Bug 226314

Summary:

IOS Native player caption font size is varying from small to big as the video plays in full screen

Product:

WebKit

Reporter:

Karthik Sundari <karthiksundari2315>

Component:

Media

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Minor

CC:

eric.carlson, jer.noble, peng.liu6, webkit-bug-importer

Priority:

Keywords:

InRadar

Version:

Safari 14

Hardware:

iPhone / iPad

OS:

iOS 14

Attachments:

Description	Flags
Test video showing varying captions	none

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
View All Add attachment proposed patch, testcase, etc.

Radar WebKit Bug Importer

Comment 1 2021-06-02 20:45:23 PDT

<rdar://problem/78796280>

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