diff --git a/ext/at3_standalone/compat.h b/ext/at3_standalone/compat.h
index 57b0244de4..f282f0c9c5 100644
--- a/ext/at3_standalone/compat.h
+++ b/ext/at3_standalone/compat.h
@@ -37,10 +37,6 @@
 #define av_printf_format(a,b)
 #define avpriv_report_missing_feature(...)
 
-#define AV_NOPTS_VALUE          ((int64_t)UINT64_C(0x8000000000000000))
-#define AV_TIME_BASE            1000000
-#define AV_TIME_BASE_Q          (AVRational){1, AV_TIME_BASE}
-
 #define AVERROR(e) (-(e))   ///< Returns a negative error code from a POSIX error code, to return from library functions.
 #define AVUNERROR(e) (-(e)) ///< Returns a POSIX error code from a library function error return value.
 
@@ -49,8 +45,6 @@
 #define AVERROR_INVALIDDATA        FFERRTAG( 'I','N','D','A') ///< Invalid data found when processing input
 #define AVERROR_PATCHWELCOME       FFERRTAG( 'P','A','W','E') ///< Not yet implemented in FFmpeg, patches welcome
 
-#define FF_SANE_NB_CHANNELS 64U
-
 #define AV_LOG_ERROR    16
 #define AV_LOG_WARNING  24
 #define AV_LOG_INFO     32
@@ -60,13 +54,6 @@
 
 void av_log(int level, const char *fmt, ...) av_printf_format(3, 4);
 
-/**
- * Maximum size in bytes of extradata.
- * This value was chosen such that every bit of the buffer is
- * addressable by a 32-bit signed integer as used by get_bits.
- */
-#define FF_MAX_EXTRADATA_SIZE ((1 << 28) - AV_INPUT_BUFFER_PADDING_SIZE)
-
  /**
   * Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they
   * are not representable as absolute values of their type. This is the same