On Sun, 17 Aug 2003, Maik Holtkamp wrote:
Hi!
> > Use a single file.
>
> Yes, I will do so.
That will work much better ;)
> dvdauthor -a.. -v.. 1.mpg 2.mpg ... <last>.mpg
>
> and as I understand the readme of dvdauthor I am in one titleset,
> when using this command:
True - BUT (and this is a part I left out): dvdauthor inserts
a "gap" (to avoid overlapping clock/timer values in the streams).
That, I believe, is what is causing the freeze/pause/stutter
which folks see. Yes, it is all in one titleset but there is
a discontinuity created at the file change points.
> As I understand both calls (-c <times> big or 1 2 3) should create
> the same result: One titleset/track with chapters.
The case using multiple files will have 'breaks' at the file
change times. Some players (and most/all software players)
handle these points better than other players but there is often
a visible glitch.
> > Are you creating DVDs with multiple angles in the video stream?
>
> No. I just read the new manpage and thought -c is probably a good
> idea. I will skip in future, THX.
I had the same thought, tried it and discovered a bug in mpeg2enc
(which was fixed soon after the report). Even after the bug was
fixed I decided that the (slight) increase in filesize was not
desireable and I removed the -c from the scripts.
> As I understand this:
>
> The more I go down with -q the more close I go to constant bitrate
> meeting my -b setting, right?
100% correct. At a certain poing the encoder effectively becomes
CBR and then varies the quality to maintain the specified bitrate.
> It uses transcode ...-w 3800 ... -N 0x50, -F 5 but I want 5.1 sound
> and thought the bitrate is rather low. My test orginal (pulp fiction
> PAL) was at 8800/1100 and the files I extracted had about 4.9 GB.
>
> So there was no need for a drastical reduction to 3800.
3800 is far too low for full frame. It is a good value for
352x576 (PAL) or 352x480 (NTSC) - the 1/2 size (which is a valid
DVD resolution).
> Moreover I thought it is a better idea to start at -F 8. I konw it is
> probably possible to extend the xsvcd profile to suit dvd needs, but
A better approach to fitting as much as possible on a single DVD
is to use the 1/2 resolution. For casual viewing the 352xN size
works very well and can more than double the amount of playtime
compared to the 720xN size.
> ..now, I understand that the prozess is hardly automatable :(. I hope
> my guessing of good values for -q and -b will increase in line with
> experiance.
Yes - experience is a very good teacher ;) After a bit of
practice you will have a good idea how to select the appropriate
values based on the quality of the sources and the desired output
size.
Cheers,
Steven Schultz
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