[mythtv-users] Re: Getting good audio sync in nuvexport/transcodings w/cutlist?

[john sturgeon]

LOL... Yep.. that would be me, and yes, I use ProjectX, and yes, the
gradually growing sync problem is not resolved by using ProjectX.

-- 
John <><.

On 5/31/05, Neil <neil-on-mythtv at restricted.dyndns.org> wrote:
> Likewise, I'm on the same boat you guys are. :) The Audio/video sync issue
> happens gradually in my situation. Video gets delayed .5 secs, 1 sec, 1.5
> secs, then 2 secs. This is for a 1 hour recorded program.
> 
> However, I spoke to someone last night on mythtv-users(Agrajag). He pointed
> me to a thread here which was similar to our audio/video sync issues.
> Unfortunately, I couldn't remember the link. However, I do remember the tool
> that was mentioned as the a/v issue life saver. It's called ProjectX. I ran
> it last night. Once I reach home later, I will convert the files generated
> by ProjectX into DVD format. I will let you know if audio/video sync is
> gone. Oh btw, I'm taking the same source .nuv file. This would compare both
> approach as apples to apples comparison.
> 
> I'll let you know guys!
> 
> Thanks,
> 
> Ronneil
> 
> >Re: audio sync: Welcome to my world. It's incredibly frustrating, and
> >only happens with 720p material. After transcode, my audio loses step
> >with video at about the rate of 850ms/hour of programming. Very
> >consistent, very repeatable. I have absolutely no solution. Sorry to
> >respond with a 'meee toooo' but I'd love to hear if somebody has an
> >answer.
> >
> >Re: transcode speed: What transcode paramaters are you using? Are you
> >resizing? I get very acceptable transcode speeds with 720p material
> >using ffmpeg (from transcode). I can't remember the fps off the top
> >of my head, but I think it's roughly 30fps.
> >
> >--
> >John Sturgeon <><
> >http://www.sturgeonfamily.com/mythtv.php
> >
> >
> >On 5/28/05, Brad Templeton <brad+myth at templetons.com> wrote:
> >>
> >> Well, I've seen a number of threads about this but no clear resolution.
> >>
> >> Recently I've been trying to transocde a 720p MP2 file to MP4 with
> >> a cutlist. The file is 4 hours long -- 22 gigabytes, and it has
> >> a whopping 76 minutes of "cuttable material", so use of a cutlist
> >> is pretty important.
> >>
> >> However, the result had steadily worsening audio sync, getting over
> >> a second off eventually. I used divx bucause xvid was so slow
> >> (4fps on a 60fps recording) that it would take at least 33 hours
> >> to transocde even on a fast machine. That's with ffmpeg, should I
> >> try transcode? (mencoder does not work yet).
> >>
> >> Even dvix took over 8 hours to transcode, but that's a touch more
> >> tolerable. Worse, while this is 60fps, it's really 24fps underneath,
> >> most frames are duplicates. Alas the mythtransocde | ffmpeg approach
> >> presumably doesn't allow the encoder access to the knowledge it's just
> >> been handed an exactly duplicate frame and shouldn't waste its time.
> >>
> >> To my surprise, also, while I asked for a bitrate of 7200, which should
> >> have generated a file in the range of 9 gigabytes, I got one that
> >> was 4 gigabytes. It is actually pretty good, video wise, though
> >> with some obvious artifacts in smooth surfaces and a little blurring.
> >> But I felt I was willing to spend more space on it and hopefully be
> >> rid of those.
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>