java - xuggle-xuggler 5.4 NullPointerException when encoding audio -

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today working xuggler library , tried capturing screen worked flawless. wanted add audio microphone video file captured. not easy had expected, , i'm stuck strange nullpointerexception.

this code (abbreviated):

audioformat format = new audioformat(8000.0f, 16, 1, true, false); writer.addaudiostream(1, 0, 1, (int) format.getsamplerate()); targetdataline line = gettargetdatalineforrecord(format); final int framesizeinbytes = format.getframesize(); final int bufferlengthinframes = line.getbuffersize() / 8; final int bufferlengthinbytes = bufferlengthinframes * framesizeinbytes; final byte[] buf = new byte[bufferlengthinbytes]; final long starttime = system.nanotime(); ... while (recording) {     int numbytesread = 0;     numbytesread = line.read(buf, 0, bufferlengthinbytes);     int numsamplesread = numbytesread / 2;     short[] audiosamples = new short[numsamplesread];     if (format.isbigendian()) {         (int = 0; < numsamplesread; i++) {             audiosamples[i] = (short) ((buf[2 * i] << 8) | buf[2 * + 1]);         }     } else {         (int = 0; < numsamplesread; i++) {             audiosamples[i] = (short) ((buf[2 * + 1] << 8) | buf[2 * i]);         }     }     writer.encodeaudio(1, audiosamples, system.nanotime() - starttime, timeunit.nanoseconds); // capturescreen.java:118     } writer.close();

and here nullpointerexception:

java.lang.nullpointerexception     @ com.xuggle.mediatool.mediawriter.encodeaudio(mediawriter.java:923)     @ exe.media.capturescreen.capturescreen(capturescreen.java:118)     @ exe.media.capturescreen.main(capturescreen.java:43)

the problem i'm having @ line (118):

writer.encodeaudio(1, audiosamples, system.nanotime() - starttime, timeunit.nanoseconds);

for reason when try encode audio samples, xuggle throws nullpointerexception, i'm not sure if bug or me doing stupid unable solve anyway.

for better understanding have posted code on pastebin , includes code capturing screen , code try record audio.

these jars have included:
commons-cli-1.2.jar
logback-classic-1.1.2.jar
logback-core-1.1.2.jar
xuggle-xuggler-arch-x86_x64-w64-mingw32.jar*
xuggle-xuggler-noarch-5.4.jar*

(the '*' means didn't download jar it's primary location.

thanks in advance and remember helpful answer rewarded 50 rep bounty!

i assume have line.open(format); , line.start(); somewhere?

you may need make sure have audiosamples: if (audiosamples.length > 0) writer.encodeaudio ...

also, may want add slf4j-api-1.6.4.jar , slf4j-simple-1.6.4.jar more details on errors xuggler.


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