Hi,
On Sun, 2010-01-03 at 22:29 +0100, Valeryan_24 wrote:
> Hello,
>
> I'm discovering Pitivi program and I'm impressed by the great features
> already existing.
>
> But I wonder if there is a very simple option, that I would miss if not :
>
> Is it possible to mix different videos with have exactly same dimensions
> and resolution : I mean just concatenate / join them, without rendering
> codecs.
>
> Ex: video A.avi, 8 minutes and video B.avi, 12 minutes (which can be 2
> parts exctracted of a global film)
>
> I want to join video A and B to one avi video file which would read A+B
> following automatically, for a total lenght of 20 minutes.
>
> In Avidemux for example, it is very easy : open video A, add video B,
> and register, it takes only a few seconds...
>
> I tried same thing in Pitivi, but I found only project with video codec
> theoraenc, audio codec vorbisenc preferences, and re-rendering, it took
> more than 8 minutes, used CPU etc...
>
> As Pitivi is much more complete, flexible and GUI-easy than Avidemux, as
> it should be included as default in the next versions of Ubuntu, I'd
> like to switch on it, but I need this very basic feature.
>
> Did I make something wrong, and if yes how to do this concatenating, or
> if no is it planned to be included in Pitivi roadmap ?
Currently rendering will decode and reencode all the files.
Rendering without decoding/encoding is only possible if:
(1) the source files are used from the beginning of a GOP (i.e. starts
with a keyframe) to the end of a GOP (i.e. just before a keyframe or at
the end of the file)
(2) AND no effects are applied (no volume modification, no alpha
modification, no blending, NOTHING)
(3) AND the source files are 100% the same (same codecs, same
width/heigh/bitrate/profile/level/depth,...)
It is planned.. but is not a top priority right now since to properly
implement this in PiTiVi you need detection of the above 3 requirements
(item 2 could be trivial, the other ones are a bit trickier).
One could write a simple tool for concatenation-only of files though
using gst-python, Jan Gerber (j^) wrote a script to concatenate parts of
qt/h264 files using GNonLin (without decoding) and it apparently worked
fine.
Edward
>
> Thanks in advance for your help. Best regards,
>
> Xavier
>
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