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lavfi/pad: fix horizontal/vertical shift confusion.
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@ -282,7 +282,7 @@ static int buffer_needs_copy(PadContext *s, AVFrame *frame, AVBufferRef *buf)
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int vsub = s->draw.vsub[planes[i]];
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uint8_t *start = frame->data[planes[i]];
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uint8_t *end = start + (frame->height >> hsub) *
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uint8_t *end = start + (frame->height >> vsub) *
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frame->linesize[planes[i]];
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/* amount of free space needed before the start and after the end
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@ -301,9 +301,9 @@ static int buffer_needs_copy(PadContext *s, AVFrame *frame, AVBufferRef *buf)
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#define SIGN(x) ((x) > 0 ? 1 : -1)
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for (j = 0; j < FF_ARRAY_ELEMS(planes) && planes[j] >= 0; j++) {
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int hsub1 = s->draw.hsub[planes[j]];
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int vsub1 = s->draw.vsub[planes[j]];
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uint8_t *start1 = frame->data[planes[j]];
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uint8_t *end1 = start1 + (frame->height >> hsub1) *
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uint8_t *end1 = start1 + (frame->height >> vsub1) *
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frame->linesize[planes[j]];
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if (i == j)
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continue;
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