AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name);
to:
int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name);
This way it is possible to propagate an error code telling the reason
of the failure.
Originally committed as revision 24765 to svn://svn.ffmpeg.org/ffmpeg/trunk
target regtest-lavfi_pix_fmts.
The lavfi_pix_fmts test is disabled, this because there are
many tests which are failing, and there are still some output files
which cannot be played by NUT/ffplay.
Originally committed as revision 23297 to svn://svn.ffmpeg.org/ffmpeg/trunk
