[FFmpeg-devel] flashsvenc.c path - fix ability to handle negative linesize

[Jason Askew]

M?ns Rullg?rd -
> It's useful to think of it as data[0] pointing to the top-left pixel,
> wherever it is in the buffer.  Adding linesize takes you one line down
> in the image, and so on.

Useful, but also not true in this case.  The formula
data[y*linesize+x] holds valid, but in this case the memcpy fails
because the pointer isn't pointing at the start of the memory buffer.
Navigation and copying code must compensate for it.

[...]
>
> Well getting the patches to an acceptable state is half the fun :)
> Anyway I'll merge it manually. Try getting it right the next time.
>
> MvH
> Benjamin Larsson
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>

Thank you.  I'm willing to learn, I want to contribute, and I'm
willing to take my ego out of it.    I'll keep contributing, you guys
keep criticizing, and eventually I'll get it.  Thanks Benjamin!