所以我正在使用带有字幕轨道的视频,我正在尝试访问每个字幕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 }]; }
当我打印每个轨道对象时,我会得到类似下面的内容.
<AVMediaSelectionkeyvalueOption: 0x171c79c40,language = engcc,mediaType = 'sbtl',title = English Closed Captions>
我可以正确地获得语言,但问题是displayName与title无关,在这种情况下它实际上返回“engcc”而不是“English Closed Captions”.有没有办法获得头衔?
解决方法
我为你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]; } } }
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