The affine filter does not set any of the "transition.*" or "use_normalized" properties when it is initialized. You need to set them yourself:https://github.com/mltframework/mlt/blob/master/src/modules/plus/filter_affine.c#L157
In the absence of setting the "transition.*" properties, the encapsulated affine transition will use its own default parameters. But those are not reflected by the affine filter automatically:https://github.com/mltframework/mlt/blob/master/src/modules/plus/transition_affine.c#L694 In the absence of setting the "use_normalized" property, the properties object will return "0" (false):https://github.com/mltframework/mlt/blob/9c3bb7d997a78fed3142c2ef95988623d21dce15/src/modules/plus/filter_affine.c#L98 ~Brian On Saturday, January 1, 2022, 10:10:25 AM CST, 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:// $ 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? 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_videoimport mltimport oslet f = initFactory("/usr/lib/mlt-7") # Create the consumerlet p = newProfile("hdv_720_50p")var sdl = newFactoryConsumer(p, "sdl2") sdl["terminate_on_pause"] = 1 # Stop the consumer when finished # Create via the default producervar clip1 = p.newMedia( "./resources/sygic.mp4") var filter = newFactoryFilter(p, "affine")filter["transition.fill"] = 1filter["transition.distort"] = 0filter["transition.rect"] = "339.703 126.468 1430.3 953.532 1"filter["transition.valign"] = "middle"filter["transition.halign"] = "center"filter["transition.threads"] = 0filter["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, osvar f = initFactory() # Create the default consumervar p = newProfile()var sdl = newFactoryConsumer(p, "sdl2") # Create via the default producervar clip = newFactoryProducer(p, resource = "avformat:/home/jose/Descargas/sygic.mp4") var filter = newFactoryFilter(p, "frei0r.pixeliz0r")filter["BlockSizeX"] = 0.1filter["BlockSizeY"] = 0.2 clip.attach( filter )clip > sdl # Start the consumersdl.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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