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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm working on a video encoding application which I want to prevent from stopping when the hosting Activity enters the background, or the screen cycles off/on. The architecture of my encoder is derived from the excellent CameraToMpegTest example, with the addition of displaying camera frames to a GLSurfaceView (see Github links below). I'm currently performing background recording with a two-state solution: When the hosting Activity is in the foreground, encode one video frame on each call to the GLSurfaceView.Renderer 's onDrawFrame . This

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to get the following MediaExtractor example to work: http://bigflake.com/mediacodec/ - ExtractMpegFramesTest.java (requires 4.1, API 16) The problem I have is that outputSurface.awaitNewImage(); seems to always throw RuntimeException("frame wait timed out"), which is thrown whenever the mFrameSyncObject.wait(TIMEOUT_MS) call times out. No matter what I set TIMEOUT_MS to be, onFrameAvailable() always gets called right after the timeout occurs. I tried with 50ms and with 30000ms and it's the same. It seems like the onFrameAvailable(

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: When plotting a plane in Matplotlib, I do not get a solid color. I get the following with many shades of red: I am using Matplotlib version 1.5.1 in Python 3.5.2. The code that I'm running is below: import numpy as np from mpl_toolkits.mplot3d import axes3d import matplotlib.pyplot as plt fig = plt.figure() ax = fig.add_subplot(111, projection='3d') xaxis = np.linspace(-3, 3, 201) yaxis = np.linspace(-3, 3, 201) X, Y = np.meshgrid(xaxis, yaxis) Z = 8 - 3*X - 3*Y ax.plot_surface(X,Y,Z,color='r') plt.savefig('not_red.png') 回答1: If you do not

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm working on a Android app that uses MediaCodec to encode H.264 video using the Surface method. I am targeting Android 5.0 and I've followed all the examples and samples from bigflake.com (I started working on this project two years ago, so I kind of went through all the gotchas and other issues). All is working nice and well on Nexus 6 (which uses the Qualcomm hardware encoder for doing this), and I'm able to record flawlessly in real-time 1440p video with AAC audio, in a multitude of outputs (from MP4 local files, upto http streaming).

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to capture image data from the camera using the camera2 API. I've mostly used code taken from the android Capture2RAW example. Only a few images come through (i.e. calls to onImageAvailable) before stopping completely. I've tried capturing using the RAW_SENSOR and JPEG formats at different sizes with the same results. What am I doing wrong? this.mImageReader = ImageReader.newInstance(width, height, ImageFormat.RAW_SENSOR, /*maxImages*/ 1); Surface surface = this.mImageReader.getSurface(); final List<Surface> surfaces = Arrays

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I was trying to calculate the curvature of a surface given by array of points (x,y,z). Initially I was trying to fit a polynomial equation z=a + bx + cx^2 + dy + exy + fy^2) and then calculate the gaussian curvature $ K = \frac{F_{xx}\cdot F_{yy}-{F_{xy}}^2}{(1+{F_x}^2+{F_y}^2)^2} $ However the problem is fitting if the surface is complex. I found this Matlab code to numerically calculate curvature. I wonder how to do the same in Python. function [K,H,Pmax,Pmin] = surfature(X,Y,Z), % SURFATURE - COMPUTE GAUSSIAN AND MEAN CURVATURES OF A

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a list of 3-tuples representing a set of points in 3D space. I want to plot a surface that covers all these points. The plot_surface function in the mplot3d package requires as arguments X,Y and Z which are 2d arrays. Is plot_surface the right function to plot surface and how do I transform my data in to the required format ? data = [(x1,y1,z1),(x2,y2,z2),.....,(xn,yn,zn)] 回答1: For surfaces it's a bit different than a list of 3-tuples, you should pass in a grid for the domain in 2d arrays. If all you have is a list of 3d points,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I've been working on making my custom camera activity on Android, but when rotating the camera, the aspect ratio of the surface view gets messed up. In my oncreate for the activity, I set the framelayout which holds the surface view that displays the camera's parameters. //FrameLayout that will hold the camera preview FrameLayout previewHolder = (FrameLayout) findViewById(R.id.camerapreview); //Setting camera's preview size to the best preview size Size optimalSize = null; camera = getCameraInstance(); double aspectRatio = 0; if(camera !=

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: This boggles me. DirectX bypasses everything and talks directly to the device driver, thus GDI and other usual methods won't work - unless Aero is disabled (or unavailable), all that appears is a black rectangle at the top left of the screen. I have tried what other have suggested on several forums, using DirectX to get the back buffer and save it, but I get the same result: device->GetFrontBufferData(0, surface); D3DXSaveSurfaceToFile("fileName", D3DXIFF_BMP, surface, NULL, NULL); Is there any way to get a screenshot of another

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: imagine I have a 3 columns matrix x, y, z where z is a function of x and y. I know how to plot a "scatter plot" of these points with plot3d(x,y,z) But if I want a surface instead I must use other commands such as surface3d The problem is that it doesn't accept the same inputs as plot3d it seems to need a matrix with How can I get this matrix? I've tried with the command interp, as I do when I need to use contour plots. How can I plot a surface directly from x,y,z without calculating this matrix? If I had too many points this matrix would be