[mythtv-users] 68% filesize increase after transcode!

Dave Sherohman esper at sherohman.org
Sat Sep 24 17:03:25 UTC 2005

On Sat, Sep 24, 2005 at 10:38:12AM -0600, Greg Grotsky wrote:
> Is RTjpeg not a good compression algorithm? It must be worse then MPEG2,
> since the video was almost exactly 31 minutes and is now 21 minutes and much
> larger in size. I'm not scaling it down (yet) so it's still in it's native
> size but it doesn't seem like that should matter, there's less content. I
> think I'm going to try going to MPEG4, the RTjpeg conversion took about 1:20
> to complete.

When I first set up transcoding, I went with RTjpeg since it was the
default and I saw no significant change in the size of my programs -
about 2.1G/hour before and 1.9G/hour after.  Then I tried mpeg4 and
(with the default settings) that got me 750-800M/hour.  So I'd say
that, if the quality is acceptable to you, mpeg4 definitely looks
like the way to go.

The freedoms that we enjoy presently are the most important victories of the
White Hats over the past several millennia, and it is vitally important that
we don't give them up now, only because we are frightened.
  - Eolake Stobblehouse (http://stobblehouse.com/text/battle.html)

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