Further tests seems to suggest that using --transcode
with a single pass and no noise reduction gives virtually
identical picture quality as transcode with multi-pass and
noise reduction.
Contrary to what most people think, the only REAL advantage to multipass
is that it provides a consistent (nearly guaranteed) output file size,
and the best possible quality for that size. Single pass can have
awesome quality, but if you were to tweak things such that the single
pass produced a file of the same size as the two-pass file, the two-pass
one might look slightly better because it would have had a smarter
"insight" into which frames should be encoded at a higher bitrate, and
which ones didn't matter (eg. black frame) and could be encoded lower.
The run time on that is 1h 28 minutes (still twice ffmpeg's time)
and it plays perfectly in xine, mplayer, kaffeine, vlc. and
Windows Media Player 9 and later. It shows
slight jerkyness in Winamp and Windows DivX Player
(older version).
Really strange. In all of my tests, ffmpeg and transcode (with noise
reduction enabled) were almost exactly the same speed (about 6 fps for
me). I put up with the slowness, though, since whenever I've tried to
use ffmpeg the output is full of artifacts.
Now if I can just get the command line to work so
I can run these nuvexport jobs from the backend I'll be happy.
/etc/nuvexportrc plus:
nuvexport --transcode --require_cutlist --mode xvid --title some_title
personally, I wouldn't trust it, though. Too many things can go wrong.
You might also want to add the --force_mythtranscode option since I've
seen transcode freak out with some ivtv recordings.
-Chris
_______________________________________________
mythtv-users mailing list
[email protected]
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
