[Mlt-devel] question on usage of MLT Producer

[jaromil <ja...@dy...>]

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re all,

first of all thanks for OpenMLT, it is one of the best contribution to
multimedia development for GNU folks, cheers.

i'm  developing  a   application  called  FreeJ  http://freej.dyne.org
(GPLv3)  and i would  like to  use openMLT  to re-implement  the video
layer (currently based on ffmpeg old-API) and in future take advantage
of more features in OpenMLT.

so far my attempt is limited to usage of a Producer (the avformat one)
inside FreeJ: my app runs with its own threading and can be seen as an
"external consumer"  implementation.

i  am  trying  to instantiate  a  producer  for  direct usage  in  the
simpliest way possible, proceeding as follows:


  mlt_factory_init( NULL );
...
  mlt_factory_producer( NULL, file );
...
  mlt_producer_optimise( producer );
  int w = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( producer ), "width");
  int h = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( producer ), "height");
...
  mlt_image_format format = mlt_image_yuv422;
  (producer->get_frame)(producer, &frame, 0);
  mlt_frame_get_image( frame, &image, &format, (int*)&geo.w, (int*)&geo.h, 0 );
  mlt_convert_yuv422_to_rgb24a( image, (uint8_t*)buffer, geo.w * geo.h);
  mlt_frame_close( frame );


but  that leads  just to  a block  at the  (producer->get_frame) call,
taking 100%  of CPU and  sometimes leading to the  following get_image
call which hangs my computer. I also tried embedding the producer into
a  service, obtaining the  frame from  the service  API, but  then the
pthread lock() call its doing hangs everything.

i'd be very  grateful if anyone can point me out  what i'm missing, so
far i spent two days studying the OpenMLT sources (very well written!)
but i couldn't understand what the mlt_consumer is doing that i don't.

thanks in advance for your precious advices,
ciao

- -- 
  Jaromil, dyne.org developer, http://jaromil.dyne.org

GPG: 779F E8B5 47C7 3A89 4112  64D0 7B64 3184 [ B534 0B5E ]

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