> -----Original Message-----
> From: libav-devel [mailto:[email protected]] On Behalf Of Mark
> Thompson
> Sent: Wednesday, October 25, 2017 7:29 AM
> To: libav development <[email protected]>
> Subject: [libav-devel] [PATCH 1/2] vaapi_h264: Add workaround for bad SEI
> in old Intel drivers
>
> With pre-2.0 Intel drivers in CBR mode, if an explicit SEI message with the
> old
> (now deprecated) type is not included, the driver generates and inserts some
> timing SEI which is almost certainly invlaid. Before
> 7a4fac5e91789b73e07bd4ad20493cfde028df76 we always inserted our own
> SEI so this would not be visible, but since then it has been possible to
> disable
> that. We would also like to avoid using the deprecated type, and using the
> new type, while working in old drivers, does not suppress the spurious
> message like the old type does.
>
> Therefore, suppress the bad SEI insertion by providing a zero-length buffer
> with the old type, which the driver can insert harmlessly.
> ---
> libavcodec/vaapi_encode_h264.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/libavcodec/vaapi_encode_h264.c
> b/libavcodec/vaapi_encode_h264.c index 3ff19d2c8..377e3652d 100644
> --- a/libavcodec/vaapi_encode_h264.c
> +++ b/libavcodec/vaapi_encode_h264.c
> @@ -82,6 +82,7 @@ typedef struct VAAPIEncodeH264Context {
> CodedBitstreamFragment current_access_unit;
> int aud_needed;
> int sei_needed;
> + int sei_cbr_workaround_needed;
> } VAAPIEncodeH264Context;
>
> typedef struct VAAPIEncodeH264Options { @@ -254,6 +255,19 @@ static
> int vaapi_encode_h264_write_extra_header(AVCodecContext *avctx,
>
> *type = VAEncPackedHeaderH264_SEI;
> return 0;
> +
> +#if !HAVE_VAAPI_1
> + } else if (priv->sei_cbr_workaround_needed) {
> + // Insert a zero-length header using the old SEI type. This is
> + // required to avoid triggering broken behaviour on Intel
> platforms
> + // in CBR mode where an invalid SEI message is generated by the
> + // driver and inserted into the stream.
> + *data_len = 0;
> + *type = VAEncPackedHeaderH264_SEI;
> + priv->sei_cbr_workaround_needed = 0;
> + return 0;
> +#endif
> +
> } else {
> return AVERROR_EOF;
> }
> @@ -608,6 +622,10 @@ static int
> vaapi_encode_h264_init_picture_params(AVCodecContext *avctx,
>
> if (opt->sei & SEI_IDENTIFIER && pic->encode_order == 0)
> priv->sei_needed = 1;
> +#if !HAVE_VAAPI_1
> + if (ctx->va_rc_mode == VA_RC_CBR)
> + priv->sei_cbr_workaround_needed = 1; #endif
LGMT as a whole. Should have a new line for "#endif"?
>
> if (opt->sei & SEI_TIMING) {
> memset(&priv->pic_timing, 0, sizeof(priv->pic_timing));
> --
> 2.11.0
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