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

Brian J. Murrell brian at interlinx.bc.ca
Thu Aug 18 16:53:09 UTC 2005

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.

> 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.

>   nuvexport puts it inside an AVI container.

It also decodes each frame and re-encodes them.  This seems like an
unnecessary need for lots of computation and further picture quality

Of course the other alternative is to just libraryize the Myth NUV
format enough that other projects like mplayer and xine can use it.


My other computer is your Microsoft Windows server.

Brian J. Murrell
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