[mythtv-users] Transcoding to mp4 to reduce file size

Don Jerman djerman at pobox.com
Sat Nov 10 14:48:55 UTC 2007


On Nov 10, 2007 9:37 AM, Chris Isip <cmisipster at gmail.com> wrote:
>
>
>
>
> On Nov 9, 2007 7:16 PM, Dan Wilson <dwilson at dslextreme.com> wrote:
> >
> >
> >
> > On 11/9/2007 at 6:31 PM Chris Isip wrote:
> >
> > > I'm hitting the limits of my file storage.  I was wondering if there is
> > > a
> > > way that I can transcode the mpeg2 programs to mpeg4 and still let the
> > > videos be viewable in mythtv "Watch Recordings".
> > >
> > > Thanks
> > > Chris
> > >
> >
> > I use the internal transcoding available in myth to convert mpeg2 into
> mpeg4.  I get about 50% reduction in size, bringing an hour of SD tv down to
> about 1 GB.
> >
> > HTH,
> >
> > Dan.
> >
> >
> >
> >
> >
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>
> I was looking more towards a reduction  in size from 1.43  GB to 200 MB for
> a 1 hour SD show.  I found a ffmpeg formula for transoding to ipod touch and
> it did just that.  The quality was acceptable for playback fullscreen on my
> TV as well , but mythtv will not play it ( I tried renaming the transcoded
> file to the original filename).
>
> Has anybody used ffmpeg or mencoder to achieve this.  I'm not really sure
> what myth thinks the video should be before it can play it.  Theres probably
> going to be some database edits as well.
>
> Thanks
> Chris
>
>
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>
>

You can configure your transcoding profile to shrink the video size,
which will do what you're looking for. It'll also lose some quality,
but there you go, tradeoffs.  480x480 should cut the size in about
half without changing the quality much on a SD TV.  After that you'll
start to see the degradation accelerate.


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