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

[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.

> regards marco
>
>>
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