Re: [Mlt-devel] Frei0r & Ladspa Filters
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From: Jonathan T. <jon...@gm...> - 2009-09-18 04:26:13
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One more question for you. I'm using the following Python code to get a list of available mlt filters. I figured out a way to use the Repository object to get a list of filter names. But I have been unable to get a more detailed list of properties for a particular filter (such as frei0r.water). What is the recommended way to get a list of properties (similar to what melt outputs) for each filter? >> import mlt >> f = mlt.Factory() >> r = f.init() >> >> filters = r.filters() >> for x in range(0, filters.count() - 1): >> print filters.get_name(x) I figure I could always parse the output from melt, but I'm sure there is a better way to do it. =) Thanks in advance! -Jonathan On Thu, Sep 17, 2009 at 4:39 PM, Jonathan Thomas <jon...@gm...>wrote: > Got it. Thanks for the quick response. > > Thanks, > -Jonathan > > > On Thu, Sep 17, 2009 at 4:38 PM, Dan Dennedy <da...@de...> wrote: > >> On Thu, Sep 17, 2009 at 2:32 PM, Jonathan Thomas >> <jon...@gm...> wrote: >> > Hi Dan, >> > Does MLT have any ability to key-frame Frei0r, LADSPA, or sox effects? >> >> No, it is on the ToDo list under PropertyAnimation. >> http://www.mltframework.org/twiki/bin/view/MLT/ToDo >> >> I am thinking mid-term for this - sometime next year. I was hoping to >> get to it this year, but that will not happen. >> All you can do now is attach multiple instances of the same filter >> with in & out for each range. That lacks value interpolation, but it >> is something. >> >> > On Wed, Aug 12, 2009 at 11:50 PM, Dan Dennedy <da...@de...> wrote: >> >> >> >> On Wed, Aug 12, 2009 at 6:29 PM, Jonathan >> >> Thomas<jon...@gm...> wrote: >> >> > Hi Dan! I am ready to start adding in Frei0r and Ladspa support to >> >> > OpenShot. I've searched through the documentation, and I don't see >> >> > anywhere >> >> > about how to implement them. Any advice would be super helpful. >> >> > >> >> > I found this example in the XML documentation for a filter. Can >> Frei0r >> >> > and >> >> > Ladspa effects be added as filters in the XML? >> >> [..] >> >> > Also, I imagine each effect has it's own settings and parameters. I >> >> > seem to >> >> > remember reading something on the MLT website about this. Does MLT >> know >> >> > anything about these effects, such as which parameters are needed, >> valid >> >> > values, etc...? Or will I need to research each effect and determine >> >> > this? >> >> >> >> yes, but the ladspa filter currently requires an external xml file >> >> defining one or more ladspa filters. Eventually, it would be nice to >> >> be able to embed this in the MLT XML - for example, you can embed SVG >> >> in the pixbuf producer. This external xml file is the format generated >> >> by the JACK Rack program. You might take a look at the JACK Rack >> >> (requires jack sound daemon) UI and design something similar. >> >> >> >> Below is a sample jackrack XML file: >> >> <?xml version="1.0"?> >> >> <!DOCTYPE jackrack SYSTEM "http://purge.bash.sh/~rah/jack_rack_1.2.dtd<http://purge.bash.sh/%7Erah/jack_rack_1.2.dtd> >> "> >> >> <jackrack> >> >> <channels>2</channels> >> >> <samplerate>48000</samplerate> >> >> <plugin> >> >> <id>1217</id> >> >> <enabled>true</enabled> >> >> <wet_dry_enabled>false</wet_dry_enabled> >> >> <wet_dry_locked>true</wet_dry_locked> >> >> <wet_dry_values> >> >> <value>1.000000</value> >> >> <value>1.000000</value> >> >> </wet_dry_values> >> >> <lockall>true</lockall> >> >> <controlrow> >> >> <lock>true</lock> >> >> <value>25</value> >> >> <value>25</value> >> >> </controlrow> >> >> <controlrow> >> >> <lock>true</lock> >> >> <value>0.75</value> >> >> <value>0.75</value> >> >> </controlrow> >> >> <controlrow> >> >> <lock>true</lock> >> >> <value>0.69</value> >> >> <value>0.69</value> >> >> </controlrow> >> >> <controlrow> >> >> <lock>true</lock> >> >> <value>1</value> >> >> <value>1</value> >> >> </controlrow> >> >> </plugin> >> >> </jackrack> >> >> >> >> Pass the filename to a generated jackrack xml file to the filter's >> >> resource property. >> >> >> >> There is something called LADSPA RDF that contains metadata about the >> >> filters and their parameters. >> >> Command line tool `listplugins` lists the ladspa plugins. >> >> Command line tool 'analyseplugin' shows the parameters for a plugin. >> >> You might be able to find a python binding to liblrdf or a pure python >> >> RDF parser to parse the RDF yourself. Or, maybe just run these and >> >> parse their output. >> >> >> >> MLT features a metadata system similar to LADSPA that uses YAML Tiny >> >> instead of RDF format, but the query tool is built into melt. Not all >> >> MLT services support this yet, but frei0r does. 'melt -query filters' >> >> shows all of the filters. 'melt -query filter=frei0r.pixeliz0r' shows >> >> the metadata including parameters. There is an API for this metadata - >> >> see mlt++/MltRepository.h. >> >> >> >> There are frei0r producers and transitions as well. Although, I think >> >> the transitions tend to be more compositing utilities than a >> >> transition per se. >> >> >> >> Finally, along the same lines, there is a sox filter for additional >> >> audio effects. Run 'sox --help' to see a list of effects. Then, run >> >> 'sox --help-effect=echo' for the information on the effect parameters. >> >> >> >> -- >> >> +-DRD-+ >> > >> > >> > > |