How do you create Constant Bitrate DVD's?

[Undead Sega]

How do you create Constant Bitrate DVD's?

i know sonme here might say it isnt possible, but on other places it is possible and from what ive read, the highest it can go up to is just over 9000KBs.

overall a DVD's bitrate is 13MBs, this is the included video and audio bitrates put together. and its been said, the reason why they have an average bitrate is because 'for scratches on the disc'.

i actually think having a constant bitrate DVD would be great, not going into details now, but i dont think i have seen a constant bitrate DVD anywhere on the markey.

i would really appreciate it if anyone can help me out here.

thanks, and look forward to your replies.

[videopoo]

9.8 is the spec limit for video and audio. I often use a CBR encode when space isn't an issue. However no encode is completely CBR. Depending on the quality of the encoder, there are some spikes. I personally wouldn't set a bitrate at 9Mbs but many here do.

Yes, there are several CBR encodes on the market.

[Undead Sega]

Excellent, and when mentioning that their not completely CBR, i was thinking of using TMPEG (as my no.1 encoder) and get the bitrate nwo to 9800KBs?

ho wowuld u create a CBR DVD though? cause i use Nero Vision, and i know for a fact that it averages the bitrate, even getting it to the highest.

[tinker]

CBR or VBR is a matter of encoder. I know TMPGEnc can be set either to encode CBR or VBR.
VBR is better, because ,if encoder is good, it will use higher bitrate for fast motion video and go low on slow or still scenes. This way file is reasonably small with good picture quality.
Most or all DVD are done in VBR. The 9000bps Max is usually done to be more compatible with older players, where the processor was not as fast to handle high bitrate.

[Undead Sega]

but 9000KBs is the high bitrate, and i am aware of the fact on what VBR can do, thus asking on how to create a CBR DVD, as i cannot find any guides or posts here on how to do so.

not to forget to mention, filesize is not a matter here for me.

anyone may i ask?

[Midzuki]

As tinker said:

CBR or VBR is a matter of encoder.
I know TMPGEnc can be set either to encode CBR or VBR.

So, if you're going to use TMPGEnc, the first step is:
forget the wizard, and learn how to tweak it manually.

==================

[Undead Sega]

i have been using TMPEG for over 5 years, so i am aware as well to know how to configure it, but using TMPEG is for making the MPEG files, but when transcoding it onto DVD, its a slightly different matter as it will place its own bitrate at whatever u set it and will average it out.

how can i make a DVD with the birtate just constant?

[Midzuki]

Apologies.

but when transcoding it onto DVD, its a slightly different matter as it will place its own bitrate at whatever u set it and will average it out.

cause i use Nero Vision, and i know for a fact that it averages the bitrate,
even getting it to the highest.

Please try to check the resulting .VOBs with BitrateView or some similar application.
If it does confirm the original CBR was reduced/averaged, then the source of your
current problem is the authoring software you're using --- namely, Nero Vision.
Give a try to applications that surely do not even think of re-encoding your MPEGs,
such as DVD-lab(payware) or dvdauthor(freeware). HTH.

-----------------------

[videopoo]

Your authoring tool should not re-encode your MPEG file. Once you have a CBR encode thats it. Bring it in to your authoring tool and build.

[Undead Sega]

i see then, but doenst DVD LAB do transcoding?

[videopoo]

It may be an option....never used it myself. But if you encode your MPEG stream ,before bringing it into your authoring tool, this is something you don't want to do. Think of DVD as 2 different processes - Encoding and Authoring

[redwudz]

Nero has a bad habit of re-encoding just about anything you put into it. Even DVD compliant video. This results in quality loss. Turn of the 'Re-encode' function or use a authoring program that doesn't re-encode.

If you look to the upper right on this page for 'WHAT IS' DVD, you can see the DVD specification and format. As long as you adhere to those specifications, there is no reason to re-encode when authoring.

If you want to use CBR encoding, fine. CBR is fine for shorter files. Just realize that with CBR you may be wasting bitrate on slow moving scenes and space on your DVD. This won't matter if you have a short video or lots of space for the video., then you may be able to use video bitrates up to 15,000Kbps, if your players can handle that. But not all do. I usually try to limit the video bitrate to about 9500Kbps, just to have the highest compatibility with most players.

Bitrate is determined by the running time of the video and the space you have to put it in. VBR, especially two pass VBR, makes better use of bitrate with a longer running file. It allows the maximum bitrate for fast scenes and keeps it lower for slow scenes. This maximizes the use of your space on the DVD.

You can use a bitrate calculator to determine the bitrate needed for a video versus the space you want to put it in. Some bitrate calculators: https://www.videohelp.com/tools/sections/bitrate-calculators

[guns1inger]

DLP has a transcoder that is for optional use if your video doesn't fit. It does not transcode unless you explicitly tell it to.

Constant BitRate encoding is a matter for your encoder, and nothing else.

The actual maximums for DVD are 9800 kbps for video, and 10080 kbps for any single combined audio and video stream. Many players tend to struggle at you get close to these maximums when playing from burned media because of the lower reflectivity of the surface, amongst other factors.

Constant BitRate encoding is only useful at higher bitrates if quality is of concern, and of course the higher the bitrate, the lower the amount that you can fit on a disc.

Finally, you do not transcode video when creating a disc. You author a disc. Transcoding is not a function of authoring. Ever.