error: /usr/lib/mozilla/plugins/libvlcplugin.so: undefined symbol: NPP_Initialize

i've found that uninstalling the package: mozilla-plugin-vlc 1.1.7-1ubuntu1 stop firefox crashing

Same problem here. Uninstalling VLC helps, but problem recurs when re-installing VLC.

The current mozilla-plugin-vlc package is built for older versions of Firefox. Apparently, it is incompatible with 4.0. I don't know if it's a matter of rebuilding the VLC plugin or more complicated.

That said, I assume Firefox wouldn't crash if it loaded plugins with RTLD_NOW instead of RTLD_LAZY...

I have the same problem,

using Kubuntu Natty x86_64
mozilla-plugin-vlc (1.1.8-2ubuntu1)

Confirmed, Kubuntu Natty x86.

Not just video; the vlc plugin collects other media as well. I get the crash message when I point Firefox at http://localhost/~moses/brown_noise.mp3

Alternatives for webpage-embedded media vieweing may be:
- totem-mozilla
- xine-plugin
- browser-plugin-parole
- ... and I vaguely remember something using MPlayer, but I don't see it in the 11.04 "natty" repositories now.

Same problem here:

Firefox won't start anymore, giving the message

/usr/lib/firefox-4.0.1/firefox-bin: symbol lookup error: /usr/lib/mozilla/plugins/libvlcplugin.so: undefined symbol: NPP_Initialize

@drdim http://mailman.videolan.org/pipermail/vlc-devel/2010-October/077184.html

I adapted Rafał's patch from Gentoo to Ubuntu. Note, it does a full copy of the old npunix.c to a new npunix.cpp with the changes included: this was the only way I could make the patch so that dpkg-buildpackage would apply it without failing.

To apply, put it into vlc-1.1.9/debian/patches/ and add a line containing the patch name to vlc-1.1.9/debian/patches/series. Then you should be able to use dpkg-buildpackage like usual.

Confirmed with Chrome @ 11.4 (64bit)

/opt/google/chrome/chrome --type=plugin --plugin-path=/usr/lib/mozilla/plugins/libvlcplugin.so --lang=en-US --plugin-data-dir=/home/willem/.config/google-chrome/Default --channel=20332.0x72e7200.304249051: symbol lookup error: /usr/lib/mozilla/plugins/libvlcplugin.so: undefined symbol: NPP_Initialize

Already fixed in VLC 1.1.10.

This bug was fixed in the package vlc - 1.1.10-1ubuntu1

---------------
vlc (1.1.10-1ubuntu1) oneiric; urgency=low

  * Merge from Debian unstable, remaining changes:
    - build and install the libx264 plugin

vlc (1.1.10-1) unstable; urgency=high

  [ Benjamin Drung ]
  * New upstream release.
    - Security: Fix XSPF integer overflow (CVE-2011-2194) (LP: #795410)
    - Improve .desktop file:
      - Add smb as supported protocol (Closes: #622879, LP: #737192)
      - add video/webm to supported MIME formats (LP: #769463)
    - Fix libdvdread errors while playing ogg files (Closes: #622935)
    - Support three channels in pulseaudio output plugin (LP: 743478)
    - PulseAudio output re-written due to unstability of the current one
      (LP: #743323)
    - Fix crashes (LP: #754497, #785979)
    - Qt: allow drag and drop of any URL, not just a local file (LP: #664030)
    - Fix libvlcplugin.so: undefined symbol: NPP_Initialize (LP: #722690)
  * Refresh patches.
  * Drop as-needed patch due to autoreconf run.
  * Backport PulseAudio build fix.
  * Add GNOME MIME types for Ogg Vorbis and Ogg Theora (Closes: #629619).
  * Mention potcast support in package description (Closes: #488771).

  [ Reinhard Tartler ]
  * run autoreconf on the buildds
  * Weaken dependencies on libschroedinger
 -- Benjamin Drung <email address hidden> Sat, 11 Jun 2011 19:56:27 +0200

but i didn't find package vlc - 1.1.10-1ubuntu1 in update manager. How do I update my VLC to 1.1.10??

Thanks!!
Danny

Look at the current statuses of this bug:
VLC: Fix released
Ubuntu: Fix released
Natty: New

This means, the bug is fixed in upstream VLC source code and in Ubuntu development version, and not handled (yet) in Natty.

Wait, until vlc 1.1.9-1ubuntu1.2 is available in natty-proposed.

Accepted vlc into natty-proposed, the package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

I would like to test the package, but I am running Kubuntu. What do I need to add (as far as pin-priorities, etc) to /etc/apt/preferences if I am also using the following?
1) regular Ubuntu backports
2) Kubuntu updates
3) Kubuntu backports

Perhaps, an additional example for Kubuntu people should be added to https://wiki.ubuntu.com/Testing/EnableProposed

There is no difference between Kubuntu and Ubuntu, because the archive is the same. You just have different packages installed. Add following line to /etc/apt/sources.list:

deb http://archive.ubuntu.com/ubuntu/ natty-proposed restricted main multiverse universe

I tested vlc plugin 1.1.9-1ubuntu1.2 with Firefox 5. All test videos played without exposing any warnings on the terminal.

This bug was fixed in the package vlc - 1.1.9-1ubuntu1.2

---------------
vlc (1.1.9-1ubuntu1.2) natty-proposed; urgency=low

  * Backport PulseAudio output plugin rewrite to fix memory leak. (LP: #743323)
  * ASX: fix NULL derefence (LP: #785979)
  * Qt: undo the FSC/KDE workaround (LP: #774581)
  * Add Firefox 4 compatibility (LP: #722690)
 -- Benjamin Drung <email address hidden> Tue, 14 Jun 2011 03:04:10 +0200

why solution a have package in solution ..... what i checklist in my synaptic package manager or how solution

Heru, I don't understand, what you want to say or ask.

If you want to know, when vlc 1.1.9-1ubuntu1.2 shows up in your (Synaptic) package manager, the answer is in a few hours. The package needs some hours until it is synced from the primary archive to your local mirror.