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• Adding watermark to video with ffmpeg with opacity [duplicate]

  4 mai 2021, par Michael Bouix

  I'm trying to add opacity to my watermark and not success..

  


  $commandwater = "/usr/bin/ffmpeg -i ".$videothumb." -i ".$watermarkpng." -filter_complex '[1][0]scale2ref=w=oh*mdar:h=ih*0.2[logo][video];[video][logo]overlay=(W-w)/2:(H-h)/2'  -y ".$watermarkfile;


  


  This code is working fine.. reducing the size and center the image.. I just need opacity now.

  


  How can I make it work ?

  


• Game Music Appreciation

  16 juillet 2012, par Multimedia Mike — Game Hacking

  A little over a year ago, I was prototyping a method to leverage Google Chrome’s Native Client technology in order to play old chiptunes (video game music) directly in a web browser. The last time I posted on the matter, I said that I might have something ready for public consumption by the time Google Chrome 21 rolled around. I thought I was being facetious but I wasn’t too far off. Chrome 20 is the current release version as I write this.

  Anyway, I did it : I created a chiptune music player in Native Client by leveraging existing C/C++ libraries such as Game Music Emu, Audio Overload SDK, and Vio2sf. Then I packaged up the player into into a Google Chrome extension and published it on the Chrome Web Store. Then I made a website cataloging as many chiptunes as I could find for 7 different systems :

  http://gamemusic.multimedia.cx/
  

  Check it out if you have any affinity for old game music or you want to hear how music was made using a limited range of bleeps and bloops. Thus far, the site catalogs NES, SNES, Game Boy, Nintendo DS, Genesis, Saturn, and Dreamcast songs. I’m hoping to add support and catalogs for many more systems, though, eventually bringing support in line with the Chipamp plugin for Winamp.

• Coordinates with file format .ASS

  29 mai 2024, par Alex

  I'm grabbing my text coordinates that I want to use for the file format .ASS and for centering on a 1080 by 1920 video, I have an application that displays where the text is on the video and can retrieve the position, an example of centered position is 310 by 800. When I try to set the position of the text inside the .ASS with those positions it doesn't write the caption where is meant to be. Could some explain how a .ASS positioning works. If use 200 px by 200 px as positioning it places it way further than the center even though the video its a 1080x1920 video, shouldn't it be placed before the center position of the video ?

  


  This is how my .ASS file looks like, I'm using ffmpeg to write the subtitles into the video :

  


  [Script Info]
Title: Video Subtitles
ScriptType: v4.00+
Collisions: Normal
PlayDepth: 0
PlayResX: 1080
PlayResY: 1920


[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BorderStyle, Encoding
Style: Default, Segoe UI,9,&H00FFFFFF,&HFFFF00,&H00FFFFFF,0,0
Style: Background, Segoe UI,9,&H00FFFFFF,&H000000FF,&H00000000,3,0

[Events]
Format: Start, End, Style, MarginL, MarginR, MarginV, Text
Dialogue: 0:00:00.00,0:00:05.00,Default,0,0,0,{\pos(275,876)} {\bord5\3c&H000000&\fs90}LISTEN IN {\r}



  


  

  • Edit : I've added the playresx and y, but the text is still not where its meant to be. To add a bit more context, I have a scene in PyQT that uses a coordinates system to place text over videos, for this text its saying that its at the x axis of 275 and y axis of 876. When I use those coordinates for the .ASS text it doesn't show the same position. Also the scene in which the video and the text is in, its 1080 by 1920, this images show what I want and what I'm getting :