We need CMake to configure the installation, GCC for compilation, Python-devel and Numpy for building Python bindings etc. You can skip optional dependencies if you don't want. Building OpenCV from sourceĬompiling from source may seem a little complicated at first, but once you succeeded in it, there is nothing complicated.įirst we will install some dependencies. Also at some point in time, if you want to contribute to OpenCV, you will need this. So for getting latest source codes preference is next method, i.e. With respect to Python API, latest version will always contain much better support and latest bug fixes. For example, at the time of writing this tutorial, apt repository contains 2.4.8 while latest OpenCV version is 3.x. Apt repositories may not contain the latest version of OpenCV always. G += plot(x/2, xr, color="green", legend_label="x/2")Ī = animate(frames, ymin=0.0, ymax=1.0, legend_loc=(0.2,0.If the results are printed out without any errors, congratulations !!! You have installed OpenCV-Python successfully. Saving an animation toĪ movie file in any format other than GIF requires this software, soįor reference, here is the code that gives the error: n = var("n") However when trying to import a video file via ffmpeg I get this: import numpy. OSError: Error: ffmpeg does not appear to be installed. conda activate pip install picamera Note, this installs. Error in lines 9-9įile "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 1188, in executeįlags=compile_flags) in namespace, localsįile "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 2944, in showįile "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 2903, in show0įile "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 2868, in show0įile "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 2642, in show_animationįile "/usr/local/sage/local/lib/python2.7/site-packages/sage/plot/animate.py", line 885, in ffmpeg
Everything seems to be working but I am trying to debug why sage -pip install -user ffmpeg did not make the " OSError: Error: ffmpeg does not appear to be installed." message go away, even though it said it had been installed. I am running a Docker instance of Cocalc on a Ubuntu 16 server.
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