I'm switching from MPMoviePlayerController to AVPlayer as I need finer grained control over video swapping. The .mov file I was playing with MPMoviePlayerController played fine, but after switching to AVPlayer I hear the audio from the video, but the video just shows the view background that I added the AVPlayerLayer to. Here's how I'm initializing the AVPlayer.
self.player = [[AVPlayer alloc] initWithURL:video];
AVPlayerLayer* playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
playerLayer.frame = self.playerContainer.bounds;
[self.playerContainer.layer addSublayer:playerLayer];
Then later I just issue a.
[self.player play];
When the video plays I hear the audio, but see no video. I also tried setting the zPosition to no luck.
playerLayer.zPosition = 1;
Found out it was a result of using AutoLayout. In the viewDidLoad the self.playerContainer.bounds is a CGRectZero.
I had to assign the playerLayer frame in the viewDidAppear to match the playerContainer.
Since we use AVPlayerLayer (a subclass of CALayer), we need to set the frame
- (void)viewDidLayoutSubviews {
[super viewDidLayoutSubviews];
self.avPlayerLayer.frame = self.movieContainerView.bounds;
}
Make sure you the statement that plays the video:
[self.player play]
is invoked from main dispatch queue like this (Swift 3):
DispatchQueue.main.async {
self.player.play()
}
Related
I create the AVAudioPlayer object and play the music within the scene, if i transition through to another scene and then go back to the original scene it creates another object and plays the same soundtrack twice. How do i overcome this ?
NSURL *url = [[NSBundle mainBundle] URLForResource:#"backgroundMusic" withExtension:#"mp3"];
self.backgroundMusic = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
self.backgroundMusic.numberOfLoops = -1;
[self.backgroundMusic prepareToPlay];
if (self.backgroundMusic.playing == NO) {
[self.backgroundMusic play];
}
Well what do you want to do?
Do you want to play music only in that scene? Well then before you transition, stop the avaudioplayer.
[audioplayer stop];
Or, maybe you want to start music in the scene, and let it just continue playing if you leave the scene or go back to the scene?
Well then you would need a seperate wrapper class for your music. Create a class, and just put a call to it to play music. You can check the .playing property to know if music is already playing or not.
I have some questions related to AVPlayer which are:
When we pause the AVPlayer through [player pause] does the AVPlayer keep buffering the video from the network or does it just stop? I couldn't get any info related to this in apple's documentation. Also, is it possible to force the AVPlayer to keep buffering while in pause, so that if we have the paused video is in waiting for the first video to be ended then we wouldn't find any gap in between the videos?
On pausing the AVPlayer can we have any event on [player pause].
Can we show still image on AVPlayer for some seconds?
Thanks
1) AVPlayer will buffer the video in several cases, none cleary documented. I'd say you can expect buffering when you init the video, and when you replace the current item.
You can observe currentItem.loadedTimeRanges to know what's going on. That property will tell you which video time ranges has been loaded.
Also, there is a few other currentItem properties that may help you: playbackLikelyToKeepUp, playbackBufferFull and playbackBufferEmpty.
Achieving a perfect gapless playback is not easy.
/* player is an instance of AVPlayer */
[player addObserver:self
forKeyPath:#"currentItem.loadedTimeRanges"
options:NSKeyValueObservingOptionNew
context:kTimeRangesKVO];
In observeValueForKeyPath:ofObject:change:context::
if (kTimeRangesKVO == context) {
NSArray *timeRanges = (NSArray *)[change objectForKey:NSKeyValueChangeNewKey];
if (timeRanges && [timeRanges count]) {
CMTimeRange timerange = [[timeRanges objectAtIndex:0] CMTimeRangeValue];
NSLog(#" . . . %.5f -> %.5f", CMTimeGetSeconds(timerange.start), CMTimeGetSeconds(CMTimeAdd(timerange.start, timerange.duration)));
}
}
2) Just keep an eye on player.rate.
[player addObserver:self
forKeyPath:#"rate"
options:NSKeyValueObservingOptionNew
context:kRateDidChangeKVO];
Then in your observeValueForKeyPath:ofObject:change:context::
if (kRateDidChangeKVO == context) {
NSLog(#"Player playback rate changed: %.5f", player.rate);
if (player.rate == 0.0) {
NSLog(#" . . . PAUSED (or just started)");
}
}
3) You can build a movie of a given length using a still image but it's easier to use a regular UIImageView on top of the player. Hide/show it when needed.
Sample project: feel free to play with the code I wrote to support my answer.
I just created AVPlayer and it plays music well. I have two questions
How to play another music from another URL (should I stop current player?)
How to show current time of the song in UISlider (actually is it a method that called when the song is playing?)
Use -[AVPlayer replaceCurrentItemWithPlayerItem] to replace the current playing item reusing the player instance. You can create an item with an URL or with an asset.
In order to know when a given item finishes playing use the notification AVPlayerItemDidPlayToEndTimeNotification.
Use -[AVPlayer addPeriodicTimeObserverForInterval] to perform some action periodically while the player is playing. See this example:
[self.player addPeriodicTimeObserverForInterval:CMTimeMakeWithSeconds(0.1, 100)
queue:nil
usingBlock:^(CMTime time) {
<# your code will be called each 1/10th second #>
}];
1) If you used - (id)initWithURL:(NSURL *)URL then you should stop player with pause, dealloc it and create new instance.
AVPlayer *player = [AVPlayer alloc] initWithURL:[NSURL URLWithString:#"http:/someurl.com"]];
[player play];
[player pause];
[player release];
player = [AVPlayer alloc] initWithURL:[NSURL URLWithString:#"http:/someurl2.com"]];
[player pause];
[player release];
If you used playerWithURL, then just call the same line again.
2). The easiest is the get duration of the current item https://stackoverflow.com/a/3999238/619434 and then update the UISlider with that value. You can use NSTimer to periodically check the duration.
self.player.currentItem.asset.duration
I want to make an app where users can create funny stick figure animations.
It would be cool if it is possible to export them as video. Can I "draw" video frames frame by frame and render them into a H.264 or other video format?
The length will be between 2 seconds and 5 minutes. I heared a while back that there is a framework to edit video but in my case I really need to create a video from scratch. What are my options?
You might need to use a multimedia framework which provides more lower level control, like gstreamer or ffmeg.
Alternately, you can create an MJPEG and figure out a way to transcode it.
Yes, you can examine :
CEMovieMaker
Usage:
UIImage *frameImg = <Some Image>;
NSDictionary *settings = [CEMovieMaker videoSettingsWithCodec:AVVideoCodecTypeH264
withWidth:source.size.width
andHeight:source.size.height
];
///
CEMovieMaker * movieMaker = [[CEMovieMaker alloc] initWithSettings:settings];
/// Complete video
[movieMaker createMovieFromImages:[self.movieImages copy] withCompletion:^(NSURL *fileURL){
//AVPlayerViewController or
MPMoviePlayerViewController *playerController = [[MPMoviePlayerViewController alloc] initWithContentURL:fileURL];
[playerController.view setFrame:self.view.bounds];
[self presentMoviePlayerViewControllerAnimated:playerController];
[playerController.moviePlayer prepareToPlay];
[playerController.moviePlayer play];
[self.view addSubview:playerController.view];
}];
-(void)initAndPlayMovie:(NSURL *)movieURL
{
// Initialize a movie player object with the specified URL
MPMoviePlayerController *mp = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
if (mp)
{
self.moviePlayer = mp;
[mp release];
[self.moviePlayer play];
}
}
Here, in above code, We can pass just one movie URL. Isn't it possible to pass multiple urls to it?
So, Movie Player will load second url after playing first one.
Is it possible? How can we do that?
Right now, when I try to pass other url, after finishing first one.
- (void) moviePlayBackDidFinish:(NSNotification*)notification
{
[self initAndPlayMovie:secondURL];
}
The Device First change its orientation while loading and after loading Device again come back to landscape mode.
How to resolve this problem?
You might want to change the orientation by changing the statusBar orientation before you start playing videos and change it back after you are done with all.
[[UIApplication sharedApplication] setStatusBarOrientation: UIInterfaceOrientationLandscapeRight animated:YES];
You should be able to call setContentURL just as the first movie is about to close to change to another movie. Check endPlaybackTime and fire off your method to invoke setContentURL one second prior to the movie ending.