vaapi_encode: Clean up the packed header configuration

Add a larger warning more clearly explaining the consequences of missing
packed header support in the driver.  Also only write the extradata if the
user actually requests it via the GLOBAL_HEADER flag.

1 files changed, 4 insertions, 2 deletions

diff --git a/libavcodec/vaapi_encode_vp9.c b/libavcodec/vaapi_encode_vp9.c
index d4069ec850..39bc868f3a 100644
--- a/libavcodec/vaapi_encode_vp9.c
+++ b/libavcodec/vaapi_encode_vp9.c
@@ -228,8 +228,10 @@ static av_cold int vaapi_encode_vp9_init(AVCodecContext *avctx)
 
     ctx->codec = &vaapi_encode_type_vp9;
 
-    // Packed headers are not currently supported.
-    ctx->va_packed_headers = 0;
+    // No packed headers are currently desired.  They could be written,
+    // but there isn't any reason to do so - the one usable driver (i965)
+    // can write its own headers and there is no metadata to include.
+    ctx->desired_packed_headers = 0;
 
     // Surfaces must be aligned to superblock boundaries.
     ctx->surface_width  = FFALIGN(avctx->width,  64);