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• use OpenCV to capture a good frame of faces from IP camera [on hold]

  17 octobre 2018, par wiwengweng

  everyone. I am working on some research about getting frames from IP camera, and then detect and recognize faces. There is some implements on the last two steps. And my first problem is to judge if a frame with faces is good enough for detection. Video stream is read by OpenCV and/or ffmpeg, and there are many ways to capture frames one by one.

  As we know, people are always walking through, so frames captured from IP camera is not always good. But the good news is the if we extract the frames from the IP camera video file, we find some frames good enough for detection.

  is it possible to analyse by using the opencv CascadeClassifier to detect if the face is clear or not ? Right now I just use minSize and maxSize to capture the face, however I cannot judge if it is clear.

  I also try de-blurring pictures of frames using GAN, but that will need more time, so I think that is not an ideal way. So any advice is welcome.

• cannot capture a good frame of faces from IP camera [on hold]

  16 octobre 2018, par wiwengweng

  everyone. I am working on some research about getting frames from IP camera, and then detect and recognize faces. There is some implements on the last two steps. And my first problem is to judge if a frame with faces is good enough for detection. Video stream is read by OpenCV and/or ffmpeg, and there are many ways to capture frames one by one.

  As we know, people are always walking through, so frames captured from IP camera is not always good. But the good news is the if we extract the frames from the IP camera video file, we find some frames good enough for detection.

  I also try de-blurring pictures of frames using GAN, but that will need more time, so I think that is not an ideal way. So any advice is welcome.

• FFMpeg - add background music

  22 août 2018, par jacky brown

  here is what i have :
  input1.avi - video that contain sounds.
  input2.avi - video that doesn’t contain sounds.
  music.mp3 - audio file.

  i want to add background music(music.mp3 file) to the video.

  C:\input1.avi -i C:\music.mp3 -shortest -c:v copy -c:a copy C:\output1.avi

  then output1.avi is the same as input1 - movie with sounds but without the background music (music.mp3)

  when i try to use the other file (video without sounds) :

  C:\input2.avi -i C:\music.mp3 -shortest -c:v copy -c:a copy C:\output2.avi

  then output2.avi is the same as input2 + it have the background music.

  so why input1 does not contain the background music ???
  and how can i decrease or increase the volume of music.mp3 file ?

  thanks.

  ---

  console output :

  C:\motionbee\ffmpeg\bin>ffmpeg -i C:\input.avi
  
  -i C:\music.mp3 -shortest -c:v copy -filter_
  
  complex "[0:a]aformat=fltp:44100:stereo[0a];[1]aformat=fltp:44100:stereo,volume=
  
  1.5[1a];[0a][1a]amix[a]" -map 0:v -map "[a]" -ac 2 C:\output1.avi
  
  ffmpeg version N-78949-g6f5048f Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
  
  enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
  
  ibilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopenc
  
  ore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --ena
  
  ble-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable
  
  -libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --ena
  
  ble-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx
  
  264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable
  
  -lzma --enable-decklink --enable-zlib
  
    libavutil      55. 19.100 / 55. 19.100
  
    libavcodec     57. 27.101 / 57. 27.101
  
    libavformat    57. 28.100 / 57. 28.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 39.100 /  6. 39.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, avi, from 'C:\input.avi':
  
    Metadata:
  
      encoder         : Lavf57.28.100
  
    Duration: 00:02:05.76, start: 0.000000, bitrate: 450 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (XVID / 0x44495658), yuv420p, 720
  
  x480 [SAR 1:1 DAR 3:2], 440 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 128 k
  
  b/s
  
  [mp3 @ 00000000005c8020] Skipping 0 bytes of junk at 32370.
  
  Input #1, mp3, from 'C:\music.mp3':
  
    Metadata:
  
      title           : Broadcast News Package - News Intro
  
      artist          : After Effects News Template
  
    Duration: 00:01:57.89, start: 0.025057, bitrate: 194 kb/s
  
      Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
  
      Metadata:
  
        encoder         : Lavc56.26
  
  File 'C:\output1.avi' already exists. Overwrite
  
  ? [y/N] y
  
  Output #0, avi, to 'C:\output1.avi':
  
    Metadata:
  
      ISFT            : Lavf57.28.100
  
      Stream #0:0: Video: mpeg4 (XVID / 0x44495658), yuv420p, 720x480 [SAR 1:1 DAR
  
   3:2], q=2-31, 440 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
      Stream #0:1: Audio: mp3 (libmp3lame) (U[0][0][0] / 0x0055), 44100 Hz, stereo
  
  , fltp (default)
  
      Metadata:
  
        encoder         : Lavc57.27.101 libmp3lame
  
  Stream mapping:
  
    Stream #0:1 (mp3) -> aformat
  
    Stream #1:0 (mp3) -> aformat
  
    Stream #0:0 -> #0:0 (copy)
  
    amix -> Stream #0:1 (libmp3lame)
  
  Press [q] to stop, [?] for help
  
  frame= 3118 fps=0.0 q=-1.0 Lsize=    6917kB time=00:02:05.76 bitrate= 450.6kbits
  
  /s speed= 867x
  
  video:6754kB audio:74kB subtitle:0kB other streams:0kB global headers:0kB muxing
  
   overhead: 1.307944%