Improve long names for FFM muxer and demuxer:

change "ffm format" to "FFM (FFserver live feed) format".

Originally committed as revision 14438 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/ffmdec.c

@@ -477,7 +477,7 @@ static int ffm_probe(AVProbeData *p)
 
 AVInputFormat ffm_demuxer = {
     "ffm",
-    NULL_IF_CONFIG_SMALL("ffm format"),
+    NULL_IF_CONFIG_SMALL("FFM (FFserver live feed) format"),
     sizeof(FFMContext),
     ffm_probe,
     ffm_read_header,

libavformat/ffmenc.c

@@ -237,7 +237,7 @@ static int ffm_write_trailer(AVFormatContext *s)
 
 AVOutputFormat ffm_muxer = {
     "ffm",
-    NULL_IF_CONFIG_SMALL("ffm format"),
+    NULL_IF_CONFIG_SMALL("FFM (FFserver live feed) format"),
     "",
     "ffm",
     sizeof(FFMContext),