From c78323d8e7aa47e56a8ad59ce618d08b438212a7 Mon Sep 17 00:00:00 2001 From: Andrew Weaver Date: Wed, 2 Jan 2019 19:23:18 -0800 Subject: [PATCH] clarifications --- index.html | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/index.html b/index.html index c7aedbe..717513d 100644 --- a/index.html +++ b/index.html @@ -1704,9 +1704,9 @@
ffplay
starts the command
-f lavfi -i testsrc
tells ffplay to use the Libavfilter's virtual device input 'testsrc'
-vf
tells ffmpeg that you will be applying a filter chain to the input
-
split=3[a][b][c],
splits the input into three separate signals within the filter graph, named a, b and c respectively. The , separates this from the next part of the filter chain. +
split=3[a][b][c],
splits the input into three separate signals within the filter graph, named a, b and c respectively. (These are variables and any names could be used as long as they are kept consistent in following steps). The , separates this from the next part of the filter chain.
[a][b][c]xstack=inputs=3:
tells ffmpeg that you will be using the xstack filter on the three named inputs a,b and c. The final : is a necessary divider between the number of inputs, and the orientation of outputs portion of the xstack command.
-
layout=0_0|0_h0|0_h0+h1
This is where the locations of the video sources in the ouput stack are designated. The locations are specified in order of input (so in this example 0_0 corresponds to input [a]. Inputs must be separated with a |. The two numbers represent columns and rows, with counting starting at zero rather than one. In this example, 0_0 means that input [a] is placed at the first row of the first column in the output. 0_h0 places the next input in the first column, at a row corresponding with the height of the first input. 0_h0+h1 places the final input in the first column, at a row corresponding with the height of the first input plus the height of the second input. This has the effect of creating a vertical stack of the three inputs. This could be made a horizontal stack by changing this portion of the command to layout=0_0|w0_0|w0+w1_0.
+
layout=0_0|0_h0|0_h0+h1
This is where the locations of the video sources in the output stack are designated. The locations are specified in order of input (so in this example 0_0 corresponds to input [a]. Inputs must be separated with a |. The two numbers represent columns and rows, with counting starting at zero rather than one. In this example, 0_0 means that input [a] is placed at the first row of the first column in the output. 0_h0 places the next input in the first column, at a row corresponding with the height of the first input. 0_h0+h1 places the final input in the first column, at a row corresponding with the height of the first input plus the height of the second input. This has the effect of creating a vertical stack of the three inputs. This could be made a horizontal stack by changing this portion of the command to layout=0_0|w0_0|w0+w1_0.
[out]
this ends the filter chain and designates the final output.