View source for OldFAQ

{{stub}}
Answers to some common problems people encounter with VLC. More help is available in the
* [http://www.videolan.org/doc/ Documentation]
* [http://www.videolan.org/doc/faq/en/videolan-faq-en.html FAQ]
* [[Forum]]
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== Installing VLC ==

=== On Mac OS 9 ===

{{faqlink|239006}}
* Sorry, VLC will not work on OS 9, and probably never will. However, Mac OS X is supported - [[Unsupported|Find out Why]]

=== Compiling VLC ===

==== How do I compile VLC? ====

* Look at [http://developers.videolan.org/vlc/ how to compile VLC]. There are pre-compiled (binary / executable) versions [http://www.videolan.org/vlc/ here].

==== Mozilla Firefox Plugin ====

* ''Debian:'' All you need is to download the vlc plugin package - mozilla-plugin-vlc ([http://packages.debian.org/stable/graphics/mozilla-plugin-vlc stable release])
* ''All Linux:'' To make the firefox plugin with the vlc player, you will first need the Firefox Development package (from: [http://packages.ubuntu.com/breezy/devel/firefox-dev ubuntu] ...). Then, when you compile, run ./configure with --enable-mozilla, and if needed with --with-mozilla-sdk-path=''/path_to_firefox_sdk''

==== "Missing header file ffmpeg/avcodec.h" and "Missing header file postproc/postprocess.h" Errors ====

* Make sure that you have all the libraries you need.
** '''on ubuntu''': "apt-get install libavcodec-dev libpostproc-dev" will install the needed files (worked on edgy).
* When you run ./configure for [[ffmpeg]], make sure that at least the following flags are set (descriptions of these avaliable from ./configure --help )
 ./configure --enable-shared --enable-shared-pp --enable-pp --enable-gpl
* The path of ffmpeg is not set. Check if you can locate the file '''libavcodec.pc''' on your computer, and export PKG_CONFIG_PATH to where you found it before running ./configure. For example
 export PKG_CONFIG_PATH=/home/you/ffmpeg/

With vlc-086f, FFmpeg SVN-r13060, on Slamd64 12.0.0, some other changes must be made.  These are most likely due to changes in libpostproc.

The ./configure flags for ffmpeg become
  ./configure --enable-postproc --enable-shared --enable-gpl

Then you must set a symbolic link for postproc.  This took me a long time to spot.

 root @ svr (/usr/src/vlc-0.8.6f)locate postprocess.h
 /usr/local/include/libpostproc/postprocess.h
 root @ svr (/usr/src/vlc-0.8.6f)cd /usr/local/include/
 root @ svr (/usr/local/include)ln -s libpostproc postproc

==== "cc1: error: invalid option `tune=opteron'" Error on 64-bit systems ====

* One user writes: "From what I can see, the -mtune flag is not available for this type of processor in man gcc. I had to change the configure options comment out all the lines where they set mcpu or mtune flags.) I don't know if this is the correct way to proceed but was the only way for me to get results fast."

* This is not true on all versions of gcc.  Try to compile on your platform before making the above changes.

 root @ p01 (/usr/src/vlc-0.8.6f)gcc --version
 gcc (GCC) 4.1.2

 root @ p01 (/usr/src/vlc-0.8.6f)uname -a
 Linux p01 2.6.24.3 #2 SMP Tue Apr 8 12:01:03 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux

 root @ p01 (/usr/src/vlc-0.8.6f)grep tune= config.log
 configure:37114: checking whether gcc accepts -mtune=athlon64
 configure:37125: gcc -c -Wsign-compare -Wall  -pipe -mtune=athlon64  -DSYS_LINUX conftest.c >&5

 root @ p01 (/usr/src/vlc-0.8.6f)grep cpu= config.log
 build_cpu='x86_64'
 host_cpu='x86_64'
 target_cpu='x86_64'

==== "/usr/bin/ld: cannot find -lX11" Error on 64-bit systems ====

* In configure, there is an x_libraries variable there that is set to "/usr/X11R6/lib" (around line 16371). Because it is a 64 bit system, this variable needs to be /usr/X11R6/lib64. After changing that, it should continue compiling.

==== "syntax error before "pthread_spinlock_t"" on debian-Etch or CentOS ====

* If you have errors about ''pthread_spin*'' in the file ''vlc_threads_funcs.h'', try this fix :
 su
 sed -e 's/define\s*_POSIX_SPIN_LOCKS\s*/define _POSIX_SPIN_LOCKS -1 \/\/ wrong: /g' -i /usr/include/bits/posix_opt.h
 exit
source : [http://forum.videolan.org/viewtopic.php?f=13&t=43930#p139570 this post] from Rémi Denis-Courmont.

=== Installing Skins ===

* Although all information is given on the [http://www.videolan.org/vlc/skins.php VLC Download skin site], you may miss the note to change preferences to ''skinnable interface''. There is an [http://forum.videolan.org/viewtopic.php?p=85603#p85603 article on the forum] which describes the how-to. In short: there is a drop-down option (interface module) in the settings dialog (Interface &rarr; General) which defaults to ''Standard''. Change this and restart.

== Problems Starting VLC ==

=== VLC does not launch on my Mac anymore. What to do? ===

* Please have a look at the [[FAQ_on_MacOSX_only_issues|specific FAQ]], which covers multiple solutions to this issue.

== Error Messages ==

Error messages can be viewed by selecting Messages from the View menu.

=== main private error: no sout mux module matched "ts" ===

* This can be an error if '''libdvbpsi''' was not installed when vlc was compiled. To fix this error, install libdvbpsi; then re-compile vlc. [http://developers.videolan.org/libdvbpsi/ libdvbpsi]

=== main dialogs provider error: no dialogs provider module matched "any" ===

* The solution is found in [http://forum.videolan.org/viewtopic.php?t=14733 the forum]


== Problems playing types of files ==

=== WMV files ===

* Starting with VLC media player 0.8.6, the playback of WMV3-encoded videos is available on all platforms. Please note, that encrypted / DRM-protected video-clips still cannot be played. That is due to the nature of DRM and is not about to change, so please do not ask.

=== Real Media files ===

* Realmedia files (.rm, .rpm, etc) are proprietary (ie, copyrighted) file formats, created by RealNetworks. Because of this, VLC can't support them at present.

=== QuickTime Files (.mov) ===

* Mov file doesn't play, but plays ok in QuickTime
** open the url in QuickTime player
** let it decide which datarate is best for your connection
** let it play for a few seconds, then pause it
** open the stream info, copy the url
** open & save that one in VLC

=== Flash Video Files (.flv) ===

* Flash Video support has recently been added (provided through ffmpeg) - to view .flv files you will need version 0.8.4a. Download and install the latest version [http://www.videolan.org/vlc/ here].
* VLC still has problems with a few .flv files. If you have problems playing a file in VLC you might be able to change it to an avi using [[ffmpeg]]. See [[Fixing .flv to .avi with Ffmpeg]].
* VLC 0.8.6 provided enhanced Flash Video support on all platforms, so it is probably worth to update if you experience problems with prior releases.

=== Other Files ===

{{faqlink|238663}}
* Make sure that VLC supports that file - look at the [http://www.videolan.org/vlc/features.html list of supposted formats]

* Make sure that the file isn't corrupted

== VLC and Other Programs ==

=== AMR ===

* To use [http://en.wikipedia.org/wiki/Adaptive_Multi-Rate AMR], you'll need to compile vlc and ffmpeg with amr support yourself. This is because the amr license is not compatible with the vlc license.

=== ratDVD ===

* VLC does not support [http://en.wikipedia.org/wiki/RatDVD ratDVD] and is not going to be, both for political and technical reasons.

== Problems Playing DVDs ==

===Unable to play any DVDs===

{{faqlink|239006}}
* ''Linux:'' To play DVDs with VLC in linux, you need to install the libdvdcss package
* ''Linux:'' Make sure you have access rigths to your DVD player. In linux, you can use chmod to edit access rights to your DVD block device:
** <nowiki>#</nowiki> chmod 666 /dev/dvd
** The videolan FAQ seems to suggest you need write access to this device - is this true? If you know, please edit this entry.
* ''Linux:'' Make sure VLC knows where your DVD drive is located (/dev/dvd usually).  Go to Settings | Preferences | Input/Codecs | General and under "Default devices" make sure your dvd drive path is entered in the "Default DVD" box.  When you go to open a DVD, you should see something like "dvd:///dev/dvd" as the [[media resource locator]] in the "Open:" box near the top of the Open dialog.

=== Playing DVDs from other Region Codes ===

{{faqlink|239426}}
* The ability to play DVDs from all regions depends mostly on your DVD drive, and testing it is usually the quickest way to find out if your DVD drive can do it. Most newer DVD drives are RPC2 drives, which don't allow raw access to the drive untill the drive firmware has done a regioncheck. VLC uses libdvdcss and it needs raw access to the DVD drive to crack the encryption key. So with these drives it is impossible to circumvent the region protection. (This goes for all software. You will need to flash your drives firmware, but sometimes there is no alternate firmware available for your drive). On other RPC2 drives that DO allow raw access, it might take VLC a long time to crack the key. So just pop the disc in your drive and try it out, while you get a coffee. RPC1 drives should 'always' work regardless of the regioncode.


== Poor Quality Video and Audio ==

=== The video runs but the picture is distorted ===

{{faqlink|238431}}
* ''Linux:'' There is probably a problem with the output layer. There are several ways of troubleshooting it.
** First, try with another output plugin, for instance:
**: % vlc -V sdl
**: % vlc -V x11
** Second, change your screen depth and/or definition. It quite often helps.
** Lastly, if running Unix, have a look at your XFree86 video driver. 

=== Video is choppy ===

{{faqlink|238474}}
* Your system may be too slow to decode all pictures. Sometimes, your CPU (computer) really isn't fast enough, but often the situation can be improved by changing your system configuration to be a bit kinder to VLC.
** Quit other programs running in the background
** Turn on DMA on your DVD device:
*** ''Linux:''
***: <nowiki>#</nowiki> hdparm -d1 /dev/dvd
*** ''Windows:'' go to the System section of the control panel, and go to the Hardware manager (it is sometimes in a separate tab, and sometimes, you have to go to the Advanced tab. Then, right-click on your DVD player, and check the DMA checkbox. 
** Upgrade to the latest driver for your video board.
** ''Linux:'' you can additionally upgrade your drivers to the latest XFree86 version. If supported, check that the xvideo plug-in is effectively used with:
**: % vlc -vvvv

=== Audio and video are out of sync ===

{{faqlink|238571}}
* If you are [[transcoding]] a file, use the [[audio-sync]] option.
* You can manually set the audio offset while playing (so you can put the audio back in sync). The default keys to increase/decrease the offset are Ctrl+K and Ctrl+L in Windows, and f and g in Mac.
* ''Linux/Unix:'' Try using another audio output plugin and, under Unix, kill esd or artsd if they are running. If the problem is due to the input file, have a look at the "Audio desynchronization compensation" option.

== Problems with Streaming ==

==="main input error: no suitable access module for `rtsp://...'"===

vlc needs livemedia from '''live555.com''' to read rtsp stream this way. 

You can check you have it by :

   vlc -l | grep live

It should read

  livedotcom            live.com (RTSP/RTP/SDP) demuxer
  livedotcom            RTSP/RTP access and demux

If not, you have to install '''livemedia''' and point your compilation to this lib directory :

   ./configure '''--enable-livedotcom --with-livedotcom-tree=/usr/local/lib/live/'''


===Streaming playlist continuously between files (sout-keep not working)===

you should add gather-module sout-chain, example
    vlc *mpeg --sout-keep --sout '#gather:transcode{plapla}:rtp{plapla}'

===Streaming 1 playlist item continuously and change input without stream break===

you can use this kinda vlm.conf file and --sout-keep option
  new output1 broadcast enabled loop
  setup output1 input "inputfile1.mpeg"
  setup output1 input "inputfile2.mpeg"
  setup output1 input "/path/to/inputfile3.mpeg"
  setup output1 option sout-keep
  setup output1 option input-repeat=-1
  setup output1 output #gather:transcode{etc...}:std{plapal}
 
  control output1 play 2

you then chan telnet into vlm and just command
  control output1 play <playlistnumber>
to change streamed input.

===Streaming to Windows Media Player===

See [[Windows Media Player]] for details.

== Problems converting between file formats (transcoding) ==

=== Missing Audio and/or Video ===

* Certain containers (aka muxers) can only hold certain types of video and audio - look at [http://www.videolan.org/streaming/features.html Streaming features]

== Streaming/Transcoding Wizard ==



=== Transcode / Save to file ===


* Partial Extract "From" "To" does not work, allone "To" don´t too.
: I've tested it too with the 0.8.6c version, already specifying the time data in seconds, and this parameter has no effect.

== VLC Crashes ==

=== General ===

{{faqlink|238592}}
* If VLC crashes, the following steps will help determine the cause.
** Increase the verbosity level (either in the preferences or with a -vvvv command line option) and look at the debug messages (in the terminal or in the Messages window).
* If you are convinced that it is a bug in VLC, have a look at the [http://www.videolan.org/support/bug-reporting.html bug reporting page].

=== When using DirectShow (eg Webcam) ===

{{forum|12394}}
* There was a bug a while back when you tried to stream using a directshow/webcam it would reboot the computer. The fix was to specify the resolution on the command line or in the "Advanced" section when opening the directshow.


== Other Problems ==

=== I only want one VLC player! ===

* To use the same VLC player for all the media files, go to Settings, Preferences, Advanced. The following options should give behavior similar to WMP: minimize # of threads, allow only one running instance, VLC is started from file association, allow only "on" running instance when started from file (typo in v0.8.5).

=== Licensing, legal issues and logo use ===

* Information on this is avaliable on the main videolan website, [http://videolan.org videolan.org]. Also read the [http://www.videolan.org/doc/faq/en/index.html#id238663 Legal concerns] section of the [http://www.videolan.org/doc/faq/en/index.html FAQ].
* This is a wiki site: it is editable by all, so it is best to check to official website.

=== Fixing Strange Behaviour ===

{{faqlink|238992}}
* The first thing to do is to reset the VLC preferences in the preferences dialog of the application and restart VLC. If VLC doesn't even start anymore, delete VLC's configuration file ([[#Configuration File|where is it?]]). Then restart VLC. If it does not get any better, read the rest of this page or FAQ page, or ask for help at the [[forum]].

=== Subtitles Problem ===

* In the File | Open File dialog, select "Use a subtitles file", and enter both the video's filename and the video's subtitle filename.
* If you are having displaying the subtitles, the problem might be an encoding problem. Choose the right encoding for your language and it should fix your problem. You'll find the ISOs here: [http://alis.isoc.org/codage/iso8859/jeuxiso.en.htm]. Once you find a text encoding method that works well for you enter it in Preferences, Input / Codecs, Other codecs, Subtitles then press Save and restart VLC. If you have a specialized language like Hebrew, Arabic, Chinese or Japanese changing the font to a Unicode font will be helpful. For Polish subtitles choose CP 1250 ISO code.

=== No Sound on DirectShow Capture ===

* As odd as it sounds, try setting the sound device to 'none'.  See also [http://forum.videolan.org/viewtopic.php?t=2859].

=== VLC hangs when opening Matroska (mkv) files ===

* This might occur when using VLC to view an mkv file in a directory that has a large number of mkv files. (eg. in an Azureus download directory)
VLC will attempt to preload all the mkv files in the directory and will hang, especially if some mkv files are not fully downloaded yet (thus seem to be broken).
* The solution is to set the mkv option: --mkv-preload-local-dir to false
Preferences -> Input / Codecs -> Demuxers -> Matroska -> Preload Directory (uncheck the checkbox)
(See also http://wiki.videolan.org/Matroska)