[mythtv-users] Transcoding on a non myth machine
Chris Pinkham
cpinkham at bc2va.org
Fri Jan 6 06:42:45 UTC 2006
> Aha! So in other words, even though I can set the recording directory
> path on the SBE in its setup, if it's not exactly the same as on the
> master, transcoding fails. This is inconsistent with the way
> recording and commflagging work (the commflagger was working on my
> SBE, as far as I can tell), but I'll see if I can rearrange my NFS
Yes, recording stores files in whatever the local backend's
RecordFilePrefix directory is. mythcommflag is just reading files so
it just acts like a copy of mythfrontend, so it can play files whether
they are local or over the network using myth://
> (via a symlink) /mnt/tv as they do now. Would a symlink on the SBE
> from /myth/tv to /mnt/tv (which will then traverse the mountpoint)
> be adequate, or are symlinks themselves going to be problematic?
I think a symlink would work because ProgramInfo::GetPlaybackURL()
just uses QFile::exists() to check if the recording exists locally
to know whether to strip the myth:// off or not.
> Incidentally, this particular arrangement was suggested by the
> linhes.html page on the KnoppMyth site, which talked about how to set
> up slaves; it's not clear to me how those instructions (which can only
> be talking about non-SVN versions) could possibly be right in the face
> of this transcoding inconsistency.
Never read them, so I don't know.
> has been shorted from 7 to 4. I think you could still have deleted
> these jobs from the mythfrontend status screen though by using the
> popup menu on an errored job.
>
> That seems logical, but nobody who said anything could -find- such a
> popup. I couldn't, and (IIRC) Jarod couldn't, either. (I recall
I think that must have been me, I just doublechecked and the popup
is not in 0.18.x.
> There is a volume control for ivtv compatible cards right in the
> recording profile editor. This has been there since the ivtv
> support was added to Myth.
>
> Yeah, I know about that one. It's at 90%. IIRC, I also tried it at
> 100%, with not much effect. I should probably ask Hans and/or the
> ivtv lists if anyone has any ideas there; I'm almost wondering if
I don't know if that level affects playback through the card (via
the line-in jack) or not, but if it does, and you have your soundcard
set at some percentage less than 100, then you are reducing the volume
level for playback of transcoded recordings twice.
> the problem isn't ALSA but some register setting in the cards.
ALSA has nothing to do with the volume level of recordings made with
the ivtv driver. ALSA is controlling your mixer, not the TV card.
> I could -live- with recordings being 6-12dB down from everything else
> (though the mystery annoys me), but what I can't deal with is the
> transcoded stuff being another ~12dB down from -that-. I had to
I would play the original file through mplayer/xine/vlc so it goes out
your soundcard then through your pvr-350 and then play the transcoded
file and see if they sound at the same level. If so, then the
reduction in volume you are seeing when playing a transcoded file is
because you are going through the pvr-350, if they sound different
when played back through the soundcard and pvr-350 together then
there is another issue.
--
Chris
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