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) ; } }