[MPlayer-dev-eng] help, uncompressable video stream

[D Richard Felker III]

On Thu, Mar 20, 2003 at 10:10:21PM -0600, Joey Parrish wrote:
> On Thu, Mar 20, 2003 at 10:09:26AM +0100, Michael Niedermayer wrote:
> > hmm what filesize do u get for each of the following, 2.6G is really a bit 
> > huge, perhaps its a bug ...
> > -lavcopts vcodec=mpeg4:vqscale=31
> > -lavcopts vcodec=mpeg4:vhq:vbitrate=400
> > -lavcopts vcodec=mpeg4:vqscale=31 -ssf lgb=1 -ssf cgb=2 -vop scale
> > -lavcopts vcodec=huffyuv:vstrict=-1:vpass=1:pred=2 
> > -lavcopts vcodec=huffyuv:vstrict=-1:vpass=2:pred=2
>             ^^^^^^^^^^^^^^
> 	    Please add this to the manpage!!  I never tried it because
> 	    it's not documented under vcodec.
> 
> Okay, here are the results for a very few frames. (100 from the middle.)
> I will run it on a larger sample later, but I have a very slow computer
> and very little drive space left.  So, for 100 frames (3.3s at 680x332):
> 
> -lavcopts vcodec=mpeg4:vqscale=31   3.3M 
> -lavcopts vcodec=mpeg4:vhq:vbitrate=400    15M 
> -lavcopts vcodec=mpeg4:vqscale=31 -ssf lgb=1 -ssf cgb=2 -vop scale   696k 
> -lavcopts vcodec=huffyuv:vstrict=-1:vpass=1:pred=2   8.0k 
> -lavcopts vcodec=huffyuv:vstrict=-1:vpass=2:pred=2    14M 
> 
> The blurred version is smaller, but the blur makes the use of ascii
> unrecognizable, which defeats the purpose of using it.  :)
> 
> The huffyuv pass1 version produced garbage.  Is this normal?
> http://joey.nicewarrior.org/huff.jpg (cropped, lq, ~10kb)
> 
> The huffyuv pass2 version looked normal.
> 
> 1Mb per second seems to be our best result so far without blurring the
> video stream.  Does this tell you anything useful?  Do you think it's a
> bug, or have I just tried to do something silly?

Very silly. You'll have the same results if you try to compress a
single scene from the Matrix where the whole screen is the 'matrix
text' stuff, or similarly the opening credits of Ghost in the Shell.

Anyway, you can try using a lower but nonzero amount of blur (maybe
0.2-0.5) and see if that works. But it makes much more sense, if you
want to display the ascii version, to just run mplayer -vo aa or
whatever. :) Maybe you could even do mplayer -vo aa ... > foo.txt
then put a 'home' character after every page of text. Then you should
be able to cat foo.txt to a tty to watch the movie.

Rich