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

[nix.wie.weg at gmx.de]

As far as I know you have in mpeg4 a overhead of 45 Bytes per frame.
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
>
>  
>