如何使用pyqt5从内存中读取视频数据 [英] how to read video data from memory use pyqt5

问题描述

我有一个加密的视频文件，我想将此文件解密到内存中，然后使用此数据播放视频.但是qt mediaplayer类是传入文件名的，需要有什么好办法吗?

i have an encrypted video file, i want to decrypt this file into memory and then use this data play video. but qt mediaplayer class is to pass a file name in, i need to have any good way?

这是我的代码

#!/usr/bin/env python

from PyQt5.QtCore import QFile, QFileInfo, QIODevice, QUrl, QDataStream
from PyQt5.QtWidgets import QApplication
from PyQt5.QtMultimedia import QMediaPlayer, QMediaContent
from PyQt5.QtMultimediaWidgets import QVideoWidget

if __name__ == '__main__':

import sys
app = QApplication(sys.argv)
player = QMediaPlayer()

file = QFile('mymusic.avi')
stream = QDataStream(file)
# this is where i want read form stream? how can i read from stream?
player.setMedia(QMediaContent(QUrl.fromLocalFile('mymusic.avi')))

videoWidget = QVideoWidget()
player.setVideoOutput(videoWidget)
videoWidget.show()

player.play()
sys.exit(app.exec_())

看，参数是文件名，但我想从二进制数据中读取，我该怎么做?

look, param is filename,but i want to read from a binary data,how can i do?

推荐答案

我已经解决了这个问题，解决方案如下代码

i have solved this problem, and the solutions are as follows code

#!/usr/bin/env python

from PyQt5.QtCore import QFile, QFileInfo, QIODevice, QUrl, QDataStream, QBuffer, QByteArray
from PyQt5.QtWidgets import QApplication
from PyQt5.QtMultimedia import QMediaPlayer, QMediaContent
from PyQt5.QtMultimediaWidgets import QVideoWidget

if __name__ == '__main__':

import sys
app = QApplication(sys.argv)
player = QMediaPlayer()

file = QFile('mymusic-encrypt.avi')

isOpen = file.open(QIODevice.ReadOnly)

buffer = QBuffer()
buffer.open(QIODevice.ReadWrite)

player.setMedia(QMediaContent(), buffer)

if isOpen:
    while not file.atEnd():
        temp = file.readLine()
        # temp = QByteArray.fromBase64(temp)
        buffer.write(temp)

videoWidget = QVideoWidget()
player.setVideoOutput(videoWidget)
videoWidget.show()

player.play()
sys.exit(app.exec_())

我需要仔细阅读api，谢谢大家.

i need carefully read api, thanks everyone.

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