[mythtv-users] Transcoding 101
Rod Smith
mythtv at rodsbooks.com
Fri Aug 1 22:49:40 UTC 2008
On Friday 01 August 2008 05:51:37 pm 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?
Both are lossy formats, so yes, a conversion will reduce the quality. How much
depends on your settings.
> 2) How much space does it save? 10%, 50%?
That depends on your settings.
> 3) Can MPEG-4 recordings be played via MythTV Watch Recordings?
Yes.
> 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)?
I don't believe you need to re-run commercial flagging, at least not if you
use MythTV's built-in transcoding functions.
--
Rod Smith
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