[MPlayer-users] Re: Audio & video file sizes don't add up to actual file size (mencoder)

[D Richard Felker III]

On Wed, Jun 23, 2004 at 03:40:10PM +0200, nix.wie.weg at gmx.de wrote:
> As far as I know you have in mpeg4 a overhead of 45 Bytes per frame.

This is irrelevant; that's part of the video size. The question at
hand is AVI overhead.

Rich

> This means 45Byte *161874 Frames = 7284330 Byte ~= 6.9 MB
> The Rest is Index + Header Information.
> 
> Tino!
> 
> Pit Cuppens wrote:
> 
> >Here are some more details: I called mencoder with the following
> >options:
> >
> > ~/sw/mplayer-1.0pre4/bin/mencoder dvd://1 -dvd-device VIDEO_TS/ -o 
> >movie.avi -alang en -vf crop=720:436:0:70,scale=416:-3 -oac lavc -ovc lavc 
> >-lavcopts acodec=ac3:abitrate=128:vcodec=mpeg4:vbitrate=767:vhq:vqmin=2:
> >v4mv:trell:autoaspect:vlelim=-4:vcelim=9:lumi_mask=0.05:dark_mask=0.01:
> >vpass=2 -endpos 6480
> >
> >(As you can see, this is pass 2; I encoded pass 1 with
> >precisely the same options, with the only difference
> >that I use "-oac copy" and "vpass=1" in the first pass.)
> >
> >The output of pass 2 (just before exiting) is:
> >
> > Video stream:  683.068 kbit/s  (85383 bps)  size: 552851566 bytes  
> >6474.920 secs  161874 frames
> > Audio stream:  128.000 kbit/s  (16000 bps)  size: 103606272 bytes  
> >6475.392 secs
> >
> >So the sum of the two sizes (after "size:") is 656457838; while
> >the actual file size is 665284436. That is an 8MB difference.
> >
> >Is this normal? Is one of the options the problem?
> >
> >Many thanks,
> >Pit
> >
> > 
> >
> 
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