Paul V. Gratz wrote:
I have a treo 650 and I've encoded a few shows for it. I have been
using mencoder to encode it to the built-in lavc endcoder for divx.
In my understanding divx is an early implementation of mpeg4 (prior to
the release of the standard). Xvid is another. I'm not sure what the
relative differences are but I think they more or less amount to the
same kind of quality per bitrate. Now that mpeg4 is out I think they
both produce legal mpeg4 output.
OK, so I might be better to look at mpeg4. It seems to be well supported.
I get much better performance using mencoder (part of mplayer). Its
something like 15-20 minutes to encode a 1 hour program on my P4 2.8Hz
HT machine.
That's fast.
I use nuvexport to give me the raw *.nuv file
What is a raw *.nuv file? I feed the nuv files, as recorded, straight
into ffmpeg. It can handle the mpeg2-TS directly.
then I
run mencoder on that file to re-encode for my palm machine. Here is
the mencoder command line I use:
(I use nuvexport not mythtranscode)
mencoder -o outfile.avi -aspect 4:3 -ovc lavc -lavcopts
vcodec=mpeg4:mbd=2:turbo:vbitrate=300:aspect=4/3:acodec=mp3:abitrate=96
-oac lavc -vf-pre pp=lb -vf scale=320:200 -af volnorm infile.nuv
Replace outfile.avi and infile.nuv with the input and output files you
want. The resultant file is ~150MB for 1 hour. The quality is very
high so you could probably halve the 300kbs bit rate and still have a
usable video if you want smaller files.
Yes. 150kbs is a low end point for me - barely good enough, but 200
kbps and up are good.
The assumption is that you are going from a full screen TV program to
a full 4:3 aspect ratio output file. You can get slightly better
quality if the program is 16:9 and you crop it but it may be more pain
than its worth (look at the mencoder man page for the info on
autocrop).
Mine are all 16:9 natively
I will be comparing mencoder, especially as you report very good speed.
Thanks.
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