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Only increase rc_buffer_size when software encoding with more than one slice (#692)

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Cameron Gutman 2023-01-04 10:50:36 -06:00 committed by GitHub
parent 76896eba88
commit c72aeef67b
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1 changed files with 13 additions and 5 deletions
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10
src/video.cpp
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@ -1023,9 +1023,17 @@ std::optional<session_t> make_session(const encoder_t &encoder, const config_t &
if(video_format[encoder_t::CBR]) { if(video_format[encoder_t::CBR]) {
auto bitrate = config.bitrate * 1000; auto bitrate = config.bitrate * 1000;
ctx->rc_max_rate = bitrate; ctx->rc_max_rate = bitrate;
ctx->rc_buffer_size = bitrate / ((config.framerate * 10) / 15);
ctx->bit_rate = bitrate; ctx->bit_rate = bitrate;
ctx->rc_min_rate = bitrate; ctx->rc_min_rate = bitrate;
if(!hardware && ctx->slices > 1) {
// Use a larger rc_buffer_size for software encoding when slices are enabled,
// because libx264 can severely degrade quality if the buffer is too small.
ctx->rc_buffer_size = bitrate / ((config.framerate * 10) / 15);
}
else {
ctx->rc_buffer_size = bitrate / config.framerate;
}
} }
else if(video_format.qp) { else if(video_format.qp) {
handle_option(*video_format.qp); handle_option(*video_format.qp);