[MEncoder-users] Video bitrate 104857 kbps, video GOP is too long.

[Brian Keener]

Nico Sabbi wrote:

> Brian Keener wrote:
>
>> That's what TMPGenc DVD Author reports when I try to add the file to 
>> a new project.
>>
>> mencoder tv.avi -fps 30000/1001 -ofps 30000/1001 -of mpeg -oac lavc 
>> -ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=7000:keyint=15 -vf 
>> harddup,hqdn3d,pp=md,scale=720:480 -mc 0 -o tvout.mpg
>
>
>
> it's the opposite: it's too short for NTSC, that requires 18 frames 
> for GOP.
> Those messages are harmless, but you can still override the video bitrate
> setting -mpegopts format=dvd:vbitrate=7000.
> BTW harddup should be the last filter afaik, and adding :mbd=2 to 
> -lavcopts will
> produce a better looking encode.

The mpegopts parameter you suggested eliminated the warning from tmpgenc 
dvd author; thanks for the hint.

There are also ffmpeg options for format= and vbitrate=, and since I'm 
using the libavcodec from ffmpeg, I'm confused as to whether those 
paramaters are being passed to libavcodec, or are processed internally 
by mencoder.  What would happen if I had vbitrate=7000 in my -lavcopts, 
and vbitrate=4000 in my -mpegopts parameter?

Brian K