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• avformat/webmdashenc : Don't pass NULL to memcmp

  23 septembre 2019, par Andreas Rheinhardt

  avformat/webmdashenc : Don't pass NULL to memcmp
  Affects the FATE-tests webm-dash-manifest-unaligned-video-streams,
  
  webm-dash-manifest and webm-dash-manifest-representations.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/webmdashenc.c

• 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.

• FFMpeg sws_scale Static and Shared Huge Performance Difference

  6 novembre 2018, par Ali

  I used swscale in my code as a shared library then managed to compile FFMpeg (4.1) to static libraries with Visual Studio with this command just to get swscale :

  ./configure --toolchain=msvc --arch=x86_32 --disable-everything --disable-programs 

  I have nasm and yasm installed. this my config output :

  install prefix            /usr/local
  
  source path               .
  
  C compiler                cl
  
  C library                 msvcrt
  
  ARCH                      x86 (generic)
  
  big-endian                no
  
  runtime cpu detection     yes
  
  standalone assembly       yes
  
  x86 assembler             nasm
  
  MMX enabled               yes
  
  MMXEXT enabled            yes
  
  3DNow! enabled            yes
  
  3DNow! extended enabled   yes
  
  SSE enabled               yes
  
  SSSE3 enabled             yes
  
  AESNI enabled             yes
  
  AVX enabled               yes
  
  AVX2 enabled              yes
  
  AVX-512 enabled           yes
  
  XOP enabled               yes
  
  FMA3 enabled              yes
  
  FMA4 enabled              yes
  
  i686 features enabled     yes
  
  CMOV is fast              no
  
  EBX available             no
  
  EBP available             no
  
  debug symbols             yes
  
  strip symbols             no
  
  optimize for size         no
  
  optimizations             yes
  
  static                    yes
  
  shared                    no
  
  postprocessing support    no
  
  network support           yes
  
  threading support         w32threads
  
  safe bitstream reader     yes
  
  texi2html enabled         no
  
  perl enabled              no
  
  pod2man enabled           no
  
  makeinfo enabled          no
  
  makeinfo supports HTML    no
  
  
  
  External libraries:
  
  schannel
  
  
  
  External libraries providing hardware acceleration:
  
  d3d11va                    dxva2
  
  
  
  Libraries:
  
  avcodec                    avdevice                   avfilter                   avformat                   avutil                     swresample                 swscale
  
  
  
  Programs:
  
  Enabled decoders:
  
  Enabled encoders:
  
  Enabled hwaccels:
  
  Enabled parsers:
  
  Enabled demuxers:
  
  Enabled muxers:
  
  Enabled protocols:
  
  Enabled filters:
  
  Enabled bsfs:
  
  null
  
  Enabled indevs:
  
  Enabled outdevs:

  This compiled successfully and I replaced the lib files with .a file in QT :

  INCLUDEPATH += $$PWD/ffmpeg/inc/
  
  LIBS += $$files($$PWD/ffmpeg/lib/*.a, true)

  I didn’t change anything else. EXE works correctly without dependency but problem is static swscale is so much slower than the shared one. For 1080p share .DLL takes 2ms to shrink and convert yuv to rgb and static .A takes 6ms to

  I also tried removing --disable-everything --disable-programs but still the same. I want to know if it’s because of the cl compiler or I missed a library or a setting ?

  BTW this my system : Win10/i7 4820K/16GB/GTX970

  EDIT :

  I got this in app output :
  No accelerated colorspace conversion found from yuv420p to bgra.
  Although x86 folder in swscale is compiled, it seems it’s not linked in the output.