Question

我正在使用JavaScript，ffmpeg和java创建视频编辑应用程序。使用FFMPEG我创建了提取n帧视频，而不是使用canvas.toDataUrl我用现有的图像帧速率替换新图像，一切都很小心，但是当我使用这些图像创建视频时，FFMPEG从不包括新创建的PNG图像。

从HTML5画布保存png图像的代码

Base64 decoder = new Base64();
    byte[] pic = decoder.decodeBase64(request.getParameter("pic"));
    String frameCount = request.getParameter("frame");
    InputStream in = new ByteArrayInputStream(pic);
    BufferedImage bImageFromConvert = ImageIO.read(in);
    String outdir = "output\\"+frameCount;
    //Random rand = new Random();
    File file = new File(outdir);
    if(file.isFile()){
        if(file.delete()){
            File writefile = new File(outdir);
            ImageIO.write(bImageFromConvert, "png", file);
        }
    }

从视频创建图片的代码

String filePath = "D:\\temp\\some.mpg";
    String outdir = "output";
    File file = new File(outdir);
    file.mkdirs();
    Map<String, String> m = System.getenv();

    /*
     * String command[] =
     * {"D:\\ffmpeg-win32-static\\bin\\ffmpeg","-i",filePath
     * ,"-r 30","-f","image2",outdir,"\\user%03d.jpg"};
     * 
     * ProcessBuilder pb = new ProcessBuilder(command); pb.start();
     */
    String commands = "D:\\ffmpeg-win32-static\\bin\\ffmpeg -i " + filePath
            + " -r 30  -f image2 " + outdir + "\\image%05d.png";
    Process p = Runtime.getRuntime().exec(commands);

从图片

创建视频的代码

String filePath = "output";
    File fileP = new File(filePath);
    String commands = "D:\\ffmpeg-win32-static\\bin\\ffmpeg -f image2 -i "
            + fileP + "\\image%5d.png " + fileP + "\\video.mp4";
    System.out.println(commands);
    Runtime.getRuntime().exec(commands);
    System.out.println(fileP.getAbsolutePath());

Answer 1

您已将创建声明为图像％05d.png并使用它作为图像％5d.png。所以名字中只有一个零。就是这样！

使用FFMPEG从图像创建视频

1 个答案: