<div class="gmail_quote">On 18 August 2011 16:03, Ross Williamson <span dir="ltr"><<a href="mailto:ross@inertia.net.nz">ross@inertia.net.nz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div class="im">> There has been talk on the mythtvusers list in the last 6 months (?)<br>
> about improved messages for UK transmissions which seem to have<br>
> similar problems, I think audio was part of the detection method.<br>
<br>
</div>Thanks Nick. I have located the method in question, located here:<br>
<a href="http://www.mythtv.org/wiki/Silence-detect.sh" target="_blank">http://www.mythtv.org/wiki/Silence-detect.sh</a><br>
<br>
It's a hack (obviously) that checks for 120ms of silence anywhere in<br>
the audio stream. The hack could be used for other methods of audio<br>
detection though. I wonder if some software could be used to detect<br>
periods of highly compressed audio (in the sound sense, not in the data<br>
sense) and work in a similar way.<br>
<font color="#888888"></font><br></blockquote></div><br>Interesting discussion...! I used to use the notify only but have gone back to automatic skipping as it seems to be (HD streams included) quite reliable. The important setting change I think for us was to set the maximum commercial skip duration to 300 seconds (5 minutes) which catches all the regular 4 minute breaks but doesn't allow it to miss the end of a break and skip to the beginning of the next one. <br>
<br>Having said that, it does consume an enormous amount of horsepower to realtime flag HD - I have a 2U server with dual 3ghz Xeons crunching up to two streams at once and it gets the load average into the 7s. AFAIK I am just using the default settings (but have been upgrading this database since 0.16 so who knows), the only change I have consciously made is that described above.<br>
<br>Most of our programmes come off 1, 2, 3, FOUR or Prime; these seem reasonably good. The stuff we get off UKTV or Discovery from Sky not so much, but I have not had a chance to tune the PVR150 settings to get the quality up to a point that it's comparable to an SD feed off Freeview. I think it would improve with better picture quality.<br>
<br>Duncan<br>