best syncronization method  

Share your tips and tricks here or get help with any Autopano Video!
No bug reports (of any kind) in this forum!
no avatar
Michael H
Member
 
Topic author
Posts: 149
Likes: 2 posts
Liked in: 5 posts
Joined: Wed Jul 01, 2015 12:21 pm
Info

best syncronization method

by Michael H » Fri Nov 27, 2015 10:51 am

Hi guys
I saw the tutorial regarding syncronization before shooting with turning/spinning the camera a few times back and forth a few times. I just wanted to know if there are any tweeks to that? just on how fast or slow you should spin etc? I just need to have my stuff synced as best as possible.

Cheers

Michael

DesignGuru likes this post.

User avatar
DesignGuru
Member
 
Posts: 21
Likes: 9 posts
Liked in: 1 post
Joined: Wed Aug 19, 2015 12:08 pm
Location: Cape Town, South Africa
Info

Re: best syncronization method

by DesignGuru » Fri Nov 27, 2015 11:01 am

Great question, I was about to ask this but glad you have done so.
What also confuses me is that in the tutorial they say to do this in the start and end of video + clap. What confuses me about this however is that they then select half way in the clip and do a stitch process with 20 seconds selected both ways but that would not cover the start or end of video. Am I the only one that doesn't get that?

no avatar
Michael H
Member
 
Topic author
Posts: 149
Likes: 2 posts
Liked in: 5 posts
Joined: Wed Jul 01, 2015 12:21 pm
Info

Re: best syncronization method

by Michael H » Mon Nov 30, 2015 1:05 pm

I think I will do 3 claps now but would still love to get some more insight

no avatar
OpusMcN
Member
 
Posts: 26
Likes: 0 post
Liked in: 4 posts
Joined: Wed Nov 04, 2015 1:43 am
Info

Re: best syncronization method

by OpusMcN » Tue Dec 01, 2015 1:17 am

I'm using GoPros and gave up on claps. The audio can be several frames out from the video. A quick roll of the camera unit (about 2 seconds, about 45 degrees in all directions) gives me really good sync in everything I've tried so far. If you can see simultaneous movement in all 6 cameras than it should find it.

no avatar
crazy_rabbit
Member
 
Posts: 124
Likes: 8 posts
Liked in: 5 posts
Joined: Sun May 03, 2015 12:11 pm
Info

Re: best syncronization method

by crazy_rabbit » Tue Dec 01, 2015 11:33 am

I have gone to using flash to 'flash' the correct frame on all the gopros. The problem with motion sync is that it doesn't work when using really wide angle lenses (or perhaps I'm not spinning fast enough?) With regular go pros I get fine sync (great sync actually) with motion detection but using stock gopro lenses, once I change the lenses for something wider, the motion detection no longer works.

Audio sync works well as long as you don't have lots of cameras and lots of motion. Otherwise you get jiggle city.

Flash sync is more time consuming to sync up, but much more precise than audio, and probably more precise than motion as you get truly frame accurate syncing. That said if you use lots of cameras and lots of motion, higher FPS is better.
Co-Founder and Chief Creative Technology Officer
Vesmir.agency
http://www.vesmir.agency

no avatar
bartch
New member
 
Posts: 9
Likes: 0 post
Liked in: 2 posts
Joined: Sat Dec 26, 2015 10:59 pm
Info

Re: best syncronization method

by bartch » Mon Jan 11, 2016 10:19 pm

I use a little metal toy clicker, worked perfectly so far.
Image

no avatar
jesusrg
Member
 
Posts: 46
Likes: 2 posts
Liked in: 0 post
Joined: Sat Nov 14, 2015 9:06 pm
Info

Re: best syncronization method

by jesusrg » Wed Jan 20, 2016 9:33 pm

Best sync method so far is flashing 2 or 3 times all cameras at the same time, with led light for about 0,5secs each flash, no normal flash cause cmos problems of line scan rolling shutter, then sync manualy, i had to make myself an app to convert the minutes/seconds to miliseconds and put that on the sync part of autopano. That being said sometimes, depends of the movement, one camera can be out of sync by 1/2 frame, so you have to chose with which frame is ok.
Best regards.
Jesus.

no avatar
crazy_rabbit
Member
 
Posts: 124
Likes: 8 posts
Liked in: 5 posts
Joined: Sun May 03, 2015 12:11 pm
Info

Re: best syncronization method

by crazy_rabbit » Thu Jan 21, 2016 3:41 pm

With flashing the CMOS with regular flash I still have a clear frame where the flash "starts".

Doesn't this workflow slow you down considerably? Do you trim each video file to where the flash starts in another program? Or do you search for it in AVP frame by frame?
Co-Founder and Chief Creative Technology Officer
Vesmir.agency
http://www.vesmir.agency

no avatar
fabiobellotti
Member
 
Posts: 51
Likes: 0 post
Liked in: 0 post
Joined: Mon Sep 07, 2015 10:14 pm
Info

Re: best syncronization method

by fabiobellotti » Fri Jan 22, 2016 10:41 pm

Hi....for me the best method (we use a 2/3/4 modified gopro hero 4 black) is:

- gopro remote: start recording
- gopro remote: stop recording
- hand claps (let's say ciak eheheheh)

I don't know why but there's a sort of lag time on the first time you try to record by the remote....if you "fake" the first, the second only has 2/3 frame of difference between cameras. With this difference, the clap is enough to reach a good sync
Fabio Bellotti
==================================
http://www.solidcolor.org
Digital VideoMaking & Motion Graphics
http://www.solidcolor.org/360AV
VR at its best - 360 Video & AUDIO solutions

no avatar
aquabluleo
Member
 
Posts: 41
Likes: 3 posts
Liked in: 3 posts
Joined: Mon Feb 29, 2016 4:53 pm
Info

Re: best syncronization method

by aquabluleo » Wed Mar 09, 2016 3:59 am

DesignGuru wrote:Great question, I was about to ask this but glad you have done so.
What also confuses me is that in the tutorial they say to do this in the start and end of video + clap. What confuses me about this however is that they then select half way in the clip and do a stitch process with 20 seconds selected both ways but that would not cover the start or end of video. Am I the only one that doesn't get that?


Same here...are we missing something...?

Yhks

User avatar
martin.arnoux
Kolor Team
 
Posts: 544
Likes: 1 post
Liked in: 27 posts
Joined: Wed Feb 26, 2014 2:57 pm
Info

Re: best syncronization method

by martin.arnoux » Wed Mar 09, 2016 4:51 pm

Hi,

The dual audio clap (start / end) is just for safety raisons. You can use the beginning and the end for the sync but not both.

They should give you the same result when it's accurate.

Hope it helps,

Martin

no avatar
aquabluleo
Member
 
Posts: 41
Likes: 3 posts
Liked in: 3 posts
Joined: Mon Feb 29, 2016 4:53 pm
Info

Re: best syncronization method

by aquabluleo » Thu Mar 10, 2016 12:57 am

OpusMcN wrote:I'm using GoPros and gave up on claps. The audio can be several frames out from the video. A quick roll of the camera unit (about 2 seconds, about 45 degrees in all directions) gives me really good sync in everything I've tried so far. If you can see simultaneous movement in all 6 cameras than it should find it.


A quick roll of the camera unit (about 2 seconds, about 45 degrees in all directions)
Do you spin them only in one direction ex: clockwise?
So you angle camera rig on a 45 degree and rotate clockwise and repeat for all directions?

I saw a tutorial which just rotates left to right real quick and others 360 rotation in one direction.

If your process works...I want to make certain I understand it...
Cause in my tests audio worked best on freedom 360 6 gopros...

Thks


Who is online

Users browsing this forum: No registered users and 1 guest