VideoLAN Wiki - User contributions [en]

Theora

2006-07-08T21:45:24Z

Feld: Thora -> Theora

'''Theora''' is an open video codec based on [[On2]]'s [[VP3]] codec, open sourced in 2001. It's being developed by the [http://www.xiph.org/ Xiph.org foundation] of [[Ogg]] and [[Vorbis]] fame. If you want to be sure there are no legal issues with your software, Theora is a good choice, altough it's technically not as advanced as [[MPEG-4]] or [[WMV9]].

The codec is still (as of August 2005) in alpha, but the video format has been frozen so it's safe to produce Theora files for future use. Encoding performance is still poor, so it might not be a good choice for high volume applications.

Theora uses the [[Ogg]] container format and is usually combined with [[Vorbis]] audio.

Theora files can be streamed using the [[Icecast]] 2 streaming server, available for most recent Linux distributions.

VideoLAN ships Theora support. There are also builtin support or plugins for other media players such as [[Xine]], [[MPlayer]], [[Helix Player]] and [[Windows Media Player]]. See the [http://www.theora.org/theorafaq.html Theora FAQ] for more info.

== Links ==
* [http://theora.org/ Offical website]
* [http://icecast.org/ Icecast] streaming server
* [http://www.illiminable.com/ogg/ Ogg Direct Show Filters] lets you play Theora files in many Microsoft Windows applications, including Windows Media Player.

Talk:VLC HowTo/Use a capture card

2006-07-04T23:10:50Z

Feld: requesting assistance

I'm having a problem using a capture device; the details can be found on [[User:Feld|my user page]]. -- [[User:Feld|Feld]] 01:10, 5 July 2006 (CEST)

User:Feld

2006-07-04T22:54:49Z

Feld: More specific about what the problem I can't solve is

Hi, my name is Feld.

== Problem: Cannot keep settings for capture device ==

I am using version 0.8.5 of VLC with the wxWindows interface. The computer/OS is an Athlon 64 running Windows XP Home. The capture device is a CompUSA "High Speed USB Video Grabber" which according to the drivers and to VLC is a "USB 2820 device".

My problem is that the capture device appears to output in a strange aspect ratio. (The software that came with the device, ULead Video Studio 7 SE Basic, appears to be capturing from the device in a 950x480 aspect.)

I have found how to get normal-aspect video to play on the screen:
#''File''->''Open Capture Device''
#:I get the ''Open'' dialog, on the ''DirectShow'' tab.
#Press the ''Refresh list'' button across from ''Video device name''
#:In a few moments, "USB 2820 Device" appears.
#Select ''USB 2820 Device''
#Press ''Advanced options'' button
#:Get ''Advanced options (DirectShow input)'' dialog
#Check ''Device properties'' checkbox
#Click ''OK'' on ''Advanced options (DirectShow input)'' dialog
#Click ''OK'' on ''Open'' dialog
#:Get ''Properties'' dialog with tabs ''Video Decoder'', ''Video Proc Amp'', and ''Video Image'' tabs. On ''Video Decoder'' tab:
#:*''Video Standard'' is set to "NTSC_M"
#:* ''Signal Detected'' is 1
#:* ''Lines detected'' is 525
#:* ''VCR Input'' is unchecked.
#Click ''OK'' on ''Properties'' dialog with ''Video Decoder'', ''Video Proc Amp'', and ''Video Image'' tabs.
#:Get ''Properties'' dialog with single ''Stream Format'' tab. Panes are ''Video Format'' and ''Compression''; on ''Video Format'' pane:
#:* ''Video Standard'' is set to "NTSC_M" (unchangable here)
#:* ''Frame Rate'' is "30.000"
#:* ''Flip Horizontal'' is greyed out
#:* ''Color Space / Compression'' is set to ''I420''
#:* ''Output Size'' says the default is "640x480" but is always "352x240" when this dialog first appears.
#Click ''Apply'' and ''OK''
#:Get ''Properties'' dialog with single ''Crossbar'' tab. Panes are ''Input'' and ''Output''.
#Click ''OK''.
#:Video from capture device now appears on screen in a normal aspect ratio.

This works to get video onto the screen, but I would like to use VLC to save the video I'm capturing to file. I can't seem to do this, because if I try to set up a transcoding chain with the input from the capture device, I have no way of changing the Output Size to the 640x480 it should be.

User:Feld

2006-07-04T22:44:39Z

Feld: Start user page with a description of my USB 2820 device problem