在代码中利用ffmpeg命令行，生成gif动态图片

C#代码：

public IEnumerator mixGIF(){
Debug.Log ("mixGIF");
gifName="Prefabs [current].name";
path="Assets/../StreamingAssets/effectAttackScreenshot/";

System.Diagnostics.ProcessStartInfo proc = new System.Diagnostics.ProcessStartInfo ();
proc.FileName = "/bin/bash";
proc.UseShellExecute = false;
proc.RedirectStandardOutput = true;
proc.CreateNoWindow = true;

proc.Arguments = string.Format ("Assets/unreal_bundle/Controller/EffectAttackController/shell/generateGIF.sh {0}{1}/gif%d.jpg {2}GIF/{3}.gif", path, gifName, path, gifName);

System.Diagnostics.Process p = System.Diagnostics.Process.Start (proc);
p.WaitForExit ();
p.Close ();
yield return 1;
}

generateGIF.sh文件：

#!/bin/bash

#palette="/tmp/palette.png"

#filters="fps=15,scale=220:-1:flags=lanczos"
#setpts=0.5*PTS
#paletteops="stats_mode=diff:dither=none"
#/usr/local/bin/ffmpeg -v warning -i $1 -vf "$filters,palettegen" -y $palette
#/usr/local/bin/ffmpeg -v warning -i $1 -i $palette -lavfi "$filters [x]; [x][1:v] paletteuse" -y $2
#/usr/local/bin/ffmpeg -i $2 -i $3 -filter_complex '[1:v]scale=100:40[s];[0:v][s]overlay=main_w-overlay_w:main_h-overlay_h' -y $2

palette="/tmp/palette.png"

filters="fps=15,scale=440:-1:flags=lanczos"
#paletteops="stats_mode=diff:dither=none"
/usr/local/bin/ffmpeg -y -v warning -i $1 -vf "$filters,palettegen" -y $palette
/usr/local/bin/ffmpeg -y -v warning -i $1 -i $palette -lavfi "$filters [x]; [x][1:v] paletteuse" -y $2