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fix(cv): restore FFmpeg-enabled OpenCV so RTSP camera capture works #41

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Merged
rwlove merged 1 commit into from
Jun 12, 2026
Merged

fix(cv): restore FFmpeg-enabled OpenCV so RTSP camera capture works #41

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11 changes: 11 additions & 0 deletions cv/Dockerfile.base
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,17 @@ RUN --mount=type=cache,target=/root/.cache/pip \
&& pip install -r /tmp/req.txt \
&& rm /tmp/req.txt

# The nvcr.io base ships its own OpenCV (pip package name `opencv`, built
# WITHOUT FFmpeg) which shadows the opencv-python wheel from req.txt — the
# imported cv2 ends up FFMPEG: NO, so cv2.VideoCapture can't open RTSP and
# every camera open fails instantly. Drop the base build and force-reinstall
# the pip wheel (FFMPEG: YES), then assert the backend is present so this
# regression cannot return silently in a future base bump.
RUN --mount=type=cache,target=/root/.cache/pip \
pip uninstall -y opencv opencv-python opencv-python-headless || true \
&& pip install --force-reinstall --no-deps "opencv-python>=4.10" \
&& python3 -c "import cv2; bi=cv2.getBuildInformation(); assert any('FFMPEG' in l and l.strip().endswith('YES') for l in bi.splitlines()), 'OpenCV FFMPEG backend missing — RTSP capture would fail'; print('cv2', cv2.__version__, 'FFMPEG: YES')"

# Diagnostic: print the compiled arch list so a future regression is
# visible in build logs. With the nvcr.io base on 25.04, expect sm_70
# through sm_120 (Volta through Blackwell). Pascal (sm_61) is not
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