Streamon Error

[kherath6]

I'm trying to use the streamon function, it seems to open up, however it gives me an error message and the programs stops.

My code is given below, would appreciate a response on a possible fix.

from easytello import tello
mytello = tello.Tello()
Sending command: command
Response: b'ok'
tello.streamon()
Traceback (most recent call last):
File "", line 1, in
AttributeError: module 'easytello.tello' has no attribute 'streamon'
mytello.streamon()
Sending command: streamon
Response: b'ok'
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] decode_slice_header error
[h264 @ 0x7fb3aa252e00] no frame!
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] decode_slice_header error
[h264 @ 0x7fb3aa252e00] no frame!
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] decode_slice_header error
[h264 @ 0x7fb3aa252e00] no frame!
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] decode_slice_header error
[h264 @ 0x7fb3aa252e00] no frame!
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] decode_slice_header error
[h264 @ 0x7fb3aa252e00] no frame!
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] decode_slice_header error
[h264 @ 0x7fb3aa252e00] no frame!
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] decode_slice_header error
[h264 @ 0x7fb3aa252e00] no frame!
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] non-existing PPS 0 referenced
[h264 @ 0x7fb3aa252e00] decode_slice_header error
[h264 @ 0x7fb3aa252e00] no frame!
2019-07-12 23:18:32.655 python[54965:1536194] WARNING: NSWindow drag regions should only be invalidated on the Main Thread! This will throw an exception in the future. Called from (
0 AppKit 0x00007fff400d67eb -[NSWindow(NSWindow_Theme) _postWindowNeedsToResetDragMarginsUnlessPostingDisabled] + 378
1 AppKit 0x00007fff400d3bdb -[NSWindow _initContent:styleMask:backing:defer:contentView:] + 1479
2 AppKit 0x00007fff40192f95 -[NSPanel _initContent:styleMask:backing:defer:contentView:] + 50
3 AppKit 0x00007fff400d360e -[NSWindow initWithContentRect:styleMask:backing:defer:] + 45
4 AppKit 0x00007fff40192f4a -[NSPanel initWithContentRect:styleMask:backing:defer:] + 64
5 QtGui 0x00000001091981fc -[QCocoaPanel initWithContentRect:styleMask:backing:defer:] + 76
6 QtGui 0x000000010919ea81 -[NSWindow(QWidgetIntegration) qt_initWithQWidget:contentRect:styleMask:] + 81
7 QtGui 0x00000001091900da _ZL20qt_mac_create_windowP7QWidgetjmRK5QRect + 423
8 QtGui 0x000000010918fd6a _ZN14QWidgetPrivate18qt_create_root_winEv + 64
9 QtGui 0x0000000109191af3 _ZN14QWidgetPrivate10create_sysElbb + 917
10 QtGui 0x00000001092217fc _ZN7QWidget6createElbb + 580
11 QtGui 0x000000010922051c _ZN14QWidgetPrivate4initEP7QWidget6QFlagsIN2Qt10WindowTypeEE + 362
12 QtGui 0x0000000109220309 _ZN7QWidgetC2EPS_6QFlagsIN2Qt10WindowTypeEE + 121
13 QtGui 0x00000001091a9c03 _ZN14QDesktopWidgetC2Ev + 31
14 QtGui 0x00000001091ebdd4 _ZN12QApplication7desktopEv + 50
15 QtGui 0x00000001091a5cae _Z9flipPointRK7CGPoint + 32
16 QtGui 0x0000000109185af8 _ZN7QCursor3posEv + 46
17 QtGui 0x00000001091fb3f5 _ZN11QMouseEventC2EN6QEvent4TypeERK6QPointN2Qt11MouseButtonE6QFlagsIS6_ES7_INS5_16KeyboardModifierEE + 79
18 QtGui 0x00000001096c4204 _ZN20QGraphicsViewPrivateC2Ev + 296
19 QtGui 0x00000001096c76c5 _ZN13QGraphicsViewC2EP7QWidget + 37
20 cv2.cpython-37m-darwin.so 0x000000010382db2f _ZN15DefaultViewPortC2EP8CvWindowi + 31
21 cv2.cpython-37m-darwin.so 0x00000001038291bd _ZN8CvWindowC2E7QStringi + 397
22 cv2.cpython-37m-darwin.so 0x0000000103820ed3 _ZN11GuiReceiver12createWindowE7QStringi + 227
23 cv2.cpython-37m-darwin.so 0x0000000103820d35 cvNamedWindow + 533
24 cv2.cpython-37m-darwin.so 0x0000000103823308 _ZN11GuiReceiver9showImageE7QStringPv + 168
25 cv2.cpython-37m-darwin.so 0x00000001038231be cvShowImage + 558
26 cv2.cpython-37m-darwin.so 0x000000010381bb8f _ZN2cv6imshowERKNSt3__112basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEERKNS_11_InputArrayE + 463
27 cv2.cpython-37m-darwin.so 0x0000000102c5e318 ZL18pyopencv_cv_imshowP7_objectS0_S0 + 424
28 python 0x00000001021f91b8 _PyMethodDef_RawFastCallKeywords + 392
29 python 0x0000000102335e42 call_function + 306
30 python 0x0000000102333aec _PyEval_EvalFrameDefault + 46092
31 python 0x00000001021f88d5 function_code_fastcall + 117
32 python 0x00000001021fbce2 method_call + 130
33 python 0x00000001021f9752 PyObject_Call + 130
34 python 0x0000000102333d58 _PyEval_EvalFrameDefault + 46712
35 python 0x00000001021f88d5 function_code_fastcall + 117
36 python 0x0000000102335dc7 call_function + 183
37 python 0x0000000102333a56 _PyEval_EvalFrameDefault + 45942
38 python 0x00000001021f88d5 function_code_fastcall + 117
39 python 0x0000000102335dc7 call_function + 183
40 python 0x0000000102333a56 _PyEval_EvalFrameDefault + 45942
41 python 0x00000001021f88d5 function_code_fastcall + 117
42 python 0x00000001021fbce2 method_call + 130
43 python 0x00000001021f9752 PyObject_Call + 130
44 python 0x00000001024178cb t_bootstrap + 123
45 python 0x000000010239e707 pythread_wrapper + 39
46 libsystem_pthread.dylib 0x00007fff6eaf32eb _pthread_body + 126
47 libsystem_pthread.dylib 0x00007fff6eaf6249 _pthread_start + 66
48 libsystem_pthread.dylib 0x00007fff6eaf240d thread_start + 13
)
2019-07-12 23:18:32.726 python[54965:1536194] WARNING: nextEventMatchingMask should only be called from the Main Thread! This will throw an exception in the future.
2019-07-12 23:18:32.726 python[54965:1536194] *** Assertion failure in +[NSUndoManager _endTopLevelGroupings], /BuildRoot/Library/Caches/com.apple.xbs/Sources/Foundation/Foundation-1575.12/Foundation/Misc.subproj/NSUndoManager.m:361
2019-07-12 23:18:32.728 python[54965:1536194] *** Assertion failure in +[NSUndoManager _endTopLevelGroupings], /BuildRoot/Library/Caches/com.apple.xbs/Sources/Foundation/Foundation-1575.12/Foundation/Misc.subproj/NSUndoManager.m:361
2019-07-12 23:18:32.732 python[54965:1536194] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '+[NSUndoManager(NSInternal) _endTopLevelGroupings] is only safe to invoke on the main thread.'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff42a87cfd __exceptionPreprocess + 256
1 libobjc.A.dylib 0x00007fff6d131a17 objc_exception_throw + 48
2 CoreFoundation 0x00007fff42aa2a1a +[NSException raise:format:arguments:] + 98
3 Foundation 0x00007fff44d41c85 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 194
4 Foundation 0x00007fff44c74cfa +[NSUndoManager(NSPrivate) _endTopLevelGroupings] + 473
5 AppKit 0x00007fff4004f915 -[NSApplication run] + 916
6 QtGui 0x00000001091abe44 _ZN26QEventDispatcherMacPrivate22ensureNSAppInitializedEv + 128
7 QtGui 0x00000001091ab5ff _ZN19QEventDispatcherMac13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE + 777
8 QtCore 0x0000000109e0dfdc _ZN16QCoreApplication13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE + 80
9 cv2.cpython-37m-darwin.so 0x00000001038208ef cvWaitKey + 207
10 cv2.cpython-37m-darwin.so 0x0000000103820ef7 _ZN11GuiReceiver12createWindowE7QStringi + 263
11 cv2.cpython-37m-darwin.so 0x0000000103820d35 cvNamedWindow + 533
12 cv2.cpython-37m-darwin.so 0x0000000103823308 _ZN11GuiReceiver9showImageE7QStringPv + 168
13 cv2.cpython-37m-darwin.so 0x00000001038231be cvShowImage + 558
14 cv2.cpython-37m-darwin.so 0x000000010381bb8f _ZN2cv6imshowERKNSt3__112basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEERKNS_11_InputArrayE + 463
15 cv2.cpython-37m-darwin.so 0x0000000102c5e318 ZL18pyopencv_cv_imshowP7_objectS0_S0 + 424
16 python 0x00000001021f91b8 _PyMethodDef_RawFastCallKeywords + 392
17 python 0x0000000102335e42 call_function + 306
18 python 0x0000000102333aec _PyEval_EvalFrameDefault + 46092
19 python 0x00000001021f88d5 function_code_fastcall + 117
20 python 0x00000001021fbce2 method_call + 130
21 python 0x00000001021f9752 PyObject_Call + 130
22 python 0x0000000102333d58 _PyEval_EvalFrameDefault + 46712
23 python 0x00000001021f88d5 function_code_fastcall + 117
24 python 0x0000000102335dc7 call_function + 183
25 python 0x0000000102333a56 _PyEval_EvalFrameDefault + 45942
26 python 0x00000001021f88d5 function_code_fastcall + 117
27 python 0x0000000102335dc7 call_function + 183
28 python 0x0000000102333a56 _PyEval_EvalFrameDefault + 45942
29 python 0x00000001021f88d5 function_code_fastcall + 117
30 python 0x00000001021fbce2 method_call + 130
31 python 0x00000001021f9752 PyObject_Call + 130
32 python 0x00000001024178cb t_bootstrap + 123
33 python 0x000000010239e707 pythread_wrapper + 39
34 libsystem_pthread.dylib 0x00007fff6eaf32eb _pthread_body + 126
35 libsystem_pthread.dylib 0x00007fff6eaf6249 _pthread_start + 66
36 libsystem_pthread.dylib 0x00007fff6eaf240d thread_start + 13
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Abort trap: 6

[ezrafielding]

Hi, what OS are you using? This seems to be an issue with calling openCV so the environment may come into play

[kherath6]

Hi Virodroid,

I'm using Mac os.
I have all the packages installed in the environment.

[ezrafielding]

I haven't been able to test easyTello on MacOS yet. Perhaps it doesn't like the way I'm calling OpenCV. I'll see if I can track down a Mac to do some testing on in future. Everything seems to work fine on Windows 10 and Ubuntu

[acdgr8]

Comments
@0bscur3
0bscur3 commented 13 days ago

Hi,

I was trying to get the example.py to work, but video stream does not seem to work. I am using python 3.6.9 on Mac OS.

This is my stdout:

pygame 1.9.4
Hello from the pygame community. https://www.pygame.org/contribute.html
Send command: command
Response: ok
Send command: speed 10
Response: ok
Send command: streamoff
Response: ok
Send command: streamon
Response: ok
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] non-existing PPS 0 referenced
[h264 @ 0x7f86968c6600] decode_slice_header error
[h264 @ 0x7f86968c6600] no frame!
[h264 @ 0x7f869801c800] error while decoding MB 48 23, bytestream -5
[h264 @ 0x7f869801fe00] error while decoding MB 30 41, bytestream -8

Thanks!
@acdgr8
acdgr8 commented 1 hour ago

Hi, I'm getting a similar error when trying to switch on the stream. Interestingly, I am able to extract frames out of it using the following code -
from djitellopy import Tello
import cv2
import time
tello =Tello()
tello.connect()
tello.takeoff()
tello.streamon()
count = 0
vidcap = cv2.VideoCapture(tello.get_udp_video_address())
success,image = vidcap.read()
success = True
while success:
vidcap.set(cv2.CAP_PROP_POS_MSEC,(count*1000))
success,image = vidcap.read()
print ('Read a new frame: ', success)
cv2.imwrite("./img/frame%d.jpg" % count, image) # save frame as JPEG file
count = count + 5

And the frames are being stored correctly. Can someone please help out why the videostream is not being displayed in a separate window.
Thanks in advance!

[tomschofield]

Exactly the same issue here. Any progress on this please?

[rdarmoul]

Me too, I try too run it with macOS,
h264 @ 0x7f99b384ac00] non-existing PPS 0 referenced [h264 @ 0x7f99b384ac00] non-existing PPS 0 referenced [h264 @ 0x7f99b384ac00] decode_slice_header error [h264 @ 0x7f99b384ac00] no frame! [h264 @ 0x7f99b384ac00] non-existing PPS 0 referenced [h264 @ 0x7f99b384ac00] non-existing PPS 0 referenced [h264 @ 0x7f99b384ac00] decode_slice_header error [h264 @ 0x7f99b384ac00] no frame! .... and so on

[manujimele]

Me too, I try too run it with macOS,
h264 @ 0x7f99b384ac00] non-existing PPS 0 referenced [h264 @ 0x7f99b384ac00] non-existing PPS 0 referenced [h264 @ 0x7f99b384ac00] decode_slice_header error [h264 @ 0x7f99b384ac00] no frame! [h264 @ 0x7f99b384ac00] non-existing PPS 0 referenced [h264 @ 0x7f99b384ac00] non-existing PPS 0 referenced [h264 @ 0x7f99b384ac00] decode_slice_header error [h264 @ 0x7f99b384ac00] no frame! .... and so on

Tengo el mismo problema.... ¿Has encontrado alguna solución?
Gracias

[ricafort]

@Virodroid i get the same errors and issue. seems like all 3rd party tello libraries needs to be updated, maybe caused by latest tello firmware update

[faaip]

Having the same issue here. Any news on this?

[ramujin]

@Virodroid any updates on this issue?

[ezrafielding]

Unfortunately, I'm not currently in possession of a DJI Tello to continue development of this library. So I won't be able to make or test any updates going forward. That's why this repo isn't really under "active" development anymore.

[skomatin]

Turns out the issue for me was that opencv was opening windows in a separate thread. MacOS does not allow (or work well with) GUI operations outside the main thread. Workaround was to move all GUI operations to the main thread.