[MPlayer-users] Re: failed to compile mplayer(cvs) with xvid

[Corey Hickey]

yong wrote:
>> Ok, here's try 3. This compiles and works for me on mingw. It appears
>> that libavcodec xvid encoding (all xvid, not just the ratecontrol) was
>> broken on MinGW. The patch fixes that as well.
>>
>> For the record, the problem with my last patch was that, unlike
>> mkstemp(), tempnam() doesn't actually create a file -- it just returns
>> the name. I never bothered to put in an O_CREAT because the old code
>> didn't have on either, which is why xvid+mingw didn't work before.
>>
>> Please test this with whatever you want to throw at it. Bear in mind
>> that:
>> (a) vrc_strategy=1 is (for now) ignored for the first pass
>> (b) xvid likes the first pass to be constant-quantizer (vqscale=2)
>>
>> The existence of (b) makes (a) not much of a problem; at a constant
>> quantizer, I think, the only real difference is the frame type
>> decisions, but I haven't determined experimentally whether that is
>> true or not, and, either way, how much is affected. Maybe this
>> weekend...
>>
> Ok i tested something like this:
> -nosound -o nul: -ovc lavc -lavcopts vcodec=mpeg4:autoaspect:
> vmax_b_frames=2:vpass=1:vb_qfactor=1.50:vb_qoffset=1.00:vbitrate=600
> :vb_strategy=1
> :turbo -passlogfile "fmp4.txt"
> 
> -audio-preload 2.0 -o "%userprofile%\desktop\%~n1.avi"
> -ffourcc mp4v -oac copy -ovc lavc-lavcopts vcodec=mpeg4:autoaspect
> :keyint=300:vmax_b_frames=2:vpass=2
> :vb_qfactor=1.50:vb_qoffset=1.00:vbitrate=600:predia=2:dia=2:preme=2:trell
> :mv0:mbd=2:qprd:cbp:v4mv:naq:lumi_mask=0.3:dark_mask=0.3:p_mask=0.1
> :vrc_strategy=1 -passlogfile "fmp4.txt"
> 
> Since you said vrc_strategy doesnt work in 1st pass,
> i put it at 2nd pass,
> but mencoder ignored the vbitrate=600, resulted the 2ndpass video
> encodes at 1800kbps++ for 320x240 resolution...
> Am i doing something wrong?

I don't see anything wrong from here. I would suggest trimming down your 
command lines some -- remove all the unnecessary options you can and see 
if the problem goes away. If it does, try selectively adding and 
removing options until you come upon the one(s) that cause trouble.

Eventually, when you figure it out, we may need access to your source 
file, or at least enough of it to reproduce the problem. Use dd to trim 
it down to the smallest portion you can reproduce the problem with, and 
upload the small file to ftp://www.mplayerhq.hu/MPlayer/incoming

Oh yeah, also: make sure you have current libavcodec CVS. There was a 
bug with B-frames and xvid rc that I reported and Michael fixed already. 
If that's the case, ignore the preceding paragraphs.

Thanks for testing my patch. I'll submit it for review to ffmpeg-devel 
later today, when I have time.

-Corey