trying to play a video with AVPlayer like this:
if let video = card.pageImageVideoController.controllers[0] as? VideoController{
video.player.play()
}
I noticed that the video doesn't play. So I inspected deeper and found out that when I call the function .play() the AVPlayer current Item is nil.
I thought that the solution for this should be to add KVO observer for the player to see when the item is ready to play. I used this stack overflow question.
And I modified the previous code like this:
var playbackLikelyToKeepUpContext = 0
if let video = card.pageImageVideoController.controllers[0] as? VideoController{
video.player.addObserver(self, forKeyPath: "currentItem.playbackLikelyToKeepUp",
options: .new, context: &playbackLikelyToKeepUpContext)
}
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
guard let videoController = topCard!.pageImageVideoController.controllers[0] as? VideoController else { return }
if context == &playbackLikelyToKeepUpContext {
if videoController.player.currentItem!.isPlaybackLikelyToKeepUp {
// loadingIndicatorView.stopAnimating() or something else
print("ready")
} else {
// loadingIndicatorView.startAnimating() or something else
print("not ready")
}
}
}
But the function observeValue is never called. I don't know why.
If your idea is to check if the item is ready to play or not. Then better you put observer for status. And check error in the observer function. As mentioned in the following document:
https://developer.apple.com/documentation/avfoundation/avplayeritem
Related
I have an AVQueuePlayer that gets songs from a Firebase Storage via their URL and plays them in sequence.
static func playQueue() {
for song in songs {
guard let url = song.url else { return }
lofiSongs.append(AVPlayerItem(url: url))
}
if queuePlayer == nil {
queuePlayer = AVQueuePlayer(items: lofiSongs)
} else {
queuePlayer?.removeAllItems()
lofiSongs.forEach { queuePlayer?.insert($0, after: nil) }
}
queuePlayer?.seek(to: .zero) // In case we added items back in
queuePlayer?.play()
}
And this works great.
I can also make the lock screen controls appear and use the play pause button like this:
private static func setRemoteControlActions() {
let commandCenter = MPRemoteCommandCenter.shared()
// Add handler for Play Command
commandCenter.playCommand.addTarget { [self] event in
queuePlayer?.play()
return .success
}
// Add handler for Pause Command
commandCenter.pauseCommand.addTarget { [self] event in
if queuePlayer?.rate == 1.0 {
queuePlayer?.pause()
return .success
}
return .commandFailed
}
}
The problem comes with setting the metadata of the player (name, image, etc).
I know it can be done once by setting MPMediaItemPropertyTitle and MPMediaItemArtwork, but how would I change it when the next track loads?
I'm not sure if my approach works for AVQueueplayer, but for playing live streams with AVPlayer you can "listen" to metadata receiving.
extension ViewController: AVPlayerItemMetadataOutputPushDelegate {
func metadataOutput(_ output: AVPlayerItemMetadataOutput, didOutputTimedMetadataGroups groups: [AVTimedMetadataGroup], from track: AVPlayerItemTrack?) {
//look for metadata in groups
}
}
I added the AVPlayerItemMetadataOutputPushDelegate via an extension to my ViewController.
I also found this post.
I hope this gives you a lead to a solution. As said I'm not sure how this works with AVQueuePlayer.
Ive been trying to add an observer to listen to AVPlayer's "timeControlStatus", mostly taken dirrectly from Apple's example;
https://developer.apple.com/documentation/avfoundation/media_playback_and_selection/observing_playback_state
I created a sperate class called Play and im calling the below from the ViewController
Play().playMusic(url: url!)
Class Play()
import Foundation
import AVFoundation
var player: AVPlayer! = nil
var playerItemContext = 0
class Play: AVPlayer {
func playMusic(url : URL) {
let asset = AVAsset(url: url)
let playerItem = AVPlayerItem(asset: asset)
if player == nil {
player = AVPlayer(playerItem: playerItem)
if player.status.rawValue == 0 {
player.play()
player.addObserver(player, forKeyPath: "timeControlStatus", options: [.old, .new], context: &playerItemContext)
}
} else {
player.replaceCurrentItem(with: playerItem)
player.play()
}
}
override func observeValue(forKeyPath keyPath: String?,
of object: Any?,
change: [NSKeyValueChangeKey : Any]?,
context: UnsafeMutableRawPointer?) {
// Only handle observations
guard context == &playerItemContext else {
super.observeValue(forKeyPath: keyPath,
of: object,
change: change,
context: context)
return
}
if keyPath == "timeControlStatus" { print("Result") }
}
}
The above always crashes with;
<AVPlayer: 0x6000030a4770>: An -observeValueForKeyPath:ofObject:change:context: message was received but not handled.
Key path: timeControlStatus
Observed object: <AVPlayer: 0x6000030a4770>
Change: {
kind = 1;
new = 1;
old = 1;
}
Context: 0x1003f3e98'
If I remove the 'addObserver', the code acts as intended and plays the audio file, the weird thing is, if move all the observer code from the Play class over to ViewContoller it works? what gives?.
The difference is merely that when you move the code to the view controller, the view controller persists. It is a stable object living in the view controller hierarchy. So it lives long enough to do some work.
But on the other hand, in this line:
Play().playMusic(url: url!)
...the Play instance is created and immediately goes out of existence again, like a quantum virtual particle. It doesn't live long enough to be there when the playing proceeds. Hence the crash: you have allowed the observer to go out of existence too soon.
If you wanted your Play instance to persist, you would need to assign it to some long-lived variable, such as a property of your view controller.
my problem is that when having very bad connection,the activtiy indicator start animating till first frame in video is shown,then disappear thinking is the video is playing,but the video stops playing stuck on loaded first frame,until the whole video is loaded then its resume playing,how to show activity indicator while video is stuck on frame and buffering ,then play until next loaded frame ?
notes:
it's working when internet connetion is off ,video is played until the loaded frame and activity indicator is shown,then when turn on video us resumed to play and activity indicator is hidden
it's working when normal internet connection is present
removing and showing indicator using override observevalue for key path
"currentItem.loadedTimeRanges"/"currentItem.playbackBufferEmpty"
i made a uiview class with avplayer in it
import UIKit
import AVKit
import AVFoundation
class videoplaying: UIView {
override static var layerClass: AnyClass {
return AVPlayerLayer.self;
}
var playerlayer: AVPlayerLayer{
return layer as! AVPlayerLayer;
}
var player: AVPlayer?{
get{
return playerlayer.player
}
set {
playerlayer.player = newValue
}
}
var playetitem: AVPlayerItem?
}
i assigned a uivew in uicollectioncell to this class(using storyboard)
avplayer starts playing and adding observes when pressing play in uicollectioncell
#IBAction func play(_ sender: Any) {
activityindicator.isHidden = false
activityindicator.startAnimating()
self.butttoonheight.isHidden = true
self.postimage.isHidden = true
let url2 = URL(string: "https://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4")
let avplayer = AVPlayer(url: url2! )
let playeritem = AVPlayerItem(url: url2!)
//videoss is class of type uiview
videoss.playetitem = playeritem
videoss.playerlayer.player = avplayer
videoss.player?.play()
videoss.player?.addObserver(self, forKeyPath: "currentItem.loadedTimeRanges", options: .new, context: nil)
videoss.player?.addObserver(self, forKeyPath: "rate", options: .new
, context: nil)
videoss.player?.addObserver(self, forKeyPath: "currentItem.playbackBufferEmpty", options: .new, context: nil)
playying.isHidden = false
}
//observing when video is playing
//playpause button to play or pause video while bad network is present video is stuck on first frame and playorpause is not changing while pressed
#IBAction func playorpause(_ sender: Any) {
if videoss.player?.timeControlStatus == AVPlayerTimeControlStatus.paused{
videoss.player?.play()
playying.setImage(UIImage(named: "pas50"), for: .normal)
}
if videoss.player?.timeControlStatus == AVPlayerTimeControlStatus.playing{
videoss.player?.pause()
playying.setImage(UIImage(named: "p24"), for: .normal)
}
}
override public func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if keyPath == "rate"{
print(videoss.player?.rate)
if videoss.player?.rate == 0.0 {
print("dawdaopwdaopwdipo")
}
}
if keyPath == "currentItem.loadedTimeRanges"{
print("its is working")
activityindicator.stopAnimating()
activityindicator.isHidden = true
}
if keyPath == "currentItem.playbackBufferEmpty"
{
activityindicator.startAnimating()
activityindicator.isHidden = false
print("pkawdawdawd")
}
}
I solved this problem by adding a timer that runs ever 0.3 seconds,evrry 0.3seconds it checks the current time of the video if current time equals previous time then the video is not playing activity indicator is shown,if not video if playing activity indicators was hidden,also you need to check if the users pause the video,an advantage is you also get the current time also in the same function.
What i tried also was seeing rate of the video ,but over slow internet the rate was always giving that is playing,but it wasn’t,which didn’t help
In my app, OneVC is one of child ViewControllers of PageViewController, TwoVC is the embed view controller of OneVC's Container View.
When the user drag the scroll view in OneVC, I want the drag action can be not just update the content in OneVC from web API, but notify TwoVC to update too.
Both OneVC and TwoVC will appear at interface at the same time when launch.
I'm following Apple's "Using Swift with Cocoa and Objective-C" "Key-Value Observing" instruction to imply KVO, but no notification is sent when the observed property changes. Please see below my code:
OneVC is the object to be observed.
class OneVC: UIViewController, UIScrollViewDelegate {
dynamic var isDragToUpdate = false
func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool) {
if scrollView.contentOffset.y < -150 {
if isDragToUpdate {
isDragToUpdate = false
} else {
isDragToUpdate = true
}
print(isDragToUpdate)
}
}
}
TwoVC is the observer
class TwoVC: UIViewController {
let oneVC = OneVC()
override viewDidLoad() {
oneVC.addObserver(self, forKeyPath: "isDragToUpdate", options: [], context: nil)
}
override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
print("hoh")
guard keyPath == "isDragToUpdate" else {return}
print("hah")
}
deinit {
oneVC.removeObserver(self, forKeyPath: "isDragToUpdate")
}
}
I checked row by row, and find many other stackoverflow answers, but still no idea what's going wrong on my code, when drag and release the scrollview, none of "hoh" and "hah" are print in console, except print(isDragToUpdate) is printed properly.
Thank you in advance!
I have AVPlayer that load video from url and put player inside AVPlayerViewController but I do not want to buffer and download video until user press play button. How should I do it?
var player: AVPlayer = AVPlayer(URL: nsurl)
var newVideoChunk: AVPlayerViewController = AVPlayerViewController()
newVideoChunk.player = player
AVPlayerViewController with AVPlayer from NSURL?
You will need to setup the video asset and create a playerItem with that NSURL based asset. Then you will need to add an observer to that playerItem (immediately):
self.playerItem?.addObserver(self, forKeyPath: "status", options: NSKeyValueObservingOptions.New, context: Constants.AVPlayerStatusObservationContext)
From within the key value observer routine you can trap the context and call an external function:
override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
//
if context == Constants.AVPlayerStatusObservationContext {
if (keyPath! == "status") {
if (player!.status == AVPlayerStatus.ReadyToPlay) {
print("ready")
readyToPlay()
} else if (player!.status == AVPlayerStatus.Failed) {
// something went wrong. player.error should contain some information
} else if (player!.status == AVPlayerStatus.Unknown) {
print("unknown")
}
}
}
}
If you only want to handle the buffering and download when the button is clicked then make sure you add the observer only within the button action method. This will work just as well with a file URL as an online URL.
Please check my sample gist for more information:
VideoPlayerViewController.swift