[mythtv-users] MythArchive: No sound on DVD - couple of bugs

Roy Lofthouse lofty69 at gmail.com
Sat Sep 23 20:33:02 UTC 2006

On 23/09/06, David Scammell <davescammell at gmail.com> wrote:
> Hi,
> I found a couple of bugs, one is in the file, silence.mp2, which as you
> may imagine is silence but for 5 seconds, its encoded at compact disk
> friendly 44.100Khz, not at DVD friendly 48000Khz. I re-made mine with
> these commands:
> arecord -f dat -twav -d 5 /tmp/silence.wav
> mp2enc -r 48000 -o /tmp/silence.mp2 </tmp/silence.wav
> su - (password)
> cp /tmp/silence.mp2 /usr/local/share/mythtv/mytharvice/music/silence.mp2
> It appeared to be causing errors in the mythburn.log when replexing the
> video, these may of been harmless, but still a bug.
> The other bug is more serious at least for me and will account for a
> proportion of the dvd's with no sound issues. The introductorary videos, in
> particular file pal_mythlogo_intro.mpg has AC3 sound, unlike the other two 2
> pal intro's which have mp2 sound. When the final dvd is remultiplexed
> together the AC3 soundtrack from the intro video is made into the primary
> audio track on the dvd. The remaining audio on the dvd, for me in the UK is
> MP2 from the DVB-T telly, gets encoded as the 2nd audio track on the dvd.
> This results in a dvd that appears to have no sound after the intro videom,
> unless you know to switch soundtrack. I suspect that its non-standard to mix
> both types of audio coding on one dvd but I don't know for sure, perhaps its
> my mplex or perhaps there is another way around this. My quick fix was to
> copy pal_mythtv_into.mpg over the top of pal_mythlogo- intro.mpg.
> I haven't read that these bugs have already been found, then again I might
> of missed them on the lists, i'm not up to date with the svn, about a week
> adrift.
> regards
> dave s
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> mythtv-users at mythtv.org
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> Hi Dave,

I'm having similar issues, but I've also noticed that the problem of having
to switch audio tracks is happening to me when doing a lossless mpeg2
transcode in myth...all the commercials are cut, but when I play the file in
myth I have to manually switch audio track..not sure if it's this that is
causing mytharchive to burn the dvd incorrect as well??

Any chance you can transcode some of your recordings and see if you have to
switch the audio track afterwards??


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