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Libavcodec: X264 - try to keep bitrate even

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This commit is contained in:
Martin Pulec
2015-06-05 16:22:13 +02:00
parent 0b41a0a5af
commit 7a2cf2c8c1
1 changed files with 32 additions and 50 deletions
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82
src/video_compress/libavcodec.cpp
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@@ -62,6 +62,7 @@
#include <unordered_map>
#define DEFAULT_CODEC MJPG
#define DEFAULT_X264_PRESET "superfast"
namespace {
@@ -814,53 +815,35 @@ static void setparam_default(AVCodecContext *codec_ctx, struct setparam_param *p
}
}
#define APPEND_PARAM(params, param) \
if(strlen(params) > 0) { \
strncat(params, ":", sizeof(params) - strlen(params) - 1); \
} \
strncat(params, param, sizeof(params) - strlen(params) - 1);
static void setparam_h264(AVCodecContext *codec_ctx, struct setparam_param *param)
{
char params[512] = "";
if(!param->have_preset) {
// ultrafast - --aq-mode 0
// This option causes posterization. Enabling it requires some 20% additional
if (!param->have_preset) {
// ultrafast + --aq-mode 2
// AQ=0 causes posterization. Enabling it requires some 20% additional
// percent of CPU.
strncat(params, "no-8x8dct=1:b-adapt=0:bframes=0:no-cabac=1:"
string params("no-8x8dct=1:b-adapt=0:bframes=0:no-cabac=1:"
"no-deblock=1:no-mbtree=1:me=dia:no-mixed-refs=1:partitions=none:"
"rc-lookahead=0:ref=1:scenecut=0:subme=0:trellis=0",
sizeof(params) - strlen(params) - 1);
}
"rc-lookahead=0:ref=1:scenecut=0:subme=0:trellis=0:aq_mode=2");
if (param->exact_bitrate) {
APPEND_PARAM(params, "aq_mode=0");
} else {
APPEND_PARAM(params, "aq_mode=1");
}
// this options increases variance in frame sizes quite a lot
//if (param->interlaced) {
// params += ":tff=1";
//}
if (param->interlaced && !param->exact_bitrate) {
APPEND_PARAM(params, "tff=1");
}
if(strlen(params) > 0) {
int ret;
// newer LibAV
ret = av_opt_set(codec_ctx->priv_data, "x264-params", params, 0);
if(ret != 0) {
ret = av_opt_set(codec_ctx->priv_data, "x264-params", params.c_str(), 0);
if (ret != 0) {
// newer FFMPEG
ret = av_opt_set(codec_ctx->priv_data, "x264opts", params, 0);
ret = av_opt_set(codec_ctx->priv_data, "x264opts", params.c_str(), 0);
}
if(ret != 0) {
if (ret != 0) {
// older version of both
// or superfast?? requires + some 70 % CPU but does not cause posterization
ret = av_opt_set(codec_ctx->priv_data, "preset", "ultrafast", 0);
fprintf(stderr, "[Lavc] Warning: Old FFMPEG/LibAV detected. "
"Try supplying 'preset=superfast' argument to "
"avoid posterization!\n");
ret = av_opt_set(codec_ctx->priv_data, "preset", DEFAULT_X264_PRESET, 0);
fprintf(stderr, "[Lavc] Warning: Old FFMPEG/LibAV detected - consider "
"upgrading. Using preset %s.\n", DEFAULT_X264_PRESET);
}
if(ret != 0) {
if (ret != 0) {
fprintf(stderr, "[Lavc] Warning: Unable to set preset.\n");
}
}
@@ -868,21 +851,20 @@ static void setparam_h264(AVCodecContext *codec_ctx, struct setparam_param *para
//av_opt_set(codec_ctx->priv_data, "tune", "fastdecode", 0);
av_opt_set(codec_ctx->priv_data, "tune", "fastdecode,zerolatency", 0);
if (param->exact_bitrate) {
codec_ctx->rc_max_rate = codec_ctx->bit_rate / 2 * 3;
//codec_ctx->rc_min_rate = s->codec_ctx->bit_rate / 4 * 3;
//codec_ctx->rc_buffer_aggressivity = 1.0;
codec_ctx->rc_buffer_size = codec_ctx->rc_max_rate / param->fps;
codec_ctx->qcompress = 0.0f;
//codec_ctx->qblur = 0.0f;
//codec_ctx->rc_min_vbv_overflow_use = 1.0f;
//codec_ctx->rc_max_available_vbv_use = 1.0f;
codec_ctx->qmin = 0;
codec_ctx->qmax = 69;
codec_ctx->max_qdiff = 69;
//codec_ctx->rc_qsquish = 0;
//codec_ctx->scenechange_threshold = 100;
}
// try to keep frame sizes as even as possible
codec_ctx->rc_max_rate = codec_ctx->bit_rate;
//codec_ctx->rc_min_rate = s->codec_ctx->bit_rate / 4 * 3;
//codec_ctx->rc_buffer_aggressivity = 1.0;
codec_ctx->rc_buffer_size = codec_ctx->rc_max_rate / param->fps * 8;
codec_ctx->qcompress = 0.0f;
//codec_ctx->qblur = 0.0f;
//codec_ctx->rc_min_vbv_overflow_use = 1.0f;
//codec_ctx->rc_max_available_vbv_use = 1.0f;
codec_ctx->qmin = 0;
codec_ctx->qmax = 69;
codec_ctx->max_qdiff = 69;
//codec_ctx->rc_qsquish = 0;
//codec_ctx->scenechange_threshold = 100;
if (!param->h264_no_periodic_intra) {
codec_ctx->refs = 1;