torrent with multifile

[f1atlux]

webtorrent.js latest
firefox latest

hi there, i've a torrent file which has multiple files. myname.txt, blabla.jpg and stream.mp4

webtorrent.js is not start streaming on that situation. is there any idea to modify it like "detect that file type" thing?

best.

[vankasteelj]

I personnaly do this:

var supported = ['mp4', 'm4v', 'avi', 'mov', 'mkv', 'wmv'];
var extname = function (filename) {
  return filename.split('.').pop();
};

// hide non-video files from selection and set index
for (var f in torrent.files) {
  torrent.files[f].index = f;
  torrent.files[f].display = supported.indexOf(extname(torrent.files[f].name).toLowerCase()) !== -1;
}

note: there might be a better way to find the file extension, I'm using node so I do require('path').extname(filename). in the same spirit, I can pay all those extensions above, but I guess the browser can only play mp4, maybe mov... anyway you get the idea

I can then easily select files, because I only display those who have display=true and I can pick them because there is the "real" index (the one that interrests webtorrent anyway) there. You can then:

var fileIndex = <the actual index you set above, you can also loop to find the biggest .length, it will be 99.99% of the time the video file>;

for (var f in torrent.files) {
  var file = torrent.files[f];
  if (f === parseInt(fileIndex)) {
    file.select();
  } else {
    file.deselect();
  }
}

[feross]

@f1atlux You should do something like what @vankasteelj suggests. All the information is the torrent.files array for you to determine which files you want to stream.

[vankasteelj]

it does have the inconvenient of being heavy to process on v8 with a 100+ file torrent on a slow CPU like an Atom Z

[feross]

@vankasteelj Looping through an array one time is not a heavyweight operation. Anyway, what you're suggesting would have to be done internally in webtorrent either way, so it makes no performance difference:

var files = torrent.files.filter(function (file) {
  var ext = path.extname(file)
  return ext === '.mp4'
})
console.log(files) // now this array only contains mp4 files

[vankasteelj]

it's not the looping array that is heavy, it's the 99 occurrences of file.deselect() on a 100-file torrent. Because part of the point of streaming a torrent is not to download it entirely if it's, for example, the complete CCC collection in 1 torrent.

[vankasteelj]

torrent.deselect() could be a useful api (if you're not internally looping and deselecting each file^^)

[feross]

Yeah, there is already an open issue about improving the way we do selections. For now, we only have file.deselect(). You can follow that issue here: #164

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