[mythtv-users] BBC HD h264 how to handle

Neil Dunbar neil.dunbar at pobox.com
Fri Nov 16 13:03:00 UTC 2007

On Fri 16 Nov 2007 10:11:09 David Greaves wrote:
> Michael T. Dean wrote:
> > On 11/15/2007 08:09 PM, Rudy Zijlstra wrote:
> >> Neil Dunbar wrote:
> >>> On Wednesday 14 November 2007 23:57:49 Michael T. Dean wrote:
> >>>> Myth doesn't use the system-installed ffmpeg libs.  It has its own
> >>>> customized versions.
> >>>
> >>> In that case, there's even less likelihood of having PAFF and all the
> >>> other H.264 goodness as part of 0.20.2 - which would mean that BBC HD
> >>> streaming might have to wait a bit longer.
> >>
> >> Take a look at the "ffmeg sync" thread on myth-dev to read up on the
> >> recent status.
> >
> > But you are right about it not coming to 0.20.2 (or any other 0.20
> > version).
> So does anyone have a decent mencoder incantation to transcode it into
> something just as high def but smaller and more playable?

That I can help with:

I find that if you install encode2mpeg - a rather nice frontend for mencoder, 
then things like:

encode2mpeg -avi -avionly -o <output> -qmatrix hi-res -n p -ofps 25 -encode 
0:4:2 <input.mpg> 

produces a perfectly nice MPEG-4 AVI in about 10 hours for a 2 hour broadcast 
on a 2.13Ghz Core 2 Duo. If you want uber high quality, then "-encode 0:4:3" 
gives a 3 pass effort, which will take about 16 hours in total, but my eyes 
just ain't that good to tell the difference. I suspect that resizing to 
1280x720 would produce a much smaller file, while retaining picture quality.

The incantation about takes a typical 11Gb file and reduces it to about 7.5Gb, 
keeping the resolution the same.



More information about the mythtv-users mailing list