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vaapi_h264: Enable VBR mode 

Default to using VBR when a target bitrate is set, unless the max rate
is also set and matches the target.  Changes to the Intel driver mean
that min_qp is also respected in this case, so set a codec default to
unset the value rather than using the current default inherited from
the MPEG-4 part 2 encoder.
This commit is contained in:
Mark Thompson 2017-01-29 14:12:20 +00:00
parent f033ba470f
commit eddfb57210
1 changed files with 11 additions and 5 deletions
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16
libavcodec/vaapi_encode_h264.c
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@ -1126,13 +1126,15 @@ static av_cold int vaapi_encode_h264_configure(AVCodecContext *avctx)
"%d / %d / %d for IDR- / P- / B-frames.\n",
priv->fixed_qp_idr, priv->fixed_qp_p, priv->fixed_qp_b);
} else if (ctx->va_rc_mode == VA_RC_CBR) {
} else if (ctx->va_rc_mode == VA_RC_CBR ||
ctx->va_rc_mode == VA_RC_VBR) {
// These still need to be set for pic_init_qp/slice_qp_delta.
priv->fixed_qp_idr = 26;
priv->fixed_qp_p = 26;
priv->fixed_qp_b = 26;
av_log(avctx, AV_LOG_DEBUG, "Using constant-bitrate = %d bps.\n",
av_log(avctx, AV_LOG_DEBUG, "Using %s-bitrate = %d bps.\n",
ctx->va_rc_mode == VA_RC_CBR ? "constant" : "variable",
avctx->bit_rate);
} else {
@ -1241,9 +1243,12 @@ static av_cold int vaapi_encode_h264_init(AVCodecContext *avctx)
// Only 8-bit encode is supported.
ctx->va_rt_format = VA_RT_FORMAT_YUV420;
if (avctx->bit_rate > 0)
ctx->va_rc_mode = VA_RC_CBR;
else
if (avctx->bit_rate > 0) {
if (avctx->rc_max_rate == avctx->bit_rate)
ctx->va_rc_mode = VA_RC_CBR;
else
ctx->va_rc_mode = VA_RC_VBR;
} else
ctx->va_rc_mode = VA_RC_CQP;
ctx->va_packed_headers =
@ -1281,6 +1286,7 @@ static const AVCodecDefault vaapi_encode_h264_defaults[] = {
{ "i_qoffset", "0.0" },
{ "b_qfactor", "1.2" },
{ "b_qoffset", "0.0" },
{ "qmin", "0" },
{ NULL },
};