I am using Brad Larson's great library GPUImage for my application. Currently I am stuck with an issue. My application captures 10 second videos and after that allows filter
applying. While applying filters
in GPUImageMovie
, I am not able to pause the play and apply new filter
so that video will play continuously without starting from the beginning.
I saw an open github issue here. If anyone faced similar issue and found a solution, please post your answers. Thanks in advance.
And finally I fixed this after too many searches and try. We need to initiate GPUImageMovie with AVPlayerItem instead of URL. I got this valuable clue from here.
I am posting my code which I am currently using in my application and it is working as expected. But there are performance issues in iPod 6.1 and I am working on enhancements of the same.
Initial method to setup GPUImageMovie,
- (void)setupVideo
{
playerItem = [[AVPlayerItem alloc]initWithURL:self.recordSession.outputUrl];
player = [AVPlayer playerWithPlayerItem:playerItem];
movieFile = [[GPUImageMovie alloc] initWithPlayerItem:playerItem];
movieFile.runBenchmark = YES;
movieFile.playAtActualSpeed = YES;
[self.view sendSubviewToBack:self.videoView];
[movieFile addTarget:filter];
[filter addTarget:self.videoView];
[movieFile startProcessing];
movieRunning = YES;
dispatch_async(dispatch_get_main_queue(), ^{
self.playButton.hidden = YES;
});
player.rate = 1.0;
}
This method is called when user clicks on a filter button.
- (void)filterClicked:(UIButton *)button
{
// Set paused time. If player reaches end of the video, set pausedTime to 0.
if (CMTIME_COMPARE_INLINE(pausedTime, !=, player.currentItem.asset.duration)) {
pausedTime = player.currentTime;
} else {
pausedTime = CMTimeMake(0, 600.0);
}
[self.videoView setBackgroundColor:[UIColor clearColor]];
[movieFile cancelProcessing];
switch (button.tag)
{
case 0:
filter = [[GPUImageFilter alloc] init];
break;
case 1:
filter = [[GPUImageColorInvertFilter alloc] init];
break;
case 2:
filter = [[GPUImageEmbossFilter alloc] init];
break;
case 3:
filter = [[GPUImageGrayscaleFilter alloc] init];
break;
default:
filter = [[GPUImageFilter alloc] init];
break;
}
[self filterVideo];
}
After filter generation, video play resume is handled in this method.
- (void)filterVideo {
// AVPlayerItem is initialized with required url
playerItem = [[AVPlayerItem alloc]initWithURL:self.outputUrl];
[player replaceCurrentItemWithPlayerItem:playerItem];
//GPUImageMovie is initialized with AVPlayerItem
movieFile = [[GPUImageMovie alloc] initWithPlayerItem:playerItem];
movieFile.runBenchmark = YES;
movieFile.playAtActualSpeed = YES;
// Adding targets for movieFile and filter
[movieFile addTarget:filter];
[filter addTarget:self.videoView]; // self.videoView is my GPUImageView
[movieFile startProcessing];
movieRunning = YES;
dispatch_async(dispatch_get_main_queue(), ^{
self.playButton.hidden = YES;
});
// Player rate is set to 0 means player is paused
[player setRate:0.0];
// Seeking to the point where video was paused
if (CMTIME_COMPARE_INLINE(pausedTime, !=, player.currentItem.asset.duration)) {
[player seekToTime:pausedTime];
}
[player play];
}
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