[mythtv-users] Everything works on my rebuilt DVR except the tuner cards. Help?

[Karl Newman]

On Wed, Oct 16, 2013 at 6:23 PM, Stephen Worthington <
stephen_agent at jsw.gen.nz> wrote:

> On Wed, 16 Oct 2013 14:45:12 -0700, you wrote:
>
> >On Wed, Oct 16, 2013 at 12:46 PM, Rajil Saraswat <rajil.s at gmail.com>
> wrote:
> >
> >> >> Yes, your deduction is correct. The main card works fine in 3.10.7,
> it
> >> is
> >> >> only the daughter card which is broken.
> >> >
> >> > Have you done a git bisect to determine which commit caused the
> breakage?
> >> > That would be helpful to the developers, I'm sure, so they could find
> the
> >> > cause more easily.
> >> >
> >> > Karl
> >> >
> >>
> >> The results of the git bisect are here
> >> http://www.spinics.net/lists/linux-media/msg68963.html
> >>
> >> wm8775 seems to be the culprit.
> >>
> >
> >Glad you found it. Thanks for taking that time. Now I hope they can fix
> it.
> >Maybe the fix will also solve the occasional problem I have with minor
> >audio distortion on my PVR-500 using the on-bracket composite input (it
> >sounds tinny and slightly scratchy).
> >
> >Thanks,
> >
> >Karl
>
> Your PVR-500 audio problem is likely the same as mine - the drivers
> seem to have a bug that causes audio to be mixed in from other inputs.
> I have a script that works around the problem, both for recording FM
> radio for my mother with her PVR-150 and for me recording S-Video from
> my STB with my PVR-500.
>
> This is the fix script for recording S-Video from my PVR-500
> (ivtv_audio_fix.sh):
>
> #!/bin/sh
>
> # Workaround for bug which causes audio distortion on some recordings.
> # From http://urlgrey.net/?p=231
>
> sleep 3
>
> if [ $# -eq 0 ]; then
>     device=/dev/video0
> else
>     device=$1
> fi
>
> # First, set the audio input in turn to each of the unwanted audio
> inputs.
> # This only became necessary as of Mythbuntu 12.04.
> v4l2-ctl -d$device --set-audio-input=2
> v4l2-ctl -d$device --set-audio-input=0
>
> # Next, also set the tuner frequency.  This also seems to be necessary
> # since Mythbuntu 12.04 to suppress a slightly different audio
> distortion.
> # The frequency should be for an unused part of the spectrum, as the
> unwanted
> # audio is coming from whatever the TV tuner is tuned to.
> v4l2-ctl -f 420
>
> # Reset the audio input to source 1 (the wanted input).
> v4l2-ctl -d$device --set-audio-input=1
>
>
> And this fixed FM recording from my mother's PVR-150:
>
> #!/bin/sh
>
> # Workaround for bug which causes audio distortion on some recordings.
> # From http://urlgrey.net/?p=231
>
> sleep 3
>
> if [ $# -eq 0 ]; then
>     device=/dev/video0
> else
>     device=$1
> fi
>
> # First, set the audio input in turn to each of the unwanted audio
> inputs.
> # This only became necessary as of Mythbuntu 12.04.
> v4l2-ctl -d$device --set-audio-input=2
> v4l2-ctl -d$device --set-audio-input=0
>
> # Next, also set the tuner frequency.  This also seems to be necessary
> # since Mythbuntu 12.04 to suppress a slightly different audio
> distortion.
> # The frequency should be for an unused part of the spectrum, as the
> unwanted
> # audio is coming from whatever the TV tuner is tuned to.
> # DO NOT DO THIS FOR RADIO RECORDINGS
> #v4l2-ctl -f 420
>
> # Reset the audio input to source 1 (the wanted input).
> v4l2-ctl -d$device --set-audio-input=1
>
> The fix script should be called from the channel change script.  Use &
> to make it run in parallel with the channel change script, after the
> channel has been changed.  Here is my channel change script for using
> my PVR-500 with my STB:
>
> #!/bin/sh
>
> REMOTE_NAME=Pace_RC-30
> cmd="$1"
>
> # If things work OK with sleep 1, try this for faster channel changes:
> # sleep 0.3
> sleep_amt=1.0
>
> # See if this helps with missing digits at the start of a channel
> change.
> sleep 1.0
>
> #echo Change channel: $cmd >>/tmp/irsend.txt
>
> case $cmd in
>     [0-9]*)
>     # make sure we unmute by hitting vol up
>     #/usr/bin/irsend SEND_ONCE $REMOTE_NAME Vol+
>     #sleep $sleep_amt
>     for digit in $(echo $1 | sed -e 's/./& /g'); do
>             #echo irsend SEND_ONCE $REMOTE_NAME $digit
> >>/tmp/irsend.txt
>         /usr/bin/irsend SEND_ONCE $REMOTE_NAME $digit
>         sleep $sleep_amt
>     done
>     ;;
>
>     *)
>         /usr/bin/irsend SEND_ONCE $REMOTE_NAME $cmd
>         ;;
> esac
>
>
> # Workaround for bug which causes audio distortion on some recordings.
> /usr/local/bin/ivtv_audio_fix.sh $video &
>

Interesting. Thanks for the script; I'll try it out. Do you know if this
bug has been reported upstream? One question--You are passing $video to the
ivtv_audio_fix.sh script, but I where does it get set in the channel change
script?

Karl
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