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• gdigrab : Fix hwnd parameter issues

  18 décembre 2023, par Martin Storsjö

  gdigrab : Fix hwnd parameter issues
  Converting from an integer to HWND (which is a pointer) requires
  
  an explicit cast, otherwise Clang errors out like this :
      src/libavdevice/gdigrab.c:280:14 : error : incompatible integer to pointer conversion assigning to 'HWND' (aka 'struct HWND__ *') from 'long' [-Wint-conversion]
  
        280 |         hwnd = strtol(name, &p, 0) ;
  
            |              ^ 
  (With GCC and MSVC, this was a mere warning, but with recent Clang,
  
  this is an error.)
  After adding a cast, all compilers also warn something like this :
      src/libavdevice/gdigrab.c:280:16 : warning : cast to 'HWND' (aka 'struct HWND__ *') from smaller integer type 'long' [-Wint-to-pointer-cast]
  
        280 |         hwnd = (HWND) strtol(name, &p, 0) ;
  
            |                ^ 
  On Windows, long types are 32 bit, so to get a usable pointer, we
  
  need to use long long. And interpret it as unsigned long long
  
  while at it - i.e. using strtoull.
  Finally, right above it, the code triggered the following warning :
      src/libavdevice/gdigrab.c:278:15 : warning : mixing declarations and code is incompatible with standards before C99 [-Wdeclaration-after-statement]
  
        278 |         char *p ;
  
            |               ^
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavdevice/gdigrab.c

• TypeError : 'function' object is not subscriptable Python with ffmpeg

  25 novembre 2019, par S1mple

  clips = []
  
  
  
  def clipFinder(CurrentDir, fileType):
  
      clips.clear()
  
      for r,d,f in os.walk(CurrentDir):
  
          for file in f:
  
              if fileType in file:
  
                  clips.append(r+file)
  
      random.shuffle(clips)
  
  
  
  def removeVods(r):
  
      for f in clips:
  
          if 'vod' in clips:
  
              os.remove(r+f)
  
  
  
  def clipString():
  
      string = 'intermediate'
  
      clipList = []
  
      clipNum = 1
  
      for f in clips:
  
          clipList.append(string+str(clipNum)+'.ts'+'|')
  
          clipNum+=1
  
      string1 = ''.join(clipList)
  
      string2 = string1[0:len(string1)-1]
  
      return string2
  
  
  
  def concatFiles():
  
      clipFinder('***', '.mp4')
  
      removeVods('***')
  
      i = 0
  
      intermediates = []
  
      for f in clips:
  
          subprocess.call(['***', '-i', clips[i], '-c', 'copy', '-bsf:v', 'h264_mp4toannexb', '-f', 'mpegts', 'intermediate'+ str(i+1) +'.ts'])
  
          i += 1 
  
      clipsLength = len(clips)
  
      subprocess.call['***', '-i', '"concat:' + clipString() + '"', '-c', 'copy', '-bsf:a 
  
      aac_adtstoasc', 'output.mp4']

  I am trying to make a clip concatenator, but the last subprocess call won’t run and gives me the error shown in the question.

  Problematic code :

  subprocess.call(['***', '-i', '"concat:' + clipString() + '"', '-c', 'copy', '-bsf:a aac_adtstoasc', 'output.mp4'])

  all places with * were paths such as :
  /davidscomputer/bin/ffmpeg/

• FFmpeg : How to color-key all colors except blue and white ?

  21 février 2018, par DanielNg

  I know how to colorkey a specific color from an overlay video based on the documentation from FFmpeg. Here is the code I used to colorkey the black color out of a video then overlay it with a base video keeping the audio from the overlaid video :

  "ffmpeg -i " + baseVid + " -i " + overlayVid + " -y" + ' -filter_complex "[1:v]colorkey=0x000000:0.6:0.0[ckout];[0:v][ckout]overlay=shortest=1[out]" -shortest -map 1:a -map "[out]" ' + output

  However, my problem is that the overlaid video also contains other colors such as blue, white, brown, grey, green. Even though they are only small portions compared to the black that has been removed, they make the colorkeyed overlaid video look really dirty. I want to keep only the two main colors (blue and white) and removing the rest from the overlaid video. How do I do this using FFmpeg. I tried this code but it did not work.