Allow setting a wider range of chroma QP offsets

This allows use of the full range of chroma QP offsets, even in combination with the automatic psy-based adjustments.

encoder/encoder.c

@@ -721,7 +721,6 @@ static int x264_validate_parameters( x264_t *h, int b_open )
         h->param.analyse.inter &= ~X264_ANALYSE_I8x8;
         h->param.analyse.intra &= ~X264_ANALYSE_I8x8;
     }
-    h->param.analyse.i_chroma_qp_offset = x264_clip3(h->param.analyse.i_chroma_qp_offset, -12, 12);
     h->param.analyse.i_trellis = x264_clip3( h->param.analyse.i_trellis, 0, 2 );
     h->param.rc.i_aq_mode = x264_clip3( h->param.rc.i_aq_mode, 0, 2 );
     h->param.rc.f_aq_strength = x264_clip3f( h->param.rc.f_aq_strength, 0, 3 );
@@ -766,6 +765,7 @@ static int x264_validate_parameters( x264_t *h, int b_open )
     h->param.analyse.f_psy_trellis = x264_clip3f( h->param.analyse.f_psy_trellis, 0, 10 );
     h->mb.i_psy_rd = h->param.analyse.i_subpel_refine >= 6 ? FIX8( h->param.analyse.f_psy_rd ) : 0;
     h->mb.i_psy_trellis = h->param.analyse.i_trellis ? FIX8( h->param.analyse.f_psy_trellis / 4 ) : 0;
+    h->param.analyse.i_chroma_qp_offset = x264_clip3(h->param.analyse.i_chroma_qp_offset, -32, 32);
     /* In 4:4:4 mode, chroma gets twice as much resolution, so we can halve its quality. */
     if( b_open && i_csp >= X264_CSP_I444 && i_csp < X264_CSP_BGR && h->param.analyse.b_psy )
         h->param.analyse.i_chroma_qp_offset += 6;