[FFmpeg-devel] [PATCH v6] doc/filters: add 4x4 layout example for xstack filter

[Limin Wang]

On Thu, Sep 26, 2019 at 09:50:16PM +0530, Gyan wrote:
> 
> 
> On 26-09-2019 08:27 PM, lance.lmwang at gmail.com wrote:
> >From: Limin Wang <lance.lmwang at gmail.com>
> >
> >Reviewed-by: Gyan <ffmpeg at gyani.pro>
> >Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> >---
> >  doc/filters.texi | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
> >  1 file changed, 52 insertions(+), 3 deletions(-)
> >
> >diff --git a/doc/filters.texi b/doc/filters.texi
> >index e6f8bf0..581a96b 100644
> >--- a/doc/filters.texi
> >+++ b/doc/filters.texi
> >@@ -19060,6 +19060,13 @@ terminates. Default value is 0.
> >  @itemize
> >  @item
> >  Display 4 inputs into 2x2 grid.
> >+
> >+Below is the 4 inputs position:
> >+ at example
> >+input1(0, 0)  | input3(w0, 0)
> >+input2(0, h0) | input4(w0, h0)
> >+ at end example
> >+
> >  Note that if inputs are of different sizes unused gaps might appear,
> >  as not all of output video is used.
> >  @example
> >@@ -19068,6 +19075,15 @@ xstack=inputs=4:layout=0_0|0_h0|w0_0|w0_h0
> >  @item
> >  Display 4 inputs into 1x4 grid.
> >+
> >+Below is the 4 inputs position:
> >+ at example
> >+input1(0, 0)
> >+input2(0, h0)
> >+input3(0, h0+h1)
> >+input4(0, h0+h1+h2)
> >+ at end example
> >+
> >  Note that if inputs are of different sizes unused gaps might appear,
> >  as not all of output video is used.
> >  @example
> >@@ -19076,11 +19092,44 @@ xstack=inputs=4:layout=0_0|0_h0|0_h0+h1|0_h0+h1+h2
> >  @item
> >  Display 9 inputs into 3x3 grid.
> >-Note that if inputs are of different sizes unused gaps might appear,
> >-as not all of output video is used.
> >+
> >+Below is the 9 inputs position:
> >  @example
> >-xstack=inputs=9:layout=w3_0|w3_h0+h2|w3_h0|0_h4|0_0|w3+w1_0|0_h1+h2|w3+w1_h0|w3+w1_h1+h2
> >+input1(0, 0)       | input4(w0, 0)      | input7(w0+w3, 0)
> >+input2(0, h0)      | input5(w0, h0)     | input8(w0+w3, h0)
> >+input3(0, h0+h1)   | input6(w0, h0+h1)  | input9(w0+w3, h0+h1)
> >  @end example
> >+
> >+Note that if the input size is different, there may be unused gaps or
> >+overlaps.  For example, if the height of input4 is greater than input1,
> >+input5 will overlaid the top of input4, if the width of input5 is less
> >+than input4, then input5 will have unused gaps.
> >+
> >+ at example
> >+xstack=inputs=9:layout=0_0|0_h0|0_h0+h1|w0_0|w0_h0|w0_h0+h1|w0+w3_0|w0+w3_h0|w0+w3_h0+h1
> >+ at end example
> >+
> >+ at item
> >+Display 16 inputs into 4x4 grid.
> >+
> >+Below is the 16 inputs position:
> >+ at example
> >+input1(0, 0)       | input5(w0, 0)       | input9 (w0+w4, 0)       | input13(w0+w4+w8, 0)
> >+input2(0, h0)      | input6(w0, h0)      | input10(w0+w4, h0)      | input14(w0+w4+w8, h0)
> >+input3(0, h0+h1)   | input7(w0, h0+h1)   | input11(w0+w4, h0+h1)   | input15(w0+w4+w8, h0+h1)
> >+input4(0, h0+h1+h2)| input8(w0, h0+h1+h2)| input12(w0+w4, h0+h1+h2)| input16(w0+w4+w8, h0+h1+h2)
> >+ at end example
> >+
> >+Note that if the input size is different, there may be unused gaps or
> >+overlaps. For example, if the height of input5 is greater than input1,
> >+input6 will overlaid the top of input5, if the width of input6 is less
> >+than input5, then input6 will have unused gaps.
> >+
> >+ at example
> >+xstack=inputs=16:layout=0_0|0_h0|0_h0+h1|0_h0+h1+h2|w0_0|w0_h0|w0_h0+h1|w0_h0+h1+h2|w0+w4_0|
> >+w0+w4_h0|w0+w4_h0+h1|w0+w4_h0+h1+h2|w0+w4+w8_0|w0+w4+w8_h0|w0+w4+w8_h0+h1|w0+w4+w8_h0+h1+h2
> >+ at end example
> >+
> >  @end itemize
> >  @anchor{yadif}
> 
> Pushed with minor changes as af007e36d1590d431282fd760175d92f631dc48f

Gyan, thanks, I think the current layout is difficult to understand for user, how do you think if
I will change implementaion of the layout with the following setting?
1x2, 2x1, 2x2, 3x3, 4x4, 5x5 ...

> 
> Thanks,
> Gyan
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