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• Download Partial Video via HTTP (for Remote Thumbnailing)

  13 février 2012, par HuntedC

  I have videos hosted on Amazon S3. I encode them with Zencoder and store a thumbnail for the video then using Zencoder. However, I need a way to generate thumbnails at certain points in the video (i.e. 00:00:03, 00:10:32, 01:40:18) and store them either on S3 or my server.

  ffmpeg allows remote thumbnailing, however it takes a very long time (sometimes several minutes) to get a thumbnail from the middle of a file—I believe this is because it downloads the entire file up to that point to get the thumbnail.

  My plan is to somehow download the header of the video file via HTTP byte-range request, guesstimate the byte range where I should be looking for the thumbnail, download about a second of video from that part of the file via HTTP byte-range request, then save the header and tiny video locally. I pull the thumbnail from that using ffmpeg and delete the temporary video.

  I have no idea on how exactly this would work (I believe the H.264 MP4 files I'm working with have a dynamic length header, for another issue). Any suggestions or better ideas ?

  Edit : To clarify, Zencoder thumbnailing is great, but they only allow thumbnail creation in combination with transcoding. I don't want to transcode my video every time I create a new thumbnail, so I need to do this on my own without Zencoder.

• Node.js ffmpeg download M3U8 URL as MP4

  9 mai 2017, par Lars Erik Storbukås

  I’ve installed ffmpeg.js using Node.js.

  I want to be able to give an URL as an argument (where the resource located at the URL is an M3U8 file), and download it as an MP4.

  With regular command line ffmpeg (not JavaScript ported), the command would be the following :

  ffmpeg -i http://example.com/file.m3u8 -c copy out.mp4

  I’ve tried the following, but it doesn’t work.

  var ffmpeg = require("ffmpeg.js");
  
  var fs = require("fs");
  
  
  
  var result = ffmpeg({
  
    arguments: ["-i", "http://example.com/file.m3u8", "-c", "copy", "out.mp4"],
  
  });
  
  
  
  fs.writeFileSync("out.mp4", Buffer(result));

• How would I use ffmpeg to download this stream ?

  2 novembre 2015, par amos

  I want to download this http://webcast.mit.edu/spr2014/csail/12apr14/ video

  I’ve downloaded the smil file, installed ffmpeg, however I don’t know which url to use. Moreover, it may need flash authentication which I don’t know how to do either.

  smil :

  <smil>
  
    
  
      
  
    
  
    
  
      <switch>
  
        <video></video>
  
        <video></video>
  
       </switch>
  
    
  
  </smil>

  Please help me with the exact command I could use.