javacv 写mp4_javacv FFmpeg 视频压缩

packagecom.nmcc.demo.utils;importlombok.extern.slf4j.Slf4j;importorg.bytedeco.javacpp.avcodec;importorg.bytedeco.javacpp.avutil;importorg.bytedeco.javacv.FFmpegFrameGrabber;importorg.bytedeco.javacv.FFmpegFrameRecorder;importorg.bytedeco.javacv.Frame;importjava.io.File;/***@author* @date 2020/2/17

*

* Description:*/@Slf4jpublic classConvertVideo {private static final int FRAME_RATE = 30;private static final int VIDEO_BITRATE = 1048576;private static final int COMPRESS_WIDTH = 320;/*** 在使用时发现视频压缩和视频时长有关系

* 一个9M的56s的视频压缩后视频7M多

* 一个22M的5s的视频压缩后视频624K

*@paramfile

*@paramcheckCompress

*@return

*/

public staticString convert(File file, Boolean checkCompress) {

FFmpegFrameGrabber frameGrabber= newFFmpegFrameGrabber(file.getAbsolutePath());

String fileName= null;

Frame captured_frame= null;

FFmpegFrameRecorder recorder= null;try{

frameGrabber.start();

fileName= file.getAbsolutePath().replace(“.mp4”, “_edited.mp4”);

log.info(“wight:{},height:{}”,frameGrabber.getImageWidth(), frameGrabber.getImageHeight());int height =frameGrabber.getImageHeight();int widht =frameGrabber.getImageWidth();if(checkCompress &&needCompress(file.length())){

height=calculateHeight(frameGrabber.getImageWidth(), frameGrabber.getImageHeight(), COMPRESS_WIDTH);

widht=COMPRESS_WIDTH;

log.info(“new wight:{},height:{}”,widht, height);

}

recorder= newFFmpegFrameRecorder(fileName, widht, height, frameGrabber.getAudioChannels());

recorder.setFrameRate(FRAME_RATE);//下面这行打开就报错//recorder.setSampleFormat(frameGrabber.getSampleFormat());

recorder.setSampleRate(frameGrabber.getSampleRate());//recorder.setAudioChannels(1);

recorder.setVideoOption(“preset”, “veryfast”);//yuv420p,像素

recorder.setPixelFormat(avutil.AV_PIX_FMT_YUV420P);

recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);

recorder.setAudioCodec(avcodec.AV_CODEC_ID_AAC);

recorder.setFormat(“mp4”);//比特//recorder.setVideoBitrate(VIDEO_BITRATE);

recorder.start();while (true) {try{

captured_frame=frameGrabber.grabFrame();if (captured_frame == null) {

System.out.println(“!!! end cvQueryFrame”);break;

}

recorder.setTimestamp(frameGrabber.getTimestamp());

recorder.record(captured_frame);

}catch(Exception e) {

}

}

recorder.stop();

recorder.release();

frameGrabber.stop();

}catch(Exception e) {

e.printStackTrace();

}//file.delete();

returnfileName;

}/*** 是否需要压缩，大于3MB

*@paramlength

*@return

*/

public static boolean needCompress(longlength){

log.info(“video size:{}”, length);return length >= 3145728;

}/*** 等比计算新高度

*@paramw

*@paramh

*@paramnw

*@return

*/

private static int calculateHeight(int w, int h, intnw){double s = Integer.valueOf(h).doubleValue() /Integer.valueOf(w).doubleValue();int height = (int) (nw *s);//如果宽和高不是偶数recorder.start();会报错

if(height % 2 !=0){

height+= 1;

}returnheight;

}

}

引入压缩视频的java依赖

org.bytedeco

javacv

1.4.3

org.bytedeco

javacpp

org.bytedeco.javacpp-presets

flycapture

org.bytedeco.javacpp-presets

libdc1394

org.bytedeco.javacpp-presets

libfreenect

org.bytedeco.javacpp-presets

libfreenect2

org.bytedeco.javacpp-presets

librealsense

org.bytedeco.javacpp-presets

videoinput

org.bytedeco.javacpp-presets

opencv

org.bytedeco.javacpp-presets

tesseract

org.bytedeco.javacpp-presets

leptonica

org.bytedeco.javacpp-presets

flandmark

org.bytedeco.javacpp-presets

artoolkitplus

org.bytedeco

javacv-platform

1.4.3

org.bytedeco

javacv

org.bytedeco.javacpp-presets

flycapture-platform

org.bytedeco.javacpp-presets

libdc1394-platform

org.bytedeco.javacpp-presets

libfreenect-platform

org.bytedeco.javacpp-presets

libfreenect2-platform

org.bytedeco.javacpp-presets

librealsense-platform

org.bytedeco.javacpp-presets

videoinput-platform

org.bytedeco.javacpp-presets

opencv-platform

org.bytedeco.javacpp-presets

tesseract-platform

org.bytedeco.javacpp-presets

leptonica-platform

org.bytedeco.javacpp-presets

flandmark-platform

org.bytedeco.javacpp-presets

artoolkitplus-platform