[mythtv] Broken AV sync after mythtranscode

Tino Keitel tino.keitel at gmx.de
Sat Dec 24 08:26:36 EST 2005

On Thu, Dec 22, 2005 at 11:11:40 -0800, Geoffrey Hausheer wrote:
> On 12/22/05, Steve Adeff wrote:
> > there are some win32 apps that do similar to what ProjectX does in fixing
> > streams, though what ProjectX is really good at is fixing A/V sync issues in
> > mpeg files, from what I've read by people in "the know", its an uncanny
> > ability....
> The program is not magic.  It only has PTS and DTS info to go by. 
> mythtranscode can fix some types of A/V issues (missing/broken Video
> frames), but not others (broken/missing audio frames).  Doing so is
> possible (to some extent), but I haven't coded it yet.  However, I
> don't plan to reproduce a full-fledged video editor in this tool.
> None of that has much to do with what is going on here though.  I need
> a test case that I can use to even see the problem, and enough info to
> understand exactly what users are experiencing and where.  In the
> cases that I've seen, there is a backwards jump in the PTS (which is
> certainly broken), but mplayer seems to compensate appropriaetly, so I
> don't see any evidence of a significant A/V distontinuity.  As the
> problem is there in the original, mythtranscode shouldn't make
> anything worse. I'll be happy to try and fix anything I can reproduce.
>  To that effect, I need a stream to work on, as I haven't seen this
> happen with any of the files in my collection.

I can provide the stream which has broken AV sync after
mythtranscode, if you don't mind downloading several hundreds of MB.
I'll send you the URL in a private mail, to ensure that only you will
download it.


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