How to add Dynamic Visual effects to running videos in iOS? - objective-c

Question

I want to change a visual effects dynamically to running videos. Am using GPUImage framework for changing the visual effects. I downloaded the sample project from Here. In this GPUImage, I choosed SimpleVideoFileFilter example. This example runs with one filter, just i modified the code and currently it supports 10 filters. My issue is, Video file is playing in GPUImageView, now i select another filter. Suddenly the video effect is also changing. But that video is starts from beginning. I want to change the filter dynamically for current playing video.
My Code is :
#pragma mark - Play Video with Effects
- (void)getVideo:(NSURL *)url
{
movieFile = [[GPUImageMovie alloc] initWithURL:url];
movieFile.runBenchmark = YES;
movieFile.playAtActualSpeed = YES;
// filter = [[GPUImagePixellateFilter alloc] init];
[movieFile addTarget:filter];
// Only rotate the video for display, leave orientation the same for recording
filterView = (GPUImageView *)self.view;
[filter addTarget:filterView];
// In addition to displaying to the screen, write out a processed version of the movie to disk
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 *movieURL1 = [NSURL fileURLWithPath:pathToMovie];
movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL1 size:CGSizeMake(640.0, 480.0)];
[filter addTarget:movieWriter];
// Configure this for video from the movie file, where we want to preserve all video frames and audio samples
movieWriter.shouldPassthroughAudio = YES;
movieFile.audioEncodingTarget = movieWriter;
[movieFile enableSynchronizedEncodingUsingMovieWriter:movieWriter];
[movieWriter startRecording];
[movieFile startProcessing];
[movieWriter setCompletionBlock:^{
[filter removeTarget:movieWriter];
[movieWriter finishRecording];
UISaveVideoAtPathToSavedPhotosAlbum(pathToMovie, nil, nil, nil);
}];
}
- (void)event:(UIButton*)sender
{
[filter removeTarget:filterView];
UIButton *selectedBtn = sender;
[movieFile removeTarget:filter];
switch (selectedBtn.tag)
{
case 0:
filter = [[GPUImageBrightnessFilter alloc] init];
break;
case 1:
filter = [[GPUImageGrayscaleFilter alloc] init];
break;
case 2:
filter = [[GPUImageSketchFilter alloc] init];
break;
case 3:
filter = [[GPUImageToonFilter alloc] init];
break;
case 4:
filter = [[GPUImageMonochromeFilter alloc] init];
break;
case 5:
filter = [[GPUImagePixellateFilter alloc] init];
break;
case 6:
filter = [[GPUImageCrosshatchFilter alloc] init];
break;
case 7:
filter = [[GPUImageVignetteFilter alloc] init];
break;
case 8:
filter = [[GPUImageColorInvertFilter alloc] init];
break;
case 9:
filter = [[GPUImageLevelsFilter alloc] init];
[(GPUImageLevelsFilter *)filter setRedMin:1.0 gamma:1.0 max:0.0 minOut:0.5 maxOut:0.5];
break;
default:
break;
}
[self getVideo:movieURL];
}
Please help me to resolve this issue.

Answer 1

I found the answer by myself. Solution is,
- (void)event:(UIButton*)sender
{
// isMoviePlayCompleted = NO;
if (btnTag != sender.tag)
{
btnTag = (int)sender.tag;
NSLog(#"tag:%d",btnTag);
[self applyFilter:sender.tag];
}
}
Applying Filter
-(void) applyFilter:(NSInteger) tag
{
[[NSFileManager defaultManager] removeItemAtURL:saveTempUrl error:nil];
recording = NO;
switch (tag)
{
case 0:
filter =nil;
filter = [[GPUImagePixellateFilter alloc] init];
[(GPUImagePixellateFilter *)filter setFractionalWidthOfAPixel:0.0];
break;
case 1:
filter =nil;
filter = [[GPUImageGrayscaleFilter alloc] init];
break;
case 2:
filter =nil;
filter = [[GPUImageSketchFilter alloc] init];
break;
case 3:
filter =nil;
filter = [[GPUImageToonFilter alloc] init];
break;
case 4:
filter =nil;
filter = [[GPUImageMonochromeFilter alloc] init];
break;
case 5:
filter =nil;
filter = [[GPUImageVignetteFilter alloc] init];
break;
default:
break;
}
[self getVideo:movieURL];
}
Play Video with Effects
- (void)getVideo:(NSURL *)url
{
[filter removeAllTargets];
movieFile.audioEncodingTarget = nil;
[movieWriter cancelRecording];
[movieFile cancelProcessing];
[movieWriter finishRecording];
movieWriter = nil;
movieFile = nil;
filterView = nil;
recording = YES;
anAsset = [[AVURLAsset alloc] initWithURL:url options:nil];
movieFile = [[GPUImageMovie alloc] initWithURL:url];
movieFile.delegate = self;
movieFile.runBenchmark = NO;
movieFile.playAtActualSpeed = YES;
[movieFile addTarget:filter];
// Only rotate the video for display, leave orientation the same for recording
filterView = (GPUImageView *)self.view;
[filter addTarget:filterView];
NSString *pathName = [NSString stringWithFormat:#"Doc.MOV"];
// In addition to displaying to the screen, write out a processed version of the movie to disk
NSString *pathToMovie = [NSTemporaryDirectory() stringByAppendingPathComponent:pathName];
NSFileManager *fileTmp = [[NSFileManager alloc] init];
if ([fileTmp fileExistsAtPath:pathToMovie]) {
[fileTmp removeItemAtPath:pathToMovie error:nil];
}
unlink([pathToMovie UTF8String]); // If a file already exists, AVAssetWriter won't let you record new frames, so delete the old movie
saveTempUrl = [NSURL fileURLWithPath:pathToMovie];
movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:saveTempUrl size:size];
[filter addTarget:movieWriter];
[movieFile enableSynchronizedEncodingUsingMovieWriter:movieWriter];
[movieWriter startRecording];
[movieFile startProcessing];
__unsafe_unretained typeof(self) weakSelf = self;
[weakSelf->movieWriter setCompletionBlock:^{
NSLog(#"write completed");
[filter removeTarget:movieWriter];
[movieWriter finishRecording];
movieWriter = nil;
movieFile = nil;
filterView = nil;
recording = NO;
if (saveFilter)
{
saveFilter = NO;
UISaveVideoAtPathToSavedPhotosAlbum([saveTempUrl path], self, #selector(video:didFinishSavingWithError:contextInfo:), nil);
shareFilter = YES;
}
}];
}
Thats it. now when i choose any filter, it witt fill newly. so memory issue is solved. now its working fine for my application.

Answer 2

// Use this code
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(movieFinished) name:MPMoviePlayerPlaybackDidFinishNotification object:videoPlayer];
[videoPlayer play];
-(void)movieFinished
{
[videoPlayer play];
}
-(void) playTheVideo:(NSURL *)videoURL
{
NSTimeInterval time= videoPlayer.currentPlaybackTime;
UIView *parentView = imageViewFiltered; // adjust as needed
CGRect bounds = parentView.bounds; // get bounds of parent view
CGRect subviewFrame = CGRectInset(bounds, 0, 0);
videoPlayer.view.frame = subviewFrame;
videoPlayer.view.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
[parentView addSubview:videoPlayer.view];
videoPlayer.contentURL = videoURL;
[videoPlayer setCurrentPlaybackTime:time];
[videoPlayer stop];
NSLog(#"Videoplayer stop or play in this view ");
[videoPlayer play];
self.showLoading = NO;
self.showLoading =NO;
}