/**
* TODO
*
* @author Administrator
* @version 1.0
* @date 2021/11/5 16:55
*/
public class vedio {
/**
* 传视频File对象(这是一个具体的文件),返回压缩后File对象信息
*
* @param source
*/
public static File compressionVideo(File source, String picName) {
if (source == null) {
return null;
}
String newPath = source.getAbsolutePath().substring(0, source.getAbsolutePath().lastIndexOf(File.separator)).concat(File.separator).concat(picName);
File target = new File(newPath);
try {
MultimediaObject object = new MultimediaObject(source);
AudioInfo audioInfo = object.getInfo().getAudio();
// 根据视频大小来判断是否需要进行压缩,
int maxSize = 5;
double mb = Math.ceil(source.length() / 1048576);
int second = (int) object.getInfo().getDuration() / 1000;
BigDecimal bd = new BigDecimal(String.format("%.4f", mb / second));
System.out.println("开始压缩视频了--> 视频每秒平均 " + bd + " MB ");
// 视频 > 5MB, 或者每秒 > 0.5 MB 才做压缩, 不需要的话可以把判断去掉
boolean temp = mb > maxSize || bd.compareTo(new BigDecimal(0.5)) > 0;
// if(temp){
long time = System.currentTimeMillis();
//TODO 视频属性设置
// int maxBitRate = 128000;
int maxBitRate = 16000;
// int maxSamplingRate = 44100;
int maxSamplingRate = 16000;
int bitRate = 100000;
// int bitRate = 800000;
int maxFrameRate = 20;
// int maxWidth = 1280;
int maxWidth = 720;
AudioAttributes audio = new AudioAttributes();
// 设置通用编码格式10 audio.setCodec("aac");
// 设置最大值:比特率越高,清晰度/音质越好
// 设置音频比特率,单位:b (比特率越高,清晰度/音质越好,当然文件也就越大 128000 = 182kb)
if (audioInfo.getBitRate() > maxBitRate) {
audio.setBitRate(new Integer(maxBitRate));
}
// 设置重新编码的音频流中使用的声道数(1 =单声道,2 = 双声道(立体声))。如果未设置任何声道值,则编码器将选择默认值 0。
audio.setChannels(audioInfo.getChannels());
// 采样率越高声音的还原度越好,文件越大
// 设置音频采样率,单位:赫兹 hz
// 设置编码时候的音量值,未设置为0,如果256,则音量值不会改变
// audio.setVolume(256);
if (audioInfo.getSamplingRate() > maxSamplingRate) {
audio.setSamplingRate(maxSamplingRate);
}
//TODO 视频编码属性配置
ws.schild.jave.info.VideoInfo videoInfo = object.getInfo().getVideo();
VideoAttributes video = new VideoAttributes();
video.setCodec("h264");
//设置音频比特率,单位:b (比特率越高,清晰度/音质越好,当然文件也就越大 800000 = 800kb)
if (videoInfo.getBitRate() > bitRate) {
video.setBitRate(bitRate);
}
// 视频帧率:15 f / s 帧率越低,效果越差
// 设置视频帧率(帧率越低,视频会出现断层,越高让人感觉越连续),视频帧率(Frame rate)是用于测量显示帧数的量度。所谓的测量单位为每秒显示帧数(Frames per Second,简:FPS)或“赫兹”(Hz)。
if (videoInfo.getFrameRate() > maxFrameRate) {
video.setFrameRate(maxFrameRate);
}
// 限制视频宽高
int width = videoInfo.getSize().getWidth();
int height = videoInfo.getSize().getHeight();
if (width > maxWidth) {
float rat = (float) width / maxWidth;
video.setSize(new VideoSize(maxWidth, (int) (height / rat)));
}
EncodingAttributes attr = new EncodingAttributes();
// attr.setFormat("mp4");
attr.setAudioAttributes(audio);
attr.setVideoAttributes(video);
// 速度最快的压缩方式, 压缩速度 从快到慢: ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow and placebo.
// attr.setPreset(PresetUtil.VERYFAST);
// attr.setCrf(27);
// // 设置线程数
// attr.setEncodingThreads(Runtime.getRuntime().availableProcessors()/2);
Encoder encoder = new Encoder();
encoder.encode(new MultimediaObject(source), target, attr);
System.out.println("压缩总耗时:" + (System.currentTimeMillis() - time) / 1000);
return target;
// }
} catch (Exception e) {
e.printStackTrace();
} finally {
if (target.length() > 0) {
source.delete();
}
}
return source;
}
public static void main(String[] args) {
File f = new File("E://big.mp4");
File file = compressionVideo(f, "22.mp4");
}
}