Jason Wertz on Mon, 19 May 2003 11:07:05 -0400


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Re: [PLUG] using mencoder for Archos Jukebox


If you're using 3 pass encoding you'll need this option for each pass. 

Add -ofps xx where xx is the desired fps that you want. You'll need to
play with this as some settings seemed to actually make my files bigger.
I saw somewhere that you should only half the framerate for best results
(for dvds it's typically 30 to 15, 24 to 12) and this seemed ok for me. 

I've been ripping and encoding movies for my Zaurus and have had pretty
decent results at really high compression. Another issue I've heard
about is the vbr versus cbr mp3 audio...I've been using cbr. I'm also
guessing that 128k mp3 is too high for the device...I don't know what
processor it has but it can't be too much better then the Zaurus. Try 64
or 32 for the audio, you'll be surprised it isn't as bad as you think for 
movies and you'll be less likely to get dropped frames.

Jason Wertz
Senior Technology Specialist / WebMaster
Delaware County Community College
ph: 610-325-2771
fax: 610-325-2820
http://learn.dccc.edu/~jason




>>> jlavin@linuxtech.com 05/18/03 05:30PM >>>
gabriel rosenkoetter said:
> Aha. And have you experimented with various settings? I bet that's
> part of Archos's "standard".
Yeah - I've tried various settings - one thing that kills me is that if
I turn down the bit rate to a lower setting in hopes that its just too
much, the frames per second goes up past 30 and I _know_ that's too
high...  If there's a way to keep the fps down and reduce the bitrate,
I'd love to hear it.

> Have you been able to produce video that'll play on the thing under
> windows? Can you play that with mplayer and find out exactly what
> format it's in?
I can't say - I haven't had a windows partition in years...

They do ship some canned videos on the device and here are a few
snippets from mplayer's output:

VIDEO:  [DX50]  352x160  24bpp  25.00 fps  1132.9 kbps (138.3 kbyte/s)
...
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffodivx] vfm:ffmpeg (FFmpeg MPEG-4)

I don't see any other relevant info in the output.

> How much you want to bet that's what Archos means by standard?
Before I tried encoding in that format, I would have bet a lot!!  Unless
some other setting is wrong - like the vbitrate - that wasn't it.

-john
-- 
John Lavin <jlavin@wayreth.net> http://www.wayreth.net                  ,''`.
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