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  • Android : FFMpeg (video creation) crashes with no exception when loading binaries in lower APIs (18 in my case) but works in newer ones

    6 mai 2019, par Diego Perez

    I have an app that uses FFMpeg for video creation (these next lines are the relevant build.gradle plugin files) :

    //writingminds
    
api 'com.writingminds:FFmpegAndroid:0.3.2'
    
//JavaCV video
    
api group: 'org.bytedeco', name: 'javacv', version: '1.4.4'
    
api group: 'org.bytedeco.javacpp-presets', name: 'opencv', version: '4.0.1-1.4.4', classifier: 'android-arm'
    
api group: 'org.bytedeco.javacpp-presets', name: 'ffmpeg', version: '4.1-1.4.4', classifier: 'android-arm'

    And my app is working (and creating video) just fine in my phone with a newer Android 8 version but I’m having weird problems in my old API 18 tablet (where, as a note, I had to install multidex).

    These next lines are the main part of FFMpeg video creation, where binaries are loaded, and, in fact, binaries load are where app crashes in my tablet in the line "ffmpeg.loadBinary(new LoadBinaryResponseHandler()..."

    As you can see, I have a try/catch where the app crashes, but it crashes with no aparent exception, as catch blocks are never hit.

    public static String recordVideo(JSONObject objJSON) {
    

    
    String strReturn = Enum.Result.OK;
    

    
    try {
    
        fileName = objJSON.has("file_name") ? String.valueOf(objJSON.getString("file_name")) : "";
    
        videoPath = objJSON.has("video_path") ? String.valueOf(objJSON.getString("video_path")) : "";
    
    } catch (JSONException e) {
    
        ExceptionHandler.logException(e);
    
    }
    

    
    FFmpeg ffmpeg = FFmpeg.getInstance(ApplicationContext.get());
    
    try {
    
        ffmpeg.loadBinary(new LoadBinaryResponseHandler() {
    

    
            @Override
    
            public void onStart() {}
    

    
            @Override
    
            public void onFailure() {}
    

    
            @Override
    
            public void onSuccess() {}
    

    
            @Override
    
            public void onFinish() {}
    
        });
    
    } catch (FFmpegNotSupportedException e) {
    
        // Handle if FFmpeg is not supported by device
    
    } catch (Exception e) {
    

    
    }
    
...

    These next lines are the relevant part of the LogCat, but I cannot figure out where the problem resides, maybe an out of memory problem ?

    Any help will be much appreciated.

    04-28 21:44:45.873 13743-13964/com.artandwords.thoughtoftheday A/libc: Fatal signal 11 (SIGSEGV) at 0x00000000 (code=1), thread 13964 (AsyncTask #4)
    
04-28 21:44:45.973 144-144/? I/DEBUG: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
    
04-28 21:44:45.983 144-144/? I/DEBUG: Build fingerprint: 'asus/WW_epad/ME302C:4.3/JSS15Q/WW_epad-V5.0.21-20140701:user/release-keys'
    
04-28 21:44:45.983 144-144/? I/DEBUG: Revision: '0'
    
04-28 21:44:45.983 144-144/? I/DEBUG: pid: 13743, tid: 13964, name: AsyncTask #4  >>> com.artandwords.thoughtoftheday <<<
    
04-28 21:44:45.983 144-144/? I/DEBUG: signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000000
    
04-28 21:44:46.003 144-144/? I/DEBUG:     eax 00000000  ebx 000000c6  ecx 00000000  edx 00000000
    
04-28 21:44:46.003 144-144/? I/DEBUG:     esi 00000e59  edi 00000000
    
04-28 21:44:46.003 144-144/? I/DEBUG:     xcs 00000073  xds 0000007b  xes 0000007b  xfs 00000043  xss 0000007b
    
04-28 21:44:46.003 144-144/? I/DEBUG:     eip 784ed378  ebp 2200ff0c  esp 2200fec4  flags 00210246
    
04-28 21:44:46.003 144-144/? I/DEBUG: backtrace:
    
04-28 21:44:46.003 144-144/? I/DEBUG:     #00  pc 00087378  /system/lib/libhoudini.so.3.4.7.44914
    
04-28 21:44:46.003 144-144/? I/DEBUG:     #01  pc 00085d0e  /system/lib/libhoudini.so.3.4.7.44914
    
04-28 21:44:46.003 144-144/? I/DEBUG:     #02  pc 00073328  /system/lib/libhoudini.so.3.4.7.44914
    
04-28 21:44:46.003 144-144/? I/DEBUG:     #03  pc 0006f7ff  /system/lib/libhoudini.so.3.4.7.44914
    
04-28 21:44:46.003 144-144/? I/DEBUG:     #04  pc 0006f3bf  /system/lib/libhoudini.so.3.4.7.44914
    
04-28 21:44:46.003 144-144/? I/DEBUG:     #05  pc 000b92de  /system/lib/libhoudini.so.3.4.7.44914
    
04-28 21:44:46.003 144-144/? I/DEBUG:     #06  pc ffffffff  <unknown>
    
04-28 21:44:46.003 144-144/? I/DEBUG:     #07  pc 001445aa  /system/lib/libhoudini.so.3.4.7.44914
    
04-28 21:44:46.013 144-144/? I/DEBUG: stack:
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436850  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436854  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436858  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b43685c  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436860  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436864  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436868  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b43686c  3822676c  /system/lib/arm/libc.so
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436870  7b436a98  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436874  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436878  7b4368c8  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b43687c  7b436a98  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436880  383003a0  /system/lib/arm/libdl.so
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436884  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436888  7b4368c8  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b43688c  785aa5ab  /system/lib/libhoudini.so.3.4.7.44914
    
04-28 21:44:46.013 144-144/? I/DEBUG:     #07  7b436890  7b4368a0  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436894  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b436898  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b43689c  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b4368a0  7b4368c8  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b4368a4  7b436890  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b4368a8  785aa59d  /system/lib/libhoudini.so.3.4.7.44914
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b4368ac  7b436a98  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b4368b0  7b437930  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b4368b4  220001d0  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b4368b8  7b436a70  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b4368bc  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b4368c0  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b4368c4  00000000  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b4368c8  7b436a88  
    
04-28 21:44:46.013 144-144/? I/DEBUG:          7b4368cc  785f3141  /system/lib/libhoudini.so.3.4.7.44914
    

    

    
    --------- beginning of /dev/log/system
    
04-28 21:44:46.063 450-470/? I/BootReceiver: Copying /data/tombstones/tombstone_03 to DropBox (SYSTEM_TOMBSTONE)
    
04-28 21:44:46.063 450-13973/? W/ActivityManager:   Force finishing activity com.artandwords.thoughtoftheday/.activities.DisplayThoughtActivity
    
04-28 21:44:46.073 145-862/? E/IMGSRV: :0: PVRDRMOpen: TP3, ret = 75
    
04-28 21:44:46.093 450-13973/? E/JavaBinder: !!! FAILED BINDER TRANSACTION !!!
    
04-28 21:44:46.093 450-483/? W/InputDispatcher: channel '21edd9e8 com.artandwords.thoughtoftheday/com.artandwords.thoughtoftheday.activities.main.MainActivity (server)' ~ Consumer closed input channel or an error occurred.  events=0x9
    
04-28 21:44:46.093 450-483/? E/InputDispatcher: channel '21edd9e8 com.artandwords.thoughtoftheday/com.artandwords.thoughtoftheday.activities.main.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
    
04-28 21:44:46.093 155-13945/? W/TimedEventQueue: Event 25 was not found in the queue, already cancelled?
    
04-28 21:44:46.093 155-3134/? W/AudioFlinger: session id 324 not found for pid 155
    
04-28 21:44:46.103 450-450/? W/InputDispatcher: Attempted to unregister already unregistered input channel '21edd9e8 com.artandwords.thoughtoftheday/com.artandwords.thoughtoftheday.activities.main.MainActivity (server)'
    
04-28 21:44:46.103 450-755/? I/WindowState: WIN DEATH: Window{21b33a28 u0 com.artandwords.thoughtoftheday/com.artandwords.thoughtoftheday.activities.DisplayThoughtActivity}
    
04-28 21:44:46.103 450-13973/? W/ActivityManager: Exception thrown during pause
    
    android.os.TransactionTooLargeException
    
        at android.os.BinderProxy.transact(Native Method)
    
        at android.app.ApplicationThreadProxy.schedulePauseActivity(ApplicationThreadNative.java:642)
    
        at com.android.server.am.ActivityStack.startPausingLocked(ActivityStack.java:1007)
    
        at com.android.server.am.ActivityStack.finishActivityLocked(ActivityStack.java:3905)
    
        at com.android.server.am.ActivityStack.finishActivityLocked(ActivityStack.java:3837)
    
        at com.android.server.am.ActivityManagerService.handleAppCrashLocked(ActivityManagerService.java:8588)
    
        at com.android.server.am.ActivityManagerService.makeAppCrashingLocked(ActivityManagerService.java:8465)
    
        at com.android.server.am.ActivityManagerService.crashApplication(ActivityManagerService.java:9170)
    
        at com.android.server.am.ActivityManagerService.handleApplicationCrashInner(ActivityManagerService.java:8699)
    
        at com.android.server.am.NativeCrashListener$NativeCrashReporter.run(NativeCrashListener.java:86)
    
04-28 21:44:46.103 450-450/? I/WindowState: WIN DEATH: Window{21edd9e8 u0 com.artandwords.thoughtoftheday/com.artandwords.thoughtoftheday.activities.main.MainActivity}
    
04-28 21:44:46.103 450-636/? I/WindowState: WIN DEATH: Window{21be0690 u0 com.artandwords.thoughtoftheday/com.artandwords.thoughtoftheday.activities.DisplayThoughtActivity}
    
04-28 21:44:46.113 450-13973/? I/WindowManager: computeScreenConfigurationLocked() Enter {1.15 ?mcc?mnc ?locale ?layoutDir ?swdp ?wdp ?hdp ?density ?lsize ?long ?orien ?uimode ?night ?touch ?keyb/?/? ?nav/?}
    
04-28 21:44:46.113 450-13973/? I/WindowManager: dw=1200, dh=1920
    
04-28 21:44:46.113 450-13973/? I/WindowManager: appWidth=1200, appHeight=1848
    
04-28 21:44:46.113 450-13973/? I/WindowManager: tempdm=DisplayMetrics{density=1.5, width=1200, height=1848, scaledDensity=1.5, xdpi=221.201, ydpi=220.591}
    
04-28 21:44:46.113 450-13973/? I/WindowManager: dm=DisplayMetrics{density=1.5, width=1200, height=1848, scaledDensity=1.5, xdpi=221.201, ydpi=220.591}, ro.product.device=ME302C
    
04-28 21:44:46.113 450-13973/? I/WindowManager: getConfigDisplayWidth=1200, getConfigDisplayHeight=1810
    
04-28 21:44:46.113 450-13973/? I/WindowManager: screenWidthDp=800, screenHeightDp=1206
    
04-28 21:44:46.113 450-13973/? I/WindowManager: computeScreenConfigurationLocked() Leave {1.15 ?mcc?mnc ?locale ?layoutDir sw800dp w800dp h1206dp 240dpi xlrg port ?uimode ?night finger -keyb/v/h -nav/h}
    
04-28 21:44:46.113 450-13973/? I/ActivityManager: Restarting because process died: ActivityRecord{21ab1f80 u0 com.artandwords.thoughtoftheday/.activities.main.MainActivity}
    
04-28 21:44:46.113 450-13973/? W/ActivityManager: Exception when starting activity com.artandwords.thoughtoftheday/.activities.main.MainActivity
    
    android.os.DeadObjectException
    
        at android.os.BinderProxy.transact(Native Method)
    
        at android.app.ApplicationThreadProxy.scheduleLaunchActivity(ApplicationThreadNative.java:730)
    
        at com.android.server.am.ActivityStack.realStartActivityLocked(ActivityStack.java:733)
    
        at com.android.server.am.ActivityStack.startSpecificActivityLocked(ActivityStack.java:840)
    
        at com.android.server.am.ActivityStack.resumeTopActivityLocked(ActivityStack.java:1790)
    
        at com.android.server.am.ActivityStack.resumeTopActivityLocked(ActivityStack.java:1449)
    
        at com.android.server.am.ActivityStack.startPausingLocked(ActivityStack.java:1058)
    
        at com.android.server.am.ActivityStack.finishActivityLocked(ActivityStack.java:3905)
    
        at com.android.server.am.ActivityStack.finishActivityLocked(ActivityStack.java:3837)
    
        at com.android.server.am.ActivityManagerService.handleAppCrashLocked(ActivityManagerService.java:8588)
    
        at com.android.server.am.ActivityManagerService.makeAppCrashingLocked(ActivityManagerService.java:8465)
    
        at com.android.server.am.ActivityManagerService.crashApplication(ActivityManagerService.java:9170)
    
        at com.android.server.am.ActivityManagerService.handleApplicationCrashInner(ActivityManagerService.java:8699)
    
        at com.android.server.am.NativeCrashListener$NativeCrashReporter.run(NativeCrashListener.java:86)
    
04-28 21:44:46.123 450-13973/? W/ContextImpl: Calling a method in the system process without a qualified user: android.app.ContextImpl.startService:1396 com.android.server.am.ActivityStack.sendActivityBroadcastLocked:4923 com.android.server.am.ActivityStack.removeActivityFromHistoryLocked:4089 com.android.server.am.ActivityStack.removeHistoryRecordsForAppLocked:4346 com.android.server.am.ActivityManagerService.handleAppDiedLocked:3163 
    
04-28 21:44:46.123 450-13973/? I/ActivityManager: Start proc com.artandwords.thoughtoftheday for activity com.artandwords.thoughtoftheday/.activities.main.MainActivity: pid=13975 
    
</unknown>

    Edit 1 :

    Still investigating and entered FFmpeg.java to the method loadBinary while debugging, which code I’ll paste below and the line making the crash is switch (CpuArchHelper.getCpuArch())

    @Override
    
public void loadBinary(FFmpegLoadBinaryResponseHandler ffmpegLoadBinaryResponseHandler) throws FFmpegNotSupportedException {
    
    String cpuArchNameFromAssets = null;
    
    switch (CpuArchHelper.getCpuArch()) {
    
        case x86:
    
            Log.i("Loading FFmpeg for x86 CPU");
    
            cpuArchNameFromAssets = "x86";
    
            break;
    
        case ARMv7:
    
            Log.i("Loading FFmpeg for armv7 CPU");
    
            cpuArchNameFromAssets = "armeabi-v7a";
    
            break;
    
        case NONE:
    
            throw new FFmpegNotSupportedException("Device not supported");
    
    }
    

    
    if (!TextUtils.isEmpty(cpuArchNameFromAssets)) {
    
        ffmpegLoadLibraryAsyncTask = new FFmpegLoadLibraryAsyncTask(context, cpuArchNameFromAssets, ffmpegLoadBinaryResponseHandler);
    
        ffmpegLoadLibraryAsyncTask.execute();
    
    } else {
    
        throw new FFmpegNotSupportedException("Device not supported");
    
    }
    
}

    I’ll keep on investigating...

    Edit 2 :

    Further debugging has just lead me to the exact line where app crashes, and it’s CpuArchHelper.java from FFmpeg library :

    The line causing the crash is the next :

    String archInfo = cpuNativeArchHelper.cpuArchFromJNI();

    and I cannot even go inside cpuArchFromJNI() with F7 as it just crashes.

    package com.github.hiteshsondhi88.libffmpeg;
    

    
import android.os.Build;
    

    
class CpuArchHelper {
    

    
    static CpuArch getCpuArch() {
    
        Log.d("Build.CPU_ABI : " + Build.CPU_ABI);
    
        // check if device is x86 or x86_64
    
        if (Build.CPU_ABI.equals(getx86CpuAbi()) || Build.CPU_ABI.equals(getx86_64CpuAbi())) {
    
            return CpuArch.x86;
    
        } else {
    
            // check if device is armeabi
    
            if (Build.CPU_ABI.equals(getArmeabiv7CpuAbi())) {
    
                ArmArchHelper cpuNativeArchHelper = new ArmArchHelper();
    
                String archInfo = cpuNativeArchHelper.cpuArchFromJNI();
    
                // check if device is arm v7
    
                if (cpuNativeArchHelper.isARM_v7_CPU(archInfo)) {
    
                    // check if device is neon
    
                    return CpuArch.ARMv7;
    
                }
    
                // check if device is arm64 which is supported by ARMV7
    
            } else if (Build.CPU_ABI.equals(getArm64CpuAbi())) {
    
                return CpuArch.ARMv7;
    
            }
    
        }
    
        return CpuArch.NONE;
    
    }
    

    
    static String getx86CpuAbi() {
    
        return "x86";
    
    }
    

    
    static String getx86_64CpuAbi() {
    
        return "x86_64";
    
    }
    

    
    static String getArm64CpuAbi() {
    
        return "arm64-v8a";
    
    }
    

    
    static String getArmeabiv7CpuAbi() {
    
        return "armeabi-v7a";
    
    }
    
}

    This is ArmArchHelper.java class :

    package com.github.hiteshsondhi88.libffmpeg;
    

    
class ArmArchHelper {
    
    static {
    
        System.loadLibrary("ARM_ARCH");
    
    }
    

    
    native String cpuArchFromJNI();
    

    
    boolean isARM_v7_CPU(String cpuInfoString) {
    
        return cpuInfoString.contains("v7");
    
    }
    

    
    boolean isNeonSupported(String cpuInfoString) {
    
        // check cpu arch for loading correct ffmpeg lib
    
        return cpuInfoString.contains("-neon");
    
    }
    

    
}

    Edit 3 :

    Reading carefully LogCat I’ve noticed there is a TransactionTooLarge Exception :

    04-28 21:44:46.103 450-13973/? W/ActivityManager: Exception thrown during pause
    
    android.os.TransactionTooLargeException
    
        at android.os.BinderProxy.transact(Native Method)
    
        at android.app.ApplicationThreadProxy.schedulePauseActivity(ApplicationThreadNative.java:642)
    
        at com.android.server.am.ActivityStack.startPausingLocked(ActivityStack.java:1007)
    
        at com.android.server.am.ActivityStack.finishActivityLocked(ActivityStack.java:3905)
    
        at com.android.server.am.ActivityStack.finishActivityLocked(ActivityStack.java:3837)
    
        at com.android.server.am.ActivityManagerService.handleAppCrashLocked(ActivityManagerService.java:8588)
    
        at com.android.server.am.ActivityManagerService.makeAppCrashingLocked(ActivityManagerService.java:8465)
    
        at com.android.server.am.ActivityManagerService.crashApplication(ActivityManagerService.java:9170)
    
        at com.android.server.am.ActivityManagerService.handleApplicationCrashInner(ActivityManagerService.java:8699)
    
        at com.android.server.am.NativeCrashListener$NativeCrashReporter.run(NativeCrashListener.java:86)

    Maybe this is what makes my app to crash, but I don’t know what to do with that, as it happens inside the FFMpeg library :s

    Edit 3 :

    As a note, I’ve tried in an old Android 4.2.2 (API 17) phone I also own and it’s working just fine, the video is generated without crashing.

  • Evolution #2173 (Résolu) : Date de création / publication

    13 janvier 2018, par nico d_

    J’ai ajouté la doc du plugin : https://contrib.spip.net/ecrire/?exec=article&id_article=4967

    Pas encore publiée, mais je propose de fermer ce ticket dès qu’elle le sera, et de continuer la discussion sur le forum du plugin sur contrib.

  • Streaming Video from RTMP to EMGUCV

    22 juillet 2017, par Isuru

    I’m trying to stream a webcam using RTMP to an EMGUCV project in order to process the video. I have set up a private RTMP server in a linux box using this tutorial,
    https://obsproject.com/forum/resources/how-to-set-up-your-own-private-rtmp-server-using-nginx.50/

    I’m testing the webcam stream using ffmpeg with the following commands,

    • Write to the rtmp server using,

      ffmpeg -y -f vfwcap -framerate 25 -video_size 640x480 -i 0 -an -f flv rtmp://rtmp-server:1935/live/stream

    • Read from the rtmp server using,
      ffplay -fflags nobuffer rtmp ://rtmp-server:1935/live/stream -loglevel verbose

    I’m able to write a simple OpenCV C++ application to read the stream and display it. Code below,

        cv::VideoCapture vcap;
    
    cv::Mat image;
    
    const std::string videoStreamAddress = "rtmp://rtmp-server:1935/live/stream";
    
    if(!vcap.open(videoStreamAddress)) {
    
        printf("Error opening video stream or file");
    
        return -1;
    
    }
    

    
    cv::namedWindow("Output Window");
    
    cv::Mat edges;
    
    for(;;) {
    
        if(!vcap.read(image)) {
    
            printf("No frame");
    
            cv::waitKey();
    
        }
    
        cv::imshow("Output Window", image);
    
        if(cv::waitKey(1) >= 0) break;
    
    }
    
return 0;

    The above code works properly. However when I try it using EMGUCV C#, I get the error message
    unable to create to capture from rtmp://rtmp-server:1935/live/stream

    This is my C# Code,

        public partial class MainForm : Form
    
    {
    
        private static Capture _cameraCapture;
    

    
        public MainForm()
    
        {
    
            InitializeComponent();
    
            Run();
    
        }
    

    
        void Run()
    
        {
    
            try
    
            {
    
                _cameraCapture = new Capture("rtmp://192.168.56.101:1935/live/stream");                
    
            }
    
            catch (Exception e)
    
            {
    
                MessageBox.Show(e.Message);
    
                return;
    
            }            
    
        }
    
   }

    Do I need a specific build of EMGUCV with FFMPEG or is RTMP capturing not available in EMGUCV ?

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