From: lekma <lekmalek@gmail.com>
Date: Wed, 30 Sep 2015 15:17:19 +0000 (+0200)
Subject: libav: transcode in HEVC
X-Git-Tag: v4.2.1~2012
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=767067832b1b510bd6c7fd5d3672072510c537b9;p=thirdparty%2Ftvheadend.git

libav: transcode in HEVC

- better latency for default settings
---

diff --git a/src/plumbing/transcoding.c b/src/plumbing/transcoding.c
index aa401774b..f69dccbd7 100644
--- a/src/plumbing/transcoding.c
+++ b/src/plumbing/transcoding.c
@@ -1204,13 +1204,14 @@ transcoder_stream_video(transcoder_t *t, transcoder_stream_t *ts, th_pkt_t *pkt)
       octx->pix_fmt        = PIX_FMT_YUV420P;
       octx->flags         |= CODEC_FLAG_GLOBAL_HEADER;
 
-      av_dict_set(&opts, "preset",    "superfast",       0);
-      av_dict_set(&opts, "tune",      "fastdecode",      0);
-      av_dict_set(&opts, "crf",       "18",              0);
-      // decrease latency as much as possible
-      av_dict_set(&opts, "x265_opts", "bframes=0",       0);
-      av_dict_set(&opts, "x265_opts", ":rc-lookahead=0", AV_DICT_APPEND);
-      av_dict_set(&opts, "x265_opts", ":scenecut=0",     AV_DICT_APPEND);
+      av_dict_set(&opts, "preset",    "ultrafast",        0);
+      av_dict_set(&opts, "tune",      "fastdecode",       0);
+      av_dict_set(&opts, "crf",       "18",               0);
+      // the following is equivalent to tune=zerolatency for presets: ultra/superfast
+      av_dict_set(&opts, "x265_opts", "bframes=0",        0);
+      av_dict_set(&opts, "x265_opts", ":rc-lookahead=0",  AV_DICT_APPEND);
+      av_dict_set(&opts, "x265_opts", ":scenecut=0",      AV_DICT_APPEND);
+      av_dict_set(&opts, "x265_opts", ":frame-threads=1", AV_DICT_APPEND);
 
       break;