<div>-ac channels set number of audio channels<br></div><div>AKA stereo sound. So that isn't what you want.</div><div><br></div><div>This should help you:</div><div><a href="http://libav.org/avconv.html#Stream-selection">http://libav.org/avconv.html#Stream-selection</a><br>
</div><div><br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Dec 4, 2012 at 10:57 AM, John Pilkington <span dir="ltr"><<a href="mailto:J.Pilk@tesco.net" target="_blank">J.Pilk@tesco.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On 04/12/12 15:33, D. R. Newman wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 04/12/12 09:20, John Pilkington wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Can you switch channels on playback? The -ac 2 suggests (to me) that<br>
both channels would be passed.<br>
</blockquote>
<br>
I thought -ac 2 merely told avconv to produce stereo, rather than 5<br>
channel output from a particular audio track, not to use a different track?<br>
</blockquote>
<br></div>
That was a guess. avconv --help and man avconv both drew a blank and I didn't look further. It looked like an audio option. What you describe below is essentially what my script does, for DVB-T, with the option to choose the audio PID. I haven't tried it with DVB-S, I follow it with:<br>
<br>
ionice -c3 mythutil --clearcutlist --chanid "$chanid" --starttime<br>
"$starttime"<br>
<br>
ionice -c3 mythcommflag --rebuild --file $1<br>
<br>
ionice -c3 mythpreviewgen --chanid "$chanid" --starttime "$starttime"<br>
<br>
using --file in the mythcommflag line because it seemed fussy about<br>
the starttime format. The previewgen is optional but I like it there. mythcommflag --rebuild now resets the filesize in the DB, so there's no need to script that.<div class="HOEnZb"><div class="h5"><br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
My solution to the original problem is to run a demux script on every UK<br>
MPEG2 recording. It uses projectx to split into video and audio tracks,<br>
finds the longest audio file, then uses mplex to combine that with with<br>
the video file, producing an MPEG2 file with only one audio track. Put<br>
that into mythexport and all should be well.<br>
<br>
David Newman<br>
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</blockquote>
<br>
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