[Slackbuilds-users] vlc slackbuild

Tim Dickson dickson.tim at googlemail.com
Sun Feb 24 00:06:43 UTC 2019

On 23/02/2019 03:17, Christoph Willing wrote:
> On 23/2/19 3:51 am, Tim Dickson via SlackBuilds-users wrote:
>> On 22/02/2019 12:51, Christoph Willing wrote:
>>> On 22/2/19 8:33 pm, Tim Dickson via SlackBuilds-users wrote:
>>>> vlc was built with the options OPENCV=yes WAYLAND=yes
>>>> I can provide all the build options chosen for all the deps if it would
>>>> help.
>>> I admit that I don't test that particular option combination very often.
>>> I just rebuilt vlc with OPENCV=yes (using opencv-legacy) and a quick
>>> test of the resulting vlc was fine.
>>> However the wayland option is quite time consuming to test since it
>>> requires qt5 to have been (re)built with wayland, wayland-egl &
>>> wayland-protocols already installed. It's now late enough here that it
>>> will be an overnight job to rebuild qt5 and then vlc.
>>> In the meantime, could you build & test vlc without wayland support?
>>> Success there would indicate that wayland support is the problem. Then
>>> we'd have to figure out a possible fix or just not support that option
>>> any more.
>>> chris
>> I've now also tried the other way around, enable wayland and disable
>> opencv (legacy) and it now runs without seg-faulting, which is the
>> opposite result of your test!. I'm open to more suggestions, although at
>> least it runs now,
> I finished building wayland enabled (but otherwise standard) qt5 and vlc
> in a stock 14.2 x86_64 VM with opencv-legacy. It runs normally - no
> segfault and I can play a test video with it.
> When run it from a terminal, the only new output is:
>      libEGL warning: DRI2: failed to authenticate
> but it has no apparent effect to the running vlc.
> Since you're segfault-free after removing opencv-legacy, I guess that's
> the place to look for a cause - perhaps some exotic option it's built with?
(looking at opencv-legacy, I built it will all options, including ffmpeg 
which is a recursive dependency via frie0r)
> chris
Although without opencv , vlc starts up ok, when I try to play an mp4 
video file i get

codec not supported
VLC could not decode the format "h264" (H264 -MPEG-4 AVC (part 10))

despite the fact that vlc and ffmpeg have been compiled with everything
(all required and optional dependencies) except libva and libva-intel-driver
(as I use amd apu's.)
any ideas?

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