libvlcplugin.so does not load libXt, needs patch (FC6)

[Wisteso]

Edit: I've renamed the topic to better suit what we (largely "mow") found out.

I've searched high and low for someone else with this problem with no luck.

When I have no multimedia handler installed for firefox, it says there's no plugin for the file. When I have VLC installed it immediately crashes ALL copies of firefox if I open a web page with content that is associated with VLC. This happens with remote or local sites, so long as the player is being loaded. There is no way to avoid the crash on a page with VLC-assigned media so long as the player is installed.

The standalone player works flawlessly and I have no other problems on my system or with firefox, this is my one and only problem. The plugin is downloaded via YUM (running Fedora Core 6) from linva RPM repositories, where I get every other RPM from so it's not the way it's compiled or from who I've gotten it from.

I've looked all over for some type of log but it seems firefox doesn't generate any, nor does videolan, and there is no error message at all... so I'm completely in the dark. I'd much rather get VLC to run than have to resort to using a lesser web media player, but everything I've tried up to this point has completely failed.

This problem has persisted for some time, through many versions (I install it every once in a while to see if it has been fixed), so even though I'm patient, I'm unable wait this one out.

If you know anything that might be helpful, please pass that info my way.

[Wisteso]

I would appreciate even a vague idea. I've exhausted every option that I know of aside from trying to fix the code myself but I only have a basic understanding of C.

I've tried using the mplayer plugin and it works fine, so I know it's just a problem with the VLC plugin. While I could use the mplayer plugin, it's somewhat unresponsive and has a terrible interface. I'd much rather use VLC.

[Wisteso]

Here's the output from running firefox under gdb with "firefox -g"

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(no debugging symbols found) <<this is when i opened the html file with the basic embed tags>> argn=type, argv=application/x-vlc-plugin argn=pluginspage, argv=http://www.videolan.org argn=version, argv=VideoLAN.VLCPlugin.2 argn=id, argv=vlc argn=height, argv=480 argn=width, argv=640 [00000001] main private debug: checking builtin modules [00000001] main private debug: checking plugin modules [00000001] main private debug: loading plugins cache file /home/Bud/.vlc/cache/plugins-04041e.dat [00000001] main private debug: recursively browsing `modules' [00000001] main private debug: recursively browsing `/usr/lib/vlc' (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [00000001] main private debug: recursively browsing `plugins' [00000001] main private debug: module bank initialized, found 236 modules [00000001] main private debug: opening config file /home/Bud/.vlc/vlcrc [00000001] main private debug: CPU has capabilities 486 586 MMX MMXEXT SSE SSE2 FPU [00000001] main private debug: looking for memcpy module: 3 candidates [00000001] main private debug: using memcpy module "memcpymmxext" [New Thread 110005136 (LWP 13136)] [00000306] main playlist debug: waiting for thread completion [00000306] main playlist debug: thread 110005136 (playlist) created at priority 0 (playlist/playlist.c:184) [New Thread 130493328 (LWP 13137)] [00000307] main private debug: waiting for thread completion [00000307] main private debug: thread 130493328 (preparser) created at priority 0 (playlist/playlist.c:210) [00000308] main interface debug: looking for interface module: 1 candidate (no debugging symbols found) [00000308] main interface debug: using interface module "hotkeys" [New Thread 145148816 (LWP 13138)] [00000308] main interface debug: thread 145148816 (interface) created at priority 0 (interface/interface.c:231) [00000310] main interface debug: looking for interface module: 1 candidate (no debugging symbols found) [00000310] main interface debug: using interface module "screensaver" [New Thread 155638672 (LWP 13139)] [00000310] main interface debug: thread 155638672 (interface) created at priority 0 (interface/interface.c:231) /usr/lib/firefox-1.5.0.9/firefox-bin: symbol lookup error: /usr/lib/mozilla/plugins/libvlcplugin.so: undefined symbol: XtWindowToWidget ---Type <return> to continue, or q <return> to quit--- Program exited with code 0177.

So the XtWindowToWidget call is causing this error, which is used by other plugins such as the flash player, but why is VLC crashing it while my flash player works fine? Hmmm...

[Wisteso]

Seems to be that it's a function of XtDisplay which is a component of X11.

Seeing as VLC is the only program on my entire machine which is running into an error with this common library, it would stand to reason that it's a bug with VLC. (perhaps not, but if it weren't I should be getting the problem from other programs or plugins)

It would be helpful to get a second opinion though...

[fatski]

No help I'm afraid, just wanted to confirm that I have exactly the same problem on firefox 1.5.0.10 FC6

[Wisteso]

Well that actually is helpful to know. It means that it's an actual problem rather than just an single user's mistake.

[Wisteso]

I would like to add though, that I am able to view sites which use this type of embedded media.

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<object data="http://localhost/test.mp3" type="audio/mpeg" height="0" width="0"> </object>

Whereas this does not...

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<embed type="application/x-vlc-plugin" pluginspage="http://www.videolan.org" </embed>

I only have VLC and flash installed so it's not due to another working program intercepting the association. The first example is the only case where mozilla-VLC works for me. The second example reproduces the bug as it appears in every other case.

[SeventhSon]

With:

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vlc.i386 0.8.6a-1.lvn6.1 installed

Firefox 1.5.0.7 and 2.0 and 2.0.0.2 crashes on viewing a page page with a video in it VLC can handle.

After

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sudo rm /usr/lib/mozilla/plugins/libvlcplugin.so

mplayerplug-in takes over and everything is fine.

Hope it is of any use.

[Wisteso]

yeah, that means it's definitely a bug. albeit a very uncommon one. the fact is that i know firefox, vlc, and xlib are all installed properly and this bug still occurs.

[Henry_Rayker]

I just wanted to say that I, too, have just experienced this bug.

I installed vlc first (as it is my preferred video player) but it crashed firefox to no end (the same XtWindowToWidget error you got), so I removed the mozilla plugin, then installed mplayer...some videos STILL didn't play. Then I saw this thread and re-added vlc but just did the

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su rm /usr/lib/mozilla/plugins/libvlcplugin.so

and now all my videos play just fine (albeit through mplayer).

I'm using F7 test2, by the way with Firefox 2.0.0.2. I'll try to check tomorrow to see if I can reproduce in Ubuntu under the same Firefox version.

[kwizart]

Could you check if the problem still occur with fedora 7
and vlc version release 8.6a-5 from livna

This release now uses ffmpeg system libs...

Please also considers that merging livna and others third part repository will break your system...(so provides yum list extras to be sure that the problem don't come from well known problems)

[mow]

I am using fc6 and last stable of vlc, here is the bug and answer;

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[root@localhost ~]# LD_PRELOAD="${LD_PRELOAD}:/usr/lib/libXt.so"; export LD_PRELOAD

It was wonderful to see rtsp stream after typing these on my firefox

[kwizart]

which vlc version do you uses ?
rpm -q vlc ?

Can you provides the output of:
ldd $(which vlc) ?

[mow]

does it matters? this is about a bug in plugin.

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[root@localhost ~]# rpm -q vlc vlc-0.8.6a-1.lvn6.1 [root@localhost ~]# ldd $(which vlc) linux-gate.so.1 => (0x00861000) libhal.so.1 => /usr/lib/libhal.so.1 (0x00457000) libdbus-1.so.3 => /lib/libdbus-1.so.3 (0x065e4000) librt.so.1 => /lib/librt.so.1 (0x00a25000) libpthread.so.0 => /lib/libpthread.so.0 (0x00651000) libdl.so.2 => /lib/libdl.so.2 (0x00622000) libdvbpsi.so.4 => /usr/lib/libdvbpsi.so.4 (0x00aa7000) libz.so.1 => /usr/lib/libz.so.1 (0x0066a000) libfaac.so.0 => /usr/lib/libfaac.so.0 (0x0097e000) libmp3lame.so.0 => /usr/lib/libmp3lame.so.0 (0x00a30000) libX11.so.6 => /usr/lib/libX11.so.6 (0x00687000) libXext.so.6 => /usr/lib/libXext.so.6 (0x0079e000) libdts.so.0 => /usr/lib/libdts.so.0 (0x00ab5000) libtheora.so.0 => /usr/lib/libtheora.so.0 (0x00ada000) libogg.so.0 => /usr/lib/libogg.so.0 (0x064f3000) libx264.so.54 => /usr/lib/libx264.so.54 (0x00991000) libm.so.6 => /lib/libm.so.6 (0x00628000) libc.so.6 => /lib/libc.so.6 (0x004e3000) libcap.so.1 => /lib/libcap.so.1 (0x004a0000) libnsl.so.1 => /lib/libnsl.so.1 (0x00473000) /lib/ld-linux.so.2 (0x004c6000) libmp4v2.so.0 => /usr/lib/libmp4v2.so.0 (0x008c1000) libXau.so.6 => /usr/lib/libXau.so.6 (0x0078b000) libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x0067f000) libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00110000) libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00790000)

[Wisteso]

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LD_PRELOAD="${LD_PRELOAD}:/usr/lib/libXt.so.6"; export LD_PRELOAD

is indeed the fix. firefox no longer crashes for me when i set that env variable before loading firefox. now i just need to merge that into the .sh file.

you think that's something firefox or vlc should be doing? im guessing VLC since other plugins use it just fine.

now I need to figure out how to get rid of this 'no video' bug, hahaha.. go figure right? but at least this problem has been diagnosed correctly now.

thanks, mow!

[kwizart]

i'm working on it...

I expect the next release 8.6b from livna will fix this This was a packaging bug indeed. because we uses old options to build mozilla-vlc with mozilla-sdk-path. This is now solved (confirms?)


This next release is supposed to fix also a compatibility with Selinux and dmo module on x86.

I'm waiting for a ffmpeg rebuild so maybe this will be avaible then...

Please fill a bug on livna http://bugzilla.livna.org/
if there is any problem with vlc on livna

Thx
Nicolas (kwizart)