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avcodec/utils: Document 32 min for h264 width

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Suggested-by: "Ronald S. Bultje" <rsbultje@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer
2015-07-10 18:31:42 +02:00
parent b1e242bc56
commit 47d077337a
1 changed files with 5 additions and 0 deletions
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5
libavcodec/utils.c
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@@ -432,6 +432,11 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
// some of the optimized chroma MC reads one line too much // some of the optimized chroma MC reads one line too much
// which is also done in mpeg decoders with lowres > 0 // which is also done in mpeg decoders with lowres > 0
*height += 2; *height += 2;
// H.264 uses edge emulation for out of frame motion vectors, for this
// it requires a temporary area large enough to hold a 21x21 block,
// increasing witdth ensure that the temporary area is large enough,
// the next rounded up width is 32
*width = FFMAX(*width, 32); *width = FFMAX(*width, 32);
} }