在OpenCV python中打开具有未知扩展名的文件(Mjpeg?)

时间:2013-11-12 16:39:44

标签: python opencv ffmpeg

我正在尝试使用python将第三方视频文件打开到OpenCV中。 我的相机(plotwatcher相机陷阱)以愚蠢的专有格式拍摄。扩展名是唯一的(.tlv),但我可以在VLC中播放文件,使用ffmpeg我可以看到以下编码:

C:\Users\Ben>ffmpeg -i C:/Users/Ben/Documents/OpenCV_HummingbirdsMotion/PlotwatcherTest.tlv

ffmpeg version N-58037-g355cea8 Copyright (c) 2000-2013 the FFmpeg developers
built on Nov 11 2013 18:01:42 with gcc 4.8.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil      52. 52.100 / 52. 52.100
libavcodec     55. 41.100 / 55. 41.100
libavformat    55. 21.100 / 55. 21.100
libavdevice    55.  5.100 / 55.  5.100
libavfilter     3. 90.102 /  3. 90.102
libswscale      2.  5.101 /  2.  5.101
libswresample   0. 17.104 /  0. 17.104
libpostproc    52.  3.100 / 52.  3.100
Input #0, avi, from 'C:/Users/Ben/Documents/OpenCV_HummingbirdsMotion/Plotwatche
rTest.tlv':
Duration: 00:00:05.00, start: 0.000000, bitrate: 14608 kb/s
Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj420p(pc), 1280x720, 10 tb
r, 10 tbn, 10 tbc

从此我可以看到文件被编码为mjpeg格式。

如何在open cv中打开此文件?

import cv2
#import cv2.cv as cv
import numpy as np
cap = cv2.VideoCapture("C:/Users/Ben/Documents/OpenCV_HummingbirdsMotion/PlotwatcherTest.mjpg")
ret, frame = cap.read()
#show first image
cv2.imshow('my window',frame)
cv2.waitKey(0)
cv2.destroyWindow('my window')

我可以看到没有加载任何内容。当我尝试查看第一帧时,我收到错误:

File "C:\Users\Ben\Documents\OpenCV_HummingbirdsMotion\Test.py", line 21, in <module>
cv2.imshow('my window',frame)
error: ..\..\..\..\opencv\modules\highgui\src\window.cpp:261: error: (-215)
size.width>0        && size.height>0

我已经尝试将原生的.tlv,mjpeg和mjpg以及.MJPG结尾留在这里找到的概念性想法:MJPEG stream fails to open in OpenCV 2.4

我感谢所有人的帮助!

1 个答案:

答案 0 :(得分:0)

我无法手动使用此功能。我卸载了所有东西,然后我安装了内置open_cv的anaconda,然后通过环境设置连接ffmpeg路径,它工作正常!