Posted by Rick Merrill on 07/05/06 13:32

joeu2004@hotmail.com wrote:
> Rick Merrill wrote:
>
>>joeu2004@hotmail.com wrote:
>>
>>>My DVD recorder (Sony RDR-VX530) can record DVD -R/-RW in either
>>>"Video" or "VR" mode. What are the internal differences?
>>
>>[....]
>>VR mode, AFIK, cannot be used on DVD players.
>
>
> As I stated, the Sony RDR-VX530 DVD recorder/player supports reading
> and writing VR mode (DVD-R and DVD-RW). That is fact, not supposition.
> I have the user manual in front of me, having just bought the device.
>
> Perhaps what you meant to say is: that is not a common feature -- at
> least, not a common feature of older DVD recorder/players. (VX530 was
> released in June 2006.) Or perhaps you meant to say: VR mode was not
> originally intended for DVDs.
>
> That would be useful information to know, if you could clarify it. But
> it might also help my understanding if you could explain what "VR mode"
> is and what is was originally intended for, if not for DVDs.
>

It was ment for recorder/players not for just players (i mean the
harware, not you ;-)


> And I am still interested in knowing the internal format differences.
> I would like to know if VR mode is backward compatible with Video
> format or vice versa, or if they are mutually compatible. Notably, I
> would like to know: if I write a DVD in VR mode, is it not likely to
> be readable on most DVD players -- most older DVD players, or even most
> newer DVD players? [1]

VR mode should work on recent Sony camcorders/recorders, but not on most
players.

VR mode is for editing, DIY.

> [1] A Google search did turn up the following thread circa June
> __2004__:
> http://forums.afterdawn.com/thread_view.cfm/88857 . It states that
> support for DVDs in VR mode was a presumably recent feature of (then)
> only some Sony, Pioneer and Emerson DVD recorder/players. It also
> states that, then, VR-mode DVDs was incompatible with most DVD players.
> But that was 2 years ago in a fast-changing industry.
>
> Another article circa 2005(?) --
> http://archive.avsforum.com/avs-vb/history/topic/487418-1.html -- adds
> Toshiba to list of DVD recorders that support VR mode. But it notes
> that, at the time, Toshiba "VR" DVDs are not compatible with some other
> "VR" DVD players, namely Pioneer. This article notes some of the added
> features of VR mode. But it does not describe the internal format,
> which is what I am interested in.

My guess is that the internal format is simplfied, less compressed form
that is easy to edit so that sound and video stay synchronized.

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