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lavc/qsvenc: update the selection of bitrate control method

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The default method is changed to CQP

Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>
This commit is contained in:
Haihao Xiang 2024-02-01 16:35:35 +08:00
parent 57fbe929f3
commit d263fce2b2
8 changed files with 54 additions and 25 deletions
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1
Changelog
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@ -27,6 +27,7 @@ version <next>:
- a C11-compliant compiler is now required; note that this requirement
will be bumped to C17 in the near future, so consider updating your
build environment if it lacks C17 support
- Change the default bitrate control method from VBR to CQP for QSV encoders.
version 6.1:
- libaribcaption decoder

7
doc/encoders.texi
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@ -3338,8 +3338,8 @@ quality range is 1 to 51, with 1 being the best quality.
@end itemize
@item
Otherwise, a bitrate-based mode is used. For all of those, you should specify at
least the desired average bitrate with the @option{b} option.
Otherwise when the desired average bitrate is specified with the @option{b}
option, a bitrate-based mode is used.
@itemize @minus
@item
@var{LA} - VBR with lookahead, when the @option{look_ahead} option is specified.
@ -3360,6 +3360,9 @@ than the average bitrate.
@option{avbr_accuracy} and @option{avbr_convergence} are set to non-zero. This
mode is available for H264 and HEVC on Windows.
@end itemize
@item
Otherwise the default ratecontrol method @var{CQP} is used.
@end itemize
Note that depending on your system, a different mode than the one you specified

61
libavcodec/qsvenc.c
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@ -597,6 +597,13 @@ static int select_rc_mode(AVCodecContext *avctx, QSVEncContext *q)
else if (want_vcm) {
rc_mode = MFX_RATECONTROL_VCM;
rc_desc = "video conferencing mode (VCM)";
if (!avctx->bit_rate) {
av_log(avctx, AV_LOG_ERROR, "Using the %s ratecontrol method without "
"setting bitrate. Please use the b option to set the desired "
"bitrate.\n", rc_desc);
return AVERROR(EINVAL);
}
}
#endif
else if (want_la) {
@ -606,32 +613,50 @@ static int select_rc_mode(AVCodecContext *avctx, QSVEncContext *q)
if (avctx->global_quality > 0) {
rc_mode = MFX_RATECONTROL_LA_ICQ;
rc_desc = "intelligent constant quality with lookahead (LA_ICQ)";
} else if (!avctx->bit_rate) {
av_log(avctx, AV_LOG_ERROR, "Using the %s ratecontrol method without "
"setting bitrate. Please use the b option to set the desired "
"bitrate.\n", rc_desc);
return AVERROR(EINVAL);
}
}
else if (avctx->global_quality > 0 && !avctx->rc_max_rate) {
rc_mode = MFX_RATECONTROL_ICQ;
rc_desc = "intelligent constant quality (ICQ)";
}
else if (avctx->rc_max_rate == avctx->bit_rate) {
rc_mode = MFX_RATECONTROL_CBR;
rc_desc = "constant bitrate (CBR)";
}
else if (avctx->bit_rate) {
if (avctx->rc_max_rate == avctx->bit_rate) {
rc_mode = MFX_RATECONTROL_CBR;
rc_desc = "constant bitrate (CBR)";
}
#if QSV_HAVE_AVBR
else if (!avctx->rc_max_rate &&
(avctx->codec_id == AV_CODEC_ID_H264 || avctx->codec_id == AV_CODEC_ID_HEVC) &&
q->avbr_accuracy &&
q->avbr_convergence) {
rc_mode = MFX_RATECONTROL_AVBR;
rc_desc = "average variable bitrate (AVBR)";
}
else if (!avctx->rc_max_rate &&
(avctx->codec_id == AV_CODEC_ID_H264 || avctx->codec_id == AV_CODEC_ID_HEVC) &&
q->avbr_accuracy &&
q->avbr_convergence) {
rc_mode = MFX_RATECONTROL_AVBR;
rc_desc = "average variable bitrate (AVBR)";
}
#endif
else if (avctx->global_quality > 0) {
rc_mode = MFX_RATECONTROL_QVBR;
rc_desc = "constant quality with VBR algorithm (QVBR)";
}
else {
rc_mode = MFX_RATECONTROL_VBR;
rc_desc = "variable bitrate (VBR)";
else if (avctx->global_quality > 0) {
rc_mode = MFX_RATECONTROL_QVBR;
rc_desc = "constant quality with VBR algorithm (QVBR)";
} else {
rc_mode = MFX_RATECONTROL_VBR;
rc_desc = "variable bitrate (VBR)";
}
} else {
rc_mode = MFX_RATECONTROL_CQP;
rc_desc = "constant quantization parameter (CQP)";
if (avctx->codec_id == AV_CODEC_ID_AV1)
avctx->global_quality = FF_QP2LAMBDA * 128;
else
avctx->global_quality = FF_QP2LAMBDA * 26;
av_log(avctx, AV_LOG_WARNING, "Using the constant quantization "
"parameter (CQP) by default. Please use the global_quality "
"option and other options for a quality-based mode or the b "
"option and other options for a bitrate-based mode if the "
"default is not the desired choice.\n");
}
q->param.mfx.RateControlMethod = rc_mode;

2
libavcodec/qsvenc_av1.c
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@ -129,7 +129,7 @@ static const AVClass class = {
};
static const FFCodecDefault qsv_enc_defaults[] = {
{ "b", "1M" },
{ "b", "0" },
{ "g", "-1" },
{ "bf", "-1" },
{ "refs", "0" },

2
libavcodec/qsvenc_h264.c
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@ -178,7 +178,7 @@ static const AVClass class = {
};
static const FFCodecDefault qsv_enc_defaults[] = {
{ "b", "1M" },
{ "b", "0" },
{ "refs", "0" },
{ "g", "-1" },
{ "bf", "-1" },

2
libavcodec/qsvenc_hevc.c
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@ -374,7 +374,7 @@ static const AVClass class = {
};
static const FFCodecDefault qsv_enc_defaults[] = {
{ "b", "1M" },
{ "b", "0" },
{ "refs", "0" },
{ "g", "248" },
{ "bf", "-1" },

2
libavcodec/qsvenc_mpeg2.c
View File

@ -82,7 +82,7 @@ static const AVClass class = {
};
static const FFCodecDefault qsv_enc_defaults[] = {
{ "b", "1M" },
{ "b", "0" },
{ "refs", "0" },
// same as the x264 default
{ "g", "250" },

2
libavcodec/qsvenc_vp9.c
View File

@ -93,7 +93,7 @@ static const AVClass class = {
};
static const FFCodecDefault qsv_enc_defaults[] = {
{ "b", "1M" },
{ "b", "0" },
{ "refs", "0" },
{ "g", "250" },
{ "trellis", "-1" },