[osg-users] FFmpegImageStream thread safety

[OpenSceneGraph Users]

Hi,

I was just looking at FFmpegImageStream, I am not very familiar with this 
code, but I have some questions.

It is not immediately clear to me how FFmpegImageStream::publishNewFrame is 
thread safe.
It seems like the image data is set (setImage) from the video decoder 
thread.
The image then uses a pointer to one of the buffers of the video decoder 
(of which the contents might also change ?).

FFmpegImageStream also doesn't seem to override requiresUpdateCall, which I 
believe will result in the texture not being dynamic (Texture2D::setImage).
Which could be used, for example in StateSet::computeDataVariance(), to 
determine whether the StateSet should be dynamic (which is needed for 
multithreaded rendering).

If anyone could shed more light on this subject, it would be very much 
appreciated.

Thank you.

Cheers,

Ben

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