[mythtv-users] Converting HDTV to SDTV

jarpublic at gmail.com jarpublic at gmail.com
Thu Jan 29 01:11:34 UTC 2009


On Wed, Jan 28, 2009 at 8:03 PM, Adam Siegel <agsiegel at gmail.com> wrote:

> I just replaced my PVR350 with a pair of AVerTVHD MCE A180s in preparation
> for the HDTV deadline.  Yes, I use an antenna - no cable here.  Having two
> cards is great as I can record more than one program at a time.  I had very
> few problems with their install, thanks to this forum.  They are working
> perfectly.
>
> My front-end units on a couple of the televisions in the house are
> Hauppauge MediaMVPs.  I've used the mvpmc distro for a couple of years now
> without any issues.  However, these units can't process the 1920x1080 mpeg2
> stream (not to mention network bandwidth issues).  So I need to transcode
> the recordings.
>
> I can't seem to get a good read on what to use and the paramters for the
> various programs.  I have tried both mencoder and ffmpeg.
>
> The first thing I do is check to see what resolution the recording is by
> doing
>
> $w = `mplayer -nosound -vo null -ss 03:00:00 -really-quiet -identify $F1
> 2>/dev/null | grep ID_VIDEO_WIDTH`;
>
> in a perl script.  If the width is less than 720, the the MediaMVPs seem to
> work fine and no transcoding is necessary.  However if it's greater than 720
> I transcode with ffmpeg
>
> ffmpeg -i $F1 -croptop 12 -target ntsc-dvd $F2
>
> I needed to add the croptop because there is some noise that I get in the
> recording (don't know why).
>
> Anyway, with ffmpeg I have noticed some voice sync problems with the
> MediaMVP.  The picture looks fine.  Playback on a PC using either the ASX
> stream from MythWeb or using MythTVPlayer on widows is fine.
>
> Appreciate any advise available for a better transcoding method!!!
>
>
Everything you need should be in the wiki. I know that nuvexport is a
popular choice: http://www.mythtv.org/wiki/Nuvexport
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