// The input video files are split into chunks of 64MB here...
public void map(Object key, Text value, Context context)
throws IOException, InterruptedException {
String line = value.toString();
System.out.println("job1:mapInp:-" + line);
String[] info = line.split(" ");
info[0] = info[0].trim();
info[1] = info[1].trim();
String lstfnames = "", fname = "";
try {
Configuration config = new Configuration();
FileSystem hdfs = FileSystem.get(config);
String prefixPath = "", fnm = "";
Pattern x = Pattern.compile("(.*)/(.*)");
Matcher xm = x.matcher(info[0]);
while (xm.find()) {
prefixPath = xm.group(1);
fnm = xm.group(2);
}
String dst = "/home/" + fnm; // dst is path of the file on local system.
hdfs.copyToLocalFile(new Path(info[0]), new Path(dst));
Process p = Runtime.getRuntime().exec("ffmpeg -i " + dst);
String s;
BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));
Pattern D = Pattern.compile("Duration:[ ]*([0-9]+):([0-9]+):([0-9]+)");
long time = 0; // "time" is the duration of the input video file
long sps = 0; // "sps" is the number of seconds(duration) of each video split
while ((s = stdError.readLine()) != null) {
Matcher md = D.matcher(s);
while (md.find()) {
time =
Long.parseLong(md.group(1)) * 3600
+ Long.parseLong(md.group(2)) * 60
+ Long.parseLong(md.group(3));
}
}
Process p1 = Runtime.getRuntime().exec("du -s " + dst);
BufferedReader stdInput1 = new BufferedReader(new InputStreamReader(p1.getInputStream()));
String s1 = "", size = ""; // "size" is the size of input video file
while ((s1 = stdInput1.readLine()) != null) {
String s11[] = s1.split("\t");
size = s11[0];
}
sps = (64 * 1024) * time / (Long.parseLong(size)); // chunk size is 64MB
String hr, min, sc;
hr = Long.toString((sps / 3600));
min = Long.toString((sps % 3600) / 60);
sc = Long.toString(sps % 60);
if (hr.length() < 2) hr = "0" + hr;
if (min.length() < 2) min = "0" + min;
if (sc.length() < 2) sc = "0" + sc;
String splt = hr + ":" + min + ":" + sc;
String query =
"mencoder -oac copy -ovc copy -ss "; // building query to split the input video file
String app = "", inpExt = "";
Pattern xx = Pattern.compile("(.*)\\.(.*)");
Matcher xxm = xx.matcher(dst);
while (xxm.find()) {
fname = xxm.group(1);
inpExt = xxm.group(2);
}
String[] tmpArr = fname.split("/");
String hdfsFname = "";
long stSrt = 0;
int cnt = 0;
while (true) {
if (stSrt > time) break;
if (stSrt + sps > time) {
long t = time - stSrt;
hr = Long.toString((t / 3600));
min = Long.toString((t % 3600) / 60);
sc = Long.toString(t % 60);
if (hr.length() < 2) hr = "0" + hr;
if (min.length() < 2) min = "0" + min;
if (sc.length() < 2) sc = "0" + sc;
splt = hr + ":" + min + ":" + sc;
}
cnt++;
hr = Long.toString((stSrt / 3600));
min = Long.toString((stSrt % 3600) / 60);
sc = Long.toString(stSrt % 60);
if (hr.length() < 2) hr = "0" + hr;
if (min.length() < 2) min = "0" + min;
if (sc.length() < 2) sc = "0" + sc;
app =
hr
+ ":"
+ min
+ ":"
+ sc
+ " -endPos "
+ splt
+ " "
+ dst
+ " -o "
+ fname
+ "_"
+ Integer.toString(cnt)
+ "."
+ inpExt;
Process p2 = Runtime.getRuntime().exec(query + app);
String ls_str = "";
DataInputStream ls_in = new DataInputStream(p2.getInputStream());
while ((ls_str = ls_in.readLine()) != null) {}
p2.destroy();
String[] tmpArr1 = fnm.split("\\.");
hdfs.copyFromLocalFile(
true,
true,
new Path(fname + "_" + Integer.toString(cnt) + "." + inpExt),
new Path(prefixPath + "/" + tmpArr1[0] + "_" + Integer.toString(cnt) + "." + inpExt));
lstfnames +=
prefixPath + "/" + tmpArr1[0] + "_" + Integer.toString(cnt) + "." + inpExt + " #!# ";
stSrt += sps;
}
Runtime rt1 = Runtime.getRuntime();
String[] cmd1 = {"/bin/bash", "-c", "rm " + dst}; // delete the file after use
Process pr1 = rt1.exec(cmd1);
pr1.waitFor();
lstfnames += "*" + info[1];
context.write(
new Text(fname),
new Text(
lstfnames)); // "fname" contains name of the input video file with
// extension(eg.".avi") removed #### "lstfnames" is a string, contains
// all the names of video splits(concatenated)
System.out.println("lstfnames : " + lstfnames);
} catch (IOException e) {
System.out.println("exception happened - here's what I know: ");
e.printStackTrace();
System.exit(-1);
}
}
// merge the converted files here
public void reduce(Text key, Iterable<Text> values, Context context)
throws IOException, InterruptedException {
System.out.println("I'm in Job2 reduce");
Configuration config = new Configuration();
FileSystem hdfs = FileSystem.get(config);
try {
String out = "";
for (Text t : values) {
out = t.toString();
out = out.trim();
System.out.println("job2:redInp:-" + out);
break;
}
String[] outl = out.split(" #!# ");
Pattern x = Pattern.compile("(.*)/(.*)\\.(.*)");
Matcher xm = x.matcher(outl[0]);
String prefixPath = "", fnm = "", ext = "";
while (xm.find()) {
prefixPath = xm.group(1);
fnm = xm.group(2);
ext = xm.group(3);
}
String foutname = fnm.split("_")[0];
foutname += "." + ext;
String query = "mencoder -oac copy -ovc copy";
int cnt = 0;
for (String st : outl) {
cnt++;
hdfs.copyToLocalFile(
true,
new Path(st),
new Path("/home/" + fnm.split("_")[0] + "_" + Integer.toString(cnt) + "." + ext));
query += " " + "/home/" + fnm.split("_")[0] + "_" + Integer.toString(cnt) + "." + ext;
}
query += " -o " + "/home/" + foutname;
Process p2 =
Runtime.getRuntime().exec(query); // query for merging the video files is executed here
String ls_str = "";
DataInputStream ls_in = new DataInputStream(p2.getInputStream());
while ((ls_str = ls_in.readLine()) != null) {}
p2.destroy();
hdfs.copyFromLocalFile(
true, true, new Path("/home/" + foutname), new Path(prefixPath + "/" + foutname));
cnt = 0;
String dlt1 = "";
for (String st3 : outl) {
cnt++;
dlt1 += " " + "/home/" + fnm.split("_")[0] + "_" + Integer.toString(cnt) + "." + ext;
}
Runtime rt1 = Runtime.getRuntime();
String[] cmd1 = {"/bin/bash", "-c", "rm" + dlt1}; // delete the files after use
Process pr1 = rt1.exec(cmd1);
pr1.waitFor();
context.write(new Text(""), new Text(prefixPath + "/" + foutname));
} catch (IOException e) {
System.out.println("exception happened - here's what I know: ");
e.printStackTrace();
System.exit(-1);
}
}
// Video splts are converted to target format here...
public void map(Object key, Text value, Context context)
throws IOException, InterruptedException {
try {
Configuration config = new Configuration();
FileSystem hdfs = FileSystem.get(config);
String st = value.toString();
st = st.trim();
System.out.println("job2:mapInp:-" + st);
String[] fmt = st.split(" #!# \\*");
String[] lst = fmt[0].split(" #!# ");
String out = "", dlt = "";
int flag = 1;
for (String st1 : lst) {
Pattern x = Pattern.compile("(.*)/(.*)");
Matcher xm = x.matcher(st1);
String prefixPath = "", fnm = "", inpExt = "";
while (xm.find()) {
prefixPath = xm.group(1);
fnm = xm.group(2);
}
String[] tmpArr = fnm.split("\\.");
fnm = tmpArr[0];
inpExt = tmpArr[1];
hdfs.copyToLocalFile(true, new Path(st1), new Path("/home/" + fnm + "." + inpExt));
String fname = "/home/" + fnm;
if (flag == 1) {
flag = 0;
out += prefixPath + "/" + fnm + "." + fmt[1];
} else {
out += " #!# " + prefixPath + "/" + fnm + "." + fmt[1];
}
if (fmt[1].equals("mpg") || fmt[1].equals("mpeg") || fmt[1].equals("mp4")) {
Process p =
Runtime.getRuntime()
.exec(
"mencoder -of mpeg -ovc lavc -lavcopts vcodec=mpeg1video -oac copy "
+ "/home/"
+ fnm
+ "."
+ inpExt
+ " -o "
+ fname
+ "."
+ fmt[1]);
String ls_str = "";
DataInputStream ls_in = new DataInputStream(p.getInputStream());
while ((ls_str = ls_in.readLine()) != null) {}
p.destroy();
dlt += " /home/" + fnm + "." + inpExt;
} else if (fmt[1].equals("avi")) {
Process p =
Runtime.getRuntime()
.exec(
"mencoder -ovc lavc -oac mp3lame -o "
+ fname
+ "."
+ fmt[1]
+ " "
+ "/home/"
+ fnm
+ "."
+ inpExt);
String ls_str = "";
DataInputStream ls_in = new DataInputStream(p.getInputStream());
while ((ls_str = ls_in.readLine()) != null) {}
p.destroy();
dlt += " /home/" + fnm + "." + inpExt;
} else {
// TBD
System.out.println("Unsupported target format!!!!!");
}
hdfs.copyFromLocalFile(
true,
true,
new Path(fname + "." + fmt[1]),
new Path(prefixPath + "/" + fnm + "." + fmt[1]));
}
Runtime rt1 = Runtime.getRuntime();
String[] cmd1 = {"/bin/bash", "-c", "rm" + dlt}; // delete the files after use
Process pr1 = rt1.exec(cmd1);
pr1.waitFor();
System.out.println("Job2 mapOut:" + out);
context.write(new Text(lst[0]), new Text(out));
System.out.println(out);
} catch (IOException e) {
System.out.println("exception happened - here's what I know: ");
e.printStackTrace();
System.exit(-1);
}
}