[mythtv-users] Archiving Shows to DVD

[Cory Papenfuss]

On Mon, 1 Aug 2005, Fredrik Karlsson wrote:

> On 8/1/05, Cory Papenfuss <papenfuss at juneau.me.vt.edu> wrote:
>>         I just looked through this a bit.  I must admit I haven't tried
>> it, but as far as I can tell from reading through the code, it starts out
>> by demuxing/remuxing the MPEG stream.  That will break audio sync on
>> arbitrary ivtv captures.
>
> Hi,
>
> Ok, I had not realized this.. although I have acctually used these
> scripts and my recordings are all IVTV captures, so I am not sure how
> big a problem this is..
> Changing strategy would probably be wise though..
>
> /Fredrik
>
 	It's a very insidious problem.  The ivtv chip will hiccup once 
in awhile, and generated A/V offsets in the capture that break standard 
demux/remux utilities.  It doesn't happen most of the time.  It does seem 
to happen more often from tape captures (where I found it).

 	Unfortunately, all of the cut and/or burn scripts (nuvexport as a 
big example) use this technique.  It works 99% for 90% of the people out 
there who never capture tapes.  It works probably 60% of the time for the 
8% of the people who don't do tapes, but have marginal reception.  It 
works 10% of the time for the 2% who capture from tapes.

 	In other words, most people don't notice the problem... but some 
day they likely will... :)

-Cory



*************************************************************************
* Cory Papenfuss                                                        *
* Electrical Engineering candidate Ph.D. graduate student               *
* Virginia Polytechnic Institute and State University                   *
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