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 <[EMAIL PROTECTED]> 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.
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