[Bug 241543] VLC - built in subtitles in mkv can't be decoded

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241543

            Bug ID: 241543
           Summary: VLC - built in subtitles in mkv can't be decoded
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: skrechy at gmail.com

Hello,

I have FreeBSD 12.0 (amd64) with KDE5.
My version of VLC is latest from ports - 3.0.8.

When I open .mkv file and try to enable the built in subtitles in the mkv file
VLC outputs the following:

Unidentified codec:
VLC could not identify the audio or video codec


When I start the movie from the command line the following is printed on
stdout:
VLC media player 3.0.8 Vetinari (revision 3.0.8-0-gf350b6b5a7)
[00000008008e4060] main libvlc: Running vlc with the default interface. Use
'cvlc' to use vlc without interface.
[0000000800922160] mkv demux error: cannot find KaxSegment or missing mandatory
KaxInfo
[0000000800922360] main demux error: option sub-original-fps does not exist
libva info: VA-API version 1.5.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/local/lib/dri/radeonsi_drv_video.so
libva info: va_openDriver() returns -1
[00000008157f6560] glconv_vaapi_x11 gl error: vaInitialize: unknown libva error
libva info: VA-API version 1.5.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/local/lib/dri/radeonsi_drv_video.so
libva info: va_openDriver() returns -1
[00000008157f6560] glconv_vaapi_drm gl error: vaInitialize: unknown libva error
libva info: VA-API version 1.5.0
libva info: va_getDriverName() returns 1
libva error: va_getDriverName() failed with operation
failed,driver_name=radeonsi
[00000008157f6560] glconv_vaapi_drm gl error: vaInitialize: operation failed
Failed to open VDPAU backend Shared object "libvdpau_radeonsi.so" not found,
required by "vlc"


I'm dual booting FreeBSD with Ubuntu for sanity check and the same file with
the same version of VLC on Ubuntu is playing the subtitles fine. DragonPlayer
and Xine (on FreeBSD) are showing the subtitles fine. So, the problem should be
something in the VLC build for FreeBSD.

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