[FFmpeg-user] mov_text subtitles with HTML formatting crash iOS/iTunes

Mirko Klemm mirko at cm-klemm.de
Mon Dec 14 13:04:24 CET 2015

Hi all,
I have an SRT subtitle with embedded HTML formatting („<i>….</i>“). When this is converted to a mov_text subtitle and muxed into an MP4 with ffmpeg, playback of the video crashes player software on Apple T,  iOS and QuickTime on Mac OS X 10.11 at exactly the timecode when the formatted subtitle is supposed to appear, even if subtitle playback is turned off. 
However, VLC 2.2.1 on Mac OS X plays the same file OK, and renders the <i>…</i> sections correctly in italic.
How can I format a subtitle in italic so it plays well with Apple software?

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