Fix wrong use of "an" in some comments.

doc/Doxyfile

@@ -33,7 +33,7 @@ PROJECT_NAME           = FFmpeg
 
 PROJECT_NUMBER         =
 
-# With the PROJECT_LOGO tag one can specify an logo or icon that is included
+# With the PROJECT_LOGO tag one can specify a logo or icon that is included
 # in the documentation. The maximum height of the logo should not exceed 55
 # pixels and the maximum width should not exceed 200 pixels. Doxygen will
 # copy the logo to the output directory.

doc/ffmpeg-resampler.texi

@@ -12,7 +12,7 @@
 @chapter Description
 @c man begin DESCRIPTION
 
-The FFmpeg resampler provides an high-level interface to the
+The FFmpeg resampler provides a high-level interface to the
 libswresample library audio resampling utilities. In particular it
 allows to perform audio resampling, audio channel layout rematrixing,
 and convert audio format and packing layout.

doc/ffmpeg-scaler.texi

@@ -12,7 +12,7 @@
 @chapter Description
 @c man begin DESCRIPTION
 
-The FFmpeg rescaler provides an high-level interface to the libswscale
+The FFmpeg rescaler provides a high-level interface to the libswscale
 library image conversion utilities. In particular it allows to perform
 image rescaling and pixel format conversion.
 

doc/ffprobe.texi

@@ -113,7 +113,7 @@ ffprobe -show_packets -select_streams v:1 INPUT
 @end example
 
 @item -show_data
-Show payload data, as an hexadecimal and ASCII dump. Coupled with
+Show payload data, as a hexadecimal and ASCII dump. Coupled with
 @option{-show_packets}, it will dump the packets' data. Coupled with
 @option{-show_streams}, it will dump the codec extradata.
 

doc/filters.texi

@@ -1644,7 +1644,7 @@ The filter has no parameters. The input is not modified. Statistics about
 the volume will be printed in the log when the input stream end is reached.
 
 In particular it will show the mean volume (root mean square), maximum
-volume (on a per-sample basis), and the beginning of an histogram of the
+volume (on a per-sample basis), and the beginning of a histogram of the
 registered volume values (from the maximum value to a cumulated 1/1000 of
 the samples).
 

doc/libswresample.texi

@@ -20,7 +20,7 @@ Specifically, this library performs the following conversions:
 @itemize
 @item
 @emph{Resampling}: is the process of changing the audio rate, for
-example from an high sample rate of 44100Hz to 8000Hz. Audio
+example from a high sample rate of 44100Hz to 8000Hz. Audio
 conversion from high to low sample rate is a lossy process. Several
 resampling options and algorithms are available.
 

libavcodec/pgssubdec.c

@@ -98,7 +98,7 @@ static av_cold int close_decoder(AVCodecContext *avctx)
 /**
  * Decode the RLE data.
  *
- * The subtitle is stored as an Run Length Encoded image.
+ * The subtitle is stored as a Run Length Encoded image.
  *
  * @param avctx contains the current codec context
  * @param sub pointer to the processed subtitle data

libavcodec/utils.c

@@ -747,7 +747,7 @@ static int get_buffer_internal(AVCodecContext *avctx, AVFrame *frame, int flags)
 #if FF_API_GET_BUFFER
 FF_DISABLE_DEPRECATION_WARNINGS
     /*
-     * Wrap an old get_buffer()-allocated buffer in an bunch of AVBuffers.
+     * Wrap an old get_buffer()-allocated buffer in a bunch of AVBuffers.
      * We wrap each plane in its own AVBuffer. Each of those has a reference to
      * a dummy AVBuffer as its private data, unreffing it on free.
      * When all the planes are freed, the dummy buffer's free callback calls

libavfilter/f_ebur128.c

@@ -64,7 +64,7 @@
 #define HIST_SIZE  ((ABS_UP_THRES - ABS_THRES) * HIST_GRAIN + 1)
 
 /**
- * An histogram is an array of HIST_SIZE hist_entry storing all the energies
+ * A histogram is an array of HIST_SIZE hist_entry storing all the energies
  * recorded (with an accuracy of 1/HIST_GRAIN) of the loudnesses from ABS_THRES
  * (at 0) to ABS_UP_THRES (at HIST_SIZE-1).
  * This fixed-size system avoids the need of a list of energies growing

libavutil/pixdesc.h

@@ -203,7 +203,7 @@ const char *av_get_pix_fmt_name(enum AVPixelFormat pix_fmt);
 
 /**
  * Print in buf the string corresponding to the pixel format with
- * number pix_fmt, or an header if pix_fmt is negative.
+ * number pix_fmt, or a header if pix_fmt is negative.
  *
  * @param buf the buffer where to write the string
  * @param buf_size the size of buf