如何解决在Runtimeexec正常运行的情况下,ProcessBuilder在Mac上提供了“无此类文件或目录”
您需要将参数指定为单独的Strings
:
new ProcessBuilder("cmd", "arg1", "arg2", ...);
构造函数接受String
,varargs
和List<String>
。
请参阅ProcessBuilder文档。
解决方法
我有一个在Playframework上运行的应用程序,该应用程序需要对一些视频文件进行编码。我用了
Process pr = Runtime.getRuntime().exec(execCode)
为此(它完美地工作),但是由于我需要输出流和错误流,因此我尝试使用ProcessBuilder(也建议这样做)。
但是我无法使其正常工作(在MacBook上测试)。Runtime方法和ProcessBuilder之间有根本区别吗?
这是我的ProcessBuilder代码(由完全相同的代码可以工作Runtime.getRuntime().exec()
)
String execCode = "/opt/local/bin/ffmpeg -i file [...]";
ProcessBuilder pb = new ProcessBuilder(execCode);
pb.redirectErrorStream(true);
pb.directory(new File("/Users/[...]/data/"));
Process pr = pb.start();
这是控制台输出:
11:00:18,277 ERROR ~ There was a problem with with processing MediaFile[13] with error Error during coding process: Cannot run program "/opt/local/bin/ffmpeg -i /Users/[...]/data/media/1/1/test.mov [...] /Users/[...]/data/media/1/13/encoded.mp3" (in directory "/Users/[...]/data"): error=2,No such file or directory
java.lang.Exception: Error during coding process: Cannot run program "/opt/local/bin/ffmpeg -i /Users/Luuk/Documents/Java/idoms-server/data/media/1/1/test.mov -y -f mpegts -acodec libmp3lame -ar 48000 -b:a 64000 -vn -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 200k -maxrate -1 -bufsize -1 -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -g 30 -async 2 /Users/Luuk/Documents/Java/idoms-server/data/media/1/13/encoded.mp3" (in directory "/Users/Luuk/Documents/Java/idoms-server/data"): error=2,No such file or directory
at logic.server.MediaCoder.encodeMediaFile(MediaCoder.java:313)
at logic.server.MediaCoder.doJob(MediaCoder.java:54)
at play.jobs.Job.doJobWithResult(Job.java:50)
at play.jobs.Job.call(Job.java:146)
at play.jobs.Job$1.call(Job.java:66)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.io.IOException: Cannot run program "/opt/local/bin/ffmpeg -i /Users/Luuk/Documents/Java/idoms-server/data/media/1/1/test.mov -y -f mpegts -acodec libmp3lame -ar 48000 -b:a 64000 -vn -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 200k -maxrate -1 -bufsize -1 -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -g 30 -async 2 /Users/Luuk/Documents/Java/idoms-server/data/media/1/13/encoded.mp3" (in directory "/Users/Luuk/Documents/Java/idoms-server/data"): error=2,No such file or directory
at java.lang.ProcessBuilder.start(ProcessBuilder.java:460)
at logic.server.MediaCoder.encodeMediaFile(MediaCoder.java:189)
... 11 more
Caused by: java.io.IOException: error=2,No such file or directory
at java.lang.UNIXProcess.forkAndExec(Native Method)
at java.lang.UNIXProcess.<init>(UNIXProcess.java:53)
at java.lang.ProcessImpl.start(ProcessImpl.java:91)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:453)
... 12 more
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