GPUImage和AVAssetWriter将文件写入哪里？

Question

I am trying to use Brad Larson's GPUImage library to record a video file. So far, the issue I am running into is the following piece of code:

NSString *pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.m4v"];
unlink([pathToMovie UTF8String]); // If a file already exists, AVAssetWriter won't let you record new frames, so delete the old movie
NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie];
movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(480.0, 640.0)];

This is picked up directly from his example from his GitHub page https://github.com/BradLarson/GPUImage

Now, I looked at the source code and I see he does the usual AVFoundation stuff - creates AVAssetWriter instance and adds inputs to it. MY question here is that where is @"Documents/Movie.m4v" located? How can I play this video back? Or how do I even access it? I know it is located in an arbitrary location where the app bundle is copied during run-time. My goal is to be able to write the video into the Gallery or atleast an album in Gallery that is created by my app. Does anyone know where the file is being written to?

Answer 1

Maybe I'm misunderstanding, but the movie is at the path pathToMovie (or URL movieURL .

You can play it back with something like this:

#import <AVFoundation/AVFoundation.h>
#import <AVKit/AVKit.h>

// later
AVPlayerViewController *avc = [[AVPlayerViewController alloc] init];
avc.player = [[AVPlayer alloc] initWithURL:movieURL];
[myViewController presentViewController:avc animated:YES completion:nil];

If you want to download the file to your computer, you can select your connect device in Xcode > Devices, then select your app and download the package. Your movie will be in the Documents directory.

To save it to the gallery, do

// TODO: use completion arguments for a better user experience
UISaveVideoAtPathToSavedPhotosAlbum(pathToMovie,nil,nil,nil);