This avoids warnings of this kind, everywhere priv_class
is initialized:

warning: initialization discards qualifiers from pointer target type
---
 libavcodec/avcodec.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 7eb8b52..109d2a4 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2944,7 +2944,7 @@ typedef struct AVCodec {
     const enum AVSampleFormat *sample_fmts; ///< array of supported sample 
formats, or NULL if unknown, array is terminated by -1
     const int64_t *channel_layouts;         ///< array of support channel 
layouts, or NULL if unknown. array is terminated by 0
     uint8_t max_lowres;                     ///< maximum value for lowres 
supported by the decoder
-    AVClass *priv_class;                    ///< AVClass for the private 
context
+    const AVClass *priv_class;              ///< AVClass for the private 
context
     const AVProfile *profiles;              ///< array of recognized profiles, 
or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
 
     /**
-- 
1.7.3.1

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