diff options
Diffstat (limited to 'DOCS')
| -rw-r--r-- | DOCS/xml/en/cd-dvd.xml | 41 |
1 files changed, 31 insertions, 10 deletions
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 <application>MPlayer</application>. <formalpara> <title>VCD structure</title> -<para>VCD disks consist of one or more tracks:</para> + +<para> +A Video CD (VCD) is made up of CD-ROM XA sectors, i.e. CD-ROM mode 2 +form 1 and 2 tracks:</para> </formalpara> <itemizedlist> <listitem><para> -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. </para></listitem> <listitem><para> -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 <emphasis role="bold">cannot -be mounted</emphasis> (Did you ever mount an audio CD to play it?). -As most movies are inside this track, you should try <option>vcd://2</option> first. -</para></listitem> +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 +<emphasis role="bold">cannot be mounted</emphasis>. As most movies are +inside this kind of track, you should try <option>vcd://2</option> +first.</para></listitem> <listitem><para> There exist VCD disks without the first track (single track and no filesystem at all). They are still playable, but cannot be mounted. </para></listitem> + +<listitem><para> 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 +<ulink url="http://www.vcdimager.org/pub/vcdimager/manuals/0.7/vcdimager.html#SEC4">vcdimager documentation</ulink>. +</para></listitem> + </itemizedlist> <formalpara> |