Why does DVD Architect need to transcode a DVD compliant MPEG?

bonnyr wrote on 10/16/2004, 4:41 PM
I am capturing some home made videos from VHS and converting to MPeg using
WinDVR3. The MPEG spec are compatible with DA's definition of valid files, yet
depending on the mpeg length, DA states that it needs to transcode the file.

Why does it do this and how can I avoid any more rendering steps.

Cheers,

Bonny

Comments

cbrillow wrote on 10/17/2004, 7:28 PM
A couple of things that I can think of:

1) Although your file may be DVDA-compatible, it may not be DVD spec, which is 720 x 480 (NTSC) 48kHz, 16-bit audio. So DVD can deal with it, but must convert to the proper spec to write your DVD.

2) You mentioned the time element. If program length is such that it exceeds the disc capacity at a given bitrate, it must be re-rendered.
DaLiV wrote on 11/2/2004, 7:22 AM
cbrillow:
they are not included all by spec ... how about mpeg2 audio in dvd spec ?
Phileas wrote on 11/15/2004, 3:57 AM
VOB(chapter points, VOB IDs, Cell IDs etc...) files aren't really the same as MPEG-2 files so trancoding(not encoding) is necesary. Second what's the sound in? As DVDA2 only outputs in AC3 and PCM, your sound will have to be encoded if its not in these formats( means you'll have to buy Vegas5!).
Phileas wrote on 11/15/2004, 3:59 AM
If a MPEG-2 file is out of spec then it has to be re-encoded not transcoded. Transcoding changes( from what I can gather) the bitrate and not anything else.