Out = cv2.VideoWriter(name, fourcc, frameRate, (640,480)) # Define the codec and create VideoWriter object
Here is my example script which uses the corresponding fourcc (also tried hevc, h265, x265, etc.): #!/bin/python3 It works fine with other codecs like mjpg. I try to encode my webcam using OpenCV with ffmpeg backend and Python3 to an HEVC video. WORKDIR /root/opencv-$/dist-packages/cv2.Python - Encoding HEVC video using OpenCV and ffmpeg backend - python - Encoding HEVC video using OpenCV and ffmpeg backend RUN apt-get remove -y x264 ffmpeg libx264-dev & \ RUN apt-get remove -y ffmpeg x264 libx264-dev mkv (If you know how to fix this let me know in the comments).
opencv-python is already installed on this image, if you re-install opencv-python using pip, it will break.Before you use it here are some things to know:
Below is the Dockerfile for my working image. I could not find a comprehensive step-by-step solution, so I had to combine instructions from different sources. After going down the rabbit hole for a while, I realized that the solution would involve compiling some of the sources manually. Unfortunately, MP4V is not supported by most browsers, a fact I learned when I tried to embed one of these videos in a web application. Problem solved! Let’s go out for some drinks, right? Not so fast. The first solution I tried initially was to change the codec to mp4v with the following change. > video_writer = cv2.VideoWriter("movie.mp4", fourcc, 5, (5,5))Ĭould not find encoder for codec id 27: Encoder not foundįor licensing reasons , opencv-python does not ship with some of the more common video codecs. > fourcc = cv2.VideoWriter_fourcc(*"avc1") Originally I attempted the following and got the error below: > import cv2 The task I was trying to complete seemed simple enough: Use OpenCV to generate a working MP4 video by concatenating frames. This article is about a rabbit-hole I recently went down, no there will not be any Mad-Hatters or talking cats just video codecs and build flags.
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