[Dvdauthor-users] Can I turn a mpeg dvdauthor compliant without reencoding?

[Marko L. <mar...@gm...>]

Hi!

Is there a command to make a non-compliant mpeg2 into a compliant
mpeg2 without reencoding?

I get the mpegs from my camcorder (Panasonic sdr-s150). Using them
directly with dvdauthor, I get the error.

WARN: Skipping sector, waiting for first VOBU...

Using the windows dvd application that came with the camcorder
(generating a dvd from a single mpeg file) I get DVD structure with a
VOB file which is very similar to the original mpeg. It has about
about the same size (slightly smaller) and a diff of the hexdump of
the files shows that most of the bytes are identical. The difference
comes after a regular amount of bytes. Apparenlty the only difference
is some kind of header information, so I suppose that no mpeg
reencoding is performed. I have tried dvdauthor with such VOB files
and it works without complaining, so this method solves my problem,
except that switching to windows and doing all the GUI manipulations
for each file is really not practical...

So I would like to know if I can do the same in linux. Decoding and
reencoding seems a bad solution to me, it takes time and it gives
suboptimal quality (optimal being of course the original mpeg
encoding).

I have tried

  ffmpeg -i orig.mpeg -target pal-dvd new.mpeg

It produces compliant a mpeg, but reencodes the file, the quality is
not the same (besides I get a strange problem when playing the
resulting dvd on my tv which I couldn't yet solve). I also tried

  ffmpeg -i orig.mpeg -vcodec copy -acodec copy new.mpeg

but the resulting file is also not dvdauthor compliant (same error
occurs as for the original file).

I have also played a bit with mjpeg-tools commands but couldn't find a
way to do the manipulation I want.

Thanks a lot!
Marko