[FFmpeg-devel] [PATCH] libvpxenc: extend auto-alt-ref range

[James Zern]

vp9 now supports [0, 6]

Signed-off-by: James Zern <jzern at google.com>
---
 doc/encoders.texi      | 1 +
 libavcodec/libvpxenc.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/encoders.texi b/doc/encoders.texi
index 899faac49b..3c6f5cd70b 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -1641,6 +1641,7 @@ means unlimited.
 @table @option
 @item auto-alt-ref
 Enable use of alternate reference frames (2-pass only).
+Values greater than 1 enable multi-layer alternate reference frames (VP9 only).
 @item arnr-max-frames
 Set altref noise reduction max frame count.
 @item arnr-type
diff --git a/libavcodec/libvpxenc.c b/libavcodec/libvpxenc.c
index 09f7a88452..ad4480b2ae 100644
--- a/libavcodec/libvpxenc.c
+++ b/libavcodec/libvpxenc.c
@@ -1068,7 +1068,7 @@ static int vpx_encode(AVCodecContext *avctx, AVPacket *pkt,
 
 #define COMMON_OPTIONS \
     { "auto-alt-ref",    "Enable use of alternate reference " \
-                         "frames (2-pass only)",                   OFFSET(auto_alt_ref),    AV_OPT_TYPE_INT, {.i64 = -1},      -1,      2,       VE}, \
+                         "frames (2-pass only)",                   OFFSET(auto_alt_ref),    AV_OPT_TYPE_INT, {.i64 = -1},      -1,      6,       VE}, \
     { "lag-in-frames",   "Number of frames to look ahead for " \
                          "alternate reference frame selection",    OFFSET(lag_in_frames),   AV_OPT_TYPE_INT, {.i64 = -1},      -1,      INT_MAX, VE}, \
     { "arnr-maxframes",  "altref noise reduction max frame count", OFFSET(arnr_max_frames), AV_OPT_TYPE_INT, {.i64 = -1},      -1,      INT_MAX, VE}, \
-- 
2.19.1.930.g4563a0d9d0-goog