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• Processing 3, video lib : could not load movie file Ubuntu

  19 novembre 2017, par Konstantin Pashennykh

  Don’t sample code video lib processing 3.3.6 on Ubuntu 16.04. File in both folder - with sketch and data folder. Previous Install gstreamer 0.10-ffmpeg (solved previous problem with not run lib) Any your idea ?
  P.S. Work on Windows 7

  import processing.video.*;
  
  
  
  Movie mov;
  
  
  
  void setup() {
  
    size(640, 360);
  
    background(0);
  
    mov = new Movie(this, "transit.mov");
  
    mov.loop();
  
  }
  
  
  
  void movieEvent(Movie movie) {
  
    mov.read();  
  
  }
  
  
  
  void draw() {    
  
    image(mov, 0, 0);
  
  
  
    float newSpeed = map(mouseX, 0, width, 0.1, 2);
  
    mov.speed(newSpeed);
  
  
  
    fill(255);
  
    text(nfc(newSpeed, 2) + "X", 10, 30); 
  
  }

  Best Regards,
  Kos

• create a movie in python [on hold]

  22 mai 2017, par masoud

  I have some files with names (’Den_car_resample’ +’sdf’+ str(n)+’.dat’) where n changes from 0 to 25. I wrote a code to read these files and plots the results.
  now I want to create a movie from these plots. at the end of the program, I used the avconv command to do that.
  but, unfortunately my code creates a movie but it is empty.
  I don’t know the reason exactly but I think, first, I have to define a frame to each plot and then create a movie.
  can anyone please tell me how can I define a frame and also the add bit_rate of the movie.

  import sys
  
  import subprocess   
  
  import sdf
  
  import numpy as np
  
  import matplotlib.pyplot as plt  
  
  import time
  
  import matplotlib.animation as Animation
  
  from matplotlib.font_manager import FontProperties
  
  fp = FontProperties('Symbola')
  
  
  
  ##################### information from EPOCH input.deck
  
  nx,ny= 1200, 1600
  
  xmin=-100e-6
  
  xmax = 110e-6
  
  ymin = -200e-6
  
  ymax = 200e-6
  
  X =np.linspace(xmin,xmax,nx)   
  
  Y =np.linspace(ymin,ymax,ny)
  
  
  
  #################
  
  for n in range(0,25):
  
    nstr = str(n)
  
  
  
  ######################..... reading Density of carbon
  
    filename ="Den_car_resample" +'_sdf_'+ str(n)+'.dat'
  
  
  
    with open(filename, 'rb') as f:                        
  
      data = np.fromfile(f, dtype='float64', count=nx*ny)  
  
  
  
    Den_car  = np.reshape(data, [ny, nx], order='F')
  
    Den_car= np.log10(Den_car)
  
  
  
    ######################  Display Carbon density
  
  
  
    fig = plt.imshow(Den_car,  extent=[X.min()*1e6, X.max()*1e6, Y.min()*1e6,Y.max()*1e6], vmin=24, vmax=29, cmap='brg', aspect='auto') 
  
    plt.suptitle('Den_car')
  
    plt.title('sdf '+ str(n)+'; Time= '+str(n*50)+'ps',color='green', fontsize=15)
  
    plt.xlabel('x($\mu$m)')
  
    plt.ylabel('y($\mu$m)')
  
    plt.text(-80,-40,'Den_Carbon',color='red', fontsize=15)
  
    plt.colorbar()
  
    plt.savefig( 'fig%06d.png' % n, bbox_inches='tight')          
  
  
  
    plt.pause(.1)
  
    plt.clf()  
  
    plt.close()
  
  
  
    ######################  Create movie
  
  
  
    subprocess.call("avconv -framerate 1 -i fig%06d.png -c:v libx264 -profile:v high -crf 20".split())
  
  
  
  sys.exit()

• Normalize video contrast to the full dynamic range with ffmpeg ?

  18 mai 2017, par Roofus

  The following ImageMagick command line normalizes the RGB channels of an image individually, so that in each channel, the smallest value maps to 0 and the largest value maps to 255 :

  convert fish.jpg -channel all -contrast-stretch 0.003x0.003% fish2.jpg

  fish.jpg
  fish2.jpg

  Is there an ffmpeg filter which can normalize the RGB channels of every individual frame of a video ?

  The only filter I can find is "histeq", which equalizes (flattens) rather than normalizes the contrast. I have applied it per RGB channel using variations on this command line :

  ffmpeg -i fish.jpg -vf "format=rgb24,extractplanes=r+g+b[r][g][b],[r]histeq=strength=.1[r2],[g]histeq=strength=.1[g2],[b]histeq=strength=.1[b2],[g2][b2][r2]mergeplanes=0x001020:gbrp" fish3.jpg

  but since it tries to flatten the histogram, it always gives a much different (unacceptable) result ; for example, the imgur image whose code is eHL51.jpg (not enough reputation for link).

  Based on this answer :
  video normalization with ffmpeg
  I have also tested -vf "scale=out_range=full" and -vf "pp=al:f" (see the log below) but in both cases the result fish3.jpg was unchanged from fish.jpg, so apparently nothing was done.

  C:\Users\Roofus\Desktop>ffmpeg -i fish.jpg -vf scale=out_range=full -color_range 2 -pix_fmt yuvj420p fish3.jpg
  
  ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-
  
  avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libb
  
  luray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-l
  
  ibmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libope
  
  njpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enabl
  
  e-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable
  
  -libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zli
  
  b
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, image2, from 'fish.jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 3942 kb/s
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 960x540 [SAR 96:96 DAR 16:9], 25 tbr, 25 tbn, 25 t
  
  bc
  
  [swscaler @ 0000000000442f60] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, image2, to 'fish3.jpg':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc), 960x540 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 mjpeg
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  frame=    1 fps=0.0 q=2.2 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=   5x
  
  video:23kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  
  
  C:\Users\Roofus\Desktop>fish3.jpg
  
  
  
  C:\Users\Roofus\Desktop>ffmpeg -i fish.jpg -vf "pp=al:f" -color_range 2 -pix_fmt yuvj420p fish3.jpg
  
  ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-
  
  avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libb
  
  luray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-l
  
  ibmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libope
  
  njpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enabl
  
  e-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable
  
  -libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zli
  
  b
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, image2, from 'fish.jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 3942 kb/s
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 960x540 [SAR 96:96 DAR 16:9], 25 tbr, 25 tbn, 25 t
  
  bc
  
  File 'fish3.jpg' already exists. Overwrite ? [y/N] y
  
  [Parsed_pp_0 @ 0000000000321da0] This syntax is deprecated. Use '|' to separate the list items.
  
  Output #0, image2, to 'fish3.jpg':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc), 960x540 [SAR 96:96 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 mjpeg
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  frame=    1 fps=0.0 q=2.2 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=4.44x
  
  video:23kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  
  
  C:\Users\Roofus\Desktop>fish3.jpg