[mythtv-users] Mytharchive video/audio out of sync

Andrew Chuah hachuah at gmail.com
Thu Oct 5 03:32:44 UTC 2006


Hi,

I've noticed that in my recordings, some are being recognized as fps
29.92 and some at fps 29.97 (which I think is the correct one for
NTSC). Anyway, I did some experimentation and the ones that are
recognized as 29.97 all come out ok. It's only the ones that are run
at 29.92 have audio sync problems...

-andrew

On 10/3/06, Paul Harrison <mythtv at dsl.pipex.com> wrote:
> Andrew Chuah wrote:
> > Hi,
> >
> > I've figured out what was wrong with mine... it seems that
> > mytharchivehelper is getting the wrong length?
> >
> > localhost mythplugins # mytharchivehelper -i
> > "/myth/tv/1058_20060514180000.nuv" /backup/tmp/work/1/streaminfo.xml 0
> > 2006-10-02 22:03:42.357 Opening /myth/tv/1058_20060514180000.nuv
> > 0: start_time: 0.000 duration: 4.490
> > 1: start_time: 0.000 duration: 4.490
> > stream: start_time: 0.000 duration: 4489.516 bitrate=1411 kb/s
> > Input #0, nuv, from '/myth/tv/1058_20060514180000.nuv':
> >   Duration: 01:14:49.5, start: 0.000000, bitrate: 1411 kb/s
> >   Stream #0.0: Video: mpeg4, yuv420p, 480x480, 29.92 fps(r)
> >   Stream #0.1: Audio: mp3, 32000 Hz, stereo, 1411 kb/s
> > 2006-10-02 22:03:42.363 duration = 4489
> >
> > The show is a 1 hour show (MythTV shows 58 mins), why is
> > mytharchivehelper showing it as 1 hour 15 mins?
> >
> > BTW, I just reloaded SVN and the problem still exists. I'll try to
> > look at the source code tomorrow and see if I can understand it... :)
> >
> > -andrew
> >
>
> I don't think getting the wrong length is the problem. mytharchivehelper
> actually uses three different methods to get the recording length
> depending on the type of recording, how accurate the length needs to be
> and how quickly we need to get the length (you don't want to wait around
> 2 or 3 minutes when using the UI while the length is calculated). The
> last parameter determines what method to use 0, 1 or 2. See
> mytharchivehelper --help for a brief description of what each one does.
> In any case I don't think the calculated length has anything to do with
> audio sync .... but I could be wrong it's not unknown ;-). Looks like
> Geoff is back on the seen maybe we should bend his ear on this one.
>
> Paul H.
>
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