Question

使用Java Gstreamer绑定1，我想从磁盘读取一个音频文件，并将该文件的一部分写回磁盘。为此，我不能使用“filesrc”元素，而是发现我可以使用Gnonlin插件2中的“gnlurisource”元素。

我接受了Gstreamer Java绑定，并在本地编译它，得到一个我添加到项目中的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

程序编译时没有错误，但它仍然卡住并且什么都不做。下面我附上我的程序代码：

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();

}

}

我对Gstreamer没有那么多经验，你能给我一个关于错误的暗示吗？

谢谢！

Answer 1

更新：我设法从命令行使用gstreamer从音频文件中选择一个段。 “gnlurisource”元素具有“inpoint”参数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

我仍在尝试用Java实现这个管道。我尝试过类似的东西，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();

}

Java Gstreamer Gnonlin源码分割

1 个答案: