Process Builder dà un "No such file or directory" su Mac mentre Runtime(). Exec() funziona bene

Question

Ho un'applicazione, in esecuzione su Playframework, che ha bisogno di codificare alcuni file video. Ho usato "Process pr = Runtime.getRuntime(). Exec (execCode)" per questo (e funziona perfettamente), ma poiché ho bisogno sia del flusso di output che del flusso di errori sto cercando di usare ProcessBuilder (come è anche raccomandato) .

Ma non riesco a farlo funzionare (test su un MacBook). C'è una differenza fondamentale tra il metodo Runtime e ProcessBuilder?

Questo è il mio codice per ProcessBuilder (esattamente lo stesso codice funziona quando sostituito da 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(); 

Questa è l'uscita della console:

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 

Answer 1

È necessario specificare gli argomenti come separato Strings:

new ProcessBuilder("cmd", "arg1", "arg2", ...); 

Il costruttore accetta String, varargs e List<String>.

Vedere ProcessBuilder documentation.