所以我正在处理一个带有字幕轨道的视频,我正在尝试访问每个视频的名称和语言代码以显示在菜单中。目前我在做:
AVMediaSelectionGroup *selectionGroup = [self.currentAsset mediaSelectionGroupForMediaCharacteristic:AVMediaCharacteristicLegible];
NSArray *subtitles = selectionGroup.options;
self.subtitlesOptions = [NSMutableArray arrayWithObject:@{ @"label": @"Off", @"value": @"off" }];
for(AVMediaSelectionOption *track in subtitles) {
NSString *title = track.displayName; // This isn't right
NSString *language = track.locale.localeIdentifier;
[self.subtitlesOptions addObject:@{ @"label":title, @"value":language }];
}
当我打印每个 track
对象时,我得到类似下面的内容。
<AVMediaSelectionKeyValueOption: 0x171c79c40, language = engcc, mediaType = 'sbtl', title = English Closed Captions>
我可以正确获取语言,但问题是 displayName
与 title
不相关,在这种情况下它实际上返回“engcc”而不是“English”隐藏式字幕”。有什么方法可以得到 title
吗?
最佳答案
我为您的问题找到了这个解决方案。工作正常。希望这会有所帮助。
for(AVMediaSelectionOption *track in subtitles) {
NSString *language = nil;
NSArray *contents = [AVMetadataItem metadataItemsFromArray:[mediaSelectionOption commonMetadata] withKey:AVMetadataCommonKeyTitle keySpace:AVMetadataKeySpaceCommon];
if ([contents count] > 0)
{
NSArray *titlesForPreferredLanguages = [AVMetadataItem metadataItemsFromArray:contents filteredAndSortedAccordingToPreferredLanguages:[NSLocale preferredLanguages]];
if ([titlesForPreferredLanguages count] > 0)
{
language = [[titlesForPreferredLanguages objectAtIndex:0] extendedLanguageTag];
}
if (language == nil)
{
language = [[contents objectAtIndex:0] extendedLanguageTag];
}
}
}
关于objective-c - 如何在 objective-c 中访问 AVMediaSelectionKeyValueOption 的属性?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43663188/