CVDs

[ABC123]

I was just reading about how CVDs maybe as good or better quality as SVCDs while fitting more onto one disc. I would like to see for myself. Is there anyone out there that can list the steps and tools I would need? There doesn't seem to be any guides on doing just this unless I'm blind and couldn't see it.

[thefox149]

if your usiing tmgenc download puetorican templates in the tools section over on the left hand side......Very easy to make and you will see the difference

[adam]

Besides some very insignificant details ie: naming of files etc..., the only difference between a SVCD and a CVD is the resolution.

If you want a CVD TMPGenc template, than load the SVCD template, load the unlock template, than change the resolution from 480x480 to 352x480 for NTSC, and 480x576 to 352x576 for PAL. That's all that you must do.

If you would like to make a non-standard CVD that may later be burnt to dvd media without any further re-encoding, then on the GOP Matrix tab set the max # of frames per GOP to 18 for NTSC and 15 for PAL. Due to a bug in TMPGEnc you should also check the closed GOPs option, though unfortunately this does decrease quality marginally. Finally, on the audio tab set change the frequency from 44100 to 48kHz.

When you later burn this mpg to dvd, you must demultiplex and then remultiplex as a dvd compliant program stream. If using TMPGenc then just use the mpeg2 option as opposed to the mpeg svcd option.

[ZippyP.]

TMPGEnc templates (including peurtorican's) here: https://www.videohelp.com/tools.htm#templates

[Fred©]

Adam,

I am very interested in burning a CVD, because I have no DVD-R yet... and SVCD is able to 40 min only in a 80 CD-R...

Well, How do I know if this format is supported in my DVD Player (Nintaus N-9901)? I have already searched at DVD player list and did not find this info...

Another question: I think it will be very helpfull to us if DVDRHelp releases a CVD NTSC/PAL test video file that we could burn, to compatibily purposes, as there is SVCD and VCD videos...

Thanks,

Fred©

[adam]

For both CVDs and SVCDs, you are only limited to about 40 mins per disk if you encode in CBR. If you encode in VBR than you can fit at least 50-55 mins in relatively the same quality as if you had used VBR. If you are willing to sacrifice some quality you can even fit more than 60 mins per disk.

Using CVD does not allow you to fit any more content per disk than SVCD. The amount of content you fit is simply a result of the bitrate you choose. The main point of CVD is that since you have a lower resolution you can get away with a lower bitrate, and thus fit more content on each disk.

All SVCD compatible players are required to also support CVD, so as far as compatibiliy is concerned there really isn't any reason to treat it differently than SVCD.

[Fred©]

Thanks for the explanation, Adam,

I thought that, as CVD has a lower vertical resolution, so the file would be shorter and more video could be burnt into a CD-R.

I will try a CVD in TMPGEnc.

Fred©

[ZippyP.]

I thought that, as CVD has a lower vertical resolution, so the file would be shorter and more video could be burnt into a CD-R.

Like Adam said, "The main point of CVD is that since you have a lower resolution you can get away with a lower bitrate, and thus fit more content on each disk. "

So, you can use a lower bitrate and still maintain quality because of the lower CVD resolution. However, you are sacrificing some sharpness.

[bigmicka]

the nintaus 9901 does play cvd. its a nice little player i just recently got myself a 9808 and it plays everything.

[Fred©]

I thought that, as CVD has a lower vertical resolution, so the file would be shorter and more video could be burnt into a CD-R.

So, you can use a lower bitrate and still maintain quality because of the lower CVD resolution. However, you are sacrificing some sharpness.

I got it.

the nintaus 9901 does play cvd. its a nice little player i just recently got myself a 9808 and it plays everything.

thank you guys for explanations... It is really hard to find the answers in portuguese foruns...

Fred©

[Paul D]

I assume that a CVD will play fine in a (cheap) Chinese DVD player (as an SVCD does), but will it also play in a DVD player from say Sony or Toshiba (which reject SVCDs)?

[cosmin]

My DVD player (Panasonic DVD RV-32) plays CVD if I do the VCD header trick.

[CrumCon]

To Adam,

Is it neseccerly to check the 'closed GOPs' option? (TmpgEnc)

Because i havent do that when i made my CVDs and i have burned them onto DVD+R and my DVD player plays the movie without any problem.

Here is what i have done :
I'd preffer NTSC

1.Unlcoked Size, changed Size from 480 X 480 to 352 X 480
2.Unlocked Audio , changed Audio from 44,1khz to 48khz
3.Changed the 'MAX number of frames in a GOP' to 18

I havent checked the 'closed GOP' option under GOP struckture tab.
All my movies works great.

[adam]

I assume that a CVD will play fine in a (cheap) Chinese DVD player (as an SVCD does), but will it also play in a DVD player from say Sony or Toshiba (which reject SVCDs)?

Like I said, you should just treat a CVD as a SVCD as far as compatibility is concerned. If the player can play SVCD, it should definitely be able to play CVD. If it can't play SVCD, then there is no reason why it should be able to play CVD.

Is it neseccerly to check the 'closed GOPs' option? (TmpgEnc) )

I have noticed a bug in TMPGenc where it does not maintain set GOP length unless you close GOPs, something which you would normally not want to do. If you do not close GOPs in TMPGenc, then your GOPs may or may not be longer than what the DVD standard supports. If this happens, then your DVD authoring software may or may not accept it, and your dvd player may or may not play it. Apparantly your software and hardware do not have a problem with this, but you probably are making your DVDs slightly less compatible overall.

[xxiangg]

I assume that a CVD will play fine in a (cheap)
Chinese DVD player (as an SVCD does), but will it also play in a DVD player
from say Sony or Toshiba (which reject SVCDs)?

Like I said, you should just treat a CVD as a SVCD as far as compatibility
is concerned. If the player can play SVCD, it should definitely be able to
play CVD. If it can't play SVCD, then there is no reason why it should be
able to play CVD.

I am not sure if the above statement is always true. Two of my older DVD
players (Sampo610 and Apex1500) bought over a year ago play CVD very well.
So I made several home video in CVD format during the last year. But my
latest DVD player (Venturer 2628) bought two weeks ago can not play CVD disks.
Though it plays SVCD very well. Actually, when it plays CVD disks, the video
part is normal. The audio part is totally jammed. Then, I reburned a CVD,
changing audio from 44.1K to 48K, but had no luck. I will do more experiments
in the future, lowering audio bit rate to see if it will be helpful. I really
do not want to re-encode the disk, unless I have absolutely no choice.

[cosmin]

Like I said, you should just treat a CVD as a SVCD as far as compatibility is concerned. If the player can play SVCD, it should definitely be able to play CVD. If it can't play SVCD, then there is no reason why it should be able to play CVD.

In a previous post, I mentioned my DVD player Panasonic DVD-RV32. It cannot play true SVCD, but it plays both SVCD and CVD by applying the VCD header trick.

[Paul D]

OK apologies for my ignorance, but what is the VCD header trick and how do you work it?

[ZippyP.]

OK apologies for my ignorance, but what is the VCD header trick and how do you work it?

Basically, it's for some DVD players that play VCD's but not SVCD's. It "tricks" the player into playing VCD's but at SVCD resolution and bitrate. An SVCD spec mpeg2 is remultiplexed as an mpeg1, the resulting file is authored and burned as a VCD. Works for some, here's a guide: http://www.chryseis.be/~delphis/_Guides/VCDEasy__The_VCD_Header_trick_(v1.01).pdf

[SatStorm]

Latest TMPGenc, fix this "Gop" problem, so you don't need to close to Gops any more.