This fixes issue 744

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improving readability.

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corresponding count is zero, rather than allocate a 16 bytes sized
block for them. Improve safety.

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libtheora is enabled.

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Patch by Michael Kostylev <mik at it-1 dot ru>

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avfilter_draw_slice() when the draw_slice callback is not defined in
the input pad.

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Fixes issue719.

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should be calculated from current frame dimensions

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