OpenCV Version Detection Fails with cv2 4.5.1-dev

[plauthor]

The program will not open a video:

`$ scenedetect -i detroit.avi detect-content list-scenes -n
[PySceneDetect] PySceneDetect v0.5.5
[ERROR:0] global /tmp/pip-install-mfmkpqew/opencv-python/opencv/modules/videoio/src/cap.cpp (142) open VIDEOIO(CV_IMAGES): raised OpenCV exception:

OpenCV(4.5.1) /tmp/pip-install-mfmkpqew/opencv-python/opencv/modules/videoio/src/cap_images.cpp:253: error: (-5:Bad argument) CAP_IMAGES: can't find starting number (in the name of file): detroit.avi in function 'icvExtractPattern'

[PySceneDetect] Could not parse CLI options.: could not open video.
Failed to open the following video file:
detroit.avi
Usage: scenedetect [OPTIONS] COMMAND1 [ARGS]... [COMMAND2 [ARGS]...]...

Error: Invalid value for input video: could not open video.
Failed to open the following video file:
detroit.avi`

It was installed with 'pip3 install scenedetect[opencv]' on Debian 10 stable. ffplay does open the video as well as other applications do, but scenedetect will not open any other videos at all. opencv does open images though. Is there any way to cope with this please. Thank you.

[Breakthrough]

Hi @plauthor; What version of Python are you running? Did you install the OpenCV Python library manually? From a Python interactive prompt, could you provide the output of the following: import cv2 print cv2.getBuildInformation() This will show if your installed version of OpenCV has the correct video backend. It seems like OpenCV is trying to use the image sequence backend, which it only defaults to if it could not use ffmpeg/gstreamer to open the AVI - this implies that there's either a conflicting package on your system, or that the OpenCV binary that you have installed is lacking the proper backend. See [this related question]( https://stackoverflow.com/questions/60651352/cvvideocaptureopen-videoiocv-images-raised-opencv-exception) on StackOverflow for details. After providing the output above, I would also suggest trying to uninstall and reinstall OpenCV via `pip` - in particular, double check that it uses the correct binary distribution for your system. If it builds from source, ensure that you are building with `ffmpeg` support enabled. Thanks!

…

On Wed, Feb 3, 2021 at 7:27 AM plauthor ***@***.***> wrote: The program will not open a video: `$ scenedetect -i detroit.avi detect-content list-scenes -n [PySceneDetect] PySceneDetect v0.5.5 [ERROR:0] global /tmp/pip-install-mfmkpqew/opencv-python/opencv/modules/videoio/src/cap.cpp (142) open VIDEOIO(CV_IMAGES): raised OpenCV exception: OpenCV(4.5.1) /tmp/pip-install-mfmkpqew/opencv-python/opencv/modules/videoio/src/cap_images.cpp:253: error: (-5:Bad argument) CAP_IMAGES: can't find starting number (in the name of file): detroit.avi in function 'icvExtractPattern' [PySceneDetect] Could not parse CLI options.: could not open video. Failed to open the following video file: detroit.avi Usage: scenedetect [OPTIONS] COMMAND1 [ARGS]... [COMMAND2 [ARGS]...]... Error: Invalid value for input video: could not open video. Failed to open the following video file: detroit.avi` It was installed with 'pip3 install scenedetect[opencv]' on Debian 10 stable. ffplay does open the video as well as other applications do, but scenedetect will not open any other videos at all. opencv does open images though. Is there any way to cope with this please. Thank you. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#206>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAA6TBEERBAIRC4OZTU2H4LS5E6KFANCNFSM4XAYLVPA> .

[plauthor]

Hi Breakthrough,

this is the configuration. FFMPEG support is missing. OpenCV on its own behaves the same, no videos open, built-in camera capture works (but does not save it as a file), images work. I am cloning opencv github right now and will try and compile it myself, but cannot get ffmpeg-dev for debian 10 stable. Weird. How do I compile ffmpeg support into opencv then? Thank you.

`General configuration for OpenCV 4.5.1 =====================================
Version control: unknown

Platform:
Timestamp: 2021-02-02T17:30:35Z
Host: Linux 4.19.0-13-amd64 x86_64
CMake: 3.18.4
CMake generator: Unix Makefiles
CMake build tool: /usr/bin/make
Configuration: Release

CPU/HW features:
Baseline: SSE SSE2 SSE3
requested: SSE3
Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
SSE4_1 (15 files): + SSSE3 SSE4_1
SSE4_2 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2
FP16 (0 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
AVX (4 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
AVX2 (29 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
AVX512_SKX (4 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_COMMON AVX512_SKX

C/C++:
Built as dynamic libs?: NO
C++ standard: 11
C++ Compiler: /usr/bin/c++ (ver 8.3.0)
C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
C Compiler: /usr/bin/cc
C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
Linker flags (Release): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed
Linker flags (Debug): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed
ccache: NO
Precompiled headers: NO
Extra dependencies: ade /usr/lib/x86_64-linux-gnu/libgtk-3.so /usr/lib/x86_64-linux-gnu/libgdk-3.so /usr/lib/x86_64-linux-gnu/libpangocairo-1.0.so /usr/lib/x86_64-linux-gnu/libpango-1.0.so /usr/lib/x86_64-linux-gnu/libatk-1.0.so /usr/lib/x86_64-linux-gnu/libcairo-gobject.so /usr/lib/x86_64-linux-gnu/libcairo.so /usr/lib/x86_64-linux-gnu/libgdk_pixbuf-2.0.so /usr/lib/x86_64-linux-gnu/libgio-2.0.so /usr/lib/x86_64-linux-gnu/libgobject-2.0.so /usr/lib/x86_64-linux-gnu/libglib-2.0.so /usr/lib/x86_64-linux-gnu/libgthread-2.0.so /usr/lib/x86_64-linux-gnu/libpng.so /usr/lib/x86_64-linux-gnu/libz.so dl m pthread rt
3rdparty dependencies: ittnotify libprotobuf libjpeg-turbo libwebp libtiff libopenjp2 IlmImf quirc ippiw ippicv

OpenCV modules:
To be built: calib3d core dnn features2d flann gapi highgui imgcodecs imgproc ml objdetect photo python3 stitching video videoio
Disabled: world
Disabled by dependency: -
Unavailable: java python2 ts
Applications: -
Documentation: NO
Non-free algorithms: NO

GUI:
GTK+: YES (ver 3.24.5)
GThread : YES (ver 2.58.3)
GtkGlExt: NO
VTK support: NO

Media I/O:
ZLib: /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11)
JPEG: libjpeg-turbo (ver 2.0.6-62)
WEBP: build (ver encoder: 0x020f)
PNG: /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.36)
TIFF: build (ver 42 - 4.0.10)
JPEG 2000: build (ver 2.3.1)
OpenEXR: build (ver 2.3.0)
HDR: YES
SUNRASTER: YES
PXM: YES
PFM: YES

Video I/O:
DC1394: NO
FFMPEG: NO
avcodec: NO
avformat: NO
avutil: NO
swscale: NO
avresample: NO
GStreamer: NO
v4l/v4l2: YES (linux/videodev2.h)

Parallel framework: pthreads

Trace: YES (with Intel ITT)

Other third-party libraries:
Intel IPP: 2020.0.0 Gold [2020.0.0]
at: /tmp/pip-install-mfmkpqew/opencv-python/_skbuild/linux-x86_64-3.7/cmake-build/3rdparty/ippicv/ippicv_lnx/icv
Intel IPP IW: sources (2020.0.0)
at: /tmp/pip-install-mfmkpqew/opencv-python/_skbuild/linux-x86_64-3.7/cmake-build/3rdparty/ippicv/ippicv_lnx/iw
Lapack: NO
Eigen: NO
Custom HAL: NO
Protobuf: build (3.5.1)

OpenCL: YES (no extra features)
Include path: /tmp/pip-install-mfmkpqew/opencv-python/opencv/3rdparty/include/opencl/1.2
Link libraries: Dynamic load

Python 3:
Interpreter: /usr/bin/python3 (ver 3.7.3)
Libraries: /usr/lib/x86_64-linux-gnu/libpython3.7m.so (ver 3.7.3)
numpy: /tmp/pip-build-env-4m0qet_x/lib/python3.7/site-packages/numpy/core/include (ver 1.14.5)
install path: python

Python (for build): /usr/bin/python2.7

Java:
ant: NO
JNI: NO
Java wrappers: NO
Java tests: NO

Install to: /tmp/pip-install-mfmkpqew/opencv-python/_skbuild/linux-x86_64-3.7/cmake-install

`

[plauthor]

I am just trying to configure it with ffmpeg for compilation but there are some issues:

$ cmake -D WITH_FFMPEG=ON ..
-- Detected processor: x86_64
-- Looking for ccache - not found
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found suitable version "1.2.11", minimum required is "1.2.3")
-- Could NOT find OpenJPEG (minimal suitable version: 2.0, recommended version >= 2.3.1). OpenJPEG will be built from sources
-- OpenJPEG: VERSION = 2.3.1, BUILD = opencv-4.5.1-dev-openjp2-2.3.1
-- OpenJPEG libraries will be built from sources: libopenjp2 (version "2.3.1")
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.11")
-- Found OpenEXR: /usr/lib/x86_64-linux-gnu/libIlmImf.so
-- Found TBB (env): /usr/lib/x86_64-linux-gnu/libtbb.so
-- found Intel IPP (ICV version): 2020.0.0 [2020.0.0 Gold]
-- at: /home/q1/opencv/build/3rdparty/ippicv/ippicv_lnx/icv
-- found Intel IPP Integration Wrappers sources: 2020.0.0
-- at: /home/q1/opencv/build/3rdparty/ippicv/ippicv_lnx/iw
-- Could not find OpenBLAS include. Turning OpenBLAS_FOUND off
-- Could not find OpenBLAS lib. Turning OpenBLAS_FOUND off
-- Could NOT find Atlas (missing: Atlas_CBLAS_INCLUDE_DIR Atlas_CLAPACK_INCLUDE_DIR Atlas_CBLAS_LIBRARY Atlas_BLAS_LIBRARY Atlas_LAPACK_LIBRARY)
-- Could NOT find BLAS (missing: BLAS_LIBRARIES)
-- LAPACK requires BLAS
-- A library with LAPACK API not found. Please specify library location.
/bin/ant: 1: cd: can't cd to /bin/../share/ant/bin/..
Error: Could not find or load main class org.apache.tools.ant.launch.Launcher
Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.launch.Launcher
-- Could NOT find JNI (missing: JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH)
-- VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file
-- OpenCV Python: during development append to PYTHONPATH: /home/q1/opencv/build/python_loader
-- Checking for modules 'libavcodec;libavformat;libavutil;libswscale'
-- No package 'libavcodec' found
-- No package 'libavformat' found
-- No package 'libavutil' found
-- No package 'libswscale' found
-- FFMPEG is disabled. Required libraries: libavcodec;libavformat;libavutil;libswscale. Missing libraries: libavcodec;libavformat;libavutil;libswscale
-- Checking for module 'gstreamer-base-1.0'
-- No package 'gstreamer-base-1.0' found
-- Checking for module 'gstreamer-app-1.0'
-- No package 'gstreamer-app-1.0' found
-- Checking for module 'gstreamer-riff-1.0'
-- No package 'gstreamer-riff-1.0' found
-- Checking for module 'gstreamer-pbutils-1.0'
-- No package 'gstreamer-pbutils-1.0' found
-- Checking for module 'libdc1394-2'
-- No package 'libdc1394-2' found
-- Allocator metrics storage type: 'long long'
-- Registering hook 'INIT_MODULE_SOURCES_opencv_dnn': /home/q1/opencv/modules/dnn/cmake/hooks/INIT_MODULE_SOURCES_opencv_dnn.cmake
-- opencv_dnn: filter out cuda4dnn source code

-- General configuration for OpenCV 4.5.1-dev =====================================
-- Version control: 4.5.1-163-g3e34cec96b

-- Platform:
-- Timestamp: 2021-02-03T18:51:03Z
-- Host: Linux 4.19.0-13-amd64 x86_64
-- CMake: 3.13.4
-- CMake generator: Unix Makefiles
-- CMake build tool: /usr/bin/make
-- Configuration: RELEASE

-- CPU/HW features:
-- Baseline: SSE SSE2 SSE3
-- requested: SSE3
-- Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
-- requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
-- SSE4_1 (17 files): + SSSE3 SSE4_1
-- SSE4_2 (2 files): + SSSE3 SSE4_1 POPCNT SSE4_2
-- FP16 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
-- AVX (5 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
-- AVX2 (31 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
-- AVX512_SKX (7 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_COMMON AVX512_SKX

-- C/C++:
-- Built as dynamic libs?: YES
-- C++ standard: 11
-- C++ Compiler: /usr/bin/c++ (ver 8.3.0)
-- C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
-- C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
-- C Compiler: /usr/bin/cc
-- C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
-- C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
-- Linker flags (Release): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed
-- Linker flags (Debug): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed
-- ccache: NO
-- Precompiled headers: NO
-- Extra dependencies: dl m pthread rt
-- 3rdparty dependencies:

-- OpenCV modules:
-- To be built: calib3d core dnn features2d flann gapi highgui imgcodecs imgproc ml objdetect photo python2 python3 stitching ts video videoio
-- Disabled: world
-- Disabled by dependency: -
-- Unavailable: java
-- Applications: tests perf_tests apps
-- Documentation: NO
-- Non-free algorithms: NO

-- GUI:
-- GTK+: YES (ver 3.24.5)
-- GThread : YES (ver 2.58.3)
-- GtkGlExt: NO
-- VTK support: NO

-- Media I/O:
-- ZLib: /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11)
-- JPEG: /usr/lib/x86_64-linux-gnu/libjpeg.so (ver 62)
-- WEBP: /usr/lib/x86_64-linux-gnu/libwebp.so (ver encoder: 0x020e)
-- PNG: /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.36)
-- TIFF: /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 / 4.1.0)
-- JPEG 2000: build (ver 2.3.1)
-- OpenEXR: /usr/lib/x86_64-linux-gnu/libImath.so /usr/lib/x86_64-linux-gnu/libIlmImf.so /usr/lib/x86_64-linux-gnu/libIex.so /usr/lib/x86_64-linux-gnu/libHalf.so /usr/lib/x86_64-linux-gnu/libIlmThread.so (ver 2_2)
-- HDR: YES
-- SUNRASTER: YES
-- PXM: YES
-- PFM: YES

-- Video I/O:
-- DC1394: NO
-- FFMPEG: NO
-- avcodec: NO
-- avformat: NO
-- avutil: NO
-- swscale: NO
-- avresample: NO
-- GStreamer: NO
-- v4l/v4l2: YES (linux/videodev2.h)

-- Parallel framework: TBB (ver 2018.0 interface 10006)

-- Trace: YES (with Intel ITT)

-- Other third-party libraries:
-- Intel IPP: 2020.0.0 Gold [2020.0.0]
-- at: /home/q1/opencv/build/3rdparty/ippicv/ippicv_lnx/icv
-- Intel IPP IW: sources (2020.0.0)
-- at: /home/q1/opencv/build/3rdparty/ippicv/ippicv_lnx/iw
-- Lapack: NO
-- Eigen: YES (ver 3.3.7)
-- Custom HAL: NO
-- Protobuf: build (3.5.1)

-- OpenCL: YES (no extra features)
-- Include path: /home/q1/opencv/3rdparty/include/opencl/1.2
-- Link libraries: Dynamic load

-- Python 2:
-- Interpreter: /usr/bin/python2.7 (ver 2.7.16)
-- Libraries: /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.16)
-- numpy: /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.16.2)
-- install path: lib/python2.7/dist-packages/cv2/python-2.7

-- Python 3:
-- Interpreter: /usr/bin/python3 (ver 3.7.3)
-- Libraries: /usr/lib/x86_64-linux-gnu/libpython3.7m.so (ver 3.7.3)
-- numpy: /usr/lib/python3/dist-packages/numpy/core/include (ver 1.16.2)
-- install path: lib/python3.7/dist-packages/cv2/python-3.7

-- Python (for build): /usr/bin/python2.7

-- Java:
-- ant: NO
-- JNI: NO
-- Java wrappers: NO
-- Java tests: NO

-- Install to: /usr/local

---

[plauthor]

Now I got opencv itself working, but there is still an issue with scenedetect:

$ scenedetect -i detroit.avi detect-content list-scenes
Traceback (most recent call last):
File "/home/q1/.local/bin/scenedetect", line 6, in
from scenedetect.main import main
File "/home/q1/.local/lib/python3.7/site-packages/scenedetect/init.py", line 41, in
from scenedetect.scene_manager import SceneManager
File "/home/q1/.local/lib/python3.7/site-packages/scenedetect/scene_manager.py", line 59, in
from scenedetect.platform import tqdm
File "/home/q1/.local/lib/python3.7/site-packages/scenedetect/platform.py", line 138, in
cv2.CAP_PROP_FRAME_WIDTH = cv2.cv.CV_CAP_PROP_FRAME_WIDTH
AttributeError: module 'cv2' has no attribute 'cv'

[Breakthrough]

Hi @plauthor;

It looks like PySceneDetect isn't detecting the version of OpenCV correctly. Could you run a Python prompt again, and show me the result of:

import cv2
cv2.__version__

I think this might be an actual bug in the code, my hypothesis is that the version is "4.5.1-dev", which the code does not handle correctly. Can you confirm that this is the case? If so, I will mark this as a bug and make sure it's fixed in v0.5.6.

In the meantime, you can work around this issue by changing Line 137 in scenedetect/platform.py from:

if not opencv_version_required([3, 0]):

To:

if False:

Hope this helps, thank you!

[plauthor]

This is the configuration after compilation:

General configuration for OpenCV 4.5.1-dev =====================================
Version control: 4.5.1-163-g3e34cec96b

Platform:
Timestamp: 2021-02-03T18:51:03Z
Host: Linux 4.19.0-13-amd64 x86_64
CMake: 3.13.4
CMake generator: Unix Makefiles
CMake build tool: /usr/bin/make
Configuration: RELEASE

CPU/HW features:
Baseline: SSE SSE2 SSE3
requested: SSE3
Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
SSE4_1 (15 files): + SSSE3 SSE4_1
SSE4_2 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2
FP16 (0 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
AVX (4 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
AVX2 (29 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
AVX512_SKX (4 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_COMMON AVX512_SKX

C/C++:
Built as dynamic libs?: YES
C++ standard: 11
C++ Compiler: /usr/bin/c++ (ver 8.3.0)
C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
C Compiler: /usr/bin/cc
C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
Linker flags (Release): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed
Linker flags (Debug): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed
ccache: NO
Precompiled headers: NO
Extra dependencies: dl m pthread rt
3rdparty dependencies:

OpenCV modules:
To be built: calib3d core dnn features2d flann gapi highgui imgcodecs imgproc ml objdetect photo python2 python3 stitching ts video videoio
Disabled: world
Disabled by dependency: -
Unavailable: java
Applications: apps
Documentation: NO
Non-free algorithms: NO

GUI:
GTK+: YES (ver 3.24.5)
GThread : YES (ver 2.58.3)
GtkGlExt: NO
VTK support: NO

Media I/O:
ZLib: /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11)
JPEG: /usr/lib/x86_64-linux-gnu/libjpeg.so (ver 62)
WEBP: /usr/lib/x86_64-linux-gnu/libwebp.so (ver encoder: 0x020e)
PNG: /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.36)
TIFF: /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 / 4.1.0)
JPEG 2000: build (ver 2.3.1)
OpenEXR: /usr/lib/x86_64-linux-gnu/libImath.so /usr/lib/x86_64-linux-gnu/libIlmImf.so /usr/lib/x86_64-linux-gnu/libIex.so /usr/lib/x86_64-linux-gnu/libHalf.so /usr/lib/x86_64-linux-gnu/libIlmThread.so (ver 2_2)
HDR: YES
SUNRASTER: YES
PXM: YES
PFM: YES

Video I/O:
DC1394: YES (2.2.5)
FFMPEG: YES
avcodec: YES (58.35.100)
avformat: YES (58.20.100)
avutil: YES (56.22.100)
swscale: YES (5.3.100)
avresample: YES (4.0.0)
GStreamer: YES (1.14.4)
v4l/v4l2: YES (linux/videodev2.h)

Parallel framework: TBB (ver 2018.0 interface 10006)

Trace: YES (with Intel ITT)

Other third-party libraries:
Intel IPP: 2020.0.0 Gold [2020.0.0]
at: /home/q1/opencv/build/3rdparty/ippicv/ippicv_lnx/icv
Intel IPP IW: sources (2020.0.0)
at: /home/q1/opencv/build/3rdparty/ippicv/ippicv_lnx/iw
Lapack: NO
Eigen: YES (ver 3.3.7)
Custom HAL: NO
Protobuf: build (3.5.1)

Python 2:
Interpreter: /usr/bin/python2.7 (ver 2.7.16)
Libraries: /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.16)
numpy: /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.16.2)
install path: lib/python2.7/dist-packages/cv2/python-2.7

Python 3:
Interpreter: /usr/bin/python3 (ver 3.7.3)
Libraries: /usr/lib/x86_64-linux-gnu/libpython3.7m.so (ver 3.7.3)
numpy: /usr/lib/python3/dist-packages/numpy/core/include (ver 1.16.2)
install path: lib/python3.7/dist-packages/cv2/python-3.7

Python (for build): /usr/bin/python2.7

Java:
ant: NO
JNI: NO
Java wrappers: NO
Java tests: NO

Install to: /usr/local

[plauthor]

Your fix did help. it is working now. Thank you for your help and efforts!

[Breakthrough]

@plauthor awesome, glad everything is working now. Appreciate you providing the requested information - I've marked this as a bug, and will keep it open until it is resolved. The fix will be included in the next release of PySceneDetect.

Thank you!

[Breakthrough]

TODO: Use regex from semver.org instead of existing function.

Should avoid hard-coding behaviour on version numbers, and switch to doing feature detection.