[Webkit-unassigned] [Bug 226314] New: IOS Native player caption font size is varying from small to big as the video plays in full screen

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226314

            Bug ID: 226314
           Summary: IOS Native player caption font size is varying from
                    small to big as the video plays in full screen
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: karthiksundari2315 at gmail.com

Created attachment 429838

  --> https://bugs.webkit.org/attachment.cgi?id=429838&action=review

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"
```

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