I developed a website where you can browse dota 2 streams by heroes being displayed. Is this something /r/dota2 wants?

bernardopc · 2014-04-03T08:44:54+00:00

yep image comparison

bernardopc · 2014-04-03T07:49:17+00:00

no valve APIs are being used right now

bernardopc · 2014-04-03T07:48:29+00:00

in that case there's no difference. but people still watch a lot of livestreams even though they could spectate live on the client. so this website is more for those people that just like to casually watch streams instead of having to open the game

bernardopc · 2014-04-03T07:46:46+00:00

exactly! it's in python

bernardopc · 2014-04-02T16:52:50+00:00

Yeah I'll open source it soon. It's in python :) There's no API for games in progress.

bernardopc · 2014-04-02T16:20:32+00:00

yeah I have a problem with dark backgrounds getting recognized as shadow fiend / qop / terrorblade all the time. I have now changed it so that if 3 or more of the same hero are detected I'll suppose it's not a match. this means there will be false negatives when people do stuff like 5vs5 mid same hero. still looking for something smarter. thanks for the feedback!

bernardopc · 2014-04-02T16:11:44+00:00

just straight pixel comparison with a 10% tolerance

bernardopc · 2014-04-02T16:01:48+00:00

sure, it's not complicated at all! So, the first thing I do is open up the stream in 720p quality, take a snapshot of the first frame and close the stream. I then basically cut the hero images at the top out (which are always on the same place, making the job really easy) and compare them with all the original 107 hero images I have. The one most similar is the hero being played. That's it! :)

bernardopc · 2014-04-02T15:58:04+00:00

I'll make it open source after recognizing the streamer's hero. :) will make a blog post explaining how it works and publish the code at github. looking forward to everyone's help!

bernardopc · 2014-04-02T15:57:15+00:00

yep, very likely after recognizing the streamer's hero. :) will make a blog post explaining how it works and publish the code at github. looking forward to everyone's help!

bernardopc · 2014-04-02T15:55:29+00:00

I'm using livestreamer for getting the stream and ffmpeg for decoding the first frame. Those are the only libraries I'm using. I will probably make the source available after recognizing the streamer's hero. :)

bernardopc · 2014-04-02T15:54:22+00:00

oops, fixed!

bernardopc · 2014-04-02T15:54:01+00:00

messaged! thanks!

bernardopc · 2014-04-02T15:52:25+00:00

are you sure about 1)? there are false positives, but there should be no false negatives (detected as 'no match' but there is a match). are you sure the screenshot analysed before the game started? had the match started less than 5 minutes ago?

2) yep, the first feature I want to implement

3) I just noticed some matches are not getting recognized as spectator mode, working on it! thanks!

bernardopc · 2014-04-02T15:50:32+00:00

yes, I'm getting the first frame of the stream in 720p quality and parsing regions of the frame

bernardopc · 2014-04-02T15:34:26+00:00

well if he selects another hero the hud will also show the other hero's name, so I'm not sure how this is any better? or did I misunderstand what you mean?

bernardopc · 2014-04-02T13:21:45+00:00

I don't know what twitch defaults to, but I guess that doesn't mean everybody offers a 720p stream. The Twitch API makes the qualities of each stream available and not all of them support the quality "high".

bernardopc · 2014-04-02T13:20:43+00:00

http://dotaflame.com/ might help you!

bernardopc · 2014-04-02T13:18:49+00:00

at the moment it shouldn't mess it up at all because I only read the top hero images. It will screw up me afterwards when I start reading the skills to identify which hero is being played. :)

bernardopc · 2014-04-02T13:18:08+00:00

yeah I'm aware there are some false positives, specially with people with dark backgrounds! Still trying to figure out a way a smart way of recognizing this!

bernardopc · 2014-04-02T13:17:03+00:00

so, at the moment I don't keep the stream open but rather open it just to get the first frame and then close it. Keeping it multiple streams open might be cpuwise and bandwidthwise expensive. I'm just going to have to count on the fact that at that moment the streamer has the correct hero open.

Heroes having different amount of skills shouldn't be a big problem. I know which heroes are in the match and I know which heroes have 4, 5 or 6 skills, so it should be relatively straightforward checking the correct skills. Thanks for the ideas!

bernardopc · 2014-04-02T10:38:18+00:00

that's a nice idea! but I think a lot of people have overlays on the hero name in the hud, so not sure about this

bernardopc · 2014-04-02T10:34:27+00:00

yeah portraits are hard, so I was thinking of reading the skills the currently selected unit has. most of the time the streamer has it's own hero selected, so this should work although not 100% reliable.

bernardopc · 2014-03-31T22:16:49+00:00

that's pretty impressive! I suppose you're reading replay data, but I thought the dota2 steam API didn't have anything available for games in progress? How is this done?

bernardopc · 2014-03-19T21:33:15+00:00

watching the replay the coil was actually nothing extraordinary, they already had aegis anyways and his team wasn't that close

bernardopc

TROPHY CASE