[mythtv-users] Transcode script for pillar boxed SDTV broadcasts on HDTV
patrick at wagstrom.net
Tue May 29 19:17:49 UTC 2007
Steve Greene wrote:
> Everyone has probably seen pillarbox broadcasts on HDTV. Because of the
> upsampling, they are still better than the analog broadcasts. Does
> anyone have a script to eliminate the pillar box and create DVD-ready
> files? Are the developers working on a solution for MythDVD?
see ticket 2581 for something quite related
I'm partial to this, because I wrote the patch and filed the bug.
Basically, it allows you to define multiple transcoders that have a set
aspect ratio. For example, if you set the transcoder to be 4:3 ratio
and if it gets 16:9 input, it will just take the middle portion of the
screen and cut off the pillarboxes. If it's 4:3 input, it leaves the
ratio unchanged. Likewise, it works in reverse and can compensate for
letterboxed content broadcast in 4:3.
The videos are then transcoded just like any other video is transcoded
within MythTV. Just flag the commercials, then tell it to transcode
using autodetect. So, if DVD export works for MPEG4 on your system,
then you'll get the correct aspect ratio.
I've been using it for the last 8 months on my system and my analog
tuner is now idle most of the time, the SD over HD is just better.
Of course, as a downside, not everything is exposed in the UI, but it's
a start. I utilize a cronjob that periodically goes and changes the
transcoders for shows that I know to be pillorboxed. For other
programs, I need to go in by hand and do some SQL hackery, but I can
share the script if folks want it. Here's hoping that mentioning it
will give the patch another kick for the devs and other folks to look at it.
 Provided you've run the script I mentioned later in this email. I
tried to hack up a UI that allows you to actually pick your transcoder,
but at the time the transcoders were hardcoded and each had separate
functions in the source. It burned my eyes and I figured I could do it
with a shell script faster.
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