[XviD-devel] Questions / Bug fixes / Patches

[Marcin Jaworski]

Quoting Michael Militzer:
> Hi,
>
> I don't agree. According to my understanding, the allowed value range for
> frame_drop_ratio is [0, 100] in xvid API (see xvid.h). Negative values are
> not legal and are clipped to zero in l. 264 of encoder.c. Therefore, your
> proposed patch will have no effect.
>
> If we want to disable the creation of N_VOPs for frame_drop_ratio=0 we
> should apply the patch that was earlier proposed by Carl Eric Codere.
>
> Best regards,
> Michael
>   
Sorry, I forgot to include line 264 of encoder.c in the patch I posted. 
It was copy'n'paste from a larger patch. Here's a corrected patch: 
http://pastebin.com/Sq2uPiHj

I've been using something like that for months and it seems to work 
perfectly (even with artificially created dupes that otherwise caused 
N-VOPs).

Line 1178 of encoder.c uses frame_drop_ratio == -1 to force a coded VOP 
(it causes the "<=" in line 1887 to be always false, which results in a 
coded VOP). Hence my conclusion about "-1" ;-)

So it's not really an official part of the API, but just a hack. Thank 
you for clearing that up.

Best regards,
Marcin Jaworski