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• Solution for VB6 to broadcast Webcam

  14 septembre 2018, par vantrung -cuncon

  Sorry, I know VB6 is decades ago, but I’m in a situation that I have to use VB6 to deliver live webcam stream beetween 2 PC in Server - Client Model program. Vb6-code holds the connection then I have no choice but to transfer all data via that connection.

  I’ve tried weeks for this, uncountable approaches but went to nowhere.
  My efforts focused on 3 major approaches :

  1/ Use ffmpeg to record live webcam as ".avi" file on hard disk, transfer parts of file to other end & play it. But I’ve stucked with a media-player that can play a "being written" avi file.

  Windows Media Player control told me "file already in use..." & VLC Plugin can’t even be added to VB6 (axvlc.dll).

  2/ Use ffmpeg to save live webcam as avi file, transfer each bit of that file to the other end, then in other end, extract 24 images / second from the avi to display continously in a picture box.
  This approach is ok except that my hard disk get fulled of images in a time of wink and my program get very slow before hanging.

  3/ Use ffmpeg to stream the live webcam to a rtp-port like this :

  ffmpeg -f dshow -i video="Lenovo EasyCamera" -vcodec mpeg2video -pix_fmt yuv422p -f rtp -an rtp://224.1.2.3:8191

  I’ve successfully watch the stream in VLC, but VLC(axvlc.dll) refused to be integrated into ancient VB6. And more important, I don’t know how to redirect/reroute the rtp stream to other PC with VB6.

  Any one please light me up ? (Any 3rd party component is welcomed)

• Circular Overlay of Video on Another Video using FFMPEG in Android

  4 novembre 2018, par kdblue

  I am trying to overlay Second videos(on Circle) on First video. I tried but i am getting glitches in Video !

  My Command is

  command = "-i " + this.video1Path.getPath() + " -i " + this.video2Path.getPath() + " -filter_complex [1]trim=end_frame=1,geq=lum_expr='st(3,pow(X-(W/2),2)+pow(Y-(H/2),2));if(lte(ld(3),"
+ (this.mZoomLayout.getZoomedWidth()/2) + "*" + (this.mZoomLayout.getZoomedWidth()/2) + "),255,0)':128:128,format=gray,loop=-1:1,setpts=N/FRAME_RATE/TB[mask];[1][mask]alphamerge,format=rgba,lutrgb=a=if(gte(val\\,16)\\,val)[cutout];[0][cutout]overlay="
+ this.mZoomLayout.getCircleX() + ":" + this.mZoomLayout.getCircleY() + ":enable='between(t,0," + this.videoTwoDuration + ") -c:v libx264 -crf 24 -preset ultrafast " + videoPath.getPath();

  Example : i want like this

  

  But i am getting glitches in Video

  

  I am using ffmpeg android library :- https://github.com/bravobit/FFmpeg-Android

  Note : I tried this links but never worked

  https://stackoverflow.com/questions/42518592/circular-movie-overlay-in-ffmpeg (getting glitches)

  FFMPEG Log

  11-04 19:56:37.505 28420-28420/app.kdblue.com.ffmpegdemo E/ffmpeg Success: ffmpeg version n4.0-39-gda39990 Copyright (c) 2000-2018 the FFmpeg developers
  
        built with gcc 4.9.x (GCC) 20150123 (prerelease)
  
        configuration: --target-os=linux --cross-prefix=/root/bravobit/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/root/bravobit/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-ffprobe --enable-libopus --enable-libvorbis --enable-libfdk-aac --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-libvpx --enable-libass --enable-yasm --enable-pthreads --disable-debug --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-linux-perf --disable-doc --disable-shared --enable-static --enable-runtime-cpudetect --enable-nonfree --enable-network --enable-avresample --enable-avformat --enable-avcodec --enable-indev=lavfi --enable-hwaccels --enable-ffmpeg --enable-zlib --enable-gpl --enable-small --enable-nonfree --pkg-config=pkg-config --pkg-config-flags=--static --prefix=/root/bravobit/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/root/bravobit/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/root/bravobit/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-cxxflags=
  
        libavutil      56. 14.100 / 56. 14.100
  
        libavcodec     58. 18.100 / 58. 18.100
  
        libavformat    58. 12.100 / 58. 12.100
  
        libavdevice    58.  3.100 / 58.  3.100
  
        libavfilter     7. 16.100 /  7. 16.100
  
        libavresample   4.  0.  0 /  4.  0.  0
  
        libswscale      5.  1.100 /  5.  1.100
  
        libswresample   3.  1.100 /  3.  1.100
  
        libpostproc    55.  1.100 / 55.  1.100
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/MixVideos/video1_1541341464579.mp4':
  
        Metadata:
  
          major_brand     : mp42
  
          minor_version   : 0
  
          compatible_brands: isommp42
  
          creation_time   : 2018-11-04T14:24:29.000000Z
  
          com.android.version: 8.1.0
  
          com.android.manufacturer: OnePlus
  
          com.android.model: ONE A2003
  
        Duration: 00:00:04.15, start: 0.000000, bitrate: 9983 kb/s
  
          Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 9978 kb/s, SAR 1:1 DAR 16:9, 29.39 fps, 30 tbr, 90k tbn, 180k tbc (default)
  
          Metadata:
  
            rotate          : 90
  
            creation_time   : 2018-11-04T14:24:29.000000Z
  
            handler_name    : VideoHandle
  
          Side data:
  
            displaymatrix: rotation of -90.00 degrees
  
      Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/MixVideos/video2_1541341478507.mp4':
  
        Metadata:
  
          major_brand     : mp42
  
          minor_version   : 0
  
          compatible_brands: isommp42
  
          creation_time   : 2018-11-04T14:24:42.000000Z
  
          com.android.version: 8.1.0
  
          com.android.manufacturer: OnePlus
  
          com.android.model: ONE A2003
  
        Duration: 00:00:02.62, start: 0.000000, bitrate: 9833 kb/s
  
          Stream #1:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 9824 kb/s, SAR 1:1 DAR 16:9, 29.73 fps, 30 tbr, 90k tbn, 180k tbc (default)
  
          Metadata:
  
            rotate          : 90
  
            creation_time   : 2018-11-04T14:24:42.000000Z
  
            handler_name    : VideoHandle
  
          Side data:
  
            displaymatrix: rotation of -90.00 degrees
  
      Stream mapping:
  
        Stream #0:0 (h264) -> overlay:main
  
        Stream #1:0 (h264) -> trim
  
        Stream #1:0 (h264) -> alphamerge:main
  
        overlay -> Stream #0:0 (libx264)
  
      Press [q] to stop, [?] for help
  
      [swscaler @ 0xed8a7000] No accelerated colorspace conversion found from yuv420p to rgba.
  
      [libx264 @ 0xf2016c00] using SAR=1/1
  
      [libx264 @ 0xf2016c00] using cpu capabilities: ARMv6 NEON
  
      [libx264 @ 0xf2016c00] profile Constrained Baseline, level 4.0
  
      [libx264 @ 0xf2016c00] 264 - core 152 r2851M ba24899 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=12 lo

• libvpxenc,vp9 : add enable-tpl option

  3 novembre 2018, par James Zern

  libvpxenc,vp9 : add enable-tpl option
  enables temporal dependency model
  Signed-off-by : James Zern <jzern@google.com>
  

  • [DH] doc/encoders.texi
  • [DH] libavcodec/libvpxenc.c