[FFmpeg-devel] [PATCH 2/3] Optimize nvenc parameters, add 3 more presets: fast, medium, slow
Clément Bœsch
u at pkh.me
Fri Sep 11 11:46:31 CEST 2015
On Fri, Sep 11, 2015 at 05:32:06PM +0800, Agatha Hu wrote:
> From: ahu <ahu at ubuntu.(none)>
>
> ---
> libavcodec/nvenc.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++-----
> 1 file changed, 54 insertions(+), 5 deletions(-)
>
> diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c
> index 3174b01..fd90f7b 100644
> --- a/libavcodec/nvenc.c
> +++ b/libavcodec/nvenc.c
> @@ -610,8 +610,17 @@ static av_cold int nvenc_encode_init(AVCodecContext *avctx)
> if (ctx->preset) {
> if (!strcmp(ctx->preset, "hp")) {
> encoder_preset = NV_ENC_PRESET_HP_GUID;
> + } else if (!strcmp(ctx->preset, "fast")) {
> + ctx->twopass = 0;
> + encoder_preset = NV_ENC_PRESET_HQ_GUID;
> } else if (!strcmp(ctx->preset, "hq")) {
> encoder_preset = NV_ENC_PRESET_HQ_GUID;
> + } else if (!strcmp(ctx->preset, "medium")) {
> + ctx->twopass = 0;
> + encoder_preset = NV_ENC_PRESET_HQ_GUID;
> + } else if (!strcmp(ctx->preset, "slow")) {
> + ctx->twopass = 1;
> + encoder_preset = NV_ENC_PRESET_HQ_GUID;
> } else if (!strcmp(ctx->preset, "bd")) {
> encoder_preset = NV_ENC_PRESET_BD_GUID;
> } else if (!strcmp(ctx->preset, "ll")) {
> @@ -632,7 +641,7 @@ static av_cold int nvenc_encode_init(AVCodecContext *avctx)
> } else if (!strcmp(ctx->preset, "default")) {
> encoder_preset = NV_ENC_PRESET_DEFAULT_GUID;
> } else {
> - av_log(avctx, AV_LOG_FATAL, "Preset \"%s\" is unknown! Supported presets: hp, hq, bd, ll, llhp, llhq, lossless, losslesshp, default\n", ctx->preset);
> + av_log(avctx, AV_LOG_FATAL, "Preset \"%s\" is unknown! Supported presets: slow, medium, fast, hp, hq, bd, ll, llhp, llhq, lossless, losslesshp, default\n", ctx->preset);
> res = AVERROR(EINVAL);
> goto error;
> }
> @@ -710,6 +719,7 @@ static av_cold int nvenc_encode_init(AVCodecContext *avctx)
> switch (avctx->codec->id) {
> case AV_CODEC_ID_H264:
> ctx->encode_config.encodeCodecConfig.h264Config.maxNumRefFrames = avctx->refs;
> + ctx->encode_config.encodeCodecConfig.h264Config.hierarchicalPFrames = 1;
> break;
> case AV_CODEC_ID_H265:
> ctx->encode_config.encodeCodecConfig.hevcConfig.maxNumRefFramesInDPB = avctx->refs;
> @@ -770,7 +780,7 @@ static av_cold int nvenc_encode_init(AVCodecContext *avctx)
> avctx->qmin = -1;
> avctx->qmax = -1;
> } else if (ctx->cbr) {
> - if (!ctx->twopass) {
> + if (ctx->twopass < 1) {
> ctx->encode_config.rcParams.rateControlMode = NV_ENC_PARAMS_RC_CBR;
> } else if (ctx->twopass == 1 || isLL) {
> ctx->encode_config.rcParams.rateControlMode = NV_ENC_PARAMS_RC_2_PASS_QUALITY;
> @@ -799,7 +809,7 @@ static av_cold int nvenc_encode_init(AVCodecContext *avctx)
> ctx->encode_config.encodeCodecConfig.h264Config.fmoMode = NV_ENC_H264_FMO_DISABLE;
> }
> } else {
> - ctx->encode_config.rcParams.rateControlMode = NV_ENC_PARAMS_RC_VBR;
> + ctx->encode_config.rcParams.rateControlMode = NV_ENC_PARAMS_RC_VBR_MINQP;
> }
>
> ctx->encode_config.rcParams.enableMinQP = 1;
> @@ -812,6 +822,45 @@ static av_cold int nvenc_encode_init(AVCodecContext *avctx)
> ctx->encode_config.rcParams.maxQP.qpInterB = avctx->qmax;
> ctx->encode_config.rcParams.maxQP.qpInterP = avctx->qmax;
> ctx->encode_config.rcParams.maxQP.qpIntra = avctx->qmax;
> +
> + {
> + uint32_t qpInterP = (avctx->qmax + 3*avctx->qmin)/4; // biased towards Qmin
> + ctx->encode_config.rcParams.initialRCQP.qpInterP = qpInterP;
> + if(avctx->i_quant_factor != 0.0 && avctx->b_quant_factor != 0.0) {
> + ctx->encode_config.rcParams.initialRCQP.qpIntra = qpInterP * fabs(avctx->i_quant_factor);
> + ctx->encode_config.rcParams.initialRCQP.qpIntra += qpInterP * (avctx->i_quant_offset);
> + ctx->encode_config.rcParams.initialRCQP.qpInterB = qpInterP * fabs(avctx->b_quant_factor);
> + ctx->encode_config.rcParams.initialRCQP.qpInterB += qpInterP * (avctx->b_quant_offset);
> + } else {
> + ctx->encode_config.rcParams.initialRCQP.qpIntra = qpInterP;
> + ctx->encode_config.rcParams.initialRCQP.qpInterB = qpInterP;
> + }
> + }
> + ctx->encode_config.rcParams.enableInitialRCQP = 1;
> + } else {
> + if (ctx->twopass < 1) {
> + ctx->encode_config.rcParams.rateControlMode = NV_ENC_PARAMS_RC_VBR;
> + } else {
> + ctx->encode_config.rcParams.rateControlMode = NV_ENC_PARAMS_RC_2_PASS_VBR;
> + }
> +
> + {
> + uint32_t qpInterP = 26; // default to 26
> + ctx->encode_config.rcParams.initialRCQP.qpInterP = qpInterP;
> +
> + if(avctx->i_quant_factor != 0.0 && avctx->b_quant_factor != 0.0) {
> +
> + ctx->encode_config.rcParams.initialRCQP.qpIntra = qpInterP * fabs(avctx->i_quant_factor);
> + ctx->encode_config.rcParams.initialRCQP.qpIntra += qpInterP * (avctx->i_quant_offset);
> +
> + ctx->encode_config.rcParams.initialRCQP.qpInterB = qpInterP * fabs(avctx->b_quant_factor);
> + ctx->encode_config.rcParams.initialRCQP.qpInterB += qpInterP * (avctx->b_quant_offset);
> + } else {
> + ctx->encode_config.rcParams.initialRCQP.qpIntra = qpInterP;
> + ctx->encode_config.rcParams.initialRCQP.qpInterB = qpInterP;
> + }
> + }
> + ctx->encode_config.rcParams.enableInitialRCQP = 1;
> }
>
> if (avctx->rc_buffer_size > 0)
> @@ -1415,12 +1464,12 @@ static const enum AVPixelFormat pix_fmts_nvenc[] = {
> #define OFFSET(x) offsetof(NvencContext, x)
> #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
> static const AVOption options[] = {
> - { "preset", "Set the encoding preset (one of hq, hp, bd, ll, llhq, llhp, default)", OFFSET(preset), AV_OPT_TYPE_STRING, { .str = "hq" }, 0, 0, VE },
> + { "preset", "Set the encoding preset (one of one of slow=hq 2pass, medium= hq, fast = hp, hq, hp, bd, ll, llhq, llhp, default)", OFFSET(preset), AV_OPT_TYPE_STRING, { .str = "hq" }, 0, 0, VE },
> { "profile", "Set the encoding profile (high, main or baseline)", OFFSET(profile), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE },
> { "level", "Set the encoding level restriction (auto, 1.0, 1.0b, 1.1, 1.2, ..., 4.2, 5.0, 5.1)", OFFSET(level), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE },
> { "tier", "Set the encoding tier (main or high)", OFFSET(tier), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE },
> { "cbr", "Use cbr encoding mode", OFFSET(cbr), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
> - { "2pass", "Use 2pass cbr encoding mode", OFFSET(twopass), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE },
> + { "2pass", "Use 2pass encoding mode", OFFSET(twopass), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
I believe you want to keep the 3 state bool (note: you probably want to
use AV_OPT_TYPE_BOOL here so "auto", "true", "false" are recognized), and
change ctx->twopass to sth else in nvenc_encode_init() if and only if it
is set to "auto" (-1).
That way, you can detect cases where the users try to set this 2pass
option with a preset where it is unsupported (and raise an appropriate
error).
Regards,
--
Clément B.
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