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lavc/qsvenc: Fix bitrate_limit to allow AVC encode in limited bitrate

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MFXVideoENCODE_Query calls CheckVideoParamQueryLike in MSDK and
will determine whether to set param.mfx.TargetKbps to the allowed
minTargetKbps according to the bitrate_limit in extco2 buffer.

Thus q->param.ExtParam must be set before MFXVideoENCODE_Query in case
minTargetKbps is written to TargetKbps by default.

1080P AVC encoding with option "-bitrate_limit 0 -b:v 100k":
Before patch:
            902 kbps
After patch:
            156 kbps
Signed-off-by: Linjie Fu <linjie.fu@intel.com>
This commit is contained in:
Linjie Fu 2019-10-15 15:56:23 +08:00 committed by Zhong Li
parent 53c21c2d6b
commit e786e37326
1 changed files with 19 additions and 19 deletions
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38
libavcodec/qsvenc.c
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@ -1052,25 +1052,6 @@ int ff_qsv_enc_init(AVCodecContext *avctx, QSVEncContext *q)
if (ret < 0)
return ret;
ret = MFXVideoENCODE_Query(q->session, &q->param, &q->param);
if (ret == MFX_WRN_PARTIAL_ACCELERATION) {
av_log(avctx, AV_LOG_WARNING, "Encoder will work with partial HW acceleration\n");
} else if (ret < 0) {
return ff_qsv_print_error(avctx, ret,
"Error querying encoder params");
}
ret = MFXVideoENCODE_QueryIOSurf(q->session, &q->param, &q->req);
if (ret < 0)
return ff_qsv_print_error(avctx, ret,
"Error querying (IOSurf) the encoding parameters");
if (opaque_alloc) {
ret = qsv_init_opaque_alloc(avctx, q);
if (ret < 0)
return ret;
}
if (avctx->hwaccel_context) {
AVQSVContext *qsv = avctx->hwaccel_context;
int i, j;
@ -1100,6 +1081,25 @@ int ff_qsv_enc_init(AVCodecContext *avctx, QSVEncContext *q)
q->param.NumExtParam = q->nb_extparam_internal;
}
ret = MFXVideoENCODE_Query(q->session, &q->param, &q->param);
if (ret == MFX_WRN_PARTIAL_ACCELERATION) {
av_log(avctx, AV_LOG_WARNING, "Encoder will work with partial HW acceleration\n");
} else if (ret < 0) {
return ff_qsv_print_error(avctx, ret,
"Error querying encoder params");
}
ret = MFXVideoENCODE_QueryIOSurf(q->session, &q->param, &q->req);
if (ret < 0)
return ff_qsv_print_error(avctx, ret,
"Error querying (IOSurf) the encoding parameters");
if (opaque_alloc) {
ret = qsv_init_opaque_alloc(avctx, q);
if (ret < 0)
return ret;
}
ret = MFXVideoENCODE_Init(q->session, &q->param);
if (ret < 0)
return ff_qsv_print_error(avctx, ret,