On 16 Aug 2003, Florin Andrei wrote:
> What is the reason why there's a redundant -S option in both mpeg2enc
> and in mplex?
It's not redundant.
When to use the -S option with mpeg2enc and when to use it with
mplex is not well explained but there is a difference between
the two.
Short form: use -S with mpeg2enc if you are creating VCD or SVCD,
use -S with mplex when creating DVDs
For (S)VCDs the encoder has to generate the leadin and runout
information which is not something the multiplexor can do.
> It seems to me that the -S in mplex does nothing, i cannot change the
> maximum size with it (even though the man page mentions something about
> size). It's the mpeg2enc -S that takes precedence.
The split point will the minimum of the two values (the one given
to mpeg2enc and the one given to mplex). I wager that you tried
to give a larger value to mplex than was used with mpeg2enc.
That, as you have noticed, has no effect. If however you gave
a smaller value to mplex then it might have had an effect.
> I'm trying to convert a 60 minutes cassette to DVD, i didn't specify -S
> with mpeg2enc and now mplex wants to split the file no matter what. In
> fact, it bombs out with an error, even if i tell it "-S 4700" (which
> wants to be "don't split it").
Where is it splitting? At 2GB perhaps?
Are you using the CVS version of the tools or the older 1.6.1
version? There was a bug in the older encoder that hardwired
a 2GB split point for the DVD format. And that sounds like
what you are seeing because looking at the code to the current
version the limit in mpeg2enc is 0 (meaning no autosplit markers
will be generated).
Good Luck!
Steven Schultz
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