empty video.gif (open Could not find encoder for codec_id=27, error: Encoder not found)

[Olivier ARCHER]

ubuntu 23.04

When launching the test from a test.py file as

#!/bin/env python
from animated_drawings import render
render.start('./examples/config/mvc/different_bvh_skeleton_example.yaml')

The output file video.gif is almost empty (blank file).

when launching pytest tests/test_render.py:

================================================================================== test session starts ==================================================================================
platform linux -- Python 3.8.13, pytest-7.4.2, pluggy-1.3.0
rootdir: /home/oarcher/Develop/tensor_rc/AnimatedDrawings
collected 2 items                                                                                                                                                                       

test_render.py .F                                                                                                                                                                 [100%]

======================================================================================= FAILURES ========================================================================================
____________________________________________________________________________________ test_render_mp4 ____________________________________________________________________________________

    @pytest.mark.skipif(os.environ.get('IS_CI_RUNNER') == 'True', reason='skipping video rendering for CI/CD')
    def test_render_mp4():
        render_mp4_cfg_fn = resource_filename(__name__, 'test_render_files/mvc_render_mp4.yaml')
    
        render.start(render_mp4_cfg_fn)
    
>       assert os.path.exists('.tests/test_render_files/video.mp4')
E       AssertionError: assert False
E        +  where False = <function exists at 0x7f7e66dbb1f0>('.tests/test_render_files/video.mp4')
E        +    where <function exists at 0x7f7e66dbb1f0> = <module 'posixpath' from '/xxx/anaconda3/envs/animated_drawings/lib/python3.8/posixpath.py'>.exists
E        +      where <module 'posixpath' from '/xxx/anaconda3/envs/animated_drawings/lib/python3.8/posixpath.py'> = os.path

test_render.py:29: AssertionError
--------------------------------------------------------------------------------- Captured stdout call ----------------------------------------------------------------------------------
 Writing video to: /xxx/AnimatedDrawings/tests/.tests/test_render_files/video.mp4
--------------------------------------------------------------------------------- Captured stderr call ----------------------------------------------------------------------------------
[ERROR:0@16.162] global /io/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp (2927) open Could not find encoder for codec_id=27, error: Encoder not found
[ERROR:0@16.162] global /io/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp (3002) open VIDEOIO/FFMPEG: Failed to initialize VideoWriter

[Olivier ARCHER]

I've solved this issue by uninstalling opencv with pip, and reinstalling with conda:

pip uninstall opencv-python opencv-contrib-python
conda install -c conda-forge opencv

For a fresh install, I think that conda create --name animated_drawings python=3.8.13 from the readme can be replaced with conda create --name animated_drawings python=3.8.13 opencv

I close the issue (I've opened it just for reference). I don't know if this problem occur on other platform and if the readme should be updated.

[daocode]

change export_mp4_example.yaml OUTPUT_VIDEO_CODEC from avc1 to mp4v