[mythtv-users] Transcoding 101

jedi jedi at mishnet.org
Sat Aug 2 01:42:25 UTC 2008


On Fri, Aug 01, 2008 at 09:51:37PM +0000, moodyjunk at frontiernet.net wrote:
> Before going through the bother of setting up transcoding I need some  
> basic information comparing MPEG-2 to MPEG-4 and can't seem to find it  
> on the web.  I'm all for saving space, but I want a loss-less recording.
> 1) Does transcoding from MPEG-2 (HD cable) to MPEG-4 reduce the  
> quality of the recording?

Yup.

> 2) How much space does it save?  10%, 50%?

It all depends on how much quality you are willing to sacrifice.

You can easily increase your effective space by 2x or 4x.

> 3) Can MPEG-4 recordings be played via MythTV Watch Recordings?

You might want to be more precise than just "MPEG4" but yes,
MythTV has no problem playing compressed recordings.

> 
> Just out of curiosity once transcoded do I need to re-commercial flag  
> (don't know if the tags are offsets into the files or even direct  
> cylinder/head/block addresses)?

Nope. No need to reflag.


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