Summary On iOS 26, HLS alternate audio track selection behaves inconsistently on both VOD and live streams: the French track falls back to the DEFAULT=YES (English) track after manual selection, and in some cases switching to a non-default track appears to work but it is then impossible to switch back to English. Environment iOS version: 26 Players affected: native Safari on iOS 26 and THEOplayer (issue also reproducible on THEOplayer's own demo page) Stream type: HLS/CMAF with demuxed alternate audio renditions (CMFC container) Affected stream types: both VOD and live streaming Issue NOT present on iOS 17/18 Manifest #EXTM3U #EXT-X-VERSION:4 #EXT-X-INDEPENDENT-SEGMENTS #EXT-X-STREAM-INF:BANDWIDTH=8987973,AVERAGE-BANDWIDTH=8987973,VIDEO-RANGE=SDR,CODECS=avc1.640028,RESOLUTION=1920x1080,FRAME-RATE=29.970,AUDIO=program_audio video_1080p.m3u8 #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID=program_audio,LANGUAGE=en,ASSOC-LANGUAGE=en,NAME=English,AUTOSELECT=YES,DEFAULT=YES,CHANNELS=2,URI=audi
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