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• ffmpeg looping short videos inside collage of video

  16 avril 2018, par Yogesh Kale

  See reference link :-
  https://trac.ffmpeg.org/wiki/Create%20a%20mosaic%20out%20of%20several%20input%20videos
  i am making video collage using ffmpeg. i am able to make a collage of videos.So my question is : looping short videos inside collage of video.
  currently short video gets finished and remains as it is till large length video ends.i want looping short video till large video ends
  i am using overlay of ffmpeg for making collage

• Using ffmpeg to increase framerate without changing duration [closed]

  11 février 2024, par sarunw

  I want to increase the video frame rate with FFmpeg.

  


  I found from this website, https://trac.ffmpeg.org/wiki/ChangingFrameRate, that I can use -r or fps filter.

  


  The doc said the output duration of the video would stay the same, but that is not the case in my test.

  


  What I tried so far.

  


  I got a video with a duration of 19 seconds at 1.45 fps (I took this number from the QuickTime app)

  


  After using these commands, fps become 30, but the duration becomes 1 second.

  


  ffmpeg -i <input /> -filter:v fps=fps=30 <output>&#xA;ffmpeg -i <input /> -filter:v fps=30 <output>&#xA;ffmpeg -y -r 30 -i <input /> <output>&#xA;</output></output></output>

  


  Here is the file https://www.dropbox.com/scl/fi/nl6yabgl9yzikx12mkvnu/sample2.mp4?rlkey=wk4fsu2vvkcui31cneq8vruik&e=1&dl=0

  


• Multimedia Exploration Journal : The Past Doesn’t Die

  12 juillet 2011, par Multimedia Mike — Game Hacking

  New haul of games, new (old) multimedia formats.

  Lords of Midnight
  Check out the box copy scan for Lords of Midnight in MobyGames. In particular, I’d like to call your attention to this little blurb :

  
  
  

  Ahem, "Journey through an immense world — the equivalent of 8 CD-ROMs." Yet, when I procured the game, it only came on a single CD-ROM. It’s definitely a CD-ROM (says so on the disc) and, coming from 1995, certainly predates the earliest DVD-ROMs (which can easily store 8 CD-ROMs on a disc). Thus, I wanted to jump in a see if they were using some phenomenal compression in order to squeeze so much info into 600 or so megabytes.

  I was surprised to see the contents of the disc clocking in at just under 40 megabytes. An intro movie and an outro movie account for 75% of that. Format ? None other than that curious ASCII anomaly, ARMovie/RPL with Escape 122 codec data.

  Cyclemania

  
  
  

  Cyclemania is one of those FMV backdrop action games, but with a motorcycle theme. I had a good feeling I would find some odd multimedia artifacts here and the game didn’t disappoint. The videos are apparently handled using 3-4 discrete files per animation. I’ve documented my cursory guesses and linked some samples at the new MultimediaWiki page.

  Interplay ACMP
  This is unrelated to this particular acquistion, but I was contacted today about audio files harvested from the 1993 DOS game Star Trek : Judgment Rites. The files begin with the ASCII signature "Interplay ACMP Data". This reminds me of Interplay MVE files which begin with the similar string "Interplay MVE File". My theory is that these files use the ACOMP compression format, though I’m still trying to make it fit.

  Wiki and samples are available as usual if you’d like to add your own research.