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• How can I specify domain when downloading m3u8 file in ffmpeg ?

  14 septembre 2022, par Umbrien

  I have .m3u8 file and I am trying to download it like this :

  


  ffmpeg -i file.m3u8 -c copy -bsf:a aac_adtstoasc output.mp4

  


  It gives me errors about downloading it's parts.
I think it's due to the fact that playlist contains partial path to .ts fragments inside without domain in it since this command works fine if i'm specifying URL instead of input file name.

  


  However, I'm using ffmpeg.wasm, which don't have http(s) download support as for now.

  


  I guess maybe I could somehow specify initial domain for m3u8 file's parts so ffmpeg will know from where to download.

  


• FFmpeg-php installation on cpanel server with CentOS7

  31 août 2020, par Mel

  I installed ffmpeg via below commands but unable to install FFmpeg-php on cpanel server with CentOS7.

  


  Checked articles and found very old version. Please anyone can assist with new FFmpeg-php version and installation steps.

  


  rpm —import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro

  


  rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-5.el7.nux.noarch.rpm

  


  yum install ffmpeg ffmpeg-devel -y

  


  Regards,

  


  Mel

  


• How can I simply replace the colors using the color masks on this image and then save it ? With RGBA channels as example

  31 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 the colors this one has, 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