[Kdenlive-devel] [Mlt-devel] video stabilization

[Marco Gittler]

Am 12.08.2011 um 08:05 schrieb Dan Dennedy:

> On Thu, Aug 11, 2011 at 10:20 PM, Marco Gittler <marco at gitma.de> wrote:
>> 
>> Am 11.08.2011 um 22:54 schrieb Dan Dennedy:
>> 
>>> On Thu, Aug 11, 2011 at 10:33 AM, Marco Gittler <marco at gitma.de> wrote:
>>>> Hi
>>>> 
>>>> i made an mlt plugin, that uses the stabilization from http://vstab.sourceforge.net/.
>>>> First tests are working very good.
>>> 
>>> What a nice contribution!
>> :)
>>> 
>>>> There a lots of speed up to be done (cache calculated values in a file, for later usage).
>>> 
>>> I have not looked at this yet, but can you simply put the calculated
>>> values in a string property (colon-delimited list of numbers or json
>>> ala rotoscoping). Then, when serializing a mlt composition to xml, it
>>> will be saved. Next, when loading a mlt xml, the plugin can use the
>>> values from the property instead of calculating them?
>> i implemented this now.
>> but it looks first it is not working. but  i found out, the filter will have 2 runs with the video file, started with
>>  melt ~/Desktop/IMG_0286.MOV -filter videostab -verbose
>> 
>> on the first run it "deshakes" for 38 frames (and saves the values)
>> on 2nd run (the visible on) there are 45 (correct length) frames.
>> how can the first (false length) run be prevented, else the vector data are not correct ?
>> 
>> i  had also a first run with 45 frames (a lucky moment) , then it will work perfect.
> 
> It sounds like in the first run, it is frame-dropping if you are using
> the sdl consumer. Try running with '-consumer sdl real_time=-1'. Hmm..
> if you run the first pass with '-consumer xml:test.mlt' to save the
> values then it will not run through all of the frames, so that mode of
> operation will not work as I originally thought. I think we need to
> change the XML consumer to add an option to iterate through each
> frame. This weekend I will download your plugin and figure out what to
> do.

some more test with other videos are working. it seems that the problem exists only with video @30fps
the first run will then be done with 38 frames (46 at 30 fps= 38 @25 fps with the same time to run)
25fps videos does not have this "bug".

so i don't know if this must be fixed, or if this is a "video profile" thing that must be set for this.

melt -profile ntsc_dvd ~/Desktop/IMG_0286.MOV -filter videostab -verbose and
melt -profile pal_dvd ~/Desktop/IMG_0286.MOV -filter videostab -verbose
the video has every time 38 frame (on the 2 runs)

melt ~/Desktop/IMG_0286.MOV -filter videostab -verbose
will have first run 38, second 46 frames. (it is a short video from an iPhone)

regarde marco

> 
>> regards marco
>> 
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> 
> 
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