lavc/vaapi_encode_h26x: Fix a crash if "." is not the decimal separator.

Fixes Debian bugs #831529, #831909, #832964.

Signed-off-by: Mark Thompson <sw@jkqxz.net>
(cherry picked from commit 82e53b3cef)

libavcodec/vaapi_encode_h264.c

@@ -967,10 +967,10 @@ static const AVCodecDefault vaapi_encode_h264_defaults[] = {
     { "b",              "0"   },
     { "bf",             "2"   },
     { "g",              "120" },
-    { "i_qfactor",      "1.0" },
-    { "i_qoffset",      "0.0" },
-    { "b_qfactor",      "1.2" },
-    { "b_qoffset",      "0.0" },
+    { "i_qfactor",      "1"   },
+    { "i_qoffset",      "0"   },
+    { "b_qfactor",      "6/5" },
+    { "b_qoffset",      "0"   },
     { NULL },
 };
 

libavcodec/vaapi_encode_h265.c

@@ -1338,10 +1338,10 @@ static const AVCodecDefault vaapi_encode_h265_defaults[] = {
     { "b",              "0"   },
     { "bf",             "2"   },
     { "g",              "120" },
-    { "i_qfactor",      "1.0" },
-    { "i_qoffset",      "0.0" },
-    { "b_qfactor",      "1.2" },
-    { "b_qoffset",      "0.0" },
+    { "i_qfactor",      "1"   },
+    { "i_qoffset",      "0"   },
+    { "b_qfactor",      "6/5" },
+    { "b_qoffset",      "0"   },
     { NULL },
 };