iOS Swift上的FFMpeg(FFMpeg on iOS Swift)

iOS Swift上的FFMpeg(FFMpeg on iOS Swift)

我正在尝试通过本教程学习FFMpeg： http ：//dranger.com/ffmpeg/tutorial01.html

我希望只是将C代码翻译成swift应该能让我开始运行，但我想我错了

我尝试转换以下代码：

AVFormatContext *pFormatCtx = NULL; // Open video file if(avformat_open_input(&pFormatCtx, argv[1], NULL, 0, NULL)!=0) {}

至：

let pFormatCtx : UnsafeMutablePointer<UnsafeMutablePointer<AVFormatContext>> = nil // Open video file if avformat_open_input(pFormatCtx, path, nil, opaque) != 0 {}

此代码断开： if avformat_open_input（pFormatCtx，path，nil，opaque）！= 0 {}出现EXC_BAD_ACCESS错误

谁能猜到这里有什么不对？

顺便说一句，我有FFMpeg库编译没有问题所以我不认为我编译或导入它的方式可能存在问题。 我想可能会传递错误的参数：/任何猜测？

I'm trying to learn FFMpeg through this tutorial: http://dranger.com/ffmpeg/tutorial01.html

I was hoping that just translating the C code to swift should get me up and running but I guess I was mistaken

I tried converting the following code:

AVFormatContext *pFormatCtx = NULL; // Open video file if(avformat_open_input(&pFormatCtx, argv[1], NULL, 0, NULL)!=0) {}

to:

let pFormatCtx : UnsafeMutablePointer<UnsafeMutablePointer<AVFormatContext>> = nil // Open video file if avformat_open_input(pFormatCtx, path, nil, opaque) != 0 {}

This code breaks at: if avformat_open_input(pFormatCtx, path, nil, opaque) != 0 {} With an EXC_BAD_ACCESS error

can anyone guess whats wrong here??

By the way I have the FFMpeg library compiling without an issue so I don't think there might be an issue with the way I compiled or imported it. I'm probably passing wrong arguments I think :/ Any guesses??

最满意答案

首先，我使用Swift 2和xCode 7.2 ......

解决方案是将Context格式创建为“UnsafeMutablePointer <AVFormatContext>” ，然后通过avformat_open_input方法传递其地址。 这是适合我的代码：

var formatContext = UnsafeMutablePointer<AVFormatContext>() if avformat_open_input(&formatContext, path, nil, nil) != 0 { print("Couldn't open file") return }

希望这可以帮助。

First off I'm using Swift 2 with xCode 7.2 ...

The solution was to create the format Context as an "UnsafeMutablePointer< AVFormatContext >" and then pass its address through the avformat_open_input method. Here's the code that worked for me:

var formatContext = UnsafeMutablePointer<AVFormatContext>() if avformat_open_input(&formatContext, path, nil, nil) != 0 { print("Couldn't open file") return }

Hope this helps.