NEW 226314
IOS Native player caption font size is varying from small to big as the video plays in full screen 
https://bugs.webkit.org/show_bug.cgi?id=226314
Summary IOS Native player caption font size is varying from small to big as the video...
Karthik Sundari
Reported 2021-05-26 20:44:24 PDT
Created attachment 429838 [details] Test video showing varying captions When an HLS(M3U8) live stream with closed captions is played on the native player in full-screen landscape mode. The captions seem to vary from small to big causing a bad UX experience. Please find a sample manifest. ``` #EXTM3U #EXT-X-VERSION:4 #EXT-X-MEDIA:TYPE=CLOSED-CAPTIONS,GROUP-ID="cc",NAME="English",LANGUAGE="en",DEFAULT=YES,AUTOSELECT=YES,INSTREAM-ID="CC1" #EXT-X-STREAM-INF:BANDWIDTH=762800,CLOSED-CAPTIONS="cc",PROGRAM-ID=1,CODECS="avc1.4d401f,mp4a.40.5",RESOLUTION=512x288 EMP_CH4/track-muxed-repid-root_audio_video3-tc-.m3u8 #EXT-X-STREAM-INF:BANDWIDTH=1018000,CLOSED-CAPTIONS="cc",PROGRAM-ID=1,CODECS="avc1.4d401f,mp4a.40.5",RESOLUTION=640x360 EMP_CH4/track-muxed-repid-root_audio_video2-tc-.m3u8 #EXT-X-STREAM-INF:BANDWIDTH=2290400,CLOSED-CAPTIONS="cc",PROGRAM-ID=1,CODECS="avc1.4d401f,mp4a.40.5",RESOLUTION=1280x720 EMP_CH4/track-muxed-repid-root_audio_video1-tc-.m3u8 #EXT-X-STREAM-INF:BANDWIDTH=3635600,CLOSED-CAPTIONS="cc",PROGRAM-ID=1,CODECS="avc1.640020,mp4a.40.5",RESOLUTION=1280x720 EMP_CH4/track-muxed-repid-root_audio_video0-tc-.m3u8 #EXT-X-I-FRAME-STREAM-INF:BANDWIDTH=352360,PROGRAM-ID=1,CODECS="avc1.640020",RESOLUTION=1280x720,URI="*****/track-iframe-repid-iframe0-tc-.m3u8" ```
Attachments
Test video showing varying captions (37.26 MB, video/quicktime)
2021-05-26 20:44 PDT, Karthik Sundari 		no flags
Details
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Radar WebKit Bug Importer
Comment 1 2021-06-02 20:45:23 PDT
<rdar://problem/78796280>
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