Set preset default value to MFX_TARGETUSAGE_UNKNOWN. Let runtime to
decide the targetUsage, so that ffmpeg-qsv can keep up with runtime's
update.

Signed-off-by: Wenbin Chen <wenbin.c...@intel.com>
---
 libavcodec/qsvenc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/qsvenc.h b/libavcodec/qsvenc.h
index f2b7ee361f..4315463cd2 100644
--- a/libavcodec/qsvenc.h
+++ b/libavcodec/qsvenc.h
@@ -52,7 +52,7 @@
 
 #define QSV_COMMON_OPTS \
 { "async_depth", "Maximum processing parallelism", OFFSET(qsv.async_depth), 
AV_OPT_TYPE_INT, { .i64 = ASYNC_DEPTH_DEFAULT }, 1, INT_MAX, VE },              
            \
-{ "preset", NULL, OFFSET(qsv.preset), AV_OPT_TYPE_INT, { .i64 = 
MFX_TARGETUSAGE_BALANCED }, MFX_TARGETUSAGE_BEST_QUALITY, 
MFX_TARGETUSAGE_BEST_SPEED,   VE, "preset" }, \
+{ "preset", NULL, OFFSET(qsv.preset), AV_OPT_TYPE_INT, { .i64 = 
MFX_TARGETUSAGE_UNKNOWN }, MFX_TARGETUSAGE_UNKNOWN, MFX_TARGETUSAGE_BEST_SPEED, 
  VE, "preset" },       \
 { "veryfast",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 
MFX_TARGETUSAGE_BEST_SPEED  },   INT_MIN, INT_MAX, VE, "preset" },              
                                  \
 { "faster",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_TARGETUSAGE_6  },    
        INT_MIN, INT_MAX, VE, "preset" },                                       
         \
 { "fast",        NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_TARGETUSAGE_5  },    
        INT_MIN, INT_MAX, VE, "preset" },                                       
         \
-- 
2.32.0

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