伙计们，我在视频中坚持视频质量。如何在视频中更改视频质量。帮帮我
答案 0 :(得分：0)
如果您使用public class WaveFile {
public final int NOT_SPECIFIED = AudioSystem.NOT_SPECIFIED; // -1
public final int INT_SIZE = 4;
private int sampleSize = NOT_SPECIFIED;
private long framesCount = NOT_SPECIFIED;
private int sampleRate = NOT_SPECIFIED;
private int channelsNum;
private byte[] data; // wav bytes
private AudioInputStream ais;
private AudioFormat af;
private Clip clip;
private boolean canPlay;
public WaveFile(File file) throws UnsupportedAudioFileException, IOException {
if (!file.exists()) {
throw new FileNotFoundException(file.getAbsolutePath());
}
ais = AudioSystem.getAudioInputStream(file);
af = ais.getFormat();
framesCount = ais.getFrameLength();
sampleRate = (int) af.getSampleRate();
sampleSize = af.getSampleSizeInBits() / 8;
channelsNum = af.getChannels();
long dataLength = framesCount * af.getSampleSizeInBits() * af.getChannels() / 8;
data = new byte[(int) dataLength];
ais.read(data);
AudioInputStream aisForPlay = AudioSystem.getAudioInputStream(file);
try {
clip = AudioSystem.getClip();
clip.open(aisForPlay);
clip.setFramePosition(0);
canPlay = true;
} catch (LineUnavailableException e) {
canPlay = false;
System.out.println("I can play only 8bit and 16bit music.");
}
}
public boolean isCanPlay() {
return canPlay;
}
public void play() {
clip.start();
}
public void stop() {
clip.stop();
}
public AudioFormat getAudioFormat() {
return af;
}
public int getSampleSize() {
return sampleSize;
}
public double getDurationTime() {
return getFramesCount() / getAudioFormat().getFrameRate();
}
public long getFramesCount() {
return framesCount;
}
/**
* Returns sample (amplitude value). Note that in case of stereo samples
* go one after another. I.e. 0 - first sample of left channel, 1 - first
* sample of the right channel, 2 - second sample of the left channel, 3 -
* second sample of the rigth channel, etc.
*/
public int getSampleInt(int sampleNumber) {
if (sampleNumber < 0 || sampleNumber >= data.length / sampleSize) {
throw new IllegalArgumentException(
"sample number can't be < 0 or >= data.length/"
+ sampleSize);
}
byte[] sampleBytes = new byte[4]; //4byte = int
for (int i = 0; i < sampleSize; i++) {
sampleBytes[i] = data[sampleNumber * sampleSize * channelsNum + i];
}
int sample = ByteBuffer.wrap(sampleBytes)
.order(ByteOrder.LITTLE_ENDIAN).getInt();
return sample;
}
public int getSampleRate() {
return sampleRate;
}
public Clip getClip() {
return clip;
}
}
来传输视频，我建议您使用HLS并在服务器端处理它，同时您还可以了解如何设置视频质量here。