video_size 3840x2160 -pix_fmt yuv420p -vcodec libx264 -preset ultrafast -tune zerolatency -minrate 2M -maxrate 2M -bufsize 20M -c:a aac -b:a 96k -ac 2 -ar 48000 -copytb 1 \
        -f flv -y -fflags +genpts rtmp://b.rtmp.youtube.com/live2/${key}?backup=1


  


  ffmpeg version N-109650-g9d5e66942c Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 10 (Debian 10.2.1-6)
  configuration: --prefix=/home/bloodman/ffmpeg --pkg-config-flags=--static --extra-cflags='-I/home/bloodman/ffmpeg/include -march=native' --extra-ldflags=-L/home/bloodman/ffmpeg/lib --extra-libs='-lpthread -lm' --bindir=/home/bloodman/ffmpeg --enable-gpl --enable-nonfree --enable-libx264 --enable-libfdk-aac --enable-libmp3lame --enable-libfreetype --enable-hardcoded-tables
  libavutil      57. 44.100 / 57. 44.100
  libavcodec     59. 56.100 / 59. 56.100
  libavformat    59. 35.100 / 59. 35.100
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 54.100 /  8. 54.100
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
  libpostproc    56.  7.100 / 56.  7.100
[hls @ 0x56019db77780] Skip ('#EXT-X-VERSION:3')
[hls @ 0x56019db77780] Opening 'cams/stream1_113.ts' for reading
Input #0, hls, from 'cams/stream1.m3u8':
  Duration: N/A, start: 1122.341667, bitrate: N/A
  Program 0
    Metadata:
      variant_bitrate : 0
  Stream #0:0: Video: h264 (Baseline) ([27][0][0][0] / 0x001B), yuv420p, 2048x1536, 15 fps, 15 tbr, 90k tbn
    Metadata:
      variant_bitrate : 0
[hls @ 0x56019db9e980] Skip ('#EXT-X-VERSION:3')
[hls @ 0x56019db9e980] Opening 'cams/stream2_105.ts' for reading
Input #1, hls, from 'cams/stream2.m3u8':
  Duration: N/A, start: 1042.633000, bitrate: N/A
  Program 0
    Metadata:
      variant_bitrate : 0
  Stream #1:0: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuvj420p(pc, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 100 tbr, 90k tbn
    Metadata:
      variant_bitrate : 0
[hls @ 0x56019dccdbc0] Skip ('#EXT-X-VERSION:3')
[hls @ 0x56019dccdbc0] Opening 'cams/stream3_14.ts' for reading
Input #2, hls, from 'cams/stream3.m3u8':
  Duration: N/A, start: 132.469000, bitrate: N/A
  Program 0
    Metadata:
      variant_bitrate : 0
  Stream #2:0: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 2688x1520, 25 fps, 100 tbr, 90k tbn
    Metadata:
      variant_bitrate : 0
[hls @ 0x56019f0ec980] Skip ('#EXT-X-VERSION:3')
[hls @ 0x56019f0ec980] Opening 'cams/stream4_26.ts' for reading
Input #3, hls, from 'cams/stream4.m3u8':
  Duration: N/A, start: 253.389000, bitrate: N/A
  Program 0
    Metadata:
      variant_bitrate : 0
  Stream #3:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuvj420p(pc, bt709), 1920x1080, 90k tbr, 90k tbn
    Metadata:
      variant_bitrate : 0
Stream mapping:
  Stream #0:0 (h264) -> scale:default
  Stream #1:0 (h264) -> scale:default
  Stream #2:0 (h264) -> scale:default
  Stream #3:0 (h264) -> scale:default
  overlay:default -> Stream #0:0 (libx264)
  anullsrc:default -> Stream #0:1 (aac)
[hls @ 0x56019db77780] Opening 'cams/stream1_114.ts' for reading
[hls @ 0x56019db77780] Opening 'cams/stream1_115.ts' for reading
[swscaler @ 0x5601a2c78e40] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x5601a332c940] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x5601a2c78e40] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 2 times
[swscaler @ 0x5601a332c940] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x5601a361fc00] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 1 times
[libx264 @ 0x56019e5212c0] using SAR=1/1
[libx264 @ 0x56019e5212c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x56019e5212c0] profile Constrained Baseline, level 5.1, 4:2:0, 8-bit
[libx264 @ 0x56019e5212c0] 264 - core 160 r3011 cde9a93 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=8 lookahead_threads=8 sliced_threads=1 slices=8 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=60 keyint_min=6 scenecut=0 intra_refresh=0 rc_lookahead=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=2000 vbv_bufsize=20000 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=0
Output #0, flv, to 'rtmp://b.rtmp.youtube.com/live2/XXXX-XXXX-XXXX-XXXX-XXXX?backup=1':
  Metadata:
    encoder         : Lavf59.35.100
  Stream #0:0: Video: h264 ([7][0][0][0] / 0x0007), yuv420p(progressive), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 30 fps, 1k tbn
    Metadata:
      encoder         : Lavc59.56.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 2000000/0/0 buffer size: 20000000 vbv_delay: N/A
  Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 48000 Hz, stereo, fltp, 96 kb/s
    Metadata:
      encoder         : Lavc59.56.100 aac
[hls @ 0x56019db77780] Skip ('#EXT-X-VERSION:3')00:00:03.22 bitrate=7519.6kbits/s speed=0.359x
[hls @ 0x56019db77780] Opening 'cams/stream1_116.ts' for reading
[hls @ 0x56019db77780] Skip ('#EXT-X-VERSION:3')00:00:07.23 bitrate=4470.2kbits/s speed=0.383x
[hls @ 0x56019db77780] Opening 'cams/stream1_117.ts' for reading
[hls @ 0x56019f0ec980] Skip ('#EXT-X-VERSION:3')00:00:09.04 bitrate=3978.1kbits/s speed=0.384x
[hls @ 0x56019f0ec980] Opening 'cams/stream4_27.ts' for reading
[hls @ 0x56019dccdbc0] Skip ('#EXT-X-VERSION:3')
[hls @ 0x56019dccdbc0] Opening 'cams/stream3_15.ts' for reading
[hls @ 0x56019db9e980] Skip ('#EXT-X-VERSION:3')
[hls @ 0x56019db9e980] Opening 'cams/stream2_106.ts' for reading
[flv @ 0x56019e639a00] Failed to update header with correct duration.811.6kbits/s speed=0.385x
[flv @ 0x56019e639a00] Failed to update header with correct filesize.
frame=  299 fps= 12 q=34.0 Lsize=    4622kB time=00:00:09.98 bitrate=3792.7kbits/s speed=0.386x
video:4603kB audio:3kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.349536%
[libx264 @ 0x56019e5212c0] frame I:5     Avg QP:45.60  size:275880
[libx264 @ 0x56019e5212c0] frame P:294   Avg QP:38.77  size: 11340
[libx264 @ 0x56019e5212c0] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0x56019e5212c0] mb P  I16..4:  1.4%  0.0%  0.0%  P16..4:  4.7%  0.0%  0.0%  0.0%  0.0%    skip:93.9%
[libx264 @ 0x56019e5212c0] coded y,uvDC,uvAC intra: 16.2% 8.9% 1.2% inter: 1.8% 0.6% 0.0%
[libx264 @ 0x56019e5212c0] i16 v,h,dc,p: 64% 17% 15%  5%
[libx264 @ 0x56019e5212c0] i8c dc,h,v,p: 90%  6%  3%  1%
[libx264 @ 0x56019e5212c0] kb/s:3783.23
[aac @ 0x56019e63a700] Qavg: 65511.207
[hls @ 0x56019db77780] Skip ('#EXT-X-VERSION:3')
[hls @ 0x56019db77780] Opening 'cams/stream1_118.ts' for reading


  


  NOTES : sources are cams streamed first to hls/m3u8. -t 10 only for testing purposes.

  


  The problem is variable output fps= 12 (sometimes 2, 5, 10, maybe 13) where I expect 30. Machine is 10 times greater (encode uses up to 5% cpu).

  


  Im trying adding -re, -r 30, -r 15 to sources, convert sources via stream_filter (,fps=30), vsync (old versions of ffmpeg), wallclock time, etc. and reading stackoverflow of course. And... nothing.

  


  Where is the problem ?