[mythtv-users] mythtranscode sometimes breaks sound

Rod Smith mythtv at rodsbooks.com
Sat May 22 13:54:05 UTC 2010

On 05/22/2010 06:26 AM, Michael Zanetti wrote:
> 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 
> settings:
> 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.

I've had this problem, too, but only on one of my two backends (the one
that runs Ubuntu 9.10; the one that runs Gentoo is fine) and only on
videos that have 5.1 audio. If the original source has 2-channel audio,
it's fine. This problem has persisted for ages.

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