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motion-mrdave: added a patch to allow controlling h264 movie quality

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This commit is contained in:
Calin Crisan 2016-07-08 19:03:57 +03:00
parent da7f110a17
commit 8addd6174b
1 changed files with 29 additions and 2 deletions
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31
package/motion-mrdave/h264-crf-from-vbr.patch
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@ -1,7 +1,7 @@
From e65ea2454d6dcc759e2f4fd38548f6844a2c820b Mon Sep 17 00:00:00 2001
From: Calin Crisan <ccrisan@gmail.com>
Date: Sun, 3 Jul 2016 19:49:06 +0300
Subject: [PATCH] h264 codec: set crf option based on configured vbr
Subject: [PATCH 1/2] h264 codec: set crf option based on configured vbr
---
ffmpeg.c | 6 +++++-
@ -17,10 +17,37 @@ index df2b47e..ed192ca 100644
av_dict_set(&opts, "preset", "ultrafast", 0);
- av_dict_set(&opts, "crf", "18", 0);
+
+ /* transform vbr (2 - 31) into crf (0 - 51) by scaling */
+ /* transforrm vbr (2 - 31) into crf (0 - 51) by scaling */
+ char crf[4];
+ snprintf(crf, 4, "%d", (int) ((vbr - 2) * 1.758));
+
av_dict_set(&opts, "tune", "zerolatency", 0);
}
if (strcmp(ffmpeg_video_codec, "ffv1") == 0) c->strict_std_compliance = -2;
From b4138ee0ddc8a7b76b82eb1c80e5d5216dfcb8ce Mon Sep 17 00:00:00 2001
From: Calin Crisan <ccrisan@gmail.com>
Date: Wed, 6 Jul 2016 16:58:09 +0300
Subject: [PATCH 2/2] h264 codec: fixed crf from vbr: the vbr range is actually
1 to 32767
---
ffmpeg.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/ffmpeg.c b/ffmpeg.c
index ed192ca..0f80a09 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -296,9 +296,9 @@ struct ffmpeg *ffmpeg_open(char *ffmpeg_video_codec, char *filename,
c->codec_id == MY_CODEC_ID_HEVC){
av_dict_set(&opts, "preset", "ultrafast", 0);
- /* transforrm vbr (2 - 31) into crf (0 - 51) by scaling */
+ /* transform vbr (1 - 32767) into crf (0 - 51) by scaling */
char crf[4];
- snprintf(crf, 4, "%d", (int) ((vbr - 2) * 1.758));
+ snprintf(crf, 4, "%d", (int) ((vbr - 1) * 51.0 / 32766));
av_dict_set(&opts, "tune", "zerolatency", 0);
}