[mythtv-users] custom mytharchive recording profile
Mark J. Small
msmall at eastlink.ca
Fri May 2 18:01:26 UTC 2008
I've been playing a bit with mytharchive, and have been pretty happy with the
results. However, I'm trying to make a custom recording profile, and would
like a few more details.
I've copied ffmpeg_dvd_ntsc.xml in to .mythtv/MythArchive/
I've added the following profile in the hopes of creating a good 3 hour/dvd
option. It's basically a copy of the EP profile, except for the bitrate
and -b options. These are the averages of the SP and the EP values.
<description>Mark's custom play profile giving approx. 3 hour of video
on a single layer DVD</description>
<parameter name="-v" value="1"/>
<parameter name="-i" value="%inputfile"/>
<parameter name="-r" value="ntsc"/>
<parameter name="-target" value="dvd"/>
<parameter name="-b" value="3557k"/>
<parameter name="-s" value="352x480"/>
<parameter name="-acodec" value="ac3"/>
<parameter name="-ab" value="192k"/>
<parameter name="-ac" value="2"/>
<parameter name="-copyts" value=""/>
<parameter name="-aspect" value="%aspect"/>
<parameter name="" value="%outputfile"/>
When I try to select 3 hours of video using these options, I get a DVD size of
4679 Mb, just a little too big. Can I just drop the bitrate and the -b by 5
percent and cross my fingers? What is the relationship between the two?
I understand that the -b parameter is the video bitrate passed to ffmpeg, but
what is the bitrate at the top used for? Why is it so much lower?
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