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No video background - only black screen

April 30, 2017 - 9:28am #1
Topic solved

Hi everyone,

I have a problem running latest Vuforia samples.

When I run them on HTC Nexus 9 device (Android 7.1.1) everything is fine. But when I run them on Samsung SM-T560 (Android 4.4.4) device there is no video background - only black screen. However, the targets are correctly detected (but not shown). 

I faced this problem when I tried to run my app on different devices. I though the problem was the way I am using Vuforia library, but then I ran samples and the problem was still there. If there is a way to fix this and somebody knows how, that would be very nice. 

AttachmentSize
Plain text icon VuforiaSamples_log.txt74.05 KB

No video background - only black screen

June 6, 2017 - 11:47am #13

When I installed your APK it worked.

So I compared your project structure to mine and I realized that I didn't install samples in the right folder (vuforia-sdk-android-6-2-10/samples). Even though I did reference vuforia sdk from app/build.gradle (def VUFORIA_SDK_DIR = '...') it was still a problem for some reason (I probably did some other configuration mistake).

This still didn't help to get my application to work, but luckily I found where the problem was - I used GLSurfaceView instead of SampleApplicationGLView. Now everything works fine. Thank you for all your help. 

No video background - only black screen

May 23, 2017 - 10:29am #12

Hello,

All I did was download the Vuforia 6.2.10 Android SDK and the 6.2.10 core samples for Android, create the project in Studio, and build/deploy the APK.

For your convenience, here is a ZIP of the entire project (including SDK). Beware the file is rather large: https://www.dropbox.com/s/g9ph54a7uc9kgks/vuforia-sdk-android-6-2-10.zip?dl=0

Additionally, here is the APK generated from the project that I tested (the same can be found in the aforementioned ZIP): https://www.dropbox.com/s/2di97ndnjrnmbo6/VuforiaSamples-6-2-10-debug.apk?dl=0

Thanks.

No video background - only black screen

May 23, 2017 - 2:18am #11

Thank you very much for your efforts.

As a final attempt to try to resolve the problem could you please share your test code so that I can check if it works on my device?

Thank you in advance.

 

 

No video background - only black screen

May 18, 2017 - 6:30pm #10

Hello,

Unfortunately I was not able to replicate the issue with the device that I received. I've attached some screen shots.

At this point I don't know how to proceed as I feel like we've exhausted all possibilities. Let me know if you have any suggestions.

Thanks.


No video background - only black screen

May 13, 2017 - 8:18am #9

Okay, great. Thank you for all your assistance and please keep me updated.

No video background - only black screen

May 11, 2017 - 4:27pm #8

Hello,

We would certainly like to investigate the issue, but it is difficult without being able to reproduce it locally and provide the data to our dev team. To do this, we need a similar device that exhibits the behavior you're observing. I've yet to find one that exactly matches the model name and OS version. Here's a Galaxy Tab E that seems to run Android 4 (hopefully), but is not the same model number (SM-T561). However, from this comparison, it does look to be the same hardware:

http://pdadb.net/index.php?m=device&s=compare&ids=9108.8304.8301

We'll go ahead and order it with the hopes that your issue can be reproduced. but I cannot be definitive about the availability of a patch at this time.

Thanks.

 

No video background - only black screen

May 11, 2017 - 12:14pm #7

Yes, I am sure that the device is not using custom ROM.

Apparently, only US and Canadian models have Android 5 - https://en.wikipedia.org/wiki/Samsung_Galaxy_Tab_E_9.6

Is there any chance that a patch for this specific device with Android 4 will be uploaded? If no, do you have any advice on how to approach this problem?

Thanx in advance.

 

No video background - only black screen

May 9, 2017 - 3:41pm #6

Hello,

Thanks for the test. Very strange that it looks like it is attempting to use Camera2, yet I don't believe it was Camera2 was not introduced until Android 5.

Are you sure that this device is not using a custom ROM? I ask because the specs I can find on the device list the minimum OS shipped was Android 5:

http://pdadb.net/index.php?m=device&id=8304&c=samsung_sm-t560_galaxy_tab_e_9.6_wifi

http://pdadb.net/index.php?m=device&id=9108&c=samsung_sm-t560_galaxy_tab_e_nook_edition_9.6

Thanks.

No video background - only black screen

May 9, 2017 - 2:05am #5

Hello,

thank you for the answer. Unfortunately after following your steps I still don't see the camera background.

I am not sure if I had to download new vuforia-sdk-android and new vuforia-samples-core-android but I did use an unmodified version of Vuforia Image Targets sample.

No video background - only black screen

May 2, 2017 - 11:29am #4

Hello,

Thanks for the information. Unfortunately, I cannot determine why this error is happening based upon the logs provided.

As an experiment, I have uploaded a device specific patch for the SM-T560 running Vuforia 6.2.X and Android API 19. To load the patch, please take the following steps using an unmodified version of Vuforia's ImageTargets sample app:

  1. Uninstall Vuforia ImageTargets sample from SM-T560 (if currently installed)
  2. Enable Wifi on SM-T560
  3. Verify Internet connectivity (by searching something on Google)
  4. Install unmodified version of ImageTargets on SM-T560
  5. Start ImageTargets and allow to run for 30 seconds (this allows the patch to be downloaded)
  6. Stop ImageTargets
  7. Restart ImageTargets

As before, please log the results and let me know if you still observe the black screen after step #7.

Thank you for your assistance.

 


No video background - only black screen

May 2, 2017 - 5:51am #3

Hi,

here are all the info:

1. Model number: SM-T560

2. Vuforia version: vuforia-sdk-android-6-2-10

3. Native

Thank you.

No video background - only black screen

May 1, 2017 - 1:04pm #2

Hello,

Thank you for the report. Upon inspection, there looks to be an error during initialization that I cannot explain.

If you can please answer the following questions it could help to narrow down the issue:

  1. What is the exact string in About phone (or About device)->Model number
  2. What version of Vuforia are you running
  3. Native? Or Unity?
  4. If Unity, which version of the Editor are you using

Thanks.

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