From d9332a437bd94d7a624e53b1b54e5f6320aec2a0 Mon Sep 17 00:00:00 2001 From: diego Date: Tue, 14 Dec 2004 11:32:35 +0000 Subject: more details about the structure of VCDs patch by R. Bernstein git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@14154 b3059339-0415-0410-9bf9-f77b7e298cf2 --- DOCS/xml/en/cd-dvd.xml | 41 +++++++++++++++++++++++++++++++---------- 1 file changed, 31 insertions(+), 10 deletions(-) (limited to 'DOCS') diff --git a/DOCS/xml/en/cd-dvd.xml b/DOCS/xml/en/cd-dvd.xml index e18c9bb59e..480ff09312 100644 --- a/DOCS/xml/en/cd-dvd.xml +++ b/DOCS/xml/en/cd-dvd.xml @@ -274,28 +274,49 @@ and play the resulting file with MPlayer. VCD structure -VCD disks consist of one or more tracks: + + +A Video CD (VCD) is made up of CD-ROM XA sectors, i.e. CD-ROM mode 2 +form 1 and 2 tracks: -The first track is a small 2048 bytes/sector data track with an iso9660 -filesystem, usually containing Windows VCD player programs and maybe other -information (images, text, etc). +The first track is in mode 2 form 2 format which means it uses L2 +error correction. The track contains an ISO-9660 filesystem with 2048 +bytes/sector. This filesystem contains VCD metadata information, as +well as still frames often used in menus. MPEG segments for menus can +also be stored in this first track, but the MPEGs have to be broken up +into a series of 150-sector chunks. The ISO-9660 filesystem may +contain other files or programs that are not essential for VCD +operation. -The second and other tracks are raw 2324 bytes/sector MPEG (movie) -tracks, containing one MPEG PS data packet per sector instead of a -filesystem. Similar to audio CD tracks, these tracks cannot -be mounted (Did you ever mount an audio CD to play it?). -As most movies are inside this track, you should try first. - +The second and remaining tracks are generally raw 2324 bytes/sector +MPEG (movie) tracks, containing one MPEG PS data packet per +sector. These are in mode 2 form 1 format, so they store more data per +sector at the loss of some error correction. It is also legal to have +CD-DA tracks in a VCD after the first track as well. +On some operating systems there is some trickery that goes on to make +these non-ISO-9660 tracks appear in a filesystem. On other operating +systems like GNU/Linux this is not the case (yet). Here the MPEG data +cannot be mounted. As most movies are +inside this kind of track, you should try +first. There exist VCD disks without the first track (single track and no filesystem at all). They are still playable, but cannot be mounted. + + The definition of the Video CD standard is called the +Philips "White Book" and it is not generally available online as it +must be purchased from Philips. More detailed information about Video +CDs can be found in the +vcdimager documentation. + + -- cgit v1.2.3