Java Gstreamer Gnonlin source segmentation

Question

使用java gstreamer绑定1，我想从磁盘上读取一个音频文件，然后将此文件的段写回磁盘。为此，我无法使用" FilesRC"元素，但是我发现我可以使用Gnonlin插件2。

中的" gnlurisource"元素。

我使用了GSTREAMER JAVA绑定，然后在本地进行了编译，从而将我添加到项目中的JAR文件。我还使用以下命令在Ubuntu上安装了Gstreamer：

sudo apt-get install libgstreamer1.0-dev
sudo apt-get install gstreamer1.0-gnonlin

程序没有错误编译，但它仍然卡住了，什么也不做。下面我附加了程序代码：

import java.util.concurrent.TimeUnit;
import org.freedesktop.gstreamer.Element;
import org.freedesktop.gstreamer.ElementFactory;
import org.freedesktop.gstreamer.Gst;
import org.freedesktop.gstreamer.Pipeline;
import org.freedesktop.gstreamer.State;

public class AudioSegmentation {
public static void main(String[] args) {
    Pipeline pipe;
    Element asr;
    Element composition;
    Element gnlsource;
    Element convert;
    Element filesink;
    Gst.init();
    pipe = new Pipeline("SimplePipeline");
    composition = ElementFactory.make("gnlcomposition", "comp");
    gnlsource = ElementFactory.make("gnlurisource", "gnlsource");
    convert = ElementFactory.make("audioconvert", "compconvert");
    filesink = ElementFactory.make("filesink", "filesink");
    gnlsource.set("uri", "file:///home/user/Desktop/file-source.wav");
    gnlsource.set("start", TimeUnit.SECONDS.toNanos(5));
    gnlsource.set("duration", TimeUnit.SECONDS.toNanos(2));
    filesink.set("location", "/home/user/Desktop/file-destination.wav");
    composition.link(gnlsource);
    pipe.addMany(composition, convert, filesink);
    Element.linkMany(composition, convert, filesink);
    pipe.setState(State.PLAYING);
    Gst.main();
    Gst.quit();
}

}

我没有与GSTREAMER的经验太多，您能给我一个问题吗？

谢谢！

Answer 1

更新：我设法使用命令行中的gstreamer从音频文件中选择一个段。" gnlurisource"元素具有" inpoint"牧板器来设置段开始时间和"持续时间"以指定段的持续时间。这是命令：

gst-launch-1.0 gnlurisource uri=file:///home/user/Desktop/file-source.wav inpoint=2000000000 duration=1500000000 ! audioconvert ! wavenc ! filesink location=/home/user/Desktop/file-destination.wav

我仍在尝试在Java中实现此管道。我尝试了这样的事情，但它不起作用：

import java.util.concurrent.TimeUnit;
import org.freedesktop.gstreamer.Element;
import org.freedesktop.gstreamer.ElementFactory;
import org.freedesktop.gstreamer.Gst;
import org.freedesktop.gstreamer.Pipeline;
import org.freedesktop.gstreamer.State;

public class AudioSegmentation {
public static void main(String[] args) {
    Pipeline pipe;
    Element gnlsource;
    Element audioconvert;
    Element wavenc;
    Element filesink;
    Gst.init();
    pipe = new Pipeline("SimplePipeline");
    gnlurisource = ElementFactory.make("gnlurisource", "gnlurisource");
    audioconvert = ElementFactory.make("audioconvert", "audioconvert");
    wavenc = ElementFactory.make("wavenc", "wavenc");
    filesink = ElementFactory.make("filesink", "filesink");
    gnlurisource.set("uri", "file:///home/user/Desktop/file-source.wav");
    gnlurisource.set("inpoint", TimeUnit.SECONDS.toNanos(2));
    gnlurisource.set("duration", TimeUnit.SECONDS.toNanos(3));
    filesink.set("location", "/home/user/Desktop/file-destination.wav");
    pipe.addMany(gnlurisource, audioconvert, wavenc, filesink);
    Element.linkMany(gnlurisource, audioconvert, wavenc, filesink);
    pipe.setState(State.PLAYING);
    Gst.main();
    Gst.quit();
}