Re: Problems with dvdauthor - please help.

From: Peter (phaywood_at_alphalink.com.au.NO.SPAM)
Date: 01/03/05 

Date: Mon, 03 Jan 2005 00:57:50 GMT

Groovy hepcat George was jivin' on Tue, 28 Dec 2004 00:58:39 -0500 in
comp.os.linux.setup.
Re: Problems with dvdauthor - please help.'s a cool scene! Dig it!

>Hi all,

  Howdy! And sorry for taking so long to get back to you!

> It looks like the video I was trying to write to a DVD did not have
>some information in it required by dvdauthor. I looked at the man page
>for "mpeg2enc" and the "-f" option states the following:
>
>-f|--format 8
>- DVD MPEG-2 for 'dvdauthor'
>This version adds special dummy navigation packets into the output
>stream that the dvdauthor tool fills in to make a proper .VOB for
>authoring. Bit-rate defaults to 7500kbps, buffer sizes to the maximum
>permitted by the DVD specification.
>
>This is what was missing in my mpeg file.
>
>I used the "tovid" tool to properly convert my mpeg and it worked! I was
>able to successfully get qdvdauthor to make a dvd for me. (mind you,
>there were some other big bugs in the qdvdauthor tool that I figured out
>how to avoid. :))
>
>However, there was a big drop in quality from the original MPEG video
>using "tovid". It reads the mpeg and modifies it. I'm sure I could
>optimize all of the settings for mpeg2enc but there are so many and I
>know very little about mpeg files.

  I've not used tovid, so i can't help you with it. But maybe there's
a way of specifying the bit rate. I use transcode, and although it
uses mpeg2enc to do the actual conversion, it has a different default
bit rate to that specified above. I have to specify the bit rate
explicitly to get any decent quality. Maybe you need to do the same
with tovid.

>What I'd like to know is what the "special dummy navigation packets" in
>the mpeg file are? If I knew this, I could add them myself without
>having to re-process the mpeg file again (and decrease the video quality).

  I can't help you with that, i'm afraid.

>P.S. Thank you noi, Wiseguy, and Peter for your help! I really
>appreciate it! :)

  No problem. :) 

-- 
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