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• create a movie in python [closed]

  23 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

• FFMPEG : create movie from timestamped images

  28 mai 2017, par HyperDevil

  Im trying to make a small movie file from a folder with webcam images.

  They are named like this :
  00-00-38.jpg
  00-05-37.jpg
  00-10-37.jpg
  00-15-37.jpg

  H-M-S.jpg format

  Although i tried patterntype glob and simpler commands i cannot get it to work.

  This is what i tried :

  ffmpeg -r 1 -pattern_type glob -i '*.jpg' -scale=720:-1 -c:v libx264 out.mp4 
  
  (got only one image)
  
  ffmpeg -r 25 -i *.jpg -vf "scale=720:-1" output.mp4
  
  (same size as a jpg file but no video)

  Console output :

  ffmpeg -framerate 1 -pattern_type glob -i "*.jpg" -vf scale=720:-1 -c:v libx264 -pix_fmt yuv420p out.mp4
  
      ffmpeg version 1.0.10 Copyright (c) 2000-2014 the FFmpeg developers  built on Jul 25 2014 07:50:40 with gcc 4.7 (Debian 4.7.2-5)
  
        configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security ' 
  
      --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis 
  
      --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-li
  
      bopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --
  
      enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --
  
      enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/x86_64
  
      -linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enabl
  
      e-libopus --enable-fontconfig --enable-libfdk-aac --enable-libdc1394 --disable-altivec --dis
  
        libavutil      51. 73.101 / 51. 73.101
  
        libavcodec     54. 59.100 / 54. 59.100
  
        libavformat    54. 29.104 / 54. 29.104
  
        libavdevice    54.  2.101 / 54.  2.101
  
        libavfilter     3. 17.100 /  3. 17.100
  
        libswscale      2.  1.101 /  2.  1.101
  
        libswresample   0. 15.100 /  0. 15.100
  
        libpostproc    52.  0.100 / 52.  0.100
  
      [image2 @ 0x1d53f00] max_analyze_duration 5000000 reached at 5000000
  
      Input #0, image2, from '*.jpg':
  
        Duration: 00:04:48.00, start: 0.000000, bitrate: N/A
  
          Stream #0:0: Video: mjpeg, yuvj420p, 800x593 [SAR 96:96 DAR 800:593], 1 fps, 1 tbr, 1 tbn, 1 tbc
  
      [libx264 @ 0x1d35bc0] using SAR=1780/1779
  
      [libx264 @ 0x1d35bc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX XOP FMA4 FMA3 SSEMisalign LZCNT BMI1
  
      [libx264 @ 0x1d35bc0] profile High, level 2.2
  
      [libx264 @ 0x1d35bc0] 264 - core 132 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options:  ca
  
      bac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dc
  
      t=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=
  
      0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 key
  
      int_min=1 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=
  
      1:1.00
  
      Output #0, mp4, to 'out.mp4':
  
        Metadata:
  
          encoder         : Lavf54.29.104
  
          Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 720x534 [SAR 1780:1779 DAR 800:593], q=-1--1, 1 tbn, 1 tbc
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (mjpeg -> libx264)
  
      Press [q] to stop, [?] for help
  
      frame=  288 fps=145 q=32763.0 Lsize=     349kB time=00:04:46.00 bitrate=  10.0kbits/s
  
      video:345kB audio:0kB subtitle:0 global headers:0kB muxing overhead 1.208469%
  
      [libx264 @ 0x1d35bc0] frame I:2     Avg QP: 2.80  size:130328
  
      [libx264 @ 0x1d35bc0] frame P:73    Avg QP: 4.70  size:  1167
  
      [libx264 @ 0x1d35bc0] frame B:213   Avg QP:17.33  size:    30
  
      [libx264 @ 0x1d35bc0] consecutive B-frames:  1.4%  0.0%  0.0% 98.6%
  
      [libx264 @ 0x1d35bc0] mb I  I16..4: 20.2% 24.9% 55.0%
  
      [libx264 @ 0x1d35bc0] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  4.3%  0.1%  0.2%  0.0%  0.0%    skip:95.5%
  
      [libx264 @ 0x1d35bc0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.8%  0.0%  0.0%  direct: 0.0%  skip:99.2%  L0: 5.4% L1:94.5% BI: 0.0
  
      %
  
      [libx264 @ 0x1d35bc0] 8x8 transform intra:24.9% inter:51.5%
  
      [libx264 @ 0x1d35bc0] coded y,uvDC,uvAC intra: 99.4% 0.0% 0.0% inter: 0.6% 0.0% 0.0%
  
      [libx264 @ 0x1d35bc0] i16 v,h,dc,p:  5% 19% 52% 25%
  
      [libx264 @ 0x1d35bc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 28% 21%  4%  6%  4%  8%  5% 15%
  
      [libx264 @ 0x1d35bc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 27% 13%  6%  8%  5%  9%  6% 12%
  
      [libx264 @ 0x1d35bc0] i8c dc,h,v,p: 100%  0%  0%  0%
  
      [libx264 @ 0x1d35bc0] Weighted P-Frames: Y:0.0% UV:0.0%
  
      [libx264 @ 0x1d35bc0] ref P L0: 98.1%  0.0%  1.7%  0.2%
  
      [libx264 @ 0x1d35bc0] ref B L0: 52.0% 48.0%
  
      [libx264 @ 0x1d35bc0] ref B L1: 73.0% 27.0%
  
      [libx264 @ 0x1d35bc0] kb/s:9.78

  The video is 364KB without any video.