Read preset files with suffix .avpreset

The preset files have been renamed some time ago.

CC: libav-stable@libav.org
(cherry picked from commit 050dc12778)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>

cmdutils.c

@@ -883,12 +883,12 @@ FILE *get_preset_file(char *filename, size_t filename_size,
         for (i = 0; i < 3 && !f; i++) {
             if (!base[i])
                 continue;
-            snprintf(filename, filename_size, "%s%s/%s.ffpreset", base[i],
+            snprintf(filename, filename_size, "%s%s/%s.avpreset", base[i],
                      i != 1 ? "" : "/.avconv", preset_name);
             f = fopen(filename, "r");
             if (!f && codec_name) {
                 snprintf(filename, filename_size,
-                         "%s%s/%s-%s.ffpreset",
+                         "%s%s/%s-%s.avpreset",
                          base[i], i != 1 ? "" : "/.avconv", codec_name,
                          preset_name);
                 f = fopen(filename, "r");

cmdutils.h

@@ -345,11 +345,11 @@ int64_t guess_correct_pts(PtsCorrectionContext *ctx, int64_t pts, int64_t dts);
  * Get a file corresponding to a preset file.
  *
  * If is_path is non-zero, look for the file in the path preset_name.
- * Otherwise search for a file named arg.ffpreset in the directories
+ * Otherwise search for a file named arg.avpreset in the directories
  * $AVCONV_DATADIR (if set), $HOME/.avconv, and in the datadir defined
  * at configuration time, in that order. If no such file is found and
  * codec_name is defined, then search for a file named
- * codec_name-preset_name.ffpreset in the above-mentioned directories.
+ * codec_name-preset_name.avpreset in the above-mentioned directories.
  *
  * @param filename buffer where the name of the found filename is written
  * @param filename_size size in bytes of the filename buffer