[mythtv] [mythtv-users] HD/SD Transcoding setup

Jeremy Silber jsilber at gmail.com
Sat May 27 16:23:54 UTC 2006

The fundamental problem with this approach is that the user has to
manually specify which transcoding profile they want based on the
source content type... which means you have to have separate recording
profiles for the same show occurring on different channels, and you
have to know which channels are in 720p, 1080i, etc.  I think a better
solution would be either:
1. mythtranscode realizes what format a recording is in, and can use
this information to choose which transcode profile to use (for
example, you could have a "perfect", "high quality", and "low quality"
transcode profile from each source format.
2. allow transcoding based on the channel that was recorded, not just
the show that was recorded.  Assuming that individual channels are
always in the same format, this accomplishes the same thing as #1.

Failing this, it would be nice if there was some way inside MythTV to
see the format for each recording (an little 1080i/720p/480i/whatever
icon in the "All Recordings" and "Delete Recordings" screen, perhaps.)


On 5/26/06, Brad Templeton <brad+myth at templetons.com> wrote:
> Thanks for writing this up.   If you are handy in Perl, you may want to
> pull out my mythlib.pl from tvwish, which allows you to write easy
> perl scripts to manipulate the myth database.   It worries about finding
> the mysql.txt file to open the database, and you can then do the
> calls.   Thus you could write a simple script to add a new transcode
> profile for people.
> One of the types of transcode I think is particularly useful to do
> is one from 1080i to 720p.   That's because my TV is 720p and I run
> it at 720p, so there's no point (unless I am archiving for future
> watching on a 1080 line set) at storing a show at 1920x1080.
> This is effectively "lossless" as far as watching is concerned, at
> least in resolution.  (true transcoding will always introduce loss.)
> This makes sense as an "always do" for 1080i shows (though best to
> do it in the middle of the night so you only do it on shows you don't
> get to that day).   Reducing below 720p is more of a choice to save
> space by deliberately degrading the show.
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