[mythtv-users] Should I be transcoding? UK DVB-T

Ian Barton lists at manor-farm.org
Sat Jan 5 15:29:45 UTC 2008

>> Should I be transcoding?
>> To reduce file size?
>> To make playback easier on the Epia?
>> To remove those pesky blips and glitches when it's really windy/sporadic signal?
>> Is it time to experiment with commercial detection? (Something which
>> would probably end up with me getting obsessive about it and
>> relearning c++..)
> I've got a similar set up and use lossless transcode, It reduces file
> size by ~15% and is very fast. I did try transcoding to MPEG4 but those
> pesky blips and glitches cause the audio/visual sync to gradually slip.
> Wrecked Mary Poppins and I had to wait months for it come around again.
> Commercial detection would be great if you can do it but changing the
> right/left buttons to skip 29s is pretty good (those commercials are
> charged by the microsecond so they get exactly what they pay for).
If you do the lossless transcode *before* you convert to np4 it should 
fix your audio sync problem. For some reason Myth introduces a short 
delay between the audio and video tracks. You won't normally notice 
this. However, if you transcode or edit an mpg the sync gets really 
messed up.

Doing a lossless transcode fixes the sync, so you can trancode/edit as 
much as you want.


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