Bug#665732: reopen: vlc: GUI latency/unresponsiveness to clicks on control options

[Rémi Denis-Courmont]

tags 665732 + wontfix
thanks

	Hello,

Unfortunately, changing volume with ALSA is intrinsically slow because ALSA 
does not support volume internally. If this is a problem for you, you can 
either reduce the VLC caching values, or use PulseAudio.

I believe there are no ways to fix this without changing the configuration, 
hence wontfix.


Le mardi 15 mai 2012 17:26:51, Dirk Griesbach a écrit :
> reopen 665732
> Package: vlc
> Version: 2.0.1-4+b2
> 
> I reopened the bug because it's not just about a minimal latency or a
> long standing behavior. Under certain circumstances, the delay is in the
> range of 10th of seconds and this definitely wasn't the case with pre
> 2.0 vlc. I found a report[1] in the vlc forum which sounds like the same
> problem so we should try to find the culprit.
> 
> My observation so far:
> 
> * I absolutely can not recognize any delay with ogg audio files.
> * volume change while playing wav or mp3 introduces a variable delay of
>   multiple seconds - I even had the 30 second experience like in the
>   linked forum thread.
> * This is not only related to the volume change but the whole GUI is
>   stalled. No reaction on menu or button press actions.
> * With some other cpu load, the delay will vanish (or at least be
>   minimized). E.g. playing another file in one instance and playing the
>   delaying mp3 in another instance (no dbus invoked); or simple do a
>   `cat /dev/zero > /dev/null`
> * If the system is idling again (apart from playing mp3), the delay is
>   back again, too.
> * Doing some click-e-di-click on the desktop while waiting for the GUI and
>   sound to respond causes the GUI to react and the volume to change.
> * No remarkable delay with the vlc web interface
> * and last but not least: Pause the song, change volume, resume playing.
>   No delay except for the pause-play part. ;-)
> 
> For me it looks like some event/timer stuff isn't working as it should
> be and maybe it's just only the Qt-interface?
> 
> Regards,
> Dirk
> 
> [1] http://forum.videolan.org/viewtopic.php?f=13&t=98180&p=327950#p327950
> 
> -- System Information:
> Debian Release: wheezy/sid
>   APT prefers unstable
>   APT policy: (500, 'unstable')
> Architecture: i386 (i686)
> 
> Kernel: Linux 3.2.0-2-686-pae (SMP w/2 CPU cores)
> Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
> 
> Versions of packages vlc depends on:
> ii  libaa1                    1.4p5-39
> ii  libavcodec53              6:0.8.2-1
> ii  libavutil51               6:0.8.2-1
> ii  libc6                     2.13-32
> ii  libfreetype6              2.4.9-1
> ii  libfribidi0               0.19.2-3
> ii  libgcc1                   1:4.7.0-8
> ii  libgl1-mesa-glx [libgl1]  8.0.2-2
> ii  libice6                   2:1.0.8-2
> ii  libqtcore4                4:4.8.1-1
> ii  libqtgui4                 4:4.8.1-1
> ii  libsdl-image1.2           1.2.12-2
> ii  libsdl1.2debian           1.2.15-3
> ii  libsm6                    2:1.2.1-2
> ii  libstdc++6                4.7.0-8
> ii  libtar0                   1.2.11-8
> ii  libva-x11-1               1.0.15-4
> ii  libva1                    1.0.15-4
> ii  libvlccore5               2.0.1-4+b2
> ii  libx11-6                  2:1.4.99.901-2
> ii  libxcb-composite0         1.8.1-1
> ii  libxcb-keysyms1           0.3.8-1
> ii  libxcb-randr0             1.8.1-1
> ii  libxcb-render0            1.8.1-1
> ii  libxcb-shape0             1.8.1-1
> ii  libxcb-shm0               1.8.1-1
> ii  libxcb-xfixes0            1.8.1-1
> ii  libxcb-xv0                1.8.1-1
> ii  libxcb1                   1.8.1-1
> ii  libxext6                  2:1.3.1-2
> ii  libxinerama1              2:1.1.2-1
> ii  libxpm4                   1:3.5.10-1
> ii  ttf-freefont              20100919-1
> ii  vlc-nox                   2.0.1-4+b2
> ii  zlib1g                    1:1.2.7.dfsg-1
> 
> Versions of packages vlc recommends:
> ii  vlc-plugin-notify  <none>
> ii  vlc-plugin-pulse   <none>
> ii  xdg-utils          1.1.0~rc1+git20111210-6
> 
> Versions of packages vlc suggests:
> pn  videolan-doc  <none>
> 
> -- no debconf information

-- 
Rémi Denis-Courmont
http://www.remlab.net/