Source
r/stabbot•
wotanii

How to use stabbot

Pinned

I made a bot that stabilizes videos when summoned. Here is an example of what it does.

You summon it by mentioning u/stabbot in a comment to a video-submission. Then it'll stabilize the video, upload the result and reply to your comment. If you want your result also to be cropped, mentioning u/stabbot_crop instead.

Feel free to post a video submission at r/stabbot and summon the bot there.

Limitations:

  • The summoning comment must be a top-level reply
  • The video must be less than 60s
  • The submission must be either:
    • a direct link to a video file
    • a html5 video
    • a link to youtube, gfycat, imgur or reddit
  • The bot is slow. It takes about 4 seconds to process 1 second of video
  • (edit) The stabilization might not work on every video.
    • The current parameters are a compromise, that tries to get the most out of extremely shaky videos
    • If you have suggestions on how to improve it, let me know

When there is an error (e.g. video was too long), the bot will just ignore the submission.

Currently there is no whitelist or blacklist for subs (--> You can summon it everywhere). I have asked no mods about whitelisting this bot yet (--> you won't see it's reply on anti-bot subs, like r/gifs). I'll ask mods about whitelistening once the bot has made a couple hundred replies.

Note: If you want better results, feel free to open a request at r/ImageStabilization

 

Enjoy my bot.

 

PS: If you think, I should change anything about my bot, let me know.

Posted Sep 26, 2017, 7:18 AM UTC · edited

223
Creativation•

It seems that transient objects that move into a shot (like a bird and then an insect in this video) greatly impact the bot's ability to stabilize a video. Not sure if much can be done to resolve that given that the bot's goal is to stabilize very shaky footage.

6
vanderZwan•

This is amazing! Could you also make a version that has the persistent layering effect? Especially reverse layering seems generally useful.

EDIT: This looks like it uses the FFMPEG video stabilisation filters, correct? I guess that would be harder to combine with persistent layering.

Either way, this is incredible! :)

3
Creativation•

Got a question, on [this r/stabbot post](https://www.reddit.com/r/stabbot/comments/73v9ir/some_real_time_footage_of_the_aurora_borealis_by/) a reddit video was submitted. Do reddit videos need to be submitted in a certain manner to successfully have them stabilized?

2
wotaniiOP•

The same rules apply as in the wild.

In this instance, the bot only finds a link to a submission linking to a video, but not the video.

I'll add it to my list

3
ncc_42•

I recently summoned your bot here, but it only stabilised one part of the video. Is there something which I missed about the bot's use?

If it automatically limits the length of stabilised videos, I would suggest that there be an option to select a certain part of the video. It might also save time.

2
neatchee•

The bot will only work with the first 60-seconds of any video.

It would definitely be neat to be able to provide parameters in the comment, like start and end time, how aggressive it should be, etc.

3
wotaniiOP•

I think the limit comes from gfycat, as they limit all videos to the first 60 seconds.

I'm thinking about changing video hosts to solve this and the sound-issue.

an option to select a certain part of the video

This won't happen any time soon. It might work, but it's a lot of programming very comparable little use.

If I can't find a better host, I might come again to this.

The main problem is: I currently have no support for any kind of parameters. I'd have to work out a concept and test it, while keeping it simple enough so everyone understands it at the first try. But once parameters are in place, it would be easy to and this options. But adding parameters just for this one options seems to be overkill to me.

3
ibru•

I'm thinking about changing video hosts to solve this and the sound-issue.

Streamable is really good. I use it for the majority of my stuff now. 10min length and 1GB size limits. That way you'll get sound too.

3
wotaniiOP•

thanks for this advice. I just looked into it and it almost seems too good to be true.

3
ibru•

I know, almost. The only thing you'd have to watch is if someone summons the bot and it's NSFW. Nudity and gore usually gets deleted. Then again, I'm not sure they allowed it on Gfycat either so...

1
haragoshi•

Openload website doesn't seem to work on mobile. Also the reply didn't come through as a link. Maybe it was a one off error?

https://www.reddit.com/r/whitepeoplegifs/comments/7cm9zs/comment/dpr957j?st=J9YDDSKD&sh=b1ef02db

2
wotaniiOP•

No, sadly this is intentional

Why no video links?

Links to openload are often abused for spam and piracy, and that's why comments containing them require explicit approval from the mods of the respective sub. So for now, there are no clickable links, only copy/past-able links. Lets see how that works out

https://www.reddit.com/r/stabbot/comments/7clfl1/openload_instead_of_gfycat/?ref=share&ref_source=link

2
DwarfishBook•

Amazing

2
excessum•

pretty brilliant

2
[deleted]•

[deleted]

1
randomshazbot•

can someone explain in semi-layman’s terms how this bot works? i’m really curious after seeing the final product

1
wotaniiOP•

The video is processed twice:

first pass: First it looks for edges and corners in a frame (= "image in a video"). Then it tries to find the same corners in the next frame. Then it tries to rotate and translate the 2nd frame, so the so corresponding corners overlap with the first frame. This transformation is saved in a separate file. The process is repeated for all consecutive frames.

The result of the first pass is a file containing frame-to-frame transformations.

second pass: Just applying the transformations would result in the video moving out of view eventually, so the stabilized camera needs to follow the original camera. If it follows too fast, the result will be too shaky. If it follows too slow the result will be out of view for too long.

So the bot averages the transformation of the last 20 frames and the next 20 frames. And this averaged transformation is then applied to frame, resulting in nice and smooth camera movements.

edit: tldr: it looks for corners in the video

3
wotaniiOPMOD•

stabbot now PMs when there was an error.

So from now on the bot should reply to every summon in one way or another. If it doesn't reply, something serious has happened, and you should send me a PM.

e.g.

There was something wrong with [your request](https:...):

Video too long. Video duration: 246.829911, Maximum duration: 240.

there is also a PM, if the bot was banned in a sub; but this was there all along.

1
wotaniiOPMOD•

The PMing was removed, because it goes against reddit-policy

2
[deleted]•

[deleted]

1
CreativationMOD•

That is a very big beneficial change! I've been responding to folks in the sub here who've experienced failed uploads. Well done u/wotanii, Cheers.

1
smthingCryptic•

The URL it uses for nsfw links seems to be broken

1
CreativationMOD•

u/wotanii can you specify in the guide that stabbot only responds to stabilization requests on full submissions and not video links in comments?

Thank you.

1
wotaniiOP•

I changed the first point in "Limitations".

Does this work or should the phrasing be changed?

2
CreativationMOD•

Looks good, thank you.

2
CreativationMOD•

Sorry, maybe just bold the "Limitations:" heading.

1
wotaniiOP•

done

2
CreativationMOD•

Perfect, thanks again.

1
skillnessman•

Is there a workaround for NSFW currently? The bot uploads it into a domain that doesn't seem to be up, stabbot.insxnity.net

1
PolarBearRawr•

bump

1