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

[Dan Dennedy]

On Fri, Aug 12, 2011 at 1:14 AM, Marco Gittler <marco at gitma.de> wrote:
>
> 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)

Unless you made those profiles yourself, they do not exist. See 'melt
-query profiles' to see a list of what is "installed." Try using
dv_ntsc  and dv_pal.

>
> 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
>>>
>>>>
>>>> --
>>>> +-DRD-+
>>>>
>>>> ------------------------------------------------------------------------------
>>>> Get a FREE DOWNLOAD! and learn more about uberSVN rich system,
>>>> user administration capabilities and model configuration. Take
>>>> the hassle out of deploying and managing Subversion and the
>>>> tools developers use with it.
>>>> http://p.sf.net/sfu/wandisco-dev2dev
>>>> _______________________________________________
>>>> Mlt-devel mailing list
>>>> Mlt-devel at lists.sourceforge.net
>>>> https://lists.sourceforge.net/lists/listinfo/mlt-devel
>>>
>>>
>>
>>
>>
>> --
>> +-DRD-+
>>
>> ------------------------------------------------------------------------------
>> Get a FREE DOWNLOAD! and learn more about uberSVN rich system,
>> user administration capabilities and model configuration. Take
>> the hassle out of deploying and managing Subversion and the
>> tools developers use with it.
>> http://p.sf.net/sfu/wandisco-dev2dev
>> _______________________________________________
>> Mlt-devel mailing list
>> Mlt-devel at lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/mlt-devel
>
>



-- 
+-DRD-+