[XviD-devel] Fairly stupid xvid API newbie question

[Christoph Lampert]

Hi,

nice test application. If you decide to release the source as GPL, we 
might include it into the examples-dir. 

>From the m4v output (e.g. with mplayer test.m4v  -lavdopts debug=1 
you could see that it was a ratecontrol problem (quantized kept jumping 
from 1 to 31) which was caused by wrong entries in one of the xvid 
structs.
For xvid, you have to set all unused values in all structures to 0, or the 
result can be unexpected. Best is to simply initialize everything to 0 
before writing the values, like 

  xvid_enc_frame_t        frame;
  xvid_enc_stats_t        stats;
  memset(&frame,0x00,sizeof(frame));
  memset(&stats,0x00,sizeof(stats));
  stats.version = XVID_VERSION;
  frame.version = XVID_VERSION;
  ...

and the same in the constructor etc.
  memset(&_xvid_1pass,0x00,sizeof(_xvid_1pass));
  memset(&_xvid_enc,0x00,sizeof(_xvid_enc));
  memset(&_xvid_plugins,0x00,sizeof(_xvid_plugins));

Then it worked for me. 

chl



On Sun, 11 Jul 2004, Bernhard Rosenkraenzer wrote:
> Sorry for the newbie (in xvid API, not usage) question:
> I'm trying to write a simple mpeg4 generator (generates m4v stuff from
> commands).
> The small sample I've attached works, but produces a horrible quality, even
> though I'm allowing bitrates of 1 MBit/s.
> 
> I'm sure I'm doing something really stupid wrong there, but can't find it -
> can anyone take a look?
> 
> Thanks,
> bero
>