CVD? is it an actual cd-r, or a disc made in china?

[jedi]

hey guys im sorry ,but i read the what is CVD, but i really dont understand. is it a cd-r with different standards? or is it a completely different type of disc? thanks

[offline]

A mpeg-2 file encoded at 352x(480/576 NTSC/PAL)
at bitrates equal or near equal to SVCD, usually 48Hkz sound, burned
on a normal cdr or cdrw cd as a SVCD. Can also be burned as a
header changed VCD mpeg video or on a DVD rom disc as a half
res. DVD program stream.

See SatStorm's excellent guide @ this site.

[jedi]

thanks for the info but what do u mean "Can also be burned as a
header changed VCD mpeg video " how would this be accomplished?
if its burned like that, would it be supported by many dvd players?

[jedi]

and i checked the "how to's" and cant find sat storms guide anywhere. so if your player plays SVCD, does that mean it can play CVD? what about if it only can play VCd and XVCD, will it play CVD?

[deadpac]

what do u mean "Can also be burned as a
header changed VCD mpeg video " how would this be accomplished?
if its burned like that, would it be supported by many dvd players?

That is where you demux the CVD stream and then when you multiplex the streams back together, but instead of using an SVCD header you use a VCD header. A cheap trick that works on some DVD players that don't support MPEG2 streams from CD-R. The Player thinks it's reading a VCD stream when in actuality it is reading an MPEG2 stream. I've tried this on two of my mis-bought Panasonics and SVCD & CVD's with 44000hz audio streams only worked, and not 48000hz streams.

is it a cd-r with different standards? or is it a completely different type of disc? thanks

CVD stands for a half resolution DVD stream burned onto a REGULAR cd-r disc that's what the "C" in VD stands for, not sure completely though. If you took a CVD stream and authored & burned it onto a DVD-R/+R/+RW+R...... as a DVD then it would be called a DVD.

CVD stream on CD-R media = CVD
CVD stream on DVD media = DVD

[MOVIEGEEK]

hey guys im sorry ,but i read the what is CVD, but i really dont understand. is it a cd-r with different standards? or is it a completely different type of disc? thanks

Making a CVD disk is wise if you don't have a DVD writer but plan to in
the future.CVD is not true DVD res. it is 1/2 D.

[adam]

CVD's don't use 48kHz sound, many people simply use this since it allows your disk to be future dvd compatible. If you use 48kHz, however, than your disk complies to no standard and playback will not be guaranteed.

There were three formats in competition in China, HQ_VCD, CVD, and SVCD. They were all virtually identical except with some minor variations. CVD is identical to SVCD except that it uses a resolution of 352x480/576 instead of 480x480/576. SVCD obviously beat out the other competition but HQ_VCD and CVD are still recognized standards with hardware support.

All R2 players that can play SVCD are required to also play VCD, HQ_VCD, and SVCD. This is for certain.

I am also quite certain that all Svcd compatible R1 players are also required to play CVDS and HQ_VCDS. If you look at the history of
C-Cube (creator of CVD) its pretty clear why. Also I have tested CVD's on every SVCD compatible dvd player I could find (several hundred) and not a single one had any problems. Those reported people who are experiencing problems with CVD's on R1 players must be doing something wrong.

If your dvd player supports SVCD's then it should play CVD's and it will definitely play VCDS.

If your player does not support SVCDS then it will not support CVD's.

[jedi]

what if it supports XVCD? or what if it can play SVCD but with the vcd header trick?

[vitualis]

As what adam stated.

People have seemed to become mislead on what CVD actually is. It is not putting half resolution DVD video onto CD-R.

CVD is a video disc standard just like VCD or SVCD -- very similar in fact. Apart from the difference in framesize (352x480/576 as opposed to 480x480/576) most other specs are IDENTICAL. There are only a few minor variations in terms of file/directory naming and a number of tags (and the OGT format as well).

CVD do not use audio at 48 kHz. Furthermore, it is limited to a max. combined bitrate of less than 2 spin CD as well (just like SVCD).

BTW, the "C" standards for "China" -- CVD = China video disc.

This was the standard proposed by C-Cube (the main manufacter of MPEG decoders in China and probably the company that pushed VCDs from being a fringe irrelevant standard to being the main form of video format played in Asia) as the follow up to VCD. SVCD was eventually chosen as the follow-up format but as C-Cube had already started shipping "CVD" playback units, the new SVCD format had to be fully compatible with CVD.

Read the VCDImager manual for more info.

Regards.

[adam]

what if it supports XVCD? or what if it can play SVCD but with the vcd header trick?

First off no player simply "supports XVCD." Many players can still play disks with various non standard settings but there is always a limit to how far off spec you can go.

XVCD has no relation to SVCD or CVD, as far compatibility is concerned. If your dvd player supports off spec vcds it may or may not support SVCD or CVD. There is no way to know without trying it for yourself.

Like I said, for the most part, the only difference between CVD and SVCD is the resolution. If your dvd player supports a SVCD multiplexed as a VCD then it should also work for a CVD multiplexed as a VCD, but since you are making a non-standard disk nothing is guaranteed. Again the only way to know for sure what your dvd player supports is to just try it out. All I can say is that if your dvd player supports SVCD's then it should support CVD's also.

[offline]

CVD has evolved into a type of XVCD which is why I felt comfortable
in saying that it i"usually" is recorded with sound at 48.1Hkz - which is
of course correct but not to standard, as is the recording to DVD etc.

By the way does someone here know the actual HQVCD specs? I know
the bitrate is 4000 but what is the frame size?

[jedi]

thanks for all the info guys. so i mean is there like a template for it? or do i just change the settings in tmpeg to the resolution i want? also when burning, what do i select? VCD or SVCD? i dont see an option for CVD.

[SatStorm]

@offline: CVD is a standard format for optical media. A forgoten one, but still a standard format. Also, it is mpeg 2, not mpeg 1, that means it isn't evolved into a type of XVCD or anything. xVCD is a term to describe VCD extensions. Some well know xVCDs, are SeVCD from Sefy, KVCD from Kwag and CVCD from VCDspain. (x)VCD is based on mpeg 1. CVD is mpeg 2 like SVCD and DVD. So, you could say that CVD is a XSVCD or the opossite: SVCD is xCVD!

@jedi: Not yet, I testing some stuff and I promise to publish one, but only for PAL which I am familiar with. Untill then, load the SVCD template, unlock and set in the output resolution to 352X576/480. You have CVD that way.
Then, burn to Nero, as non standard SVCD.

[offline]

@ Satstorm

I respect your posts but here I think you and some of the others are being a little pedantic - no offense intended.

Not a single CVD was ever manufactured for the public. At best
it was a suggested standard. That some standalone VCD recorders adopted that suggestion and called it SVCD (incorrectly) still does not
give it the status some here would like to imagine. I like to think
CVD as a standard but when pushed I have to point out that as a
commercial standard (i.e. real) it does not exist.

I realise that CVD is not mpeg-1. I never said it was.
I answered the original poster covering as
many aspects as possible including the common practice of 1) recording audio at 48Hkz and 2) rewriting the mpeg-2 stream header to make the
disc more compatable with their dvd players. The XVCD bit was a typo. It should have read SxVCD.

[SatStorm]

@ Offline:
No, you are wrong! There was (and still is) CVD movies in china. Also more than 1 CVD million players sold between summer 1997-1998! That was the reason the China goverment involved into the proccess....

I have one original CVD disc, that was the reason I start digging for the format! It is a 2 episode CVD of the old anime Candy Candy!
There are also some CVD recorders avalaible and still produced!
http://www.amoisonic.gr/greek/VDR2000.htm gonna show you one of them!
(Try also: http://www.amoisonic.gr/english/VDR2000.htm)
I have test myself this machine for a long time, and analysing the produced files help me a lot understanding any parameter of CVD in praxis.

[offline]

@SatStorm

Ok I believe you ..but I was there in the winter of 1998 and
I could not find a single unit. All were hybrid VCD playes that
played various "VCD Super formats" and disc's were labled
SuperVCD or VCD. No CVD. Some of the SuperVCD discs
were at 352x480.

Is your "CVD" disk a real live CVD or
just a SVCD variant - as there were quite a few of those
for sale under 2 yuan back then.

BTW 1 million sales in China is nothing. The stereo system
with the smallest market share in 1999 sold 2.5 million
units in 6 months.

[adam]

CVD has evolved into a type of XVCD which is why I felt comfortable
in saying that it i"usually" is recorded with sound at 48.1Hkz - which is
of course correct but not to standard, as is the recording to DVD etc.

By the way does someone here know the actual HQVCD specs? I know
the bitrate is 4000 but what is the frame size?

CVD is definitely a set standard and support for it is still being required in all Super VCD compatible dvd players. I don't understand how a standard can evolve without the specs being modified as well. What you do with the format is up to you but its settings are defined by the specs and if you go outside of those specs you are no longer making a CVD.

HQ-VCD does not use 4000kbits. Remember CVD, HQ-VCD, and SVCD were all based on the capabilities of 2x drives so they all have the exact same bitrate limit, ~2.6kbits video, ~2.778kbits total (audio + video.)

HQ-VCD is only a slight variation of the SVCD standard done for compatibility purposes. It is virtually identical to the SVCD standard except that the scandata.dat is mandatory instead of being optional and the search.dat is optional instead of being mandatory.

[SatStorm]

@ offline: I bought that disc a year or more ago. It is all chinese and there are some chinese letters followed by CVD. There are 2 episodes (20min 30 sec each, total 41min) with excellent quality/audio! Then, on VCDhelp, I read users reporting stuff like chao-ji VCD, 352 X 576/480 and stuff. Then I did a little dig and I end up searching old chinese online newspapers! There were all there...

Yes, 1 million ain't much for china, but the whole CVD thing was less than 8 months! And also, VCD/SVCD/CVD players after mid 99, simply stop selling! DVDs rise real fast there too!

At the end of 1999, you could see many strange things in China. For example that CVCD story. It was a X VCD on a 99min CD-R! Then, some spanish guys "discover" it and start use it in spain and many other European countries! Sefy's SeVCD is almost identical...
The whole VCD/CVD/SVCD story is a great mess... If you dig in the story, you gonna see many formats and names for the same things. For example, Amoisonic refers always to SVCD as... SVD. Why? Because basicly, it use CVDx1 (the enchanced version) and not true SVCDs!
The good news, are that we have many alternatives to play for, without even really know them!

[vhelp]

morning jedi,

in reference to post below this. . .

Sorry, my mistake, ...was answered in 2nd post.

-vhelp

[jedi]

vhelp, FOR THE LAST TIME?? i asked once, and got the answer in the 2nd post.