[Bug 777213] hlsdemux: Re-expose only variant stream with bitrate switching

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777213

--- Comment #12 from tianyahai <490202531 at qq.com> ---
I try playbin3 to play my m3u8, if it only contain one stream as MediaPlaylist,
it's ok, if contains variant streams, it failed like below:
 ...
PREROLLING ...
... 100%  
(gst-launch-1.0:22408): GStreamer-CRITICAL **:
gst_stream_collection_get_stream: assertion 'GST_IS_STREAM_COLLECTION
(collection)' failed
Caught SIGSEGV
#0  0xb7765c31 in __kernel_vsyscall ()
#1  0xb736af8f in poll () at ../sysdeps/unix/syscall-template.S:84
#2  0xb74b6b20 in g_poll () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb74a811c in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb74a8539 in g_main_loop_run () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb763fd81 in gst_bus_poll (bus=0x8648e20, events=GST_MESSAGE_ANY, 
#6  0x0804ba1a in ?? ()
#7  0x0804a964 in ?? ()
#8  0xb72a6637 in __libc_start_main (main=0x804a3f0, argc=3, argv=0xbfac64b4, 
#9  0x0804b01c in ?? ()
Spinning.  Please run 'gdb gst-launch-1.0 22408' to continue debugging, Ctrl-C
to quit, or Ctrl-\ to dump core.

Why it's not ok, does playbin3 not support multi-rate m3u8 file?

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