[mythtv-users] Converting "mythtranscoded" files to avi...

[Scott Pleavin]

Steve Smith wrote:
>
>
> On 02/01/2008, *Irumbo Mateene* <imateene at hotmail.com 
> <mailto:imateene at hotmail.com>> wrote:
>
>
>     I installed and used nuvexport to transcode my nuv files to a
>     format of my choice .. nuvexport supports several different
>     formats  including ipod/divx and xvid formats..
>
>     nuvexport is a stand alone script that can do the job for you ..
>
>     You can also create a myth job that you can selectively run on the
>     shows you want to convert to the format of your choice.
>
>     for my needs nuvexport is more convenient as it allows me to
>     interactively specify the bit rate and other things ..  you can
>     start with nuvexport and once you know what parameters you use for
>     encoding you can then create a myth job that will do the
>     transcoding ..
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>  
>  
> Folks,
>  
> I've been doing some experimenting:
>  
> What I'm Trying to Transcode to a Portable (i.e. non-NUV!) Format
> ================================================
> Myth:0.20-fixes
> Sources: 1) DVB-T (freeview) i.e. MPEG2-TS files
>               2) PVR-150         i.e. MPEG2-PS files
>  
> Transcoded using Mythtranscode on MPEG4 settings to NUV files.
>  
> O/S Ubuntu Feisty.
>  
> What I've Tried So Far on the MPEG4 NUV files
> ==================================
>  
> ffmpeg:    
> ----------
> ffmpeg -i FILE.nuv -vcodec copy -acodec copy -r 25 OUT.avi
>        Doesn't work at all. My version of ffmpeg doesn't seem to 
> understand the NUV container
> correctly. It produces completely unplayable files.
>  
> NUVEXPORT  & nuvexport-xvid --mencoder:
> --------------------------------------
>       Bizarre!!!
>       Coversion starts OK then at some point in the conversion all 
> goes haywire the left hand border of the picture moves to the centre 
> and you get wierd colour washes.
> i.e.
>        ||  The IT Crowd ||           becomes      | Crowd ||||  The IT |
>  
> This is the second time I've seen this effect with both DVB and 
> PVR-150 original sources. Also with mytharchive trying to create DVD 
> from these NUV files.
>  
> vlc:
> ----
>   VLC can play the nuv files on Windows with no problems, so I thought 
> I'd try its transcoding abilities. It seems that there are differences 
> between the Ubuntu and Windows versions.
> Suffice to say the only one with any degree of success was:
>  (Windows VLC)         NUV ---> MPEG2-PS
>  This plays perfectly on VLC but on the DVD player it looks like the 
> bit rate is set way too low.
>   
> mencoder:
> ---------------
>       mencoder INFILE.nuv -ovc copy -oac copy OUT.avi ( I forget the 
> exact syntax)
>  
> This produces ALMOST playable results. However glitches (maybe in the 
> original) means that the DVD player bombs out playing them. So a 1:30 
> sample may only play for 5 secs before it "crashes".
>  
> THE BEST RESULT SO FAR IS:
>       Using mencoder to Re-encode (yes I said I didn't want to do 
> this!) to XVID (in an AVI container).
>       HOWEVER this results in the dreaded lip-sync problems, which the 
> yamada dvd-player doesn't provide adjustment for.
>  
>  
>  
>  
>  
>  
>  
> So:
>    1) Has anyone else seen these nuvexport problems?
>    2) Any other suggestions for NUV (mpeg4) to "portable format"?
>    3) I'm considering replacing "mythtranscode" with something else 
> e.g. ffmpeg, mencoder -> divx etc. However in the past I've had lip 
> sync problems with MPEG-TS--> MPEG-PS any idea how to solve this?
>  
> It seems the "simple" matter of archiving my recordings to a portable 
> format is not really simple at all.
>  
>  
> Cheers
>  
> Steve 
>  
>        
>
>  
> ------------------------------------------------------------------------
>
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>   


I used nuvexport last night to transcode a bunch a files and it did a 
fine job although it takes a long time.

 nuvexport --transcode

selected xvid and took all the recommended options.

I used this guide www.mythtv.org/wiki/index.php/Nuvexport and followed 
General Usage


Scott
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