[osg-users] Plugins errors for unsupported files

[Riccardo Corsi]

Hi Robert and all,

I'm currently using the ffmpeg plugin to load some movies - it works just
fine but my application started generating a lot of errors on console like
this:
> FFmpegImageStream::open : av_open_input_file() failed : AVERROR_NOENT
every time an image has to be loaded.

You can reproduce the issue with the modified osgMovie example in attach,
which also loads the textured cow model.

Digging a bit I've seen that's because the file reading mechanism tries to
read from all the already loaded plugins, reagardless of their extension(s)
support.
See here:
https://github.com/openscenegraph/OpenSceneGraph/blob/master/src/osgDB/
Registry.cpp#L1176

I thought that the extension supported by each plugin was checked before
trying to use it.
Besides the annoying errors on the console, wouldn't it be more efficient?

Thanks,
Ricky
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