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> To playback an mp4 file you need to have it wholly

720p or better videos on youtube are all MP4 now. You just have to move some atoms around within the video file to prepare them for "streaming" playback. There's open source software to do this.

Then again, the ability to play an incomplete file is not really useful if you're fetching a movie via torrent, which is what I would assume most of these guys are using.



Actually the latest utorrent lets you stream the video files while you're downloading them.


That's pretty cool. How does it achieve that? I'm assuming it assigns a higher priority to the chunks closer to the playback cursor.


By the look of it, yes. With well seeded torrents it actually works very nicely.


Bitcomet has actually beein doing this for ages.




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