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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.

  


• 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

  


• Concatenate chunk containg headers to another chunk in h264

  18 novembre 2014, par Ortixx

  I’m trying to extract thumbnails from a torrent stream by downloading the first couple of chunks to get the headers, another set of chunks from the middle and then concat them to have a single video file.

  For this I’m using nodejs but I’m having trouble with the concatenation part. Obviously the headers include the length of the video so if I simply concat another chunk to the end of the headers chunk, it won’t work.

  In other words, I have 2 chunks of a video file : The first one contains the headers and some material and the other one is fully composed of a video stream. I want to combine the two to form a single video file
  So my question is how can I make this work properly if at all ?