On Sat, Jan 1, 2022 at 8:10 AM José María García Pérez < josemaria.alk...@gmail.com> wrote:
> I managed to write a pure C example, and I am getting something similar to > what I get with NIm: > But what you wrote in C is not the same as Nim. In Nim, you are setting filter properties, and in C you only getting them. Did you very your MLT build is working for your example by using the melt command line? If not, why? If you are going to just jump into the code, be prepared to debug. This works for me: melt -proifle hdv_720_50p -consumer sdl2 +hello.txt -attach affine transition.fix_rotate_x=340 > // $ gcc ex02.c -I/usr/include/mlt-7 -lmlt-7 -o ex02 > // Inspired by: > https://stackoverflow.com/questions/62983626/how-to-compile-a-simple-mlt-example-in-c > #include <stdio.h> > #include <unistd.h> > #include <framework/mlt.h> > > int main( int argc, char *argv[] ) > { > // Initialise the factory > if ( mlt_factory_init( "/usr/lib/mlt-7" ) > 0 ) > { > mlt_profile p = mlt_profile_init("hdv_720_50p"); > // Create the default consumer > mlt_consumer hello = mlt_factory_consumer( p, "sdl2", NULL ); > mlt_properties_set_int(mlt_consumer_properties(hello), > "terminate_on_pause", 1); > > // Create via the default producer > mlt_producer world = mlt_factory_producer( p, NULL, argv[ 1 ] ); > > // Create filter > mlt_filter aff = mlt_factory_filter( p, "affine", NULL ); > > mlt_properties affprop = mlt_filter_properties(aff); > for(int i=0; i<mlt_properties_count(affprop); ++i) { > printf( "%d %s",i, mlt_properties_get_name(affprop, i ) ); > printf("\n"); > } > > // if (mlt_properties_exists(mlt_filter_properties(aff), "background") > > 0) { > // printf("background exists\n"); > // } > int res = mlt_service_attach(mlt_producer_service(world), aff); > > > // Connect the producer to the consumer > mlt_consumer_connect( hello, mlt_producer_service( world ) ); > > // Start the consumer > mlt_consumer_start( hello ); > > > // Wait for the consumer to terminate > while( !mlt_consumer_is_stopped( hello ) ) > sleep( 1 ); > > // Close the consumer > mlt_consumer_close( hello ); > > // Close the producer > mlt_producer_close( world ); > > // Close the factory > mlt_factory_close( ); > } > else > { > // Report an error during initialisation > fprintf( stderr, "Unable to locate factory modules\n" ); > } > > // End of program > return 0; > } > > With this example I get: > $ gcc ex02.c -I/usr/include/mlt-7 -lmlt-7 -o ex02 > $ ./ex02 example.mp4 > 0 _events > 1 mlt_type > 2 in > 3 out > 4 background > 5 _unique_id > 6 mlt_service > 7 _profile > > As I said, I cannot see neither "transition" nor "use_normalised". What > do I need to do in C language to make them appear? > I think I told you before that a property does not actually exist until something sets it. Some filters only get a property and never set it. Also, some properties such as "transition" is a pointer that cannot be serialized. You do not need to set it; it is not published in the affine filter's docs. This C works for me #include <stdio.h> #include <unistd.h> #include <framework/mlt.h> int main( int argc, char *argv[] ) { // Initialise the factory if ( mlt_factory_init(NULL) > 0 ) { mlt_profile p = mlt_profile_init("hdv_720_50p"); // Create the default consumer mlt_consumer hello = mlt_factory_consumer( p, "sdl2", NULL ); mlt_properties_set_int(mlt_consumer_properties(hello), "terminate_on_pause", 1); // Create via the default producer mlt_producer world = mlt_factory_producer( p, NULL, argv[ 1 ] ); // Create filter mlt_filter aff = mlt_factory_filter( p, "affine", NULL ); mlt_properties_set_int(MLT_FILTER_PROPERTIES(aff), "transition.fix_rotate_x", 340); int res = mlt_service_attach(mlt_producer_service(world), aff); // Connect the producer to the consumer mlt_consumer_connect( hello, mlt_producer_service( world ) ); // Start the consumer mlt_consumer_start( hello ); // Wait for the consumer to terminate while( !mlt_consumer_is_stopped( hello ) ) sleep( 1 ); // Close the consumer mlt_consumer_close( hello ); // Close the producer mlt_producer_close( world ); // Close the factory mlt_factory_close( ); } else { // Report an error during initialisation fprintf( stderr, "Unable to locate factory modules\n" ); } // End of program return 0; } > > Kind regards, > José M. > > El vie, 31 dic 2021 a las 9:24, José María García Pérez (< > josemaria.alk...@gmail.com>) escribió: > >> I think that my problem is that I am not handling properly nested >> properties, but before that I don't see the keys a would expect for the >> "affine" filter: >> >> When I print the keys for the affine filter, I get the following: >> >> _events >> mlt_type >> in >> out >> background >> _unique_id >> mlt_service >> _profile >> >> I am not seeing neither "transition" nor "use_normalised" keys that I >> would expect in accordance with >> https://www.mltframework.org/plugins/FilterAffine/#transition. >> >> Any clue about what might be going on? >> >> >> El jue, 30 dic 2021 a las 19:53, José María García Pérez (< >> josemaria.alk...@gmail.com>) escribió: >> >>> I was expecting a rotated image. The output was the video unmodified. >>> >>> El jue, 30 dic 2021 a las 19:52, Brian Matherly (< >>> brian.mathe...@yahoo.com>) escribió: >>> >>>> > My first attempt wasn't very successful >>>> >>>> What result did you expect, and what was the actual result? >>>> >>>> On Thursday, December 30, 2021, 12:28:42 PM CST, José María García >>>> Pérez <josemaria.alk...@gmail.com> wrote: >>>> >>>> >>>> I wasn't aware about Shotcut doing so. Good to know. >>>> >>>> My first attempt wasn't very successful. I did the following: >>>> # nim c --threads:on -r ex23_loader_video >>>> import mlt >>>> import os >>>> let f = initFactory("/usr/lib/mlt-7") >>>> >>>> # Create the consumer >>>> let p = newProfile("hdv_720_50p") >>>> var sdl = newFactoryConsumer(p, "sdl2") >>>> >>>> sdl["terminate_on_pause"] = 1 # Stop the consumer when finished >>>> >>>> # Create via the default producer >>>> var clip1 = p.newMedia( "./resources/sygic.mp4") >>>> >>>> >>>> var filter = newFactoryFilter(p, "affine") >>>> filter["transition.fill"] = 1 >>>> filter["transition.distort"] = 0 >>>> filter["transition.rect"] = "339.703 126.468 1430.3 953.532 1" >>>> filter["transition.valign"] = "middle" >>>> filter["transition.halign"] = "center" >>>> filter["transition.threads"] = 0 >>>> filter["transition.fix_rotate_x"] = 340.0 >>>> >>>> #[ >>>> <property name="background">color:#00000000</property> >>>> <property name="mlt_service">affine</property> >>>> <property name="shotcut:filter">affineSizePosition</property> >>>> <property name="transition.fill">1</property> >>>> <property name="transition.distort">0</property> >>>> <property name="transition.rect">339.703 126.468 1430.3 953.532 >>>> 1</property> >>>> <property name="transition.valign">middle</property> >>>> <property name="transition.halign">center</property> >>>> <property name="shotcut:animIn">00:00:00.000</property> >>>> <property name="shotcut:animOut">00:00:00.000</property> >>>> <property name="transition.threads">0</property> >>>> <property name="transition.fix_rotate_x">340.304</property> >>>> >>>> ]# >>>> clip1.attach(filter) >>>> clip1 > sdl >>>> >>>> sdl.start # Start the consumer >>>> >>>> while not sdl.stopped: >>>> sleep(1) >>>> >>>> Do you spot something obvious that might be wrong? >>>> >>>> El jue, 30 dic 2021 a las 18:52, Dan Dennedy (<d...@dennedy.org>) >>>> escribió: >>>> >>>> You can use a tool like Shotcut and study it’s XML output to understand >>>> the properties for a filter. The affine filter is called Size, Position & >>>> Rotate. To get the XML use File > Save. >>>> >>>> On Thu, Dec 30, 2021 at 9:47 AM José María García Pérez < >>>> josemaria.alk...@gmail.com> wrote: >>>> >>>> I don't understand how to use the affine filter: >>>> https://www.mltframework.org/plugins/FilterAffine/#transition >>>> >>>> Could you post a basic C example using it? It would be nice to cover >>>> both the static and an animation case. >>>> >>>> I had the following example about using a filter using Nim: >>>> import mlt, os >>>> var f = initFactory() >>>> >>>> # Create the default consumer >>>> var p = newProfile() >>>> var sdl = newFactoryConsumer(p, "sdl2") >>>> >>>> # Create via the default producer >>>> var clip = newFactoryProducer(p, resource = >>>> "avformat:/home/jose/Descargas/sygic.mp4") >>>> >>>> var filter = newFactoryFilter(p, "frei0r.pixeliz0r") >>>> filter["BlockSizeX"] = 0.1 >>>> filter["BlockSizeY"] = 0.2 >>>> >>>> clip.attach( filter ) >>>> clip > sdl >>>> >>>> # Start the consumer >>>> sdl.start >>>> >>>> while not sdl.stopped: >>>> sleep(1) >>>> _______________________________________________ >>>> Mlt-devel mailing list >>>> Mlt-devel@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/mlt-devel >>>> >>>> _______________________________________________ >>>> Mlt-devel mailing list >>>> Mlt-devel@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/mlt-devel >>>> >>>
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