[mythtv-users] mythtranscode sometimes breaks sound

Michael Zanetti michael_zanetti at gmx.net
Sat May 22 10:26:51 UTC 2010

Hi all,

Lately I decided to transcode some of my recordings to mp4 to save some disk 
space. I modified the "Low quality" transcoder preset to the following 

Codec: MP4
Bitrate: 1000 kb/s
Sound: MP3
Samplerate: 44100
Volume: 100%
Everything else is left at its default value.

This seems to compress a movie from the original 3GB to about 1GB with still 
quite good quality. However, now that I have transcoded some of my recordings, 
I noticed that this sometimes breaks sound. Sound is still there, but pitched 
down. It's like the sound would play only half of its speed while the video 
plays at its correct speed.

Note, that not every transcoded movie is broken. Only about every 5th one. Is 
this a bug in mythtranscode or my owns fault in configuring the transcoder?

Anyone has an idea how to repair those movies or are they lost forever? I 
already tried re-transcoding using a the "lossless" setting for mythtranscode. 
Doesn't fix the sound though...

Thanks in advance,

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 198 bytes
Desc: This is a digitally signed message part.
URL: <http://mythtv.org/pipermail/mythtv-users/attachments/20100522/6fddeda5/attachment.pgp>

More information about the mythtv-users mailing list