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• Using a HLS m3u8 or DASH mpd as ffmpeg input : seeking performance

  21 septembre 2020, par coder_uk

  I wonder if any FFMPEG wizards can help with this :

  


  I've seen examples (like FFmpeg code not working on http url for thumbnail extraction) of using a http URL as the input but so far only with an .mp4.

  


  If I were to instead use an ABR .m3u8/.mpd as the input (which, though a text file, does represent a video) ... is FFMPEG smart enough to work with it ? To parse it ? So ... if I gave it a 5 hour HLS VOD m3u8 as input (-i http...), and asked it for a frame at 4 hours in (-ss), would it only download that one 10s segment at the 4-hours point ? And so only need to download a small 10 second .ts file. Or does it download the whole thing ?

  


  Thanks.

  


• 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.

• Downloading a video using fluent-ffmpeg in nodejs and express

  1er avril 2021, par Apdo Elsaed

  I am working on a side project to download videos from Reddit, but they separate video and audio in different files. so i have to merge them first before downloading them in the client. i was able to do all of this as in the following snippet of code.

  


  const ffmpeg = require("fluent-ffmpeg");
const proc = new ffmpeg();

app.post('/download', async (req, res) => {
   
   const audio = "some aduio link";
   const video = "some video link";

   proc.addInput(video)
     .output('${some path}./video.mp4')
     .format('mp4')
     .on("error", err => console.log(err))
     .on('end', () => console.log('Done'));

  if(audio) {
  proc.addInput(audio);
  }

  proc.run()
 
});


  


  using the above code, the video is being download locally in the the server in the specified path.

  


  but i want to download the video in the client browser who sent the request. i tried :

  


  proc.pipe(res); 


  


  but it didn't work, it's my first time working with ffmpeg , so it would be nice if someone give me a hint