[mythtv-users] transcoded nuv/mpeg4: really mpeg4?

[Isaac Richards]

On Thursday 18 August 2005 12:53 pm, Brian J. Murrell wrote:
> On Thu, 2005-08-18 at 11:42 -0500, Kevin Kuphal wrote:
> > You're mixing apples and oranges.  The recordings are in MPEG4 (DIVX or
> > XVID, i can't remember) inside an NUV container.
>
> OK.  Good so far then.
>
> > You can't just
> > "recontain" a video
>
> Why not?  The container just holds the audio and video segments/frames
> and syncing information doesn't it?
>
> I am proposing extracting the frames/segments without decoding and
> re-encoding them and placing the extracted frames/segments into a new
> container.  AVI or OGG for example.

You don't really understand much about AVI, though.  It contains _no_ syncing 
information.  A straight repack will lose av sync extremely rapidly.  ogg's 
pretty much the same way.

> > so you have to re-encode it to another container
> > (which is what nuvexport does).
>
> But why should I have to re-encode the streams just to put them into a
> different container?  I thought the stream type was independent of the
> container.  I have put MPEG4 into an OGG container before for example.

As long as the containers are relatively equal in capabilities, sure, that's 
possible.

Isaac