FFmpeg的可执行文件模式的权限 [英] FFmpeg executable Chmod permission

问题描述

尝试使用存储在Android应用程序文件夹生食的可执行文件运行FFmpeg的命令。我得到许可被拒绝的错误，不能够调整视频。我怎样才能从我的Java文件给出正确的权限。

Trying to run FFmpeg command using executable file stored in Raw folder eclipse for android app. I am getting permission denied error and not able to resize video. How can i give right permissions from my java file.

推荐答案

把这个code在静态类或任何你想要的：

put this code in a static class or wherever you want:

public static void installBinaryFromRaw(Context context, int resId, File file) {
    final InputStream rawStream = context.getResources().openRawResource(resId);
    final OutputStream binStream = getFileOutputStream(file);

    if (rawStream != null && binStream != null) {
        pipeStreams(rawStream, binStream);

        try {
            rawStream.close();
            binStream.close();
        } catch (IOException e) {
            Log.e(TAG, "Failed to close streams!", e);
        }       

        doChmod(file, 777);
    }       
}
public static OutputStream getFileOutputStream(File file) {
    try {
        return new FileOutputStream(file);
    } catch (FileNotFoundException e) {
        Log.e(TAG, "File not found attempting to stream file.", e);
    }
    return null;
}

public static void pipeStreams(InputStream is, OutputStream os) {
    byte[] buffer = new byte[IO_BUFFER_SIZE];
    int count;
    try {
        while ((count = is.read(buffer)) > 0) {
            os.write(buffer, 0, count);
        }
    } catch (IOException e) {
        Log.e(TAG, "Error writing stream.", e);
    }
}
public static void doChmod(File file, int chmodValue) {
    final StringBuilder sb = new StringBuilder();
    sb.append("chmod");
    sb.append(' ');
    sb.append(chmodValue);
    sb.append(' ');
    sb.append(file.getAbsolutePath());

    try {
        Runtime.getRuntime().exec(sb.toString());
    } catch (IOException e) {
        Log.e(TAG, "Error performing chmod", e);
    }
}

而与此code调用它：

And call it with this code:

private void installFfmpeg() {
    File ffmpegFile = new File(getCacheDir(), "ffmpeg");
    mFfmpegInstallPath = ffmpegFile.toString();
    Log.d(TAG, "ffmpeg install path: " + mFfmpegInstallPath);

    if (!ffmpegFile.exists()) {
        try {
            ffmpegFile.createNewFile();
        } catch (IOException e) {
            Log.e(TAG, "Failed to create new file!", e);
        }
        Utils.installBinaryFromRaw(this, R.raw.ffmpeg, ffmpegFile);
    }else{
        Log.d(TAG, "It was already installed");
    }

    ffmpegFile.setExecutable(true);
    Log.d(TAG, String.valueOf(ffmpegFile.canExecute()));
}

希望吸取信息时!!

Hope it´s useful!!

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