[MEncoder-users] Re: Specifying ranges on multiple input files (was Re: How to specify an action range in mencoder?)

[Enzo]

Dear Guillaume, dear mplayer specialists all,

is there a more precise way to express action ranges in mencoder?
Something like -sframe /s/, meaning processing should start at frame s
(when possible) or at the nearest possible following frame, seems to me
much better than -ss /time/.

Furthermore, as Guillaume already pointed out, option "-ss" is not very
much precise with mpeg2 files:
> (for example, precise seeking doesn't work well with DVDs and MPEG2
> files.... and doesn't work at all with flv files). 
I understand that this is possibly a consequence of the way mpeg2 are
encoded, but I believe this must not be the only cause: I tried on
several input files and each time I have always to adjust the time
manually -- a little bug maybe?

Thanks in advance for your ever insightful replies,

cheers,

Enzo.

Enzo ha scritto:
> Dear Guillaume,
>
> thank you very much. Sorry that I did not RTFM first!
>
> Now, if I may ask your help again (after having RTFM'ed and checked
> for the feature ;-) :
>
> Would it be possible to run mencoder specifying more than an input
> file and, for each of them, specifying an (-ss, -endpos) couple?
>
> I mean, something like this:
>
> mencoder -ovc /somecodec/ -o output.h264 -ss 2:48 -endpos 55:00
> input1.mpg -ss 1:12 -endpos 55:02  input2.mpg -ss 3:55 -endpos 54:58
> input3.mpg
>
> whose semantics should be "run mencoder on input1.mpg, starting at
> 2'48'' and for 55'; then continue with input2.mpg, starting at 1'12''
> and for 55'02''; then continue with input3.mpg, starting at 3'55'' and
> for 54'58''."
>
> I think the one above would be an interesting extra feature for
> mencoder -- if it is actually missing, I mean.
>
> Thanks for your tips!
>
> Cheers,
>
> Enzo.