Java 언어로 비디오 처리 애플리케이션 개발 소개

public class VideoEncoder {

    public void encode MP4toFLV(String MP4FilePath, String FLVFilePath) throws Exception {
        File input = new File(MP4FilePath);
        File output = new File(FLVFilePath);

        SeekableByteChannel inputSBChannel = NIOUtils.readableFileChannel(input);
        SeekableByteChannel outputSBChannel = NIOUtils.writableFileChannel(output);

        MP4Demuxer demuxer = new MP4Demuxer(inputSBChannel);

        Transcoder transcoder = new FMJPlugin.TFMJTranscoder();

        transcoder.videoEncoderFourCC("FLV1");
        transcoder.setVideoQuality(0.6);

        MediaInfo sourceInfo = demuxer.getMediaInfo();
        Codec codec = Codec.getDecoder(sourceInfo.getVideoCodec());
        VideoDecoder vd = codec == null ? null : (VideoDecoder) codec.getDecoder(new VideoCodecMeta(sourceInfo.getVideoCodecMeta().getCodec(), sourceInfo.getVideoCodecMeta().getFourcc(), sourceInfo.getVideoCodecMeta().getTimestampScale(), sourceInfo.getVideoCodecMeta().getSize()));

        transcoder.addVideoTrack(outputSBChannel, vd, sourceInfo.getVideoFps(), 640, 480);

        Packet packet;
        long count = 0;

        while ((packet = demuxer.read(sourceInfo.getVideoTrack())) != null) {
            if (packet.isKeyFrame() && packet.isVideo()) {
                transcoder.encodeVideo(packet, outputSBChannel);
            }
            io.natty.TranscoderUtil.logProgress(++count);
        }

        transcoder.finish(outputSBChannel);
        outputSBChannel.close();
    }
}

public class VideoEditor {

    public void clipVideo(String inputFilePath, String outputFilePath, int startFrame, int endFrame) throws Exception {
        FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(inputFilePath);
        grabber.start();

        FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(outputFilePath, grabber.getImageWidth(), grabber.getImageHeight());
        recorder.setFormat("mp4");
        recorder.setFrameRate(grabber.getFrameRate());
        recorder.start();

        Frame frame = null;
        int frameNum = grabber.getLengthInFrames();
        int count = 0;
        while ((frame = grabber.grabFrame()) != null) {
            if (count >= startFrame && count <= endFrame) {
                recorder.record(frame);
            } else if (count > endFrame) {
                break;
            }
            count++;
        }

        grabber.stop();
        recorder.stop();
    }

    public void mergeVideo(String[] inputFilePaths, String outputFilePath) throws Exception {
        List<FFmpegFrameGrabber> grabbers = new ArrayList<>();
        long totalFrameNum = 0;

        for (String inputFilePath : inputFilePaths) {
            FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(inputFilePath);
            grabber.start();
            grabbers.add(grabber);
            totalFrameNum += grabber.getLengthInFrames();
        }

        FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(outputFilePath, grabbers.get(0).getImageWidth(), grabbers.get(0).getImageHeight());
        recorder.setFrameRate(grabbers.get(0).getFrameRate());
        recorder.start();

        for (FFmpegFrameGrabber grabber : grabbers) {
            Frame frame = null;
            long count = 0;

            while ((frame = grabber.grabFrame()) != null) {
                recorder.record(frame);
                count++;
                io.natty.TranscoderUtil.logProgress(count, totalFrameNum);
            }

            grabber.stop();
        }

        recorder.stop();
    }

    public void cropVideo(String inputFilePath, String outputFilePath, int x, int y, int width, int height) throws Exception {
        FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(inputFilePath);
        grabber.start();

        FFmpegFrameFilter filter = new FFmpegFrameFilter("crop=" + width + ":" + height + ":" + x + ":" + y);
        filter.start();

        FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(outputFilePath, grabber.getImageWidth(), grabber.getImageHeight());
        recorder.setFormat("mp4");
        recorder.setFrameRate(grabber.getFrameRate());
        recorder.start();

        Frame frame = null;

        while ((frame = grabber.grabFrame()) != null) {
            filter.push(frame);
            Frame filteredFrame = filter.pull();
            recorder.record(filteredFrame);
        }

        grabber.stop();
        filter.stop();
        recorder.stop();
    }
}