in my app i want to add feature . swipe on video take the video to next 2 sec from current playback time. but my player not doing this accurate and exact according to time which i pass to function it jump the current play back time at any where else. i already search a lot and found may be this is due to key-frame of my video i think i need to increase key-frame of video if yes
then (1) what is the best way to increase key-frame of video?
if this issue can solve without increasing key-frame then
(2) how can i do this ?
here is my code
-(void) handleOneFingerSwipeRight
{
if(labelTimer.isValid)
[labelTimer invalidate];
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:#selector(signleTap) object:nil];
[videoPlayer pause];
double d = 0;
d = floor([videoPlayer currentPlaybackTime]);
d = d+2.0;
NSLog(#"current time %f",floor([videoPlayer currentPlaybackTime]));
NSLog(#"new time %f",d);
[videoPlayer setCurrentPlaybackTime:d];
[videoPlayer play];
[self setLable:[NSString stringWithFormat:#"Adaptive Forward %f",d]];
}
Related
I want to make part of video slow down while rest of it are normal speed, just like the slow mode video taken by iOS camera. How to do that? I've search AVFoundation but found nothing.
Thanks!
If you are only talking about creating this effect during playback (and not exporting it), you should be able to do so by just changing the rate property of AVPlayer at specific times. Use addBoundaryTimeObserverForTimes:queue:usingBlock: to get notified when it's time to change the rate.
CMTime interval = CMTimeMake(10, 1);
NSArray *times = #[[NSValue valueWithCMTime:interval]];
_boundaryTimeObserver = [_avPlayer addBoundaryTimeObserverForTimes:times
queue:nil
usingBlock:^{
[_weakPlayer setRate:0.5];
}];
The rate property works as follows:
rate = 0.0; // Stopped
rate = 0.5; // Half speed
rate = 1.0; // Normal speed
For slow motion playback, the AVPlayer property canPlaySlowForward must be set to true.
Remember to remove the time observer when you're finished with it, and make sure to use an unretained reference to self or to the player within the block in order to avoid retain cycles.
I'm making an app that uses AVPlayer. In one of my views I have a UISlider with which the user should be able to scrub forward and backward. I'm having some trouble getting seekToTime to work as I want. When I try to change time the playback starts from 0, and I'm not sure how to solve this. My current implementation looks like this:
[self.progressSlider addTarget:self action:#selector(sliderValueChanged) forControlEvents:UIControlEventValueChanged];
[self.progressSlider addTarget:self action:#selector(sliderReleased) forControlEvents:UIControlEventTouchUpInside];
- (void)sliderValueChanged {
[...]
[player pause];
}
- (void)sliderReleased {
float timeInSecond = self.progressSlider.value;
timeInSecond *= 1000;
// I have trie to hard code this value, but I get the same result.
CMTime cmTime = CMTimeMake(timeInSecond, NSEC_PER_SEC);
[player.currentItem seekToTime:cmTime toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero completionHandler:^(BOOL finished) {
if (finished) {
[player play];
}
}];
}
Any ideas on what I'm doing wrong?
Can mention that I stream audio using AVPlayer's: playerItemWithURL if that makes any difference.
One problem is that NSEC_PER_SEC is 1,000,000,000, so CMTimeMake(timeInSecond, NSEC_PER_SEC) is going to be a really tiny number (unless timeInSecond is ridiculously huge) - in fact, it will be arbitrarily close to zero, which is exactly what you are experiencing.
Just to be clear: CMTimeMake defines a rational number. You are giving a numerator and a denominator. If your denominator is huge, the rational number will be tiny.
I have an image animation with total duration of 2 seconds and in total 6 images. It's a blinking button. I want to play a sound every time that button blink, so in interval of 0.66 seconds by 3 times. I tried do this but the last sound play its a microsecond delay that i dont want..What i can do to play the sound right?
I'm doing this:
-(void)playAnswerAnimSound
{
if(audioActive)
{
if(answerAnimCounter <3)
{
//AudioServicesDisposeSystemSoundID(answerAnimSound);
AudioServicesPlaySystemSound(answerAnimSound);
[answerAnimTimer invalidate];
answerAnimTimer = [NSTimer scheduledTimerWithTimeInterval:0.6666 target:self selector:#selector(playAnswerAnimSound) userInfo:nil repeats:NO];
answerAnimCounter++;
}
else if(answerAnimCounter == 3)
{
answerAnimCounter =0;
[answerAnimTimer invalidate];
}
}
}
The sound duration is 1 second.
Regards
You cannot sync audio by just generating calls to audio services at time intervals, you need to actually render out a .wav or .m4a file with all the audio clips already spaced out in time. Then, playback the generated audio as 1 longer clip and sync the video to the audio. See the linked answer for more details about the implementation.
I use use AVPlayer to implement a custom player.
Some video playerItem provide the current time and wrong duration. After to seek time use slide to seek time many times. Call the API
When I seek to zero, some video can not be precisely seeked.
[self.player seekToTime:CMTimeMakeWithSeconds(time, NSEC_PER_SEC)
toleranceBefore:CMTimeMake(1, 1)
toleranceAfter:CMTimeMake(1, 1)
completionHandler:^(BOOL finished) {
if (finished) {
IVCLogV(#"seek finish!");
}
else
{
IVCLogV(#"seek interrupted");
}
if (completionHandle) {
completionHandle(finished);
}
}];
I change the codes according the mediaTime.timeScale. Now I discover the video stream have changed the video duration and current time after several play.
Make sure that the Timescale of the media being played matches with your timescale. I can see you have used NSEC_PER_SEC as timescale. You may have to scale your CMTime input to seelTo method.
CMTime timeAccordingToMediaTimescale = CMTimeConvertScale(time, mediaTime.timescale, CMTimeRoundingMethod);
I am using MVMoviePlayer to play videos in the app. Right now, a black screen comes after taping the play button and the video starts playing. But, the black screen is casing some discofort from the user end point of view. So, i want to start the video from a paused state.
In order to do this, i thought of putting the player to paused state before playing it..
Is there a way to do this???
You can hide your MPMoviePlayer until that annoying black flicker is gone.
To ensure that the black flicker is gone, you can check if the MPMoviePlayer's loadState is 3 ( which means MPMovieLoadStatePlayable | MPMovieLoadStatePlaythroughOK ) and playbackState is 1 (which means MPMoviePlaybackStatePlaying)
First hide your MPMoviePlayer:
yourMPMoviePlayer.view.hidden = YES;
Just add an observer to be notified when loadState changes:
[NSNotificationCenter.defaultCenter addObserver:self
selector:#selector(loadStateChanged:)
name:MPMoviePlayerLoadStateDidChangeNotification
object:nil];
And make your MPMoviePlayer visible again when you are notified and conditions are met:
- (void)loadStateChanged:(NSNotification *)sentNotification
{
if (player.loadState == (MPMovieLoadStatePlaythroughOK | MPMovieLoadStatePlayable) && player.playbackState == MPMoviePlaybackStatePlaying)
yourMPMoviePlayer.view.hidden = NO;
}