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Droid webcam video disappear and app crash quickly after startup

Discussion in 'Android Apps & Games' started by sand1, Dec 5, 2021.

  1. sand1

    sand1 Lurker
    Thread Starter

    I have installed droidwebcam client on android 5.5 and Windows 7 about month
    ago. Finally I achieved to see the picture from my samsung galaxy smartphone on
    PC droid client as well as in the Skype settings video camera. As my mobile internet
    speed was slow I was unable to test the video. This week I switched to LTE mobile
    internet so it is enough to stream some video. I needed to have Google
    Meet talk so I decided to check it beforehand using video testing (GM preview)
    in browser on this service.
    Indeed after some incorrect attempts to get video (picture) on PC screen and GM preview,
    I found correct way, I then stumbled upon permanent video disappearing and PC DroidCamApp crash after several seconds of rendering in Google Meet video testing screen. The error in app events logs - show the crashing module ntdll.dll (C:\Windows\SYSTEM32\ntdll.dll) for
    It happens permanently in last two days. I tried to uninstall and reinstall new ntdll,
    but uninstalling and installing in cmd is not possible, but manual replacement
    did not changed nothing in this crash appearing, as well as new DroidCamApp PC
    client installation and re-installation the same but latest 6.5.2 version.
    I also changed app adb folder with latest adb.exe, AdbWinApi.dll, AdbWinUsbApi.dll,
    but no changes.
    What could be the reason? What I can do? Maybe it is deeply connected with video
    card obsolete issues in ntdll that is not resolvable.
    I used such steps to set this video phone-pc interaction:
    1) Connect Phone to PC;
    2) Enable USB debugging in Android Developers Menu;
    3) Open Droidapp on Android;
    4) Open DroidApp PC client;
    5) Setting usb option on PC client
    6) Starting video;
    After appearing this video could disappearing
    for some time on PC client, then appear
    again. But after launching Google Meet test
    video, it hangs after several seconds and
    cover lower part in grey of video screen.
    And I cannot capture video for test.
    I suppose that direct video connection in GM
    in this way would be also intermittent
    and closed quickly as I tested it also
    for Zoom two days ago so the video screen
    was also partly covered by grey and video stopped
    I tried first this official guide -Connect via USB (Android) -https://www.dev47apps.com/droidcam/connect/
    where there is instruction to open pc client at first,
    but it was more error-prone, with messages that
    "check if app is ready and open" and "if the same ip"
    as it also happened in another cases. And I noted that
    "Allow USB Debugging" almost not appearing in case
    I open android app first and randomly when I launch
    PC client first, indeed month ago it happened to be.
    But it seem the issue is not in the order of connecting
    but in swift video disruption in Google Meet at least
    and feeble video in PC client and subsequent crash
    (due ntdll.dll) as it could disappear and reappear even until it.
    What can I do and what could be the reason of it?

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  2. Unforgiven

    Unforgiven ...eschew obfuscation...

    I added this to the droidcam channel. Good luck getting it sorted. :)
    olbriar likes this.
  3. sand1

    sand1 Lurker
    Thread Starter

    I should also note such moments, that the DroidCamApp.exe (on PC)
    is very unstable, it could even three times to lose the video and then
    produce it again, until there would be final intermittence in the subsequent
    Google Meet testing screen (video appear there for very short time, indeed it could also reappear but not for long). So I do understand that video over usb cable
    could be the reason, maybe low voltage, or some deficiency, that does not allow
    to get full and qualitative dynamic picture from smartphone client, where original
    video is more stable and qualitative (indeed I use finely this usb cable for charging
    as from power supply as well from PC usb port, despite in latter case the current is far from expected, 120 ma instead desirable 1a).
    I also tested the changing the way to allow usb debugging after opening
    PC and android app, that produced prompt for "Allow USB Debugging"
    that is necessary in droidcam. Indeed it lead predominantly to blue screen
    "IRQL not equal or less" (ntoskrn.exe, BCCode:a, BCP4:82CA736F), when video should be started at DroidCamApp.exe or when it should be appeared on Google Meet Screen some time later. Moreover after this BSOD (probably connected with
    memory issues or USB) my Chrome browser started easily to broke with just
    several tabs present yesterday that is unusual even with more tabs open.
    So maybe this video wreckage is due to low memory on my PC, I just supposed?
    Maybe due to it is grey lower half on Google Meet screen as it is second
    video channel created on PC.
    I have just three DDR1 500mbs memory stick (1,5 Gb), and when I open Chrome,
    that is necessary for Google Meet, the memory usage go to 1,2 GB level,
    and often the messages about low memory appear. In such time it is difficult to find additional 4-th old memory stick, and I do not know how much memory would be needed. In this course, when I was able to capture short Google Meet testing video, the quality of playback was really bad, far worse as it is viewed on PC client and in Google Meet screen. Is it due also to low memory? Old video-card? Because such quality is not relevant for video-interview in no way.
    Except it in the course of this BSOD, or without it, I also got often DroidCamApp.exe crash at the very start, connected with ucrtbase.dll,
    that lead to adb.exe crash initially.
    To check more options I also deinstalled and installed Samsung Android USB driver, but it did not changed nothing.
    So if the reason is in low memory as "IRQL not equal or less" blue screen is related with it, and check of system files does not find nothing faulty, how much memory I need for droidwebcam? Is phone camera video buffered in PC memory? What I can check else, for example video transfer over usb cable? Could this memory issue to appear even I buy simple budget web-camera instead to use droidcam?
    #3 sand1, Dec 6, 2021
    Last edited: Dec 6, 2021
  4. puppykickr

    puppykickr Android Expert

    mikedt likes this.
  5. mikedt

    mikedt 你好

    This sounds like a classic case of "DLL Hell", which has always been problem with Windows.
    FYI: https://www.techopedia.com/definition/27700/dll-hell

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October 1, 2021
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