如何用音频保存 GPUImage 过滤后的视频？

Question

我已经对视频应用了滤镜。但是将它保存在带有音频输出的相机胶卷中的问题。但不幸的是我没有保存它。

见下面的代码。

-(IBAction)saveVideo:(id)sender{

    NSString *pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.mov"];
    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(720.0, 1280.0)];
    _movieWriter.shouldPassthroughAudio = YES;
    //_movieWriter.assetWriter.movieFragmentInterval = kCMTimeInvalid;
    _movieWriter.hasAudioTrack = YES;
    _movieFile.audioEncodingTarget = self.movieWriter;
    [_filter addTarget:_movieWriter];
    [_movieFile enableSynchronizedEncodingUsingMovieWriter:_movieWriter];

    [_movieWriter startRecording];
    __block GPUImageOutput<GPUImageInput> *weekfilter = _filter;
    __block GPUImageMovieWriter *weekMovieWriter = _movieWriter;
    ViewControllerFilters* __weak weakSelf = self;

    [_movieWriter setCompletionBlock:^{
        [weekfilter removeTarget:weekMovieWriter];
        [weekMovieWriter finishRecording];

        dispatch_async(dispatch_get_main_queue(), ^{
            // [timer invalidate];
            //self.progressLabel.text = @"100%";
//            [[SoundManager sharedManager] stopAnimating];
//            [weakSelf performSegueWithIdentifier:export sender:movieURL];
            [weakSelf saveToCameraRoll:movieURL];
        });
    }];
}

我得到日志无法写入框架。并收到内存警告和应用程序崩溃。

Answer 1

确保 moviefile 声明为强。

-(void)saveVideo{
    NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:self.url options:nil];
    AVAssetTrack *videoAssetTrack = [[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
    //CGAffineTransform videoTransform = CGAffineTransformMakeRotation(self.ValueOrientation);

    self.movieFile1 = [[GPUImageMovie alloc] initWithURL:self.url];
    self.movieFile1.runBenchmark = YES;
    self.filterExport = self.filterobject;
    [self.movieFile1 addTarget:self.filterExport];

    [self.filterExport removeAllTargets];

    NSString* filteredFile= [documentsDirectory stringByAppendingPathComponent:@"MovieFiltered.m4v"];
    unlink([filteredFile UTF8String]);
    NSURL *movieURL = [NSURL fileURLWithPath:filteredFile];

    self.movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(videoAssetTrack.naturalSize.width, videoAssetTrack.naturalSize.height)];
    [self.filterExport addTarget:self.movieWriter];

    self.movieWriter.shouldPassthroughAudio = YES;
    self.movieFile1.audioEncodingTarget = self.movieWriter;
    [self.movieFile1 enableSynchronizedEncodingUsingMovieWriter:self.movieWriter];
     [self.movieWriter startRecording];
    [self.movieFile1 startProcessing];

    __weak typeof(self) weakSelf = self;

    [self.movieWriter setCompletionBlock:^{
        NSLog(@"Recording done");
        [weakSelf.movieWriter finishRecording];
       // [weakSelf writeToAlbum:movieURL];
    }];
}

如何用音频保存 GPUImage 过滤后的视频？

How to save GPUImage filtered video with Audio?

ios

objective-c

iphone

ios9

gpuimage