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• How do I crossfade between scenes in ffmpeg using a complex filter ?

  15 mars 2014, par scubed

  I have ffmpeg 2.1.4 and an input movie in.mkv.
  There are effectively 2 different scenes inside of in.mkv. I want to be able to crossfade between the scenes, preferably with just using a complex filter instead of external programs. Essentially, I want to have something like an overlay but with the alpha changing at a specific time.

  Consider if in.mkv looked like this :

  00:00 - 00:05 scene 1
  
  00:05 - 00:10 junk
  
  00:10 - 00:15 scene 2

  So, I would want an output that had :

  00:00 - 00:04 scene 1 (0-4)
  
  00:04 - 00:05 alpha fading between scene 1 (4-5) and 2 (10-11)
  
  00:05 - 00:09 scene 2 (11-15)

  I see that there's a filter for : overlay, alphamerge, and color, but it's not clear how exactly to do this.

  In general, it seems hard to work with pieces of a movie file in ffmpeg. Is there a way to say that I am taking various pieces of the same input file and putting them together without rendering them as separate movies first ?

• add image to mov using ffmpeg

  23 juin 2012, par knishua

  i have seen this code on this link

  http://www.catswhocode.com/blog/19-ffmpeg-commands-for-all-needs

  " Mix a video with a sound file

  ffmpeg -i son.wav -i video_origine.avi video_finale.mpg "

  is it possible to add a seperate image ( created using ffmpeg and ) to a mov , say

  ffmpeg -threads 8 -i D:\imagesequence\dpx\brn_055.%04d.dpx  D:\imagesequence\dpx\test2.mov

  makes a movie, then is it possible to add an image (D:/imagesequence/dpx/final_with_text_mod_04.jpg) to the beginning of this mov using one ffmpeg command

  ffmpeg -i D:/imagesequence/background.jpg -vf "movie='D\:/imagesequence/dpx/thumbnail.jpg' [watermark]; [in][watermark] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/3 [out]" D:/imagesequence/dpx/final_with_text_mod_04.jpg

• How to take a video of what's happening in selenium

  5 février 2019, par fabio

  I’m using Selenium 3 webdriver and Python 3 in Windows 7.

  I want to record a video of what’s happening in my selenium tests.

  To do so I’m using FFmpeg and screen-capture-recorder but I can change programs.

  Here’s my code :

  import unittest
  
  from selenium import webdriver
  
  from subprocess import Popen
  
  #from subprocess import call
  
  
  
  
  
  cmd = 'ffmpeg -y -rtbufsize 2000M -f dshow -i video="screen-capture-recorder" -r 10 -t 20 screen-capture.mp4'
  
  
  
  class SearchProductTest(unittest.TestCase):
  
      def setUp(self):
  
  
  
          # start the recording of movie
  
          self.videoRecording = Popen(cmd)
  
  
  
          # create a new Firefox session
  
          self.driver = webdriver.Firefox()
  
          self.driver.implicitly_wait(30)
  
          self.driver.maximize_window()
  
  
  
          # navigate to the application home page
  
          self.driver.get("http://demo-store.seleniumacademy.com/")
  
  
  
      def test_search_by_category(self):
  
          # get the search textbox
  
          search_field = self.driver.find_element_by_name("q")
  
          search_field.clear()
  
  
  
          # enter search keyword and submit
  
          search_field.send_keys("phones")
  
          search_field.submit()
  
  
  
          # get all the anchor elements which have product names displayed
  
          # currently on result page using find_elements_by_xpath method
  
          products = self.driver.find_elements_by_xpath(
  
              "//h2[@class='product-name']/a")
  
  
  
          # check count of products shown in results
  
          self.assertEqual(3, len(products))
  
          #self.videoRecording.terminate()
  
  
  
      def test_something_else(self):
  
          pass
  
  
  
      def tearDown(self):
  
          # close the browser window
  
          self.driver.quit()
  
  
  
          # Stop the recording
  
          self.videoRecording.terminate()
  
  
  
      #def terminate(process):
  
          #if process.poll() is None:
  
          #    call('taskkill /F /T /PID ' + str(process.pid))
  
  
  
  if __name__ == '__main__':
  
      unittest.main(verbosity=2)

  The problems are :

  1) the cmd gives a max time per the movie (20" in the example). If the test last more the movie is created and it works (but is incomplete, only 20").

  2) if the test last less the file is created but it doesn’t work (the reader can’t read it and it’s just some bytes). This is the main error ! I’m not sure about where to start the movie and where (and how) to stop it.

  3) If I have more than one test I would like to have only one movie for all of them (so I want to record all the tests in the same movie).

  4) if possible I would prefer to record the webdriver window (the one where my tests are running) and not my screen so meanwhile the tests go I can do something else (they are slow).

  Thanks you for the help.