Image Stabilization

Keeping to the subject of stabilization in MLT, integration in kdenlive, ;-) I'm more than happy to test with a number of video formats I use but I really have had little success building from source in the past and this is why I find sunabs svn PPA such a blessing. But I do realize this is Ubuntu only.

What version of ffmpeg should a builder be using? Mine's from ffmpeg git presently.**EDIT** Removed and now using 0.7.2-4:0.7.2-1ubuntu1 :-)

I'm not a KDE fan so really don't want tons of KDE development libraries on my machine if possible especially as I'm going to be adding all this for nothing more than a small gui addition in kdenlive everything else already resides on my machine from sunabs PPA.

Is it possible to have both the stabilize branch and git PPA resident on a machine?

As I already have a 'working' MLT with the stabilize functions (stable or unstable as they may be) in it and it's only the access to the kdenlive gui missing is there no simple way to have this as a tick box inclusion / omit in the svn kdenlive preferences as a temporary measure and WARNING message against it like the threads whatnot already there, that way access to the stabilize functions for testing is open to a wider audience than those willing to compile a separate branch.

Stabilization is a long awaited 'feature' for kdenlive, with an active and willing developer, thanks marco. :-) Be good to see help for users to push the testing of this, to get it into kdenlive.

@betaversion, sorry I missed your previous query to me, my apologies for not responding.

Has the stabilize reached sunab's repos yet? I see the menu items but nothing happens after selecting one of the two menu items. No progress bar, no cpu load.

Now that 0.8.2.1 is released, admittedly only very recently, would it be possible to add the stabilize GUI to kdenlive git to test. :-)

i merged the changes into master. Some test would be nice, but do not use this for production (without saving your project before).
the GUI should be stable, the filter itself should get some more attention.

Hi, I used the build script to build kdenlive and associated apps to get an upto date git build to try stabilize. I only testef one clip so far, a Canon DSLR h264 file, after stabilizing finished it was added to the project as a .mlt file then proxy creation started for the clip as expected project settings.

At that point kdenlive crashed.

Other comments on process:

1. Is a separate window for each clip the best choice, I understand this is WIP but I feel a panel might be more suitable or actually handling in the GUI like proxy generation, this may be more difficult if there is going to be parameters exposed needed to be tweaked for each clip. But a new window for each clip could get messy.

2. Whilst stabilizing is happening no proxys get made for any additional clips added to the project tree.

3. Whilst stabilizing no thumbs ie start and end thumb appear on any clip added to the timeline whilst stabilize is running.

4. Whilst stabilizing any additional clips added to the Project Tree have 'Loading' against them, trying to drag onto the timeline fails with warning sound and told 'Clip Not Ready'

Test was done with vstab only not transcode.

Will do many more tests, looking forward to stabilize being stable. :-)

Great to see it added.

BTW -- for GUI consistency, the job status indication should be an ordinary progress bar and not a slider as used for input.

The proxies for the mlt video files are broken. If you disable and delete the proxy for the .mlt file, you will see the stabilized video result instead of just strange color effects.

thats bad. coudl you upload the resulting mlt file and maybe the source video, so that i can check this ?

the interlace code for yuv seem to have some problems.
i hope i find some time next, to fix this.

EDIT: after some tests, i found, the first image is corrupted in filter, the last image is free'd to early, so it segfaults.

the problem seems to be only in the filter itself

hi marco, I rebuilt MLT & kdenlive from the excellent build scripts on the Wiki about 8 hrs ago, not sure if it included your fixes so will try again later but there did seem to be some improvement in far less smearing but stability was terrible, lots of crashes :-) I tested interlaced DV, not ideal I guess regarding your comment on deinterlacing although I left it interlaced.

I chose DV just because of speed. 15sec clip stabilizes in about 10mins on my old Sempron, a 15sec HDV takes just under an hour, a DSLR HD 15sec nearly two hours, not complaining and only to be expected on my test hardware but adding the mlt files to the timeline crashes kdenlive in a number of ways:

1. Scrubbing through the clip in the Clip monitor

2. Adding the clip to the timeline and moving or scrubbing.

3. Trying to render a clip off the timeline.

I had found I could render a clip with the previous version of the day before yesterday.

Will test again tonight on alternative hardware for comparison.

Cheers

ok, will do, many thanks.

Seems that FFMPEG has sprouted its own stabilization tool!
While browsing the latest FFMPEG sources, I came across this:

libavfilter/vf_deshake.c

haven't yet tried it.

So Kdenlive ver 0.9 is suposed to come with frei0r video stabilizer. Does anyone know where to find it in the app and how to use it?

And there it is. Stabilize > Videostab (vstab) and Stabilize > Videostab (transcode)

I created a job which then appears as "one pending job" and I can see a little progress bar on the bottom of the clip in the project view. Neat
I wonder what happens once the job finishes.

Yep. The stabilized clip appeared in the project tree. Yay. It is a cool feature.

"what does Shutterangle do?" - Shutterangle is the Angle that Images could be maximum rotated for stabilization. http://www.mltframework.org/bin/view/MLT/FilterVideostab.

And yes I often talk to myself !

I have written up a bit of doco on this here http://userbase.kde.org/Kdenlive/Manual/Project_Menu/Stabilize

That page has some clips showing a comparison between the transcode and vstab methods.

Right now for me the transcode method crashes kdenlive with some file formats. For me it crashes with .mov, works with .dv

What version of kdenlive and melt are you using?

You could add comments to this bug report http://www.kdenlive.org/mantis/view.php?id=2900

"all the latest versions" from where ? Because, for example, "the latest version" from Ubuntu software center is not the latest version.

And when you do not "get any real results" do you mean the stabilize is crashing or just that you are not happy with the result?