之前用過一個Java的encoder/decoder叫做transform-swf，可以直接下載他的jar檔來用：transform-3.0.2.jar

他號稱可以支援到Flash 10，不過因為是五六年前的東西，我不敢保證是否能正確剖析最新的swf檔。

簡單的剖析swf中的影像(ExtractAvm1.java)：

import java.io.*;
import java.util.*;
import java.util.zip.*;
import java.util.regex.*;
import com.flagstone.transform.*;
import com.flagstone.transform.movieclip.*;
import com.flagstone.transform.image.*;

public class ExtractAvm1 {
    public static void main(String[] args) throws IOException, DataFormatException {
        FileInputStream input = new FileInputStream(args[0]);
        Movie movie = new Movie();
        movie.decodeFromStream(input);
        List<MovieTag> tags = movie.getObjects();
        Iterator<MovieTag> iterator = tags.iterator();
        while(iterator.hasNext()) {
            MovieTag tag = iterator.next();
            String s = tag.toString();
            if(s.indexOf("DefineJPEGImage4") > -1) {
                DefineJPEGImage4 tmp = (DefineJPEGImage4)tag;
                System.out.println(tmp);
                System.out.println("\twidth: " + tmp.getWidth() + ", height: " + tmp.getHeight());
                continue;
            }
            if(s.indexOf("DefineJPEGImage3") > -1) {
                DefineJPEGImage3 tmp = (DefineJPEGImage3)tag;
                System.out.println(tmp);
                System.out.println("\twidth: " + tmp.getWidth() + ", height: " + tmp.getHeight());
                continue;
            }
            if(s.indexOf("DefineJPEGImage2") > -1) {
                DefineJPEGImage2 tmp = (DefineJPEGImage2)tag;
                System.out.println(tmp);
                System.out.println("\twidth: " + tmp.getWidth() + ", height: " + tmp.getHeight());
                continue;
            }
            if(s.indexOf("DefineJPEGImage") > -1) {
                DefineJPEGImage tmp = (DefineJPEGImage)tag;
                System.out.println(tmp);
                System.out.println("\twidth: " + tmp.getWidth() + ", height: " + tmp.getHeight());
                continue;
            }
            if(s.indexOf("DefineImage2") > -1) {
                DefineImage2 tmp = (DefineImage2)tag;
                System.out.println(tmp);
                System.out.println("\twidth: " + tmp.getWidth() + ", height: " + tmp.getHeight());
                continue;
            }
            if(s.indexOf("DefineImage") > -1) {
                DefineImage tmp = (DefineImage)tag;
                System.out.println(tmp);
                System.out.println("\twidth: " + tmp.getWidth() + ", height: " + tmp.getHeight());
                continue;
            }
        }
    }
}

編譯：

javac -cp transform-3.0.2.jar:. ExtractAvm1.java

執行：

java -cp transform-3.0.2.jar:. ExtractAvm1 xxx.swf

結果看起來會像這樣：

DefineJPEGImage: { identifier=72; image=byte<9401> ...}
	width: 240, height: 180
DefineJPEGImage2: { identifier=279; image=byte<38527> ...}
	width: 140, height: 105

另外也有花錢的工具，我比較推這個：Sothink SWF Decompiler