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| Technical Info for VCD |
PAL Video: |
NTSC/NTSC Film Video: 1150 kbit/sec MPEG-1 352 x 240 pixels 29,97 frames/second 23,976 frames/second NTSC Film Audio: 44100 Hz 224 kbit/sec MPEG-1 Layer2 Extra: Menus and chapters Still pictures in 704x480,352x240 |
and even more technical details about VCD 1.1 and VCD 2.0:
Video CD 1.1
This is the most basic Video CD specification dating back to 1993 4 , which has the followingcharacteristics:
? One mode 2 mixed form ISO-9660 track containing file pointers to the information areas.
? Up to 98 multiplex-ed mpeg-1 audio/video streams or cd-da audio tracks.
? Up to 500 mpeg sequence entry points used as chapter divisions.
The Video CD specification requires the multiplex-ed mpeg-1 stream to have a cbr of less than 174300 bytes (1394400 bits) per second 5 in order to accommodate single speed cd-rom drives. The specification allows for the following two resolutions 6 :
? 352 x 240 @ 29.97 Hz (ntsc sif).
? 352 x 240 @ 23.976 Hz (film sif).
The cbr mpeg-1, layer II audio stream is fixed at 224 kbps with 1 stereo or 2 mono channels.It is recommended to keep the video bit-rate under 1151929.1 bps 7.
Video CD 2.0
About two years after the Video CD 1.1 specification came out, an improved Video CD 2.0 standard was published in 1995. This one added the following items to the features already available in the Video CD 1.1 specification:
? Support for mpeg segment play items (SPI ), consisting of still pictures, motion pictures and/or audio (only) streams was added. See Section 1.6.2 [Segment Items], page 9.
? Support for interactive playback control (PBC) was added.
? Support for playing related access by providing a scan point index file was added.(бо/EXT/SCANDATA.DAT')
? Support for closed captions.
? Support for mixing ntsc and pal content.
By adding PAL support to the Video CD 1.1 specification, the following resolutions became
available:
? 352 x 240 @ 29.97 Hz (ntsc sif).
? 352 x 240 @ 23.976 Hz (film sif).
? 352 x 288 @ 25 Hz (pal sif).
For segment play items the following audio encodings became available:
? Joint stereo, stereo or dual channel audio streams at 128, 192, 224 or 384 kbit/sec bit-rate.
? Mono audio streams at 64, 96 or 192 kbit/sec bit-rate.
What is SVCD
SVCD stands for "Super VideoCD". A SVCD is very similiar to a VCD, it has the capacity to hold about 35-60 minutes on 74/80 min CDs of very good quality full-motion video along with up to 2 stereo audio tracks and also 4 selectable subtitles . A SVCD can be played on many standalone DVD Players and of course on all computers with a DVD-ROM or CD-ROM drive with the help of a software based decoder / player. It is also possible to use menus and chapters, similiar to DVDs, on a SVCD and also simple photo album/slide shows with background audio. The quality of a SVCD is much better than a VCD, especially much more sharpen picture than a VCD because of the higher resolution. But the quality depends how many minutes you choose to store on a CD, less minutes/CD generally means higher quality.
| Technical Info for SVCD |
PAL Video: |
NTSC (NTSC Film) Video: |
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Mbps = million bits per second *2 approximately resolution, it can be higher or lower ~ approximately bitrate, it can be higher or lower a DVD with lower video quality, similiar to VCD/SVCD video quality * the video quality depends on the bitrate and the video resolution, higher bitrate and higher resolution generally means better video quality but bigger file size
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