[MPlayer-users] 2nd pass failed to converge (and crashes)

[D Richard Felker III]

On Wed, Feb 25, 2004 at 06:23:49PM +0100, Mario Valle wrote:
> I'm encoding with mencoder 1pre3 an MPEG4 movie starting from JPEG images.
> With a particular set of at least 14 images, the 2nd pass crashes
> after saying:
> [mpeg4 @ 0x854d0e0]Error: 2pass curve failed to converge
> Could not open codec.
> FATAL: Cannot initialize video driver.
> Pos:   0.0s      1f ( 0%)   0fps Trem:   0min   0mb  A-V:0.000 [0:0]
>  Pos:   0.0s      2f ( 0%)   0fps Trem:   0min   0mb  A-V:0.000 [0:0]
> 1 duplicate frame(s)!
> ...
> one for each frame
> 
> the command is:
> 
> opt="vbitrate=1280000:mbd=2:keyint=132"
> mencoder -ovc lavc -lavcopts vcodec=mpeg4:vpass=1:$opt -mf 
> type=jpg:w=512:h=512:fps=25 -nosound -o /dev/null mf://*.jpg
> mencoder -ovc lavc -lavcopts vcodec=mpeg4:vpass=2:$opt -mf 
> type=jpg:w=512:h=512:fps=25 -nosound -o output.avi mf://*.jpg
> 
> 1) What does it means? Scene too complex? Too much changes?
> 2) Except to change to one pass encoding, is there anything that I should 
> do?
> 3) Isn't better to exit immediately after detecting the convergence 
> failure? Continuing is
>    pointless.
> 4) Should I upload the images and encoding script for further analysis?

You should probably upload, but my guess is that 14 frames is WAAAAY
too small for 2pass to work properly.

Rich