It's not used anywhere and apparrently hasn't been for a very long time.
---
libavcodec/avcodec.h | 4 +++-
libavcodec/options.c | 2 ++
libavcodec/version.h | 3 +++
3 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 984c2d3..fb28ff3 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -1208,13 +1208,15 @@ typedef struct AVCodecContext {
*/
enum PixelFormat pix_fmt;
+#if FF_API_RATE_EMU
/**
* Frame rate emulation. If not zero, the lower layer (i.e. format handler)
* has to read frames at native frame rate.
* - encoding: Set by user.
* - decoding: unused
*/
- int rate_emu;
+ attribute_deprecated int rate_emu;
+#endif
/**
* If non NULL, 'draw_horiz_band' is called by the libavcodec
diff --git a/libavcodec/options.c b/libavcodec/options.c
index f7fa454..fb7d371 100644
--- a/libavcodec/options.c
+++ b/libavcodec/options.c
@@ -105,7 +105,9 @@ static const AVOption options[]={
{"extradata_size", NULL, OFFSET(extradata_size), FF_OPT_TYPE_INT, DEFAULT,
INT_MIN, INT_MAX},
{"time_base", NULL, OFFSET(time_base), FF_OPT_TYPE_RATIONAL, DEFAULT, INT_MIN,
INT_MAX},
{"g", "set the group of picture size", OFFSET(gop_size), FF_OPT_TYPE_INT, 12,
INT_MIN, INT_MAX, V|E},
+#if FF_API_RATE_EMU
{"rate_emu", "frame rate emulation", OFFSET(rate_emu), FF_OPT_TYPE_INT,
DEFAULT, INT_MIN, INT_MAX},
+#endif
{"ar", "set audio sampling rate (in Hz)", OFFSET(sample_rate),
FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX},
{"ac", "set number of audio channels", OFFSET(channels), FF_OPT_TYPE_INT,
DEFAULT, INT_MIN, INT_MAX},
{"cutoff", "set cutoff bandwidth", OFFSET(cutoff), FF_OPT_TYPE_INT, DEFAULT,
INT_MIN, INT_MAX, A|E},
diff --git a/libavcodec/version.h b/libavcodec/version.h
index cad1dec..92f5218 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -77,5 +77,8 @@
#ifndef FF_API_GLOBAL_LPC
#define FF_API_GLOBAL_LPC (LIBAVCODEC_VERSION_MAJOR < 54)
#endif
+#ifndef FF_API_RATE_EMU
+#define FF_API_RATE_EMU (LIBAVFORMAT_VERSION_MAJOR < 53)
+#endif
#endif /* AVCODEC_VERSION_H */
--
1.7.4.1
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