在上传到网络服务器之前如何旋转 UIImagePickerController 中的视频
使用 UIImagePickerController 选择视频后，我将视频上传到网络服务器。但是，使用横向相机拍摄的视频在服务器上是反转的。我想在上传之前使用 AVFoundation 旋转视频。我已经弄清楚如何使用 AVAsset 获取视频的大小和首选旋转。现在我需要在上传之前对视频应用仿射变换。
以下是 LandscapeRight 视频的大小和变换示例：
2011-01-07 20:07:30.024 MySecretApp[1442:307] size.width = 1280.000000 size.height = 720.000000 2011-01-07 20:07:30.027 MySecretApp[1442:307] txf.a = -1.000000 txf.b = 0.000000 txf.c = 0.000000 txf.d = -1.000000 txf.tx = 1280.000000 txf.ty = 720.000000
如何我转换视频以撤消反转？我假设我必须将结果导出到一个新文件并将其上传到网络服务器。我还必须对纵向拍摄的视频进行类似的转换，以将它们从横向旋转，以便它们在服务器上正确定位。
谢谢
I'm uploading videos to a web server after choosing the video using the UIImagePickerController. However, videos shot with the camera in landscapeRight orientation are inverted on the server. I want to use AVFoundation to rotate the video before uploading. I've figured out how to get the size and preferredRotation of the video using AVAsset. Now I need to apply an affine transform to the video before uploading.
Here's an example of the size and transform from a landscapeRight video:
2011-01-07 20:07:30.024 MySecretApp[1442:307] size.width = 1280.000000 size.height = 720.000000 2011-01-07 20:07:30.027 MySecretApp[1442:307] txf.a = -1.000000 txf.b = 0.000000 txf.c = 0.000000 txf.d = -1.000000 txf.tx = 1280.000000 txf.ty = 720.000000
How would I transform the video to undo the inversion? I assume that I'd have to export the results to a new file and upload that to the webserver. I'll also have to do a similar conversion to videos shot in portrait to rotate them from landscape so that they are orientated correctly on the server.
Thanks
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使用 ffmpeg 怎么样，它可以作为库链接到您的 iPhone 应用程序中？
这是一个重复的问题，其中详细介绍了 ffmpeg 解决方案。
How about using ffmpeg, which can be included as a library linked into your iPhone app?
Here's a duplicate question with the ffmpeg solution detailed.