On Thu, May 26, 2011 at 1:34 PM, Dyogo Veiga <dyogo....@gmail.com> wrote:
> Thanks for the help but I'm still in trouble to return an image of
> mlt_frame. I need an x varival receive video content at position y.
Did you make the change to the swig binding I mentioned? If not, then
it will not work!
> This code is written in Python:
>
> import mlt
>
> mlt.Factory().init()
>
> profile = mlt.Profile()
>
> p = mlt.Producer(profile, "/home/joao/cachorros.ogg")
>
> c = mlt.Consumer(profile, "sdl")
Did I say to create a consumer? NO!
> c.set("rescale", "none")
> p.seek(1098) I stand in the video frame 1098
>
> frame = p.get_frame()
>
> image = frame.get_image()
>
> I can not return an image of the method get_image and I needed it because I
> use the frames of the video to compare with other.
>
> if possible would like your help to solve this problem.
I have obligations. I said I would work on this sometime over the next
few days. Don't push me further, or will require that you pay me for
any further assistance.
> Sorry, my english is terrible xD
>
>
>
> 2011/5/26 Dan Dennedy <d...@dennedy.org>
>>
>> On Thu, May 26, 2011 at 5:55 AM, Dyogo Veiga <dyogo....@gmail.com> wrote:
>> > What happens is that I start Factory, Producer and create the position
>> > the
>> > video without problem. I use the Python language and create a variable
>> > called frame and it receives Producer.get_frame () but when I do
>> > frame.get_image () method that asks three arguments, the height, width
>> > and
>> > format but when I pass these parameters of the error. interece grateful
>> > to
>> > help,
>>
>> The scripting languages have some limitations with passing and
>> returning binary values. In the MLT source tarball, see
>> src/swig/mlt.i. There is a special function to handle the binary image
>> return value from Frame::get_waveform() as used by
>> src/swig/python/waveforms.py. Something similar needs to be created
>> for Frame::get_image(). It does not exist yet because no one has
>> needed it. I can make a complete working python script for you, but it
>> will take a few days and you need to be prepared mlt from source.
>>
>> > I participate in a project targeting in Brazil we use the OpenCV but
>> > he has problems to place the video in ogg the mlt is the solution to
>> > finish
>> > the project. Thanks
>> >
>> > 2011/5/26 Dan Dennedy <d...@dennedy.org>
>> >>
>> >> On Wed, May 25, 2011 at 11:05 AM, Dan Dennedy <d...@dennedy.org> wrote:
>> >> > 2011/5/25 Dyogo Veiga <dyogo....@gmail.com>:
>> >> >> Good afternoon, I have a project targeting video and started to use
>> >> >> mlt
>> >> >> can
>> >> >> position the video but I can not return to a variable one frame of
>> >> >> video. If
>> >> >> someone can help me I am grateful.
>> >> >
>> >> > Exact syntax depends on your language, but in pseudo-code it looks
>> >> > like
>> >> > this:
>> >> >
>> >> > Factory.init()
>> >> > profile = new Profile("square_pal_wide") // or other
>> >> > producer = new Producer(profile, "filename")
>> >> > producer.seek(myPosition) // myPosition is a frame number
>> >> > frame = producer.get_frame()
>> >>
>> >> I forgot that there is something special you need to do here to make
>> >> some things happy:
>> >>
>> >> frame.set("consumer_aspect_ratio", profile.sar())
>> >> frame.set("consumer_deinterlace", profile.progressive())
>> >>
>> >> > format = mlt_image_rgb24 // or other
>> >> > width = 0
>> >> > height = 0
>> >> > image = frame.get_image(format, width, height)
>> >> >
>> >> > // Image contains data in packed format where stride = width *
>> >> > bytes_per_pixel depending on format.
>> >> > // You do not destroy this image buffer; the frame object manages it.
>> >> >
>> >> > // If you are using a garbage-collected language, smart pointers, or
>> >> > scoped objects, then object destruction is automatic. Otherwise, you
>> >> > need to call close functions (C) or delete (C++) your object
>> >> > pointers.
>> >> >
>> >> > Easy, eh?
>> >> >
>> >> > --
>> >> > +-DRD-+
>> >> >
>> >>
>> >>
>> >>
>> >> --
>> >> +-DRD-+
>> >
>> >
>> >
>> > --
>> > Dyogo Ribeiro Veiga
>> > Graduando em Tecnólogo em Análise e Desenvolvimento de Sistemas - 3º
>> > Período
>> > Bolsista de Iniciação Científica - Núcleo de Pesquisas em Sistemas de
>> > Informação
>> > (22) 9726-3631
>> >
>>
>>
>>
>> --
>> +-DRD-+
>
>
>
> --
> Dyogo Ribeiro Veiga
> Graduando em Tecnólogo em Análise e Desenvolvimento de Sistemas - 3º Período
> Bolsista de Iniciação Científica - Núcleo de Pesquisas em Sistemas de
> Informação
> (22) 9726-3631
>
--
+-DRD-+
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