[MPlayer-users] MEncoder and file sizes

[Robinson, Chad]

OK, I stipulate that I don't know a lot about what I'm doing, but RTFM'ing
isn't helping me here.

The bitrate of 1500 was only one of the three examples. In another, I used
1100. Yes, the source is 1100 (video) also. But, my understanding was that
this means there should be little change in quality. I don't really want to
have my bitrate much below 1100, do I?

This video was converted by some yahoo on the Net into a DiVX with the same
visual quality at 50MB. That's roughly a 5:1 compression ratio. To get that
just by dropping the bitrate I would expect the bitrate would need to be
around 220! That's really low! I tried it, and did indeed get a small file,
but VERY poor quality. Hell, I can do that just by resampling the MPEG
source at a lower bitrate, without using MEncoder, and in a fraction of the
time.

So, the question is, how did that guy get HIS file to 50MB? I thought this
was the whole point behind DiVX. Am I just an idiot? I can accept that, but
only if it's true. :-)

-----Original Message-----
From: Arpi [mailto:arpi at thot.banki.hu]
Sent: Friday, November 16, 2001 3:12 PM
To: mplayer-users at mplayer.dev.hu
Subject: Re: [MPlayer-users] MEncoder and file sizes


[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html &
 http://gcc.gnu.org/gcc-2.96.html if you still have questions or problems]

Hi,

> Well, I finally got mencoder to compile, after reinstalling with the
latest
> version of Slackware. Looks very good, and thank you for this - I got a
> 1.8GB MPEG camcorder file down to around 800MB with this.
> 
> However, I'm having a bit of a problem. I have a bunch of half-hour,
> VCD-ready MPEG files at around 220MB each. When I run Mencoder on them,
> surprise surprise - they get LARGER! I've tried:
> 
> Source file:
> -rw-r--r--    1 root     root     229271896 Nov 15 11:27 507.mpg
> 
> /usr/bin/time mencoder 507.mpg -v -ovc divx4 -oac mp3lame -divx4opts
br=1500
> -lameopts br=128 -o 507.avi -pass 1

why are you surprised? vcd bitrate is around 1120, and you choose a bigger
value, 1500


A'rpi / Astral & ESP-team

--
mailto:arpi at thot.banki.hu
http://esp-team.scene.hu
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