[FFmpeg-devel] [PATCH v3] doc/filters: add 4x4 layout example for xstack filter

[Limin Wang]

On Tue, Sep 24, 2019 at 09:22:13PM +0530, Gyan wrote:
> 
> 
> On 24-09-2019 06:20 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 | 34 +++++++++++++++++++++++++++++++++-
> >  1 file changed, 33 insertions(+), 1 deletion(-)
> >
> >diff --git a/doc/filters.texi b/doc/filters.texi
> >index e41384aed8..9e76af36a3 100644
> >--- a/doc/filters.texi
> >+++ b/doc/filters.texi
> >@@ -19057,6 +19057,11 @@ terminates. Default value is 0.
> >  @itemize
> >  @item
> >  Display 4 inputs into 2x2 grid.
> >+
> >+Below is the 4 inputs position:
> >+input1(0, 0)    | input3(w0, 0)
> >+input2(0, h0)   | input4(w0, h0)
> >+
> >  Note that if inputs are of different sizes unused gaps might appear,
> >  as not all of output video is used.
> >  @example
> >@@ -19065,6 +19070,10 @@ 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:
> >+input1(0, 0) | input2(0, h0) | input3(0, h0+h1) | input4(0, h0+h1+h2)
> >+
> >  Note that if inputs are of different sizes unused gaps might appear,
> >  as not all of output video is used.
> >  @example
> >@@ -19073,11 +19082,34 @@ xstack=inputs=4:layout=0_0|0_h0|0_h0+h1|0_h0+h1+h2
> >  @item
> >  Display 9 inputs into 3x3 grid.
> >+
> >+Below is the 9 inputs position:
> >+input1(0, 0)          |  input4(w0, 0)        | input7(w0+w1, 0)
> >+input2(0, h0)         |  input5(w0, h0)       | input8(w0+w1, h0)
> >+input3(0, h0+h1)      |  input6(w0, h0+h1)    | input9(w0+w1, h0+h1)
> >+
> >  Note that if inputs are of different sizes unused gaps might appear,
> >  as not all of output video is used.
> >  @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
> >+xstack=inputs=9:layout=0_0|0_h0|0_h0+h1|w0_0|w0_h0|w0_h0+h1|w0+w1_0|w0+w1_h0|w0+w1_h0+h1
> >  @end example
> >+
> >+ at item
> >+Display 16 inputs into 4x4 grid.
> >+
> >+Below is the 16 inputs position:
> >+input1(0, 0)        |  input5(w0, 0)        | input9 (w0+w1, 0)        | input13(w0+w1+w2, 0)
> >+input2(0, h0)       |  input6(w0, h0)       | input10(w0+w1, h0)       | input14(w0+w1+w2, h0)
> >+input3(0, h0+h1)    |  input7(w0, h0+h1)    | input11(w0+w1, h0+h1)    | input15(w0+w1+w2, h0+h1)
> >+input4(0, h0+h1+h2) |  input8(w0, h0+h1+h2) | input12(w0+w1, h0+h1+h2) | input16(w0+w1+w2, h0+h1+h2)
> >+
> >+Note that if inputs are of different sizes unused gaps might appear,
> >+as not all of output video is used.
> >+ 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+w1_0|\
> >+w0+w1_h0|w0+w1_h0+h1|w0+w1_h0+h1+h2|w0+w1+w2_0|w0+w1+w2_h0|w0+w1+w2_h0+h1|w0+w1+w2_h0+h1+h2
> >+ at end example
> >+
> >  @end itemize
> >  @anchor{yadif}
> 
> I tested the HTML and manual output and linebreaks aren't honoured.
> Even with manual linebreaks, the grid isn't aligned. You should
> manually set and test it.
Sorry, I'm not familar with the format, I have used "@example" tage to
fix it. HTML and man output are tested and I feel it's good to read,
please check the updated patch.

> 
> Gyan
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