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obs-ffmpeg: Add option to use b-frames as reference

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According to nvidia's documentation using b-frames as reference results in
a slight quality improvement with no/negligible performance impact and is
recommended to be enabled by default when using multiple b-frames.
This commit is contained in:
derrod 2019-02-20 04:48:23 +01:00
parent 4722b764ca
commit adf3337d3c
3 changed files with 13 additions and 0 deletions
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2
plugins/obs-ffmpeg/data/locale/en-US.ini
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@ -23,6 +23,8 @@ NVENC.LookAhead.ToolTip="Enables dynamic B-frames.\n\nIf disabled, the encoder w
NVENC.PsychoVisualTuning="Psycho Visual Tuning"
NVENC.PsychoVisualTuning.ToolTip="Enables encoder settings that optimize the use of bitrate for increased perceived visual quality,\nespecially in situations with high motion, at the cost of increased GPU utilization."
NVENC.CQLevel="CQ Level"
NVENC.BFramesAsRef="Use B-Frames as Reference"
NVENC.BFramesAsRef.ToolTip="Using B-Frames as a reference improves quality with negligible performance impact.\n\nIt is strongly recommended to enable this feature when using multiple B-Frames."
FFmpegSource="Media Source"
LocalFile="Local File"

6
plugins/obs-ffmpeg/jim-nvenc.c
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@ -318,6 +318,7 @@ static bool init_encoder(struct nvenc_data *enc, obs_data_t *settings)
const char *profile = obs_data_get_string(settings, "profile");
bool psycho_aq = obs_data_get_bool(settings, "psycho_aq");
bool lookahead = obs_data_get_bool(settings, "lookahead");
bool bframes_as_ref = obs_data_get_bool(settings, "bframes_as_ref");
int bf = (int)obs_data_get_int(settings, "bf");
bool vbr = astrcmpi(rc, "VBR") == 0;
NVENCSTATUS err;
@ -435,6 +436,11 @@ static bool init_encoder(struct nvenc_data *enc, obs_data_t *settings)
config->rcParams.enableTemporalAQ = psycho_aq;
}
/* b-frames as reference */
if (bf >= 1 && bframes_as_ref &&
nv_get_cap(enc, NV_ENC_CAPS_SUPPORT_BFRAME_REF_MODE))
h264_config->useBFramesAsRef = NV_ENC_BFRAME_REF_MODE_MIDDLE;
/* -------------------------- */
/* rate control */

5
plugins/obs-ffmpeg/obs-ffmpeg-nvenc.c
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@ -404,6 +404,7 @@ void nvenc_defaults(obs_data_t *settings)
obs_data_set_default_string(settings, "preset", "hq");
obs_data_set_default_string(settings, "profile", "high");
obs_data_set_default_bool(settings, "psycho_aq", true);
obs_data_set_default_bool(settings, "bframes_as_ref", true);
obs_data_set_default_int(settings, "gpu", 0);
obs_data_set_default_int(settings, "bf", 2);
}
@ -497,6 +498,10 @@ obs_properties_t *nvenc_properties_internal(bool ffmpeg)
obs_module_text("NVENC.PsychoVisualTuning"));
obs_property_set_long_description(p,
obs_module_text("NVENC.PsychoVisualTuning.ToolTip"));
p = obs_properties_add_bool(props, "bframes_as_ref",
obs_module_text("NVENC.BFramesAsRef"));
obs_property_set_long_description(p,
obs_module_text("NVENC.BFramesAsRef.ToolTip"));
}
obs_properties_add_int(props, "gpu", obs_module_text("GPU"), 0, 8, 1);