java - FFmpeg 不适用于 android 10，直接进入 onFailure(String message) 并显示空消息

Question

我在我的一个视频压缩项目中使用 FFmpeg。在 Android 10 (Google Pixel 3a) 上，它会直接进入 onFailure(String message)，并为执行的任何命令发送空消息。

所以我在我的应用程序 gradle 文件中指定了 (api 'com.writingminds:FFmpegAndroid:0.3.2')，

在 list 中指定权限(android.permission.WRITE_EXTERNAL_STORAGE)

我也是这样的:

InitializationCallback initializationCallback = new InitializationCallback();
    try {
        FFmpeg.getInstance(context).loadBinary(initializationCallback);
    } catch (FFmpegNotSupportedException e) {
        initializationCallback.onFailure();
        initializationCallback.onFinish();
    }

初始化很好，这里没有问题。

后来:

void getData(File inputFile) {
//inputFile points to: /storage/emulated/0/Android/data/{package_name}/files/temp_files/temp_1.mp4
        String[] cmd = ("-i " + inputFile.getAbsolutePath()).split(" ");
        try {
            FFmpeg.getInstance(App.instance).execute(cmd, this);
        } catch (FFmpegCommandAlreadyRunningException e) {
            throw new Error(e);
        }
    }

    @Override
    public void onStart() {
         //This method is called
    }

    @Override
    public void onSuccess(String message) {
         //This method is NOT called
         extractAvailableData(message);
    }

    @Override
    public void onProgress(String message) {
        //This method is NOT called
        extractAvailableData(message);
    }

    @Override
    public void onFailure(String message) {
        //This method is called and the message is empty
        extractAvailableData(message);
    }

    @Override
    public void onFinish() {
        //This method is called
    }

如果我这样做:

String command = "-i ***/file1.mp4 -map 0:v -map 0:a -preset ultrafast -s:v 750:350 ***/file2.mp4";
//file2.mp4 is a non existent file at this point
// (***) --> is just a replacement for the full path of the file, just to keep things shorter here.

String[] cmd = command.split(" ");
        try {
            FFmpeg.getInstance(App.instance).execute(cmd, this);
        } catch (FFmpegCommandAlreadyRunningException e) {
            throw new Error(e);
        }

给出相同的结果，没有视频转换，只是调用 onFailure("Nothing")

即使我这样做:

String[] cmd = {"-version"};
        try {
            FFmpeg.getInstance(App.instance).execute(cmd, this);
        } catch (FFmpegCommandAlreadyRunningException e) {
            throw new Error(e);
        }

我什么也没得到，根本没有输出。

到目前为止，我只在 Android 10 上遇到过这个问题，它在其他设备上运行良好。

Answer 1

Android 10 的行为发生了变化，删除了应用程序主目录的执行权限。如果您尝试从 App 主目录运行执行文件，您将获得权限被拒绝的异常。

以下是目标 SDK 版本 29 的更改详情:https://developer.android.com/about/versions/10/behavior-changes-10#execute-permission

java.io.IOException: Cannot run program "/data/user/0/<package name>/files/ffmpeg": error=13, Permission denied
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:1050)
        at nl.bravobit.ffmpeg.ShellCommand.run(ShellCommand.java:15)
        at nl.bravobit.ffmpeg.FFcommandExecuteAsyncTask.doInBackground(FFcommandExecuteAsyncTask.java:43)
        at nl.bravobit.ffmpeg.FFcommandExecuteAsyncTask.doInBackground(FFcommandExecuteAsyncTask.java:12)
        at android.os.AsyncTask$3.call(AsyncTask.java:378)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:919)
     Caused by: java.io.IOException: error=13, Permission denied
        at java.lang.UNIXProcess.forkAndExec(Native Method)
        at java.lang.UNIXProcess.<init>(UNIXProcess.java:133)
        at java.lang.ProcessImpl.start(ProcessImpl.java:141)