avi

Why an avi file can not be opened in OpenCV-Python

由 南楼画角 提交于 2019-12-11 08:00:07
问题 I installed OpenCV vers. 2.4.7.2 on a Windows Vista (32-bit) platform, with no reported errors. Then the following file: C:\opencv\build\python\2.7\x86\cv2.pyd was moved to: C:\python27\Lib\site-packages\ I have been testing openCV with both images and video (*.avi) files. I have no problems (yet) when working with images. However, I have found a problem when trying to open avieo files. First, an example that works fine: import cv2 path = 'D:/Videos/' video = 'julius.avi' # a test avi

OpenCV write frame to file python

由 …衆ロ難τιáo~ 提交于 2019-12-11 05:05:14
问题 Hey so im starting to play around with OpenCV and I cant get my webcam output saved to a file. Here is what I have. This runs fine, launches the webcam and creates "output.avi" The issue is output.avi is tiny(414 bytes) and the same exact bytes each time I run the program. Im guessing the issue is with the fourcc encoding but I havent been able to find what works in my case. I am running on Mac OS X. Let me know if you need anymore information. import numpy as np import cv2 path = ('/full

Matplotlib animation: setting fps=90 creates a movie file properly, but setting fps=120 does not?

由 醉酒当歌 提交于 2019-12-11 03:15:56
问题 Could you help me understand why this might be the case? This is what my command looks like: ani.save("animation.avi", codec="libx264", fps=120) The movie file size with the above command is very small in the order of hundreds of kilobytes. Playing the movie just shows a static picture (the very first frame). ani.save("animation.avi", codec="libx264", fps=90) This on the other hand, creates a movie file with a reasonable size in the order of megabytes, and plays as an animation as well. At

Directshow capture to file, nothing happens

由 时光毁灭记忆、已成空白 提交于 2019-12-10 22:19:48
问题 I am trying to follow through the DirectShow examples on the windows dev center to make my own application that can capture screen and audio to video: Capturing Video to an AVI File All code goes ok but nothing happens, the avi file is not appearing. The web cam is connected I can see stream with AMCap. In code cam is appearing with correct filename. The windows SDK is installed, my platform is win7 x64. My code: #include "stdafx.h" #include <iostream> #include <windows.h> #include <dshow.h>

Saving scatterplot animations with matplotlib

由 偶尔善良 提交于 2019-12-10 14:54:57
问题 I've been trying to save an animated scatterplot with matplotlib, and I would prefer that it didn't require totally different code for viewing as an animated figure and for saving a copy. The figure shows all the datapoints perfectly after the save completes. This code is a modified version of Giggi's on Animating 3d scatterplot in matplotlib, with a fix for the colors from Yann's answer on Matplotlib 3D scatter color lost after redraw (because colors will be important on my video, so I want

Create an .avi file from a list of bitmap images

由 久未见 提交于 2019-12-10 14:43:07
问题 I am currently trying to make a screen recorder. I made list of bitmap images and want to put them in an .avi file. Is there anyway to do that in C#? note: i'm a novice, so keep things simple 回答1: Try this site which has downloadable examples as well: A Simple C# Wrapper for the AviFile Library. 回答2: Try SharpAvi library. Its sources include a sample screen recording application. 来源： https://stackoverflow.com/questions/11802778/create-an-avi-file-from-a-list-of-bitmap-images

openCV cvCreateVideoWriter always returns null

由 ↘锁芯ラ 提交于 2019-12-10 11:40:09
问题 I am trying to save a video file with openCV under Mandriva Linux 2009.1. Unfortunately cvCreateVideoWriter always returns null although I could see and modify both and mpeg fiels, in other words cvCaptureFromCam, cvCaptureFromAvi, cvRetrieveFrame is working. I tried all the possible codecs from this tutorial and this codec page. I also tried 0 for uncompressed avi and -1 for a selection box in the fourcc parameter, but no choice has popped up and nothing happened. I also modified isColor to

Open and read avi files with OpenCV - Ubuntu

由 若如初见. 提交于 2019-12-10 10:19:18
问题 I have just read this in the book OpenCV 2 Computer Vision Application Programming Cookbook by R. Laganiere : It is important to note that in order to open the specified video file, your computer must have the corresponding codec installed, otherwise cv::VideoCapture will not be able to understand the input file. Normally, if you are able to open your video file with a video player on your machine (such as the Windows Media Player), then OpenCV should also be able to read this file.

What type of .avi video jmf plays?

由 主宰稳场 提交于 2019-12-08 12:42:23
After struggling through exceptions in using jmf, on How do I remove nullpointerexception . I am able to now play my video, but only the .mov file here at this website . But I am creating my video file using ffmpeg using images and .wav audio files. I can create it in any format, .avi , .mov , .mp4 , but what is important is I should be able to play it in my player, which I built using JMF. Currently, I am getting this error, Unable to handle format: FMP4, 1366x768, FrameRate=30.0, Length=3147264 0 extra bytes java.lang.NullPointerException at java.awt.Container.addImpl(Unknown Source) at java

What type of .avi video jmf plays?

由 此生再无相见时 提交于 2019-12-08 07:51:07
问题 After struggling through exceptions in using jmf, on How do I remove nullpointerexception. I am able to now play my video, but only the .mov file here at this website. But I am creating my video file using ffmpeg using images and .wav audio files. I can create it in any format, .avi , .mov , .mp4 , but what is important is I should be able to play it in my player, which I built using JMF. Currently, I am getting this error, Unable to handle format: FMP4, 1366x768, FrameRate=30.0, Length
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