avcodec/nvenc_av1: Correct CQ range for AV1

The Constant Quality (CQ) range for the AV1 codec is actually 0 to
63, contrary to what is stated in the header and documentation.

Signed-off-by: Diego Felix de Souza <ddesouza@nvidia.com>
Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>

libavcodec/nvenc_av1.c

@@ -105,8 +105,8 @@ static const AVOption options[] = {
                                                             OFFSET(async_depth),  AV_OPT_TYPE_INT,   { .i64 = INT_MAX }, 0, INT_MAX, VE },
     { "rc-lookahead", "Number of frames to look ahead for rate-control",
                                                             OFFSET(rc_lookahead), AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, VE },
-    { "cq",           "Set target quality level (0 to 51, 0 means automatic) for constant quality mode in VBR rate control",
-                                                            OFFSET(quality),      AV_OPT_TYPE_FLOAT, { .dbl = 0.}, 0., 51., VE },
+    { "cq",           "Set target quality level (0 to 63, 0 means automatic) for constant quality mode in VBR rate control",
+                                                            OFFSET(quality),      AV_OPT_TYPE_FLOAT, { .dbl = 0.}, 0., 63., VE },
     { "init_qpP",     "Initial QP value for P frame",       OFFSET(init_qp_p),    AV_OPT_TYPE_INT,   { .i64 = -1 }, -1, 255, VE },
     { "init_qpB",     "Initial QP value for B frame",       OFFSET(init_qp_b),    AV_OPT_TYPE_INT,   { .i64 = -1 }, -1, 255, VE },
     { "init_qpI",     "Initial QP value for I frame",       OFFSET(init_qp_i),    AV_OPT_TYPE_INT,   { .i64 = -1 }, -1, 255, VE },