)_错误(是否调用了javacv ()？javacv
)_错误(是否调用了javacv ()？javacv
提问于 2015-01-18 19:24:52
嗨，我正在制作用javacv录制视频和音频的程序，但我得到了一些错误。有什么建议吗？
lib版本: jdk 1.8 javacv 0.8 opencv 2.4.9
Exception in thread "main" org.bytedeco.javacv.FrameGrabber$Exception: avformat_open_input() error -2: Could not open input "output.mp4". (Has setFormat() been called?)
at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:362)
at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:312)
at com.unomic.securobot.javacv.main(javacv.java:14)我的代码
FFmpegFrameGrabber grabber1 = new FFmpegFrameGrabber("output.mp4");
FFmpegFrameGrabber grabber2 = new FFmpegFrameGrabber("test.mp3");
grabber1.setFormat("mp4");
grabber1.start();
grabber2.start();
FFmpegFrameRecorder recorder = new FFmpegFrameRecorder("outputFinal.mp4",
grabber1.getImageWidth(), grabber1.getImageHeight(),
grabber2.getAudioChannels());
recorder.setFrameRate(grabber1.getFrameRate());
recorder.setSampleFormat(grabber2.getSampleFormat());
recorder.setSampleRate(grabber2.getSampleRate());
recorder.start();
Frame frame1;
Frame frame2 = null;
while ((frame1 = grabber1.grabFrame()) != null ||
(frame2 = grabber2.grabFrame()) != null) {
recorder.record(frame1);
recorder.record(frame2);
}
recorder.stop();
grabber1.stop();
grabber2.stop();
}回答 1
Stack Overflow用户
发布于 2017-02-22 15:42:20
我试着用帧捕获器从视频中获取缩略图。我得到了相同的错误，但我只是尝试给出文件的完整路径，瞧，它起作用了。以前，我使用的是不起作用的相对路径。当我给出完整的路径时，它开始工作了。
package com.tape.controller;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import javax.imageio.ImageIO;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.OpenCVFrameGrabber;
public class VideoThumbTaker {
protected String ffmpegApp;
public VideoThumbTaker(String ffmpegApp)
{
this.ffmpegApp = ffmpegApp;
}
public void getThumb(String videoFilename, String thumbFilename, int width, int height,int hour, int min, float sec)
throws IOException, InterruptedException
{
ProcessBuilder processBuilder = new ProcessBuilder(ffmpegApp, "-y", "-i", videoFilename, "-vframes", "1",
"-ss", hour + ":" + min + ":" + sec, "-f", "mjpeg", "-s", width + "*" + height, "-an", thumbFilename);
Process process = processBuilder.start();
InputStream stderr = process.getErrorStream();
InputStreamReader isr = new InputStreamReader(stderr);
BufferedReader br = new BufferedReader(isr);
String line;
while ((line = br.readLine()) != null);
process.waitFor();
}
public static void main(String[] args) throws Exception, IOException
{
//Both case work
FFmpegFrameGrabber g = new FFmpegFrameGrabber("C:\\JavaEE\\New Project\\tape\\src\\main\\webapp\\web-resources\\videos\\vid.mp4");
g.setFormat("mp4");
g.start();
for (int i = 0 ; i < 50 ; i++) {
ImageIO.write(g.grab().getBufferedImage(), "png", new File("C:\\JavaEE\\New Project\\tape\\src\\main\\webapp\\web-resources\\thumbnails\\video-frame-" + System.currentTimeMillis() + ".png"));
}
g.stop();
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/28009139
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