Use FFMPEG to convert the video format to FLV to ensure successful operation

/*** Video conversion (converted to FLV format) ** Creation Time: 2010-11-21 */public class testconvert {/** input file path attribute */private string in_path; /** output file path attribute */private string out_path;/** ffmpeg.exe storage path attribute */private string ffmpeg_path;/** completion progress attribute */private int complete = 0; /** constructor */Public testconvert (string inpath, string outpath, string ffmpegpath) {This. in_path = inpath; // value the path of the video file to be converted. This. out_path = outpath; // The FLV file path generated by the value assignment conversion. This. ffmpeg_path = ffmpegpath; // assign a value to the external Program Directory where FFmpeg is located}/** main method (TEST) */public static void main (string [] ARGs) {testconvert convert = new testconvert ("E: // input //. MP4 "," E: // output // W. FLV "," E: // "); convert.exe cute (convert. toflv (); // Method for converting to FLV and adding a watermark // convert.exe cute (convert. getimage ();}/** Conversion Method */Public void execute (list <string> List) {processbuilder builder = new processbuilder (); // process builder object builder. command (list); // create a life cycle with dynamic array object parameters Make try {process Pc = builder. start (); // The thread starts the execution. // call the readinputstream method to obtain the information returned by monitoring the output stream of the process. String errormsg = readinputstream (PC. geterrorstream (), "error"); string outputmsg = readinputstream (PC. getinputstream (), "out"); int c = pc. waitfor (); If (C! = 0) {// If the processing process is waiting for system. out. println ("processing failed:" + errormsg);} else {system. out. println (this. complete + outputmsg);} catch (exception e) {system. out. println ("exception occurred during conversion processing") ;}/ ** create the command to convert to FLV */public list <string> toflv () {list <string> commend = new arraylist <string> (); // used for video conversion to FLV parameter setting // set the ffmpeg.exe path to commend. add (this. ffmpeg_path + "ffmpeg.exe"); commend. add ("-I"); // sets the commen of the file to be input. D. add (this. in_path); // location of the file to be input commend. add ("-y"); // overwrite the commend file of the same name in the output directory. add ("-acodec"); // sets the Audio Encoding mode commend. add ("libmp 3lame"); // The encoding method is MP3, which can be libmp 3lame or AAC commend. add ("-AR"); // sets the audio sampling frequency commend. add ("22050"); // The audio sampling rate can be set to 22050, 24000, 44100, or 48000 commend. add ("-qscale"); // sets the Dynamic Bit Rate commend. add ("6"); // The test shows that if you want to get high-quality videos, the smaller the value, the better commend. add (this. out_path); // set the output FLV file path return commend;}/** video creation command */Public list <string> getimage () {list <string> commend = new arraylist <string> (); // set commend for video parameters. add (this. ffmpeg_path + "FFMPEG"); // sets the location of the converter to commend. add ("-I"); // sets the commend of the file to be input. add (this. out_path); // location of the file to be input commend. add ("-y"); // overwrite the commend file of the same name in the output directory. add ("-F"); // output file format commend. add ("image2"); // JPG format commend. add ("-SS"); // you can switch the task commend from a specified time point. add ("8"); // commend from the video's 8th seconds. add ("-T "); // Set the record time commend. add ("1"); // The record time is 1 second commend. add ("-s"); // output image resolution commend. add ("200x200"); // picture size commend. add (this. out_path.substring (0, this. out_path.lastindexof (". ") + ". jpg "); // set the output file directory return commend;}/** the percentage of progress returned by monitoring the output stream of the process */private string readinputstream (inputstream is, string f) throws ioexception {// encapsulate the output stream of the process into a buffer reader object bufferedreader BR = new bufferedreader (New inputstreamread Er (is); stringbuffer lines = new stringbuffer (); // construct a variable string long totaltime = 0; // loop each row of the buffer reader object for (string line = BR. readline (); line! = NULL; line = BR. readline () {lines. append (line); // Add each line of Information string to the variable string int positionduration = line. indexof ("Duration:"); // locate int positiontime = line for the first "Duration:" in the current row. indexof ("time ="); If (positionduration> 0) {// if the current row contains "Duration:" string dur = line. replace ("Duration:", ""); // Replace "Duration:" in the current row with "" dur = dur. trim (). substring (0, 8); // removes the spaces at the beginning and end of the replaced string, and truncates the first eight characters, int H = integer. parseint (dur. substring (0, 2); // encapsulated into an hour int M = integer. parseint (dur. substring (3, 5); // encapsulated into minutes int S = integer. parseint (dur. substring (6, 8); // encapsulated into seconds totaltime = H * 3600 + M * 60 + S; // obtain the total time in seconds} If (positiontime> 0) {// if the time string used exists // extract the current time string containing time = string time = line. substring (positiontime, line. indexof ("bitrate")-1); time = time. substring (time. indexof ("=") + 1, time. indexof (". "); // capture the current time string float t = (float) Long. parselong (time)/(float) totaltime; // calculate the ratio of the time used to the total time required this. complete = (INT) math. ceil (T * 100); // percentage of computing completion progress} system. out. println ("Finished:" + this. complete + "%");} BR. close (); // close the output stream of the Process return lines. tostring ();}}
 
 
Post: http://blog.csdn.net/zdyfzj/article/details/6050541