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gstreamer-python's Issues

OSError: dlopen(libgstreamer-1.0.so.0, 6): image not found

gst_hack.py was throwing this error, when running on a mac:

---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
~/Documents/mythic-projects/OKR_2019Q2/gstreamer_tutorials/test_gst_pipeline.py in <module>
      6 import os
      7 import logging
----> 8 from pygst_utils import utils
      9 logging.basicConfig(level=logging.DEBUG)
     10

~/Documents/mythic-projects/OKR_2019Q2/venv/lib/python3.6/site-packages/pygst_utils/__init__.py in <module>
      4 from gi.repository import Gst, GstBase, GObject, GLib
      5
----> 6 from .gst_hacks import map_gst_buffer, get_buffer_size
      7 from .gst_hacks import map_gst_memory
      8

~/Documents/mythic-projects/OKR_2019Q2/venv/lib/python3.6/site-packages/pygst_utils/gst_hacks.py in <module>
     25 _GST_MAP_INFO_POINTER = POINTER(_GstMapInfo)
     26
---> 27 _libgst = CDLL("libgstreamer-1.0.so.0")
     28 _libgst.gst_buffer_map.argtypes = [c_void_p, _GST_MAP_INFO_POINTER, c_int]
     29 _libgst.gst_buffer_map.restype = c_int

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ctypes/__init__.py in __init__(self, name, mode, handle, use_errno, use_last_error)
    346
    347         if handle is None:
--> 348             self._handle = _dlopen(self._name, mode)
    349         else:
    350             self._handle = handle

OSError: dlopen(libgstreamer-1.0.so.0, 6): image not found

I was able to get around it by setting https://github.com/jackersson/pygst-utils/blob/master/pygst_utils/gst_hacks.py#L27 to the .dylib path

for my machine, it was this:

libgst = CDLL("/usr/local/lib/libgstreamer-1.0.dylib")

Writable array requested but buffer is not writeable

I am trying to draw some shapes on the video stream using PyCairo:

with map_gst_buffer(buffer, Gst.MapFlags.READ | Gst.MapFlags.WRITE) as mapped:
     # code to draw shapes

However I get an error:

Writable array requested but buffer is not writeable

This error is raised in the map_gst_buffer function in gst_hacks.py

    if flags & Gst.MapFlags.WRITE and _libgst.gst_mini_object_is_writable(ptr) == 0:
        raise ValueError(
            "Writable array requested but buffer is not writeable")

What am I missing here?

Readme question

Readme includes sections “install OS packages”, “in-place”, “pip-package” under the section Install. Are all 3 of those steps needed to use the pip package?

Internal streaming error during appsrc example

Hey,

thanks for this great work. I want to use it in an app to push frames to a pipeline after some computer vision magic. However, when running the appsrc example, I encounter the following error:

bob@nano5:~/gstreamer-python$ PYTHONPATH=. python examples/run_appsrc.py -p "appsrc emit-signals=True is-live=True caps=video/x-raw,format=RGB,width=640,height=480 ! queue ! videoconvert ! autovideosink"  -n 1000

INFO   | pygst.GstPipeline    | 13.08 12:22:31.595 | MainThread | GstPipeline 
 gst-launch-1.0 appsrc emit-signals=True is-live=True caps=video/x-raw,format=RGB,width=640,height=480 ! queue ! videoconvert ! autovideosink

INFO   | pygst.GstPipeline    | 13.08 12:22:31.672 | MainThread | Starting GstPipeline

DEBUG  | pygst.GstPipeline    | 13.08 12:22:31.674 | MainThread | GstPipeline Setting pipeline state to PLAYING ... 

DEBUG  | pygst.GstPipeline    | 13.08 12:22:31.675 | MainThread | GstPipeline Pipeline state set to PLAYING 

ERROR  | pygst.GstPipeline    | 13.08 12:22:31.695 | Thread-1 | Gstreamer.GstPipeline: Error gst-stream-error-quark: 
Internal data stream error. (1): gstbasesrc.c(3055): gst_base_src_loop (): /GstPipeline:pipeline0/GstAppSrc:appsrc0:
streaming stopped, reason not-negotiated (-4). 

DEBUG  | pygst.GstPipeline    | 13.08 12:22:31.696 | Thread-1 | GstPipeline Stopping pipeline ...

DEBUG  | pygst.GstPipeline    | 13.08 12:22:31.697 | Thread-1 | GstPipeline Reseting pipeline state ....

DEBUG  | pygst.GstPipeline    | 13.08 12:22:31.698 | Thread-1 | GstPipeline Gst.Pipeline successfully destroyed

INFO   | pygst.GstPipeline    | 13.08 12:22:38.935 | MainThread | GstPipeline Shutdown requested ...

INFO   | pygst.GstPipeline    | 13.08 12:22:38.935 | MainThread | GstPipeline successfully destroyed

DEBUG  | pygst.GstContext     | 13.08 12:22:38.935 | MainThread | GstContext Quitting main loop ...

DEBUG  | pygst.GstContext     | 13.08 12:22:38.937 | MainThread | GstContext Joining main loop thread...

platform: Jetson nano with jetpack 4.5.1
python: 3.6.9
gstreamer: 1.14.5

Any idea what might be the reason?
Cheers

[Question] Change the buffer size

As per README, you can modify the buffer as

with map_gst_buffer(buffer, Gst.MapFlags.READ | Gst.MapFlags.WRITE) as mapped:

My question is: what if I want to increase the buffer size by appending some bytes from Python?
Is it possible? If so, how to convert Python bytearray to C byte array, using Ctypes?

Thanks.

Best Regards,

PYGOBJECT version mismatch

Was following the README.md file and got this error when running the "build-gst-python.sh" script:

checking for GST... yes
checking for PYGOBJECT... configure: error: Package requirements (pygobject-3.0 >= 3.8) were not met:

No package 'pygobject-3.0' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables PYGOBJECT_CFLAGS
and PYGOBJECT_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

make: *** No targets specified and no makefile found. Stop.
make: Nothing to be done for 'install'.

Any tips on how to fix this?

Metadata class_name field overwritten

Using the gst_objects_info_meta library and Python bindings, it seems that the class_name field is getting overwritten/corrupted. For instance, I've got detector and annotator elements, where the former is generating the bounding boxes, and the latter is drawing them on the frame. Printing things out while the pipeline runs, I get something like b'\x01' as the class label. I assume this has something to do with memory not being allocated correctly for that field but am not sure how to fix it.

Build fails, legacy-install-failure

I may be using too recent of dependencies. Using Python 3.8 on Ubuntu 20.

Attempted the following command: pip install . -v --install-option "build_py" --install-option "--skip-gst-python"

Resulted in the following:

  × Running setup.py install for toml did not run successfully.
  │ exit code: 1
  ╰─> See above for output.
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  full command: /usr/bin/python3 -u -c '
  exec(compile('"'"''"'"''"'"'
  # This is <pip-setuptools-caller> -- a caller that pip uses to run setup.py
  #
  # - It imports setuptools before invoking setup.py, to enable projects that directly
  #   import from `distutils.core` to work with newer packaging standards.
  # - It provides a clear error message when setuptools is not installed.
  # - It sets `sys.argv[0]` to the underlying `setup.py`, when invoking `setup.py` so
  #   setuptools doesn'"'"'t think the script is `-c`. This avoids the following warning:
  #     manifest_maker: standard file '"'"'-c'"'"' not found".
  # - It generates a shim setup.py, for handling setup.cfg-only projects.
  import os, sys, tokenize
  
  try:
      import setuptools
  except ImportError as error:
      print(
          "ERROR: Can not execute `setup.py` since setuptools is not available in "
          "the build environment.",
          file=sys.stderr,
      )
      sys.exit(1)
  
  __file__ = %r
  sys.argv[0] = __file__
  
  if os.path.exists(__file__):
      filename = __file__
      with tokenize.open(__file__) as f:
          setup_py_code = f.read()
  else:
      filename = "<auto-generated setuptools caller>"
      setup_py_code = "from setuptools import setup; setup()"
  
  exec(compile(setup_py_code, filename, "exec"))
  '"'"''"'"''"'"' % ('"'"'/tmp/pip-install-oy1_0t_m/toml_ea05c2edf01f452b96ccba24abf9cd53/setup.py'"'"',), "<pip-setuptools-caller>", "exec"))' install --record /tmp/pip-record-xphty8gv/install-record.txt --single-version-externally-managed --user --prefix= --compile --install-headers /home/colin/.local/include/python3.8/toml build_py --skip-gst-python
  cwd: /tmp/pip-install-oy1_0t_m/toml_ea05c2edf01f452b96ccba24abf9cd53/
  Running setup.py install for toml ... error
error: legacy-install-failure

× Encountered error while trying to install package.
╰─> toml

note: This is an issue with the package mentioned above, not pip.
hint: See above for output from the failure.

GStreamer seems to have moved from autogen to meson...

.... which breaks this script. I'll see if I can get it working 'by hand' and make a pull request if I get it working.

Installing in Dockerfile breaks Deepstream installation

I am installing this package using pip within a Dockerfile build:
RUN pip3 install git+https://github.com/jackersson/gstreamer-python.git#egg=gstreamer-python
The base image I am using is the Deepstream image nvcr.io/nvidia/deepstream:6.0.1-devel. If I do this, when I run the container, Deepstream plugins can't be found anymore (e.g. get-inspect-1.0 nvinfer can't find nvinfer). However, if I install this very library (in the same way) within the container (vs during the docker build) I have no issues and everything works fine: Deepstream plugins can be found.
Any hint on what could be causing this issue?

Recommended way to handle KeyboardInterrupt (ctrl-c) properly in apps

(sorry this may not be an issue but a question)

I have made a test Python app that use the GstContext. As GstContext runs inside a thread and I could not find a way to "terminate" it properly. The main thread could not catch the KeyboardInterrupt (even I have tried the signal).

Is there a way to handle KeyboardInterrupt at the main thread (app) and shutdown pipeline gracefully?

Thanks.

gstreamer-python/gstreamer/gst_tools.py

Line 98 in 7773164

except Exception:

dynamically adding a pipline

Hi,

I'm trying to understand how to dynamically add a pipeline to existing one. I see in

gstreamer-python/examples/pipeline_with_factory.py

Line 40 in c8d4e04

src = Gst.ElementFactory.make("videotestsrc", "my_video_test_src")

the usage of factory.

https://github.com/GStreamer/gst-python/blob/2b5b0d951ed997462c5e1d0ec9f70cabe023058a/examples/dynamic_src.py#L63

is an example of a dynamic factory. Is there an easy way to apply GstPipeline to a dynamic allocated instance?

Kind regards,

Martijn

Install option --skip-gst-python fails

I just tried to install gstreamer-python while skipping gst-python and installation failed.

Error logs:

gstreamer-python-install-error.txt

Steps to reproduce:

git clone git+https://github.com/jackersson/gstreamer-python.git
cd gstreamer-python
pip3 --user install . -v --install-option "build_py" --install-option "--skip-gst-python"

I would be grateful for any pointers to fix this!

Project license

This is a very good Python module/utility classes on top of the low-level module "py-gst".
It seems that this repo does not have any license defined.

libgst_objects_info_meta.so: cannot open shared object file: No such file or directory

After executed the installation part, I tried to import from pygst_utils.gst_objects_info_meta import gst_meta_write and got an error:

>>> from pygst_utils.gst_objects_info_meta import gst_meta_write
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/dist-packages/pygst_utils/gst_objects_info_meta.py", line 27, in <module>
    libc = CDLL(os.path.join(cwd, "3rd_party/gstreamer/build/libgst_objects_info_meta.so"))
  File "/usr/lib/python3.6/ctypes/__init__.py", line 348, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: /usr/local/lib/python3.6/dist-packages/pygst_utils/3rd_party/gstreamer/build/libgst_objects_info_meta.so: cannot open shared object file: No such file or directory

Any ideas on how to solve it?

run_rtsp example throw: TypeError: 'Iterator' object is not iterable

Throw an Error TypeError: 'Iterator' object is not iterable in example run_rtsp.py.

gstreamer-python/examples/run_rtsp.py

Line 162 in c8d4e04

return [e for e in element.iterate_elements() if isinstance(e, cls)]

Log:

Traceback (most recent call last):
  File "rtsp-server.py", line 212, in do_configure
    appsrcs = get_child_by_cls(rtsp_media.get_element(), GstApp.AppSrc)
  File "rtsp-server.py", line 162, in get_child_by_cls
    return [e for e in element.iterate_elements() if isinstance(e, cls)]
TypeError: 'Iterator' object is not iterable