[mythtv-users] Transcode blues...
Michael Tiller
michael.tiller at gmail.com
Wed Nov 29 15:52:33 UTC 2006
One question...is it better to do this with the built-in transcoding or does
it make more sense to user a user job? (that is what I am working on
currently)
For example, at this point I cannot play HD recordings directly on my
frontend. I'd like to transcode all HD recordings down. But if I set up
automatic transcoding then it seems like I'll get into a situation where I'm
transcoding everything which is unnecessary. Using a user job, at least I
can check the dimensions of the recording to see if it needs transcoding
otherwise do nothing. Or, perhaps I'm misunderstanding how automatic
transcoding works?!?
--
Mike
On 11/29/06, Joe Silver <devils.taco at gmail.com> wrote:
>
>
> On 11/26/06, Michael Tiller < michael.tiller at gmail.com> wrote:
> > > I've never used transcoding in MythTV (automatic or otherwise) but
> > because I
> > > recently got an HDHomerun I am now dealing with two issues that, it
> > would
> > > seem, would benefit from transcoding.
> > >
> > > The first is that I can now get HD. For the time being, I cannot view
> > HD
> > > (still working on XvMC, etc but no joy so far). What I'd like to do
> > in the
> > > meantime is trancode things down. I thought this would be
> > simple. Just
> > > setup a transcoding profile (I used the High Quality one) to transcode
> > to
> > > 720x480. I used a bit rate around 3800 and left pretty much
> > everything else
> > > the same. I used this to transcode an HD program. The results were
> > > terrible. First, the file size went from 7Gb to 6.6Gb. This despite
> > the
> > > fact that I was transcoding from MPEG2 to MPEG4?!? The picture
> > quality was
> > > pretty bad (in spite of this) and, finally, the playback was
> > jerky. This
> > > seems like such a straightforward thing, how did I screw it up?
> > >
> > > The second is that I can now get SD broadcasts as well. However the
> > audio
> > > is AC3. Unfortunately my MediaMVPs can't play this (even though mvpmc
> > says
> > > it supports AC3). So I thought I would simply do some kind of
> > MPEG2->MPEG2
> > > transcoding switching the audio to MP3. But this doesn't seem to be
> > an
> > > option. If I want to transcode it seems like I can only trancode to
> > MPEG4
> > > or RTJpeg (?). But those won't play on the Media MVP. Am I correct
> > in
> > > saying that there is no support for MPEG2->MPEG2 trancoding? I could
> > swear
> > > I've seen people talk about that before?!? Ideally I'd like lossless
> > video
> > > trancode ( i.e. strictly AC3->MP3 transcoding).
> > >
> > > Oh yes, and lastly I would like to try and save space by transcoding
> > some of
> > > the movies I have down in MPEG2 to MPEG4. I've tried this with mixed
> > > results. Often the transcoding bombs out with an error status of 0
> > (is that
> > > an error status?!?) or 255. Where do I look to find out more details
> > about
> > > why the failure occurred? Also, while successful commercial flaggings
> >
> > > appear in the jobs queue window in MythWeb, it doesn't show successful
> > > transcodings (only unsuccessful ones) which makes me a big nervous.
> > >
> > > Any pointers would be very much appreciated. Thanks.
> > >
> >
> >
>
> I just tonight found a post with a link to some hd transcoding tips. they
> might be useful:
> http://www.myhdbox.com/mythtips/
>
> i haven't tried these exact profiles yet, but they're pretty close to what
> i've had been doing to play back transcoded HD on an xbox frontend. i was
> doing essentially the 'resize med' profiles and using mp3 for the audio. i
> use an identical profile for SD transcoding with an exception of changing
> the resolution to 512x384.
>
> good luck.
> JS
>
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