DASH video frame capture

[František Kadúch]

Hi all,

I am trying to grab the video frames from a DASH manifest video stream.Here is my code for an Android app

String asset_url = "https://.../manifest.mpd";
FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(asset_url);
AndroidFrameConverter converterToBitmap = new AndroidFrameConverter();

try
{

grabber.setFormat("mp4");
grabber.start();

for ( int frameCount = 0; frameCount < grabber.getLengthInVideoFrames();       frameCount++ )
 { 
     Frame nthFrame = grabber.grabImage(); 
     Bitmap bitmap = converterToBitmap.convert(nthFrame); 
     saveImageToInternalStorage(bitmap, "test" + nthFrame);
 }
}
catch ( FrameGrabber.Exception e )
{
e.printStackTrace();
}

But I am getting this error:

2020-11-30 14:42:03.065 31125-31125/sk.satro.javacvtest W/System.err: org.bytedeco.javacv.FrameGrabber$Exception: avformat_open_input() error -5: Could not open input "https://sec-stream1.stream.satro.sk/vod2/_definst_/amlst:markiza/56827144_20201130094402/manifest.mpd". (Has setFormat() been called?)

2020-11-30 14:42:03.068 31125-31125/sk.satro.javacvtest W/System.err:     at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:876)

2020-11-30 14:42:03.070 31125-31125/sk.satro.javacvtest W/System.err:     

...

So the question is how to initialize FFmpegFrameGrabber and what format string to pass to the setFormat() call?

thanks

Frantisek

[Samuel Audet]

Please make sure FFmpegLogCallback.set() has been called. You'll
probably get more information about the error in the log that way.

[Samuel Audet]

This is a network problem. Fix your network and it should work.

On 12/3/20 9:22 PM, František Kadúch wrote:
> 2020-12-03 13:14:55.646 8632-8632/sk.satro.javacvtest W/System.err: Error: [tcp @ 0x7985c11100] Failed to resolve hostname sec-stream1.stream.satro.sk <http://sec-stream1.stream.satro.sk>: No address associated with hostname
> 2020-12-03 13:14:55.647 8632-8632/sk.satro.javacvtest W/System.err: Error: [tcp @ 0x7985c11100] Failed to resolve hostname sec-stream1.stream.satro.sk <http://sec-stream1.stream.satro.sk>: No address associated with hostname

[František Kadúch]

Ok, thanks. But does the library work with https, I mean does it have support for SSL?

št 3. 12. 2020 o 13:28 Samuel Audet <samuel...@gmail.com> napísal(a):

[Samuel Audet]

That class isn't available on Android. Do not set the
"org.bytedeco.javacpp.mxbean" system property and it will work fine.

On 12/3/20 9:49 PM, František Kadúch wrote:
> I appreciate your help, fixed network access, but now I am getting
> different error. Could you please kindly take a look at it ?
>
> 2020-12-03 13:45:02.198 9155-9155/sk.satro.javacvtest I/atro.javacvtes: Rejecting re-init on previously-failed class
> java.lang.Class<org.bytedeco.javacpp.tools.PointerBufferPoolMXBean>: java.lang.NoClassDefFoundError: Failed resolution of: Ljava/lang/management/BufferPoolMXBean;

[Samuel Audet]

Well, I can't reproduce that error here, so it's going to be hard for me to debug this.

You're also the only person I ever heard that is having a problem like that...

In any case, please post an issue about it on GitHub for tracking purposes:

    https://github.com/bytedeco/javacpp/issues

One way for sure to fix this would be to recompile your own version of JavaCPP without that class.

On 12/3/20 10:19 PM, František Kadúch wrote:

I added this code m but the same error still persists:

 Caused by: java.lang.ClassNotFoundException: Didn't find class "java.lang.management.BufferPoolMXBean" on path: DexPathList[[zip file "/data/app/sk.satro.javacvtest-BiGXp6EGnKmfOskri925_g==/base.apk"],nativeLibraryDirectories=[/data/app/sk.satro.javacvtest-BiGXp6EGnKmfOskri925_g==/lib/arm64, /data/app/sk.satro.javacvtest-BiGXp6EGnKmfOskri925_g==/base.apk!/lib/arm64-v8a, /system/lib64]]

System.clearProperty("org.bytedeco.javacpp.mxbean");
System.out.println("org.bytedeco.javacpp.mxbean" + " = " + System.getProperty("org.bytedeco.javacpp.mxbean"));

String asset_url = "https://sec-stream1.stream.satro.sk/vod2/_definst_/amlst:markiza/56827144_20201130094402/manifest.mpd";

FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(asset_url);

grabber.setFormat("mp4");
FFmpegLogCallback.set();

AndroidFrameConverter converterToBitmap = new AndroidFrameConverter();

thanks

Frantisek

št 3. 12. 2020 o 13:54 Samuel Audet <samuel...@gmail.com> napísal(a):

[František Kadúch]

Ok, I'll do that. But still would like to know, if the javacpp,jar is needed for the sake of just grabbing the frames.

thanks

št 3. 12. 2020 o 15:14 Samuel Audet <samuel...@gmail.com> napísal(a):