On Thu, Apr 17, 2014 at 11:11 AM, James N. Hart <
james.h...@schneider-electric.com> wrote:
> Thanks for the links Dan they are sure to come in useful. Cross compiling
> seems like the quickest path if I need to modify the existing sources or
> plugins.
>
>
>
> Is there an existing easy path to make changes to existing plugins without
> involving the whole build framework and configure tools in every
> developer’s windows environment?
>
>
>
> One can use the cross-compile environment to create a so-called SDK build
> by running the build-shotcut.sh script with the -s option (in addition to
> -o Win32). It creates a zip file that you copy to Windows and extract. At
> this point, one could work on a plugin by simply copying the MLT includes
> and DLL libs into your own project, or make your project build setup
> reference the ones in the extracted SDK. You will need to use a MinGW-based
> tool chain as I think the binaries are incompatible with MSVC.
> SetupWindowsDev shows how I enhance Qt Creator with Git Bash to get a
> usable command line environment in addition to the IDE.
>
>
>
> Basically, at this time there is nothing really easy to build everything
> on Windows. Even our cross-compile and Windows build tips for MLT uses some
> pre-built binaries for dependencies. If you can use prebuilt MLT binaries
> and just work on plugins, then it is much easier. I can upload a pre-built
> SDK if you want. After you make a plugin, you must copy it into proper
> place for MLT and (q)melt to find it. You add a deployment step as part of
> your project's build to simplify the dev-test cycle.
>
>
>
> Yes, please upload a prebuilt SDK. Will it include the dependent
> libraries such as qt and ffmpeg? Can we get a new SDK upload on a
> continuous basis with new releases?
>
I have decided that I am only going to provide builds, improvements, and
support for a SDK to people and organizations who have purchased a support
contract.
>
>
> If this feature isn’t available, ideally I would like to modify an
> existing filter to support this. Given the current difficulty with the
> build framework in windows, first pass I’d like to just create a custom
> filter which can influence something like the watermark’s filter output
> each frame. This would allow me to easily create a pipeline or xml that
> can be passed to qmelt. Is there an existing filter service which
> overlays text that I can influence some text property every frame with a
> custom filter placed before it? It seems like a simple enough use case,
> but it is unclear to me with the existing doc’s if I can influence
> something like that every single frame with any existing service. Any
> suggestions?
>
>
>
> You can use dynamictext, which prioritizes qtext over pango. It might be
> as simple as adding a property to dynamictext to set the base date/time and
> a new substitution keyword to compute a time based on base time, frame
> number, and frame rate.
>
>
>
> I think I will try that approach as part of learning the code base.
> However, without modifying the current dynamictext implementation, could I
> create a new custom filter plugin inserted prior to dynamictext which can
> change the text dynamictext displays each frame?
>
>
>
> Thanks,
>
> James
>
>
>
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