Java中可以通过使用Xuggler库实现视频压缩。
一、获取Xuggler库
首先需要获取Xuggler的库。
// Maven项目添加依赖 <dependency> <groupId>com.xuggle</groupId> <artifactId>xuggle-xuggler</artifactId> <version>5.4</version> </dependency>
二、创建媒体读取器和媒体编写器
然后创建一个媒体读取器用于读取原始的视频文件，并创建一个媒体编写器用于写入压缩后的视频文件。
import com.xuggle.mediatool.IMediaReader;
import com.xuggle.mediatool.IMediaWriter;
import com.xuggle.mediatool.ToolFactory;
import com.xuggle.mediatool.event.IAddStreamEvent;
import com.xuggle.mediatool.event.IWritePacketEvent;
import com.xuggle.mediatool.event.IWriteHeaderEvent;
import com.xuggle.mediatool.event.IWriteTrailerEvent;
import com.xuggle.xuggler.ic;
import com.xuggle.mediatool.IMediaTool;
public class VideoCompressor {
public static void main(String[] args) {
String inputFilename = "input.mp4";
String outputFilename = "output.flv";
// create a media reader
IMediaReader mediaReader = ToolFactory.makeReader(inputFilename);
// create a media writer
IMediaWriter mediaWriter = ToolFactory.makeWriter(outputFilename, mediaReader);
// add a writer to the reader, to create the output file
mediaReader.addListener(mediaWriter);
// create a tool to add a media listener
IMediaTool imageMediaTool = new StaticImageMediaTool();
mediaWriter.addListener(imageMediaTool);
// read and decode packets from the source file and
// and dispatch decoded audio and video to the writer
while (mediaReader.readPacket() == null) ;
}
}三、设置视频压缩比例
最后需要设置视频压缩的比例。在这个过程中，可以通过IStreamCoder设置编码器参数，如比特率、帧率和分辨率等等。
import com.xuggle.xuggler.IStreamCoder;
import com.xuggle.xuggler.IStream;
import com.xuggle.xuggler.IRational;
import com.xuggle.xuggler.ICodec;
public class VideoCompressor {
public void compressVideo(String inputFilename, String outputFilename, int audioBitrate, int videoBitrate) {
// create a media reader
IMediaReader mediaReader = ToolFactory.makeReader(inputFilename);
// create a media writer
IMediaWriter mediaWriter = ToolFactory.makeWriter(outputFilename, mediaReader);
// manually configure the video stream
IStreamCoder coder = IStream.make(null, 0, ICodec.ID.CODEC_ID_FLV1, ICodec.Type.CODEC_TYPE_VIDEO, videoBitrate).getStreamCoder();
coder.setWidth(320);
coder.setHeight(240);
coder.setFrameRate(IRational.make(15, 1));
coder.setGlobalQuality(0);
// manually configure the audio stream
coder = IStream.make(null, 1, ICodec.ID.CODEC_ID_MP3, ICodec.Type.CODEC_TYPE_AUDIO, audioBitrate).getStreamCoder();
coder.setChannels(2);
coder.setSampleRate(44100);
// add a writer to the reader
mediaReader.addListener(mediaWriter);
// read and decode packets, will be dispatched to writer
while (mediaReader.readPacket() == null) ;
}
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