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• How can I simply do color interpolation on this image and then save the image ? With RGBA channels as example

  24 août 2020, par karl-police

  So I got this GIF here :

  


  

  


  As you can see, it has Red, Green and Blue in it. And it also has a full transparency in it. This was composed together with FFMPEG out of images that looked exactly like that.

  


   

  


  Then, with FFMPEG I "decomposed" the RGB and Alpha channels using the filter "extractplanes".

  


  The gallery of that, in correct order starting from up to down, can be found here :

  


  https://imgur.com/a/WN0aGuW

  


  I am not sure if this actually helps me or if I'm supposed to decompose them. Because apperantly now, after decomposing them, I'm supposed to modify them, but I'm not really sure how. It's like how do I modify the red channel that only has black and white, so all at the end, will match to the specified HEX color that I want it to be to.

  


   

  


  Now, my question is. How do I exactly make the color changing happen ? Can I do this simply with JavaScript ? Is it possible to do with FFMPEG, if possible without ImageMagicks ? Maybe a programming language where not much installation is needed to do that ?

  


  What I understood is that. These channels basically contain values from 0 to 255 with black and white. I think the "brightness" is that what 0 and 255. So something inbetween, would be like grey.

  


  So basically, like we do (255,0,0) for red. In these channels, if I want red somewhere I need to put one fully white pixel on the red channel and on all the other channels, there has to be a fully black pixel.

  


  That's the concept. Now is the question, how can I do this ?

  


   

  


  At the end I want to make it look like this one as example :

  


  

  


  This is from a game. So basically that's how it looks like in the game. And the game files only use these RGBA template sprites.

  


   

  


  I asked a similar question here : How to change colors of an image using RGBA and more channels independently of their color

  


  But somehow, I might didn't seem to explain it that well.

  


   

  


  I made a thing here to test around with things. I guess that's nearly close, but the lines are kinda weird. jsfiddle.net/qsgazubk

  


• ffmpeg prevents access to page while processing

  30 juin 2013, par Kal

  I am having trouble accessing my page after calling ffmpeg. I can't access the page until the ffmpeg finishes processing the files.

  I have a php create.php that calls videoHandler.php via ajax to create video files.

  create.php

  function createReady(){
  
   $.ajax({
  
      url: '/videoHandler',  //server script to process data
  
      type: 'POST',
  
      async: true,
  
      success: function(result) {
  
  
  
      }
  
   });
  
   window.location.href = "/create";
  
  }

  videoHandler.php

  $ffmpegpath = "c:/ffmpeg"; $input = "hd_file.mp4"; $ouput = "out_480.mp4";
  
  $exec_string = "$ffmpegpath -i $input -vcodec libx264 -b 250k -c:a libvo_aacenc -b:a 128k $output"; 
  
  $output = "out_680.mp4";
  
  $exec_string = "$ffmpegpath -i $input -vcodec libx264 -b 500k -c:a libvo_aacenc -b:a 128k $output"; 

  hd_file.mp4 size is about 500Mb

  Is there a command that forces ffmpeg to work async. or any solution to my issue ?

• Python yt-dlp and ffmpeg error "merging of multiple formats but ffmpeg is not installed"

  27 mai, par T Tea Tie

  I am using the latest version of yt-dlp with Python 3.9.

  


  I am trying to download a youtube video in mp4 format with outputname as the youtubeid.mp4 and with best resolution not more than 4K.

  


  This is my Python code :

  


  ytid = '4cDqaLxrt6Q'
url = 'https://www.youtube.com/watch?v='+ytid
output_filename = ytid+".mp4"
    
with YoutubeDL({'format': 'bestvideo[height<=?4K]+bestaudio/best', 'output': output_filename}) as ydl:
    ydl.download(url)`#TODO debug FFmpeg and check if outputname is ok


  


  I expected to have an .mp4 file in my current working directory.

  


  Then I installed the latest version of FFmpeg from ffmpeg-master-latest-win64-gpl.zip and put ffmpeg.exe, ffplay.exe and ffprobe.exe in Scripts python folder (where yt-dlp.exe is). I also installed ffmpeg using pip install.

  


  The Traceback is :

  


  


  [youtube] Extracting URL : https://www.youtube.com/watch?v=4cDqaLxrt6Q
[youtube] 4cDqaLxrt6Q : Downloading webpage
[youtube] 4cDqaLxrt6Q : Downloading android player API JSON
[youtube] 4cDqaLxrt6Q : Downloading MPD manifest
[youtube] 4cDqaLxrt6Q : Downloading MPD manifest
[info] 4cDqaLxrt6Q : Downloading 1 format(s) : 243+251
ERROR : You have requested merging of multiple formats but ffmpeg is not installed. Aborting due to —abort-on-error
Traceback (most recent call last) :

  


  File "C :\Users\t\OneDrive\Documents\Python Scripts\project\main.py", line 88, in 
ydl.download(url)

  


  File "C :\Users\t\anaconda3\lib\site-packages\yt_dlp\YoutubeDL.py", line 3353, in download
self.__download_wrapper(self.extract_info)(

  


  File "C :\Users\t\anaconda3\lib\site-packages\yt_dlp\YoutubeDL.py", line 3328, in wrapper
res = func(*args, **kwargs)

  


  File "C :\Users\t\anaconda3\lib\site-packages\yt_dlp\YoutubeDL.py", line 1486, in extract_info
return self.__extract_info(url, self.get_info_extractor(key), download, extra_info, process)

  


  File "C :\Users\t\anaconda3\lib\site-packages\yt_dlp\YoutubeDL.py", line 1497, in wrapper
return func(self, *args, **kwargs)

  


  File "C :\Users\t\anaconda3\lib\site-packages\yt_dlp\YoutubeDL.py", line 1594, in __extract_info
return self.process_ie_result(ie_result, download, extra_info)

  


  File "C :\Users\t\anaconda3\lib\site-packages\yt_dlp\YoutubeDL.py", line 1653, in process_ie_result
ie_result = self.process_video_result(ie_result, download=download)

  


  File "C :\Users\t\anaconda3\lib\site-packages\yt_dlp\YoutubeDL.py", line 2767, in process_video_result
self.process_info(new_info)

  


  File "C :\Users\t\anaconda3\lib\site-packages\yt_dlp\YoutubeDL.py", line 3189, in process_info
self.report_error(f'msg. Aborting due to —abort-on-error')

  


  File "C :\Users\t\anaconda3\lib\site-packages\yt_dlp\YoutubeDL.py", line 1007, in report_error
self.trouble(f'self._format_err("ERROR :", self.Styles.ERROR) message', *args, **kwargs)

  


  File "C :\Users\t\anaconda3\lib\site-packages\yt_dlp\YoutubeDL.py", line 947, in trouble
raise DownloadError(message, exc_info)

  


  DownloadError : ERROR : You have requested merging of multiple formats but ffmpeg is not installed. Aborting due to —abort-on-error