如果在系统设置中关闭隐藏式字幕,则不会显示字幕
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【中文标题】如果在系统设置中关闭隐藏式字幕,则不会显示字幕【英文标题】:Subtitles won't display if closed caption is off in system settings 【发布时间】:2019-05-31 02:02:09 【问题描述】:无论设备在辅助功能下设置了什么,我都在尝试显示字幕。目前,如果设备设置为英语并在设置中启用隐藏字幕,则会播放英文字幕,如果设备设置为西班牙语,则会播放西班牙语字幕。无论是否打开隐藏式字幕,我都希望播放字幕。
我试图从苹果的文档中添加this code,但它没有帮助。似乎可以正常读取选项,检测到西班牙语和英语字幕,但我无法让它们显示在屏幕上。
import UIKit
import AVFoundation
import AVKit
class ViewController : UIViewController
override func loadView()
let view = UIView()
view.backgroundColor = .white
self.view = view
override func viewDidLoad()
super.viewDidLoad()
guard let path = Bundle.main.path(forResource: "Lebron", ofType:"m4v")
else
debugPrint("File not Found")
return
let player = AVPlayer(url: URL(fileURLWithPath: path))
player.appliesMediaSelectionCriteriaAutomatically = false
let asset = AVAsset(url: URL(fileURLWithPath: path))
for characteristic in asset.availableMediaCharacteristicsWithMediaSelectionOptions
print("\(characteristic)")
// Retrieve the AVMediaSelectionGroup for the specified characteristic.
if let group = asset.mediaSelectionGroup(forMediaCharacteristic: characteristic)
// Print its options.
for option in group.options
print(" Option: \(option.displayName)")
if let group = asset.mediaSelectionGroup(forMediaCharacteristic: AVMediaCharacteristic.legible)
let locale = Locale(identifier: "en")
let options =
AVMediaSelectionGroup.mediaSelectionOptions(from: group.options, with: locale)
if let option = options.first
// Select Spanish-language subtitle option
player.currentItem!.select(option, in: group)
print("\(player.currentItem!.select(option, in: group))")
let playerViewController = AVPlayerViewController()
playerViewController.player = player
addChild(playerViewController)
playerViewController.view.frame = view.frame
view.addSubview(playerViewController.view)
playerViewController.didMove(toParent: self)
playerViewController.player?.seek(to: CMTime(seconds: 0, preferredTimescale: 1))
这是输出到控制台的内容
2019-05-30 21:52:21.432911-0400 subtitleTest[6438:1450671] [Accessibility] ****************** Loading GAX Client Bundle ****************
AVMediaCharacteristic(_rawValue: AVMediaCharacteristicAudible)
Option: Unknown language
AVMediaCharacteristic(_rawValue: AVMediaCharacteristicLegible)
Option: Spanish
Option: Spanish Forced
Option: English
Option: English Forced
()
设备应该显示与输入语言环境匹配的任何字幕文件,但它根本不显示任何字幕。
【问题讨论】:
我也发现了这个问题。强制字幕被选中,但根本不显示。 【参考方案1】:我最终得到了这个工作。这是我最终使用的代码。只需将LebronTestProdNamed
更改为您的视频文件的名称,并将.m4v
更改为您的视频文件的文件类型。
import UIKit
import AVFoundation
import AVKit
class ViewController : UIViewController
override func loadView()
let view = UIView()
view.backgroundColor = .white
self.view = view
var test = AVPlayerMediaSelectionCriteria()
override func viewDidLoad()
super.viewDidLoad()
guard let path = Bundle.main.path(forResource: "LebronTestProdNamed", ofType:"m4v")
else
debugPrint("File not Found")
return
let player = AVPlayer(url: URL(fileURLWithPath: path))
player.appliesMediaSelectionCriteriaAutomatically = false
let asset = AVAsset(url: URL(fileURLWithPath: path))
let playerItem = AVPlayerItem(asset: asset)
for characteristic in asset.availableMediaCharacteristicsWithMediaSelectionOptions
print("\(characteristic)")
// Retrieve the AVMediaSelectionGroup for the specified characteristic.
if let group = asset.mediaSelectionGroup(forMediaCharacteristic: characteristic)
// Print its options.
for option in group.options
print(" Option: \(option.displayName)")
// Create a group of the legible AVMediaCharacteristics (Subtitles)
if let group = asset.mediaSelectionGroup(forMediaCharacteristic: AVMediaCharacteristic.legible)
// Set the locale identifier to the value of languageID to select the current language
let locale = Locale(identifier: "en-EN")
// Create an option group to hold the options in the group that match the locale
let options =
AVMediaSelectionGroup.mediaSelectionOptions(from: group.options, with: locale)
// Assign the first option from options to the variable option
if let option = options.first
// Select the option for the selected locale
playerItem.select(option, in: group)
let playerViewController = AVPlayerViewController()
playerViewController.player = player
playerViewController.player?.replaceCurrentItem(with: playerItem)
addChild(playerViewController)
playerViewController.view.frame = view.frame
view.addSubview(playerViewController.view)
playerViewController.didMove(toParent: self)
playerViewController.player?.seek(to: CMTime(seconds: 0, preferredTimescale: 1))
【讨论】:
对于任何试图让它与 AVPlayer/AVPlayerLayer 一起工作的人,它没有。仅当像 @JoshHolme 那样嵌入到 AVPlayerViewController 中时才有效。以上是关于如果在系统设置中关闭隐藏式字幕,则不会显示字幕的主要内容,如果未能解决你的问题,请参考以下文章
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