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#7 Ambience
16 octobre 2011, par
Mis à jour : Juin 2015
Langue : English
Type : Audio
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16 octobre 2011, par
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Mis à jour : Février 2013
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Sur d’autres sites (6125)
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FFMpeg process created from Java on CentOS doesn't exit
21 juin 2017, par DonzI need to convert a lot of wave files simultaneously. About 300 files in parallel. And new files come constantly. I use ffmpeg process call from my Java 1.8 app, which is running on CentOS. I know that I have to read error and input streams for making created process from Java possible to exit.
My code after several expirements :
private void ffmpegconverter(String fileIn, String fileOut){
String[] comand = new String[]{"ffmpeg", "-v", "-8", "-i", fileIn, "-acodec", "pcm_s16le", fileOut};
Process process = null;
BufferedReader reader = null;
try {
ProcessBuilder pb = new ProcessBuilder(comand);
pb.redirectErrorStream(true);
process = pb.start();
//Reading from error and standard output console buffer of process. Or it could halts because of nobody
//reads its buffer
reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String s;
//noinspection StatementWithEmptyBody
while ((s = reader.readLine()) != null) {
log.info(Thread.currentThread().getName() + " with fileIn " + fileIn + " and fileOut " + fileOut + " writes " + s);
//Ignored as we just need to empty the output buffer from process
}
log.info(Thread.currentThread().getName() + " ffmpeg process will be waited for");
if (process.waitFor( 10, TimeUnit.SECONDS )) {
log.info(Thread.currentThread().getName() + " ffmpeg process exited normally");
} else {
log.info(Thread.currentThread().getName() + " ffmpeg process timed out and will be killed");
}
} catch (IOException | InterruptedException e) {
log.error(Thread.currentThread().getName() + "Error during ffmpeg process executing", e);
} finally {
if (process != null) {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
log.error("Error during closing the process streams reader", e);
}
}
try {
process.getOutputStream().close();
} catch (IOException e) {
log.error("Error during closing the process output stream", e);
}
process.destroyForcibly();
log.info(Thread.currentThread().getName() + " ffmpeg process " + process + " must be dead now");
}
}
}If I run separate test with this code it goes normally. But in my app I have hundreds of RUNNING deamon threads "process reaper" which are waiting for ffmpeg process finish. In my real app ffpmeg is started from timer thread. Also I have another activity in separate threads, but I don’t think that this is the problem. Max CPU consume is about 10%.
Here is that I usual see in thread dump :
"process reaper" #454 daemon prio=10 os_prio=0 tid=0x00007f641c007000 nid=0x5247 runnable [0x00007f63ec063000]
java.lang.Thread.State: RUNNABLE
at java.lang.UNIXProcess.waitForProcessExit(Native Method)
at java.lang.UNIXProcess.lambda$initStreams$3(UNIXProcess.java:289)
at java.lang.UNIXProcess$$Lambda$32/2113551491.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)What am I doing wrong ?
UPD :
My app accepts a lot of connects with voice traffic. So I have about 300-500 another "good" threads in every moment. Could it be the reason ? Deamon threads have low priority. But I don’t beleive that they really can’t do their jobs in one hour. Ususally it takes some tens of millis.UPD2 :
My synthetic test that runs fine. I tried with new threads option and without it just with straigt calling of run method.import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
public class FFmpegConvert {
public static void main(String[] args) throws Exception {
FFmpegConvert f = new FFmpegConvert();
f.processDir(args[0], args[1], args.length > 2);
}
private void processDir(String dirPath, String dirOutPath, boolean isNewThread) {
File dir = new File(dirPath);
File dirOut = new File(dirOutPath);
if(!dirOut.exists()){
dirOut.mkdir();
}
for (int i = 0; i < 1000; i++) {
for (File f : dir.listFiles()) {
try {
System.out.println(f.getName());
FFmpegRunner fFmpegRunner = new FFmpegRunner(f.getAbsolutePath(), dirOut.getAbsolutePath() + "/" + System.currentTimeMillis() + f.getName());
if (isNewThread) {
new Thread(fFmpegRunner).start();
} else {
fFmpegRunner.run();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
class FFmpegRunner implements Runnable {
private String fileIn;
private String fileOut;
FFmpegRunner(String fileIn, String fileOut) {
this.fileIn = fileIn;
this.fileOut = fileOut;
}
@Override
public void run() {
try {
ffmpegconverter(fileIn, fileOut);
} catch (Exception e) {
e.printStackTrace();
}
}
private void ffmpegconverter(String fileIn, String fileOut) throws Exception{
String[] comand = new String[]{"ffmpeg", "-i", fileIn, "-acodec", "pcm_s16le", fileOut};
Process process = null;
try {
ProcessBuilder pb = new ProcessBuilder(comand);
pb.redirectErrorStream(true);
process = pb.start();
//Reading from error and standard output console buffer of process. Or it could halts because of nobody
//reads its buffer
BufferedReader reader =
new BufferedReader(new InputStreamReader(process.getInputStream()));
String line;
//noinspection StatementWithEmptyBody
while ((line = reader.readLine()) != null) {
System.out.println(line);
//Ignored as we just need to empty the output buffer from process
}
process.waitFor();
} catch (IOException | InterruptedException e) {
throw e;
} finally {
if (process != null)
process.destroy();
}
}
}
}UPD3 :
Sorry, I forgot to notice that I see the work of all these process - they created new converted files but anyway don’t exit. -
Why Matomo is a serious alternative to Google Analytics 360
12 décembre 2018, par Jake Thornton — Marketing