MultiCamera Editor Sync issue

[WorstCases]

Hello guys.

I have out of sync Video AFTER using MultiCamera editor, where the Video is synced prior closing (after saving).

I have 2 VideoSources. VideoSource1=AudioSource too.

After the MultiCameraEdit is done, if the file is added to the timeline I am totally out of sync, Audio-wise (even if the clip shows the picture from VideoSource1, which also is the Audio source).

Any suggestions so that the fun on my project can come back?

[lata]

Hi
After running a quick test to confirm that the MCE appears to keep at least my files in sync
Can you tell us
1 / are your two videos using the same recording settings, especially the frame rate
2 / When you added the two camera clips to MCE did you hit the Sync option to line up Camera 1 and Camera 2
You can view the wave form to possibly compare the two tracks for sync
3 / the MCE will use the frame rate of camera 1 to set the timelines frame rate.
4 / I then chose camera 1 and 2 alternatively, also removed some sections
5 / returning to VS editor the VSP was placed in the library
6 / I made sure the timelines were using settings similar/same as Camera 1 video
7 / dragging the vsp to the timeline showed as in sync, again I could view the wave form by switching to Sound Mixer view
Playing the project seemed ok.

When did you first notice the sync issue, if its ok within MCE then it should be ok on the VS edit timelines

[WorstCases]

Hello lata.

I did run into this issue on a previous project too.
Did then have to start all over with the MCE (same source files) and I managed to get it to work in Sync.

On the current project: The FPS and encode is the same for both clips (did re-encode prior working in VS - see attachment). The source clips are in Sync. Since the Audio in MCE comes from Clip1, I assume that at least this clip sould be in sync later on the timeline, but it is not...
The re-encoding was mde with a variable bit rate. Could this be an issue?

I do sync with the wavform Audio either by manually moving the source clips left to right, or by putting a marker and sync. I find the marker and sync troublesome, therefor I usuallyy do it manually with the wave form of both clips, and zoom in on the timeline to get it accurate (to the frame).

This whole issue is weird. Very troublesome, because I can not reproduce the issue, so I have to start over, which in this case (30Min Video) takes pretty much forever... I wish I could say more, so that the issue can be reproduced.

[lata]

Hi
Viewing the image from your original post, Camera 1 appears to have 3 clips
I assume Camera 1 was paused during recordings whilst Camera 2 recorded the whole event, well nearly as there is a small clip at the end.
So why are there no gaps on camera 1 timeline?
As it shows there I don’t understand how it can sync all three clips without creating a gap.
If you use Auto Sync does it do the job or throw an error because its finding it hard to do.

[WorstCases]

Correct. Camera 3 hast three clips, because the camera splits the files while recording. It could as well be a continious clip. That's why there are no gaps. Same with Camera 2, just that the automatic splitting happens in a longer interval.

Auto Sync does not work in this case. I have to do it manually. The first camera has a few additional frames betwenn the clips, which throws off the Autoync. I have to shorten the clips a few frames and sync manually.

Just to make sure the info is not missing: Even the clips from Camera 1 are out of ync if the MCE-File is dragged to the timeline, even though it's also the Audio source...

If it is a user error, I don't know what I am doing wrong.

By the way: In the main program (VS) I can use the scroll whell of the mouse to either zoom in/out in the timeline, or move it. In the MCE the mouse whell does zoom in/out only. Any sueestions there, because I find it bothersome to navigate in the MCE.

[lata]

Hi
Trimming the clips, have you used this before on other MCE projects
Do you think that trimming within the MCE is causing this Audio Sync issue.
Does it make a difference if you trim the end of clip 1 or the beginning of clip 2? Just thinking out loud as I have never had to trim clips
I know you did not want to re-do the entire project but I do not see any other option.
What happens if you add the 5 clips to different cameras 1 to 5, that way each file will have its own timeline, auto sync should work.

I will try to run a test where I have to trim the clips, but will have to create a few test files to do that.

Scroll wheel, seems to work same for main timelines and MCE.
On the main timeline the mouse only scrolls the zoom, it does not move the curser up and down the timelines, not for me?

[WorstCases]

I did start all over. I have perfect sync in MCE (had to shorten one clip 1-2 frames towards the end of the project).
Save in MCE and dragging it into the VS timeline, I am OUT OF SYNC. W

Did export (share) two short (preview-range) parts of the project. On at the beginning (prior any clip was shortened in MCE) and one towards the end, (after a clip was shortened in MCE). Both OUT OF SYNC. What the ****... There must something happening at the import of the MCE-file to the VS timeline, I assume...

Just because I am lacking ideas, I did attach the project setting (same frame rate, as soure...)

[lata]

Hi
Just completed a test which seems ok?
I first cut the main clip into 4 smaller clips, each clip being a little longer than its neighbour, they overlapped
Added these 4 to Camera 1 and the original full clip to camera 2
Trimmed the ends of all clips, a long way far enough to create a gap
Auto Sync also showed a gap, I then extended the ends of each clip to fill the gap, if you get my drift
All in sync
Chose the camera angles between the two timelines.
Returning to the edit timelines dragged the VSP to the top track
Deselected Mute on the top track to compare wave form with Music track ( Sound Mixer ) no problems
The only difference are the files you are using.

Your last post says you rendered sections of the project which was out of sync, was that without using MCE

Ignoring MCE
If you add the original video clips to the timeline and render to same as project settings, is that out of sync?

[weaver]

.
The re-encoding was mde with a variable bit rate. Could this be an issue?

I do not know why you selected VBR for conversion? In a studio or processing site you should always keep the highest quality ( what a VBR is not) as it may create somewhere always a problem. VBR was primarily designed for final distribution and not for processing.

[WorstCases]

Ignoring MCE
If you add the original video clips to the timeline and render to same as project settings, is that out of sync?

In that scenario: Perfect Sync. The problem seems to happen, wehn VS is importing the MCE data to it's timeline...

[WorstCases]

I do not know why you selected VBR for conversion?

I thought, that the most important thing is that all clips have same (fixed) frame rate.
VBR seemed like a good option, since file size should be reasonable, while quality remains acceptable. I'm not (yet) doing anything where highest quality is a concern, so was fine with is, until now where it might cause trouble down the road...

[canuck]

VBR has nothing to do with Fixed Frame rate.
I would think, having a constant bit rate would be best for use with multiple camera videos

[weaver]

VBR has nothing to do with Fixed Frame rate.
I would think, having a constant bit rate would be best for use with multiple camera videos

That is correct.
In VBR there are internal synchronisation issues of components which may influence the entire signal processing.
That is why I would not recommend any originals ( video files intended to edit) to convert into VBR before editing or processing.it is not a question of quality but the functionality.
The final video can be converted ( but check, some players are nit very happy with VBR) to VBR and you can delete the originals.

[WorstCases]

Scroll wheel, seems to work same for main timelines and MCE.
On the main timeline the mouse only scrolls the zoom, it does not move the curser up and down the timelines, not for me?

On the main timeline I can use the mouse wheel to move left/right on the timeline, if I'm within the timeline (where the clips are lovated) with my cursor. In MCE I can not at all use the mouse to move lest/right - at least I don't know how. Makes navigating difficult.

On the main topic:
I will re-encode all my files to a fixed bitrate and give it another try.

[lata]

Hi
Did you try using the audio from both cameras, that way there will be no extra audio file
Audio will be in sync, and if the camera angle cut points are in the right place then it should be ok

The question is how good is camera 2 audio