The parameters in the docs are currently swapped.
---
 libavutil/pixdesc.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavutil/pixdesc.h b/libavutil/pixdesc.h
index fe06d94..aea1e38 100644
--- a/libavutil/pixdesc.h
+++ b/libavutil/pixdesc.h
@@ -268,8 +268,8 @@ enum AVPixelFormat av_pix_fmt_desc_get_id(const 
AVPixFmtDescriptor *desc);
  * the pixel format AVPixFmtDescriptor.
  *
  * @param[in]  pix_fmt the pixel format
- * @param[out] h_shift store log2_chroma_h
- * @param[out] v_shift store log2_chroma_w
+ * @param[out] h_shift store log2_chroma_w (horizontal/width shift)
+ * @param[out] v_shift store log2_chroma_h (vertical/height shift)
  *
  * @return 0 on success, AVERROR(ENOSYS) on invalid or unknown pixel format
  */
-- 
2.0.0

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