On 9/20/15, jb <j...@kdenlive.org> wrote:
> On Sunday, September 20, 2015 11:08:26 AM Zenny wrote:
>> Hi,
>>
>> I came to learn a hard way that two video sources can be keyed with
>> the following:
>>
>> # melt BACKGROUND:VIDEO in=400 \
>> -track FORGROUND VIDEO in=450 \
>> -filter chroma key=0x00ff0000 variance=0.45 \
>> -transition composite
>>
>> However there are a few caveats:
>>
>> §1. How can one remove keyspills to around the keyed video from command
>> line? §2. How to fine tune the keying like one can do with kdenlive in
>> command line? Like adding blur, keyspill-mopup and so on?
>
> The best way to find out is to do it in kdenlive, save the project, then
> open
> it in a text editor. Kdenlive project files are in MLT's xml format.
>
> Then, you can look at what MLT effects and parameters are used. Filters have
> a
> <filter> tag, for example (extracted from a .kdenlive project file):
>
> <filter id="sepia">
> <property name="track">0</property>
> <property name="u">75</property>
> <property name="v">150</property>
> <property name="mlt_type">filter</property>
> <property name="mlt_service">sepia</property>
> <property name="kdenlive_id">sepia</property>
> <property name="tag">sepia</property>
> <property name="kdenlive_ix">1</property>
> </filter>
>
> The filter id is the effect name for MLT, and the parameters are "u" and
> "v"
>
> You can get infos about an MLT effect with:
>
> melt -query filter=sepia
>
> Hope it helps,
This helped, but how to interpret the following from kdenlive mlt file
to command line?
<filter id="chroma">
<property name="track">0</property>
<property name="key">0xd8f0cfff</property>
<property name="variance">0.05</property>
<property name="mlt_type">filter</property>
<property name="mlt_service">chroma</property>
<property name="kdenlive_id">chroma</property>
<property name="tag">chroma</property>
<property name="kdenlive_ix">5</property>
<property name="disable">0</property>
<property name="kdenlive_info">1/-1/</property>
</filter>
<filter id="frei0r.alpha0ps">
<property name="track">0</property>
<property name="version">0.3</property>
<property name="mlt_type">filter</property>
<property name="mlt_service">frei0r.alpha0ps</property>
<property name="kdenlive_id">frei0r.alpha0ps</property>
<property name="tag">frei0r.alpha0ps</property>
<property name="kdenlive_ix">6</property>
<property name="Display">0.0</property>
<property name="Display input alpha">0</property>
<property name="Operation">0.3</property>
<property name="Threshold">0=1</property>
<property name="Shrink/Grow/Blur amount">0=0.2</property>
<property name="Invert">0</property>
<property name="kdenlive_info">1/-1/</property>
<property name="disable">0</property>
</filter>
<filter id="frei0r.keyspillm0pup">
<property name="track">0</property>
<property name="version">0.2</property>
<property name="mlt_type">filter</property>
<property name="mlt_service">frei0r.keyspillm0pup</property>
<property name="kdenlive_id">frei0r.keyspillm0pup</property>
<property name="tag">frei0r.keyspillm0pup</property>
<property name="kdenlive_ix">7</property>
<property name="Key color">0xd8f0cfff</property>
<property name="Target color">0xe7cef0ff</property>
<property name="Mask type">0</property>
<property name="Tolerance">0.255</property>
<property name="Slope">0.313</property>
<property name="Hue gate">0.25</property>
<property name="Saturation threshold">0.197</property>
<property name="Operation 1">3</property>
<property name="Amount 1">1</property>
<property name="Operation 2">4</property>
<property name="Amount 2">0.467</property>
<property name="Show mask">0</property>
<property name="Mask to Alpha">0</property>
<property name="disable">0</property>
<property name="kdenlive_info">1/-1/</property>
</filter>
Thanks!
/z
>
> jb
>
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