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• Pygame : Frame ghosting ?

  31 décembre 2013, par Sam Tubb

  I am working on a animation environment in python using pygame. The user draw's each frame, and then using ffmpeg the animation is saved as an .avi movie. I would like to implement a feature, but am not sure how.. frame ghosting. Like display the previous frame while you draw the current.

  I tried creating a surface called ghost that copies the current frame when the next-frame key is pressed. Then draws it with an alpha level of 10, but this didn't work out correctly.

  I am not sure what to do, here is the source code for anyone that thinks they have an idea :

  #Anim8
  
  
  
  import pygame,subprocess,shutil
  
  from os import makedirs
  
  from pygame.locals import *
  
  from random import randrange
  
  pygame.init()
  
  screen=pygame.display.set_mode((740,580))
  
  draw=pygame.Surface((740,540))
  
  draw.fill((200,200,200))
  
  bcol=(200,200,200)
  
  gui=pygame.Surface((740,40))
  
  gui.fill((50,50,50))
  
  size=2
  
  color=(0,0,0)
  
  screen.fill((200,200,200))
  
  prevcol=0
  
  newcol=0
  
  f=0
  
  msg=''
  
  framerate=60
  
  try:
  
      makedirs('anim')
  
  except:
  
      pass
  
  def DrawColors(x,y):
  
      pygame.draw.rect(gui, (255,0,0), (x+3,y+3,15,15),0)
  
      pygame.draw.rect(gui, (0,0,0), (x+3,y+21,15,15),0)
  
      pygame.draw.rect(gui, (0,255,0), (x+21,y+3,15,15),0)
  
      pygame.draw.rect(gui, (200,200,200), (x+21,y+21,15,15),0)
  
      pygame.draw.rect(gui, (0,0,255), (x+39,y+3,15,15),0)
  
  while True:
  
      pygame.display.set_caption('Anim8 - Sam Tubb - '+'Frame: '+str(f)+' '+str(msg))
  
      mse=pygame.mouse.get_pos()
  
      screen.blit(gui, (0,0))
  
      DrawColors(0,0)
  
      screen.blit(draw,(0,40))
  
      key=pygame.key.get_pressed()
  
      if key[K_1]:
  
          framerate=10
  
          msg='Frame Rate set to 10'
  
      if key[K_2]:
  
          framerate=20
  
          msg='Frame Rate set to 20'
  
      if key[K_3]:
  
          framerate=30
  
          msg='Frame Rate set to 30'
  
      if key[K_4]:
  
          framerate=40
  
          msg='Frame Rate set to 40'
  
      if key[K_5]:
  
          framerate=50
  
          msg='Frame Rate set to 50'
  
      if key[K_6]:
  
          framerate=60
  
          msg='Frame Rate set to 60'
  
      if key[K_7]:
  
          framerate=70
  
          msg='Frame Rate set to 70'
  
      if key[K_8]:
  
          framerate=80
  
          msg='Frame Rate set to 80'
  
      if key[K_9]:
  
          framerate=90
  
          msg='Frame Rate set to 90'
  
      if key[K_0]:
  
          framerate=100
  
          msg='Frame Rate set to 100'
  
  
  
      if key[K_a]:
  
          pygame.image.save(draw, 'anim/frame'+str(f)+'.png')
  
          f+=1
  
      for e in pygame.event.get():
  
          if e.type==QUIT:
  
              shutil.rmtree('anim')
  
              exit()
  
          if e.type==KEYDOWN:
  
              if e.key==K_s:
  
                  msg='Added Frame!'
  
                  pygame.image.save(draw, 'anim/frame'+str(f)+'.png')
  
                  f+=1
  
              if e.key==K_c:
  
                  draw.fill(bcol)
  
              if e.key==K_r:
  
                  name='anim'+str(randrange(0,999))+str(randrange(0,999))+'.avi'
  
                  msg='Rendering: '+name
  
                  pygame.display.set_caption('Anim8 - Sam Tubb - '+'Frame: '+str(f)+' '+str(msg))
  
                  subprocess.call('ffmpeg -f image2 -s 640x480 -i anim/frame%01d.png -r '+str(framerate)+' '+name,shell=True)
  
                  msg='Done!'
  
              if e.key==K_p:
  
                  subprocess.call('ffplay '+name,shell=True)
  
          if e.type==MOUSEBUTTONDOWN:
  
              if e.button==1:
  
                  try:
  
                      prevcol=color
  
                      newcol=gui.get_at(mse)
  
                      if newcol==(50,50,50):
  
                          newcol=prevcol
  
                      color=newcol
  
                  except:
  
                      pass
  
              if e.button==3:
  
                  try:
  
                      prevcol=bcol
  
                      newcol=gui.get_at(mse)
  
                      if newcol==(50,50,50):
  
                          newcol=prevcol
  
                      draw.fill(newcol)
  
                      bcol=newcol
  
                  except:
  
                      pass
  
              if e.button==4:
  
                  size+=1
  
                  if size>7:
  
                      size=7
  
              if e.button==5:
  
                  size-=1
  
                  if size==0:
  
                      size=1 
  
          if e.type == pygame.MOUSEMOTION:
  
              lineEnd = pygame.mouse.get_pos()
  
              lineEnd = (lineEnd[0],lineEnd[1]-40)
  
              if pygame.mouse.get_pressed() == (1, 0, 0):
  
                      pygame.draw.line(draw, color, lineStart, lineEnd, size)
  
              lineStart = lineEnd
  
  
  
      pygame.display.flip()

  Oh, and on another note, just if anyone was curious, here is what the output looks like.. I made a little new year's animation :

  

• Eliminate slow speed factor in ffmpeg and image-magic commands

  24 octobre 2018, par Junaid Farooq

  The basic idea of these commands is to create a compare, (A compare has defined a jpeg from past and one from the present, combine such as they will slide on each other and show before after images.)

  e.g. https://media.evercam.io/v1/cameras/1lowe-scnoe/compares/lower-jreyh.gif

  All the commands are written below, doing these operations

  • Resize before after image.
  • create a Gif using both images.
  • Add a log to Gif.
  • Create an MP4 file of from GIF.
  • Create a thumbnail from mp4 file.

  the logo is :

  

  we are making animation and mp4 files using FFmpeg and ImageMagick commands such as

  ffmpeg -i before_image.jpg -s 1280x720 before_image_resize.jpg
  
  
  
  ffmpeg -i after_image.jpg -s 1280x720 after_image_resize.jpg

  The above commands are first to resize both images which are going to be used in animation.

  This command is being used for creating a gif.

  convert after_image_resize.jpg before_image_resize.jpg -write mpr:stack -delete 0--1 mpr:stack'[1]' \\( mpr:stack'[0]' -set delay 25 -crop 15x0 -reverse \\) mpr:stack'[0]' \\( mpr:stack'[1]' -set delay 27 -crop 15x0 \\) -set delay 2 -loop 0 temp.gif

  This command to add a logo to the animation.

  convert temp.gif -gravity SouthEast -geometry +15+15 null: evercam-logo.png -layers Composite compa-efxfphu.gif

  Then to create an mp4 file as

  ffmpeg -f gif -i compa-efxfphu.gif -pix_fmt yuv420p -c:v h264_nvenc -movflags +faststart -filter:v crop='floor(in_w/2)*2:floor(in_h/2)*2' compa-efxfphu.mp4

  then to create a thumbnail from this mp4.

  ffmpeg -i compa-efxfphu.mp4 -vframes 1 -vf scale=640:-1 -y thumb-compa-efxfphu.jpg

  Is there any possibility to reduce any of these steps ? This all takes a lot of time, I am merely interested in both convert commands, can we make them into one command ?

  Or do you see any chance to reduce these all 4 in one ? any input will be so thankful.

• Generate gif from jpeg images using ffmpeg

  3 juin 2017, par wojttaa

  I want to create a gif image from a jpeg image list, everything works fine, but how can I slow the animation ?

  Here is my code :

  <?php
  
  exec('ffmpeg -f image2 -i thumb/%001d.jpg -vf scale=480x240  out.gif');
  
  ?>