fix some a/an typos

Signed-off-by: Lou Logan <lou@lrcd.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index ccb8033f9a..5e918a04c3 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -2449,7 +2449,7 @@ int av_write_frame(AVFormatContext *s, AVPacket *pkt);
 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
 
 /**
- * Write a uncoded frame to an output media file.
+ * Write an uncoded frame to an output media file.
  *
  * The frame must be correctly interleaved according to the container
  * specification; if not, then av_interleaved_write_frame() must be used.
@@ -2460,7 +2460,7 @@ int av_write_uncoded_frame(AVFormatContext *s, int stream_index,
                            AVFrame *frame);
 
 /**
- * Write a uncoded frame to an output media file.
+ * Write an uncoded frame to an output media file.
  *
  * If the muxer supports it, this function makes it possible to write an AVFrame
  * structure directly, without encoding it into a packet.