The Intel driver unhelpfully injects SEI messages which the user
didn't ask for into the stream when in constant-bitrate mode. This
change disables that "feature" by writing a zero-length SEI packed
header which the driver will then use instead of its version.
---
libavcodec/vaapi_encode_h264.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/libavcodec/vaapi_encode_h264.c b/libavcodec/vaapi_encode_h264.c
index 347dc90..366a008 100644
--- a/libavcodec/vaapi_encode_h264.c
+++ b/libavcodec/vaapi_encode_h264.c
@@ -487,6 +487,24 @@ static int
vaapi_encode_h264_write_slice_header(AVCodecContext *avctx,
tmp, header_len);
}
+static int vaapi_encode_h264_write_extra_header(AVCodecContext *avctx,
+ VAAPIEncodePicture *pic,
+ int index, int *type,
+ char *data, size_t *data_len)
+{
+ if (index == 0) {
+ // The Intel driver will inject an unhelpful SEI message if we
+ // don't provide one, so just give it an empty buffer to chew on
+ // harmlessly.
+ *type = VAEncPackedHeaderH264_SEI;
+ *data_len = 0;
+ return 0;
+
+ } else {
+ return AVERROR_EOF;
+ }
+}
+
static int vaapi_encode_h264_init_sequence_params(AVCodecContext *avctx)
{
VAAPIEncodeContext *ctx = avctx->priv_data;
@@ -877,6 +895,8 @@ static VAAPIEncodeType vaapi_encode_type_h264 = {
.slice_header_type = VAEncPackedHeaderH264_Slice,
.write_slice_header = &vaapi_encode_h264_write_slice_header,
+
+ .write_extra_header = &vaapi_encode_h264_write_extra_header,
};
static av_cold int vaapi_encode_h264_init(AVCodecContext *avctx)
--
2.8.0.rc3
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