Tom Metro wrote:
I'm looking to supplement my two analog tuner PVR-500 MythTV setup with
a new tuner to avoid conflicts. I figured while I'm upgrading I'd like
to add a card capable of digital reception, specifically QAM - not
because I'm interested in HDTV, but simply to receive SD to improve on
the steadily degrading quality of my analog cable (clearly they're
ignoring that aspect of the cable plant these days). I'm also aware that
most cable companies carry not much more than the broadcast channels in
unencrypted QAM, but that'll be good enough to resolve conflicts, as at
least one channel will be a broadcast channel.
So what I'm wondering, given the way the MVP hardware is sensitive to
the video format, what QAM digital tuners have others successfully used
with MythTV and mvpmc without going through the hassle of transcoding
recordings?
-Tom
I have an Avermedia AV180 along with my PVR 150 & PVR 250 and Air2pc
OTA card. So, I get analog through the 150/250, OTA ATSC via the air2pc,
and QAM from comcast via my AV180. Here in Colorado Springs, Comcast seems
to be sending their entire analog lineup via QAM. I have also "stumbled"
onto the odd/occasional Video-On-Demand showing, and there seem to be
a few additional QAM channels available, that I don't get via
analog (Great American Country, Horse Racing/Gaming, ToonDisney).
The SD stuff captured via QAM does have audio sync problems because it is
sent using AC3, but I have created a Myth User job that transcodes the sound
down to MP2 using VLC. It does a good job of resyncing, and it does it
pretty quickly. It also turns the TS into a PS. Because I use the MVPMC
exclusively for my myth viewing, commercial cuts aren't as important to me.
What I would really like to do is figure out how to create an automatic
transocding profile for this, so I can attach it to the card, and
auto-magically run it against anything captured by this card. That way
I don't have to either 1) remember to select it when recording by
this card, or 2) worry about which card is capturing when capturing
multiple streams, it just happens. But, that's research for another
week.
There are also 3 or 4 true HD channels available via both ATSC and QAM, and
I will be looking at some options to transcode those down to SD type
content levels, so I can watch that content if I want/need to. But, that
too is something for another day.
#!/bin/bash
logfile=/var/video/tmp/$$.log
logger -ip local7.info "================ starting $@
=============================="
if [ $1 = "-f" ]; then
whole_filename=$2
else
whole_filename=$1
fi
filename=`basename "$whole_filename"`
logger -ip local7.info "filename = $filename"
rm -rf /tmp/$$ 2>/dev/null || true
mkdir /tmp/$$ >> $logfile 2>&1
tmpdir="/tmp/$$"
logger -ip local7.info "starting vlc"
vlc -I dummy -vvv "$whole_filename" --sout-all --audio-language eng --sout
"#transcode{acodec=mp2a,ab=192,scale=1,channels=2,deinterlace,audio-sync}:std{mux=ps,access=file,dst=\"/var/video/tmp/$filename.tmp\"}"
--file-logging vlc:quit >> $logfile 2>&1
if [ ! -z "/var/video/tmp/$filename.tmp" ]; then
logger -ip local7.info "cp'ing /var/video/tmp/$filename.tmp to
\"$whole_filename\""
cp "/var/video/tmp/$filename.tmp" "$whole_filename" >> $logfile 2>&1
logger -ip local7.info "running mythcommflag -rebuild"
mythcommflag --rebuild -f "$whole_filename" >> $logfile 2>&1
fi
logger -ip local7.info "removing /var/video/tmp/$filename.tmp"
rm "/var/video/tmp/$filename.tmp" >> $logfile 2>&1
rm -r /tmp/$$ >> $logfile 2>&1
logger -ip local7.info -f $logfile
rm $logfile
logger -ip local7.info "================ finishing $@
=============================="
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