[Bug 788869] Play variant streams of m3u8 file about HLS, can not switch subtitles

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788869

--- Comment #1 from tianyahai <490202531 at qq.com> ---
g_object_set (data.playbin, "uri",
"http://10.167.232.42:8080/streaming/examples/bipbop_16x9/bipbop_16x9_variant.m3u8",
NULL);

#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="English",DEFAULT=YES,AUTOSELECT=YES,FORCED=NO,LANGUAGE="en",CHARACTERISTICS="public.accessibility.transcribes-spoken-dialog,
public.accessibility.describes-music-and-sound",URI="subtitles/eng/prog_index.m3u8"

#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="English
(Forced)",DEFAULT=NO,AUTOSELECT=YES,FORCED=YES,LANGUAGE="en",URI="subtitles/eng_forced/prog_index.m3u8"

#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="Français",DEFAULT=NO,AUTOSELECT=YES,FORCED=NO,LANGUAGE="fr",CHARACTERISTICS="public.accessibility.transcribes-spoken-dialog,
public.accessibility.describes-music-and-sound",URI="subtitles/fra/prog_index.m3u8"

#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="Français
(Forced)",DEFAULT=NO,AUTOSELECT=YES,FORCED=YES,LANGUAGE="fr",URI="subtitles/fra_forced/prog_index.m3u8"

#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="Español",DEFAULT=NO,AUTOSELECT=YES,FORCED=NO,LANGUAGE="es",CHARACTERISTICS="public.accessibility.transcribes-spoken-dialog,
public.accessibility.describes-music-and-sound",URI="subtitles/spa/prog_index.m3u8"

#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="Español
(Forced)",DEFAULT=NO,AUTOSELECT=YES,FORCED=YES,LANGUAGE="es",URI="subtitles/spa_forced/prog_index.m3u8"
#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="日本語",DEFAULT=NO,AUTOSELECT=YES,FORCED=NO,LANGUAGE="ja",CHARACTERISTICS="public.accessibility.transcribes-spoken-dialog,
public.accessibility.describes-music-and-sound",URI="subtitles/jpn/prog_index.m3u8"

#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="日本語
(Forced)",DEFAULT=NO,AUTOSELECT=YES,FORCED=YES,LANGUAGE="ja",URI="subtitles/jpn_forced/prog_index.m3u8"

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