Java调用linux命令ffmpeg视频转码
Java调用linux命令ffmpeg视频转码java.io.*;import java.lang.*;import java.util.*;import java.text.*;import java.net.*;public class MediocreExecJavac{ //运行命令 public void runCmd(String command){try { Runtime rt = Runtime.getRuntime(); Process proc = rt.exec(command); InputStream stderr = proc.getErrorStream(); InputStreamReader isr = new InputStreamReader(stderr); BufferedReader br = new BufferedReader(isr); String line = null; System.out.println("<ERROR>"); while ( (line = br.readLine()) != null) System.out.println(line); System.out.println("</ERROR>"); int exitVal = proc.waitFor(); System.out.println("Process exitValue: " + exitVal); } catch (Throwable t){ t.printStackTrace();} }//视频转码，infile输入文件(包括完整路径)，outfile输出文件 public boolean transfer(String infile,String outfile){String avitoflv = "ffmpeg -i "+infile+" -ar 22050 -ab 56 -f flv -y -s 320x240 "+outfile;String flvto3gp = "ffmpeg -i " + infile + " -ar 8000 -ac 1 -acodec amr_nb -vcodec h263 -s 176x144 -r 12 -b 30 -ab 12 " + outfile;String avito3gp = "ffmpeg -i " + infile + " -ar 8000 -ac 1 -acodec amr_nb -vcodec h263 -s 176x144 -r 12 -b 30 -ab 12 " + outfile;//avi -> jpgString avitojpg = "ffmpeg -i " + infile + " -y -f image2 -ss 00:00:10 -t 00:00:01 -s 350x240 " + outfile;try { Runtime rt = Runtime.getRuntime(); Process proc = rt.exec(avitoflv); InputStream stderr = proc.getErrorStream(); InputStreamReader isr = new InputStreamReader(stderr); BufferedReader br = new BufferedReader(isr); String line = null; System.out.println("<ERROR>"); while ( (line = br.readLine()) != null) System.out.println(line); System.out.println("</ERROR>"); int exitVal = proc.waitFor(); System.out.println("Process exitValue: " + exitVal); } catch (Throwable t){ t.printStackTrace(); return false;}return true; }//读取文件,fileName输入文件，id行数 public static String readFile(String fileName,int id) {String dataStr = "";FileInputStream fis = null;try{ FileReader file = new FileReader(fileName);//建立FileReader对象，并实例化为fr BufferedReader br=new BufferedReader(file);//建立BufferedReader对象，并实例化为br int i=1; String Line=br.readLine();//从文件读取一行字符串 //System.out.println("Line1="+Line+"="+Line); //判断读取到的字符串是否不为空 //while(Line!=null){ //System.out.println(Line + "<br>");//输出从文件中读取的数据 //if(i==line){dataStr=Line;break;}else{i=i+1;} //Line=br.readLine();//从文件中继续读取一行数据 //} dataStr=Line; br.close();//关闭BufferedReader对象}catch(Exception e){}finally{ try { if(fis!=null) fis.close(); }catch(Exception e){}}return dataStr; } //读时长信息 public String readtime(String file) {String str="/opt/cgogo/test/info.txt";String timelen = "";String cmd = "timelen "+file;runCmd(cmd);timelen=readFile(str,1);return timelen; } public static void main(String args[]) {MediocreExecJavac me = new MediocreExecJavac();String infile = "/opt/cgogo/test/02.avi";String outfile = "01.flv";//时长String timelen = me.readtime(infile);System.out.println("02.avi timelen is :" + timelen);//转码if(me.transfer(infile,outfile)){ System.out.println("the transfer is ok!");}else{ System.out.println("the transfer is error!");} }}
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