tools: Wording and formatting cosmetics

tools/graph2dot.c

@@ -36,7 +36,7 @@
 
 static void usage(void)
 {
-    printf("Convert a libavfilter graph to a dot file\n");
+    printf("Convert a libavfilter graph to a dot file.\n");
     printf("Usage: graph2dot [OPTIONS]\n");
     printf("\n"
            "Options:\n"
@@ -133,7 +133,7 @@ int main(int argc, char **argv)
         infilename = "/dev/stdin";
     infile = fopen(infilename, "r");
     if (!infile) {
-        fprintf(stderr, "Impossible to open input file '%s': %s\n",
+        fprintf(stderr, "Failed to open input file '%s': %s\n",
                 infilename, strerror(errno));
         return 1;
     }
@@ -142,7 +142,7 @@ int main(int argc, char **argv)
         outfilename = "/dev/stdout";
     outfile = fopen(outfilename, "w");
     if (!outfile) {
-        fprintf(stderr, "Impossible to open output file '%s': %s\n",
+        fprintf(stderr, "Failed to open output file '%s': %s\n",
                 outfilename, strerror(errno));
         return 1;
     }
@@ -175,7 +175,7 @@ int main(int argc, char **argv)
     avfilter_register_all();
 
     if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
-        fprintf(stderr, "Impossible to parse the graph description\n");
+        fprintf(stderr, "Failed to parse the graph description\n");
         return 1;
     }
 

tools/pktdumper.c

@@ -31,18 +31,18 @@
 #include <io.h>
 #endif
 
-#define FILENAME_BUF_SIZE 4096
-
 #include "libavutil/avstring.h"
 #include "libavutil/time.h"
 #include "libavformat/avformat.h"
 
+#define FILENAME_BUF_SIZE 4096
 #define PKTFILESUFF "_%08" PRId64 "_%02d_%010" PRId64 "_%06d_%c.bin"
 
 static int usage(int ret)
 {
-    fprintf(stderr, "dump (up to maxpkts) AVPackets as they are demuxed by libavformat.\n");
-    fprintf(stderr, "each packet is dumped in its own file named like `basename file.ext`_$PKTNUM_$STREAMINDEX_$STAMP_$SIZE_$FLAGS.bin\n");
+    fprintf(stderr, "Dump (up to maxpkts) AVPackets as they are demuxed by libavformat.\n");
+    fprintf(stderr, "Each packet is dumped in its own file named like\n");
+    fprintf(stderr, "$(basename file.ext)_$PKTNUM_$STREAMINDEX_$STAMP_$SIZE_$FLAGS.bin\n");
     fprintf(stderr, "pktdumper [-nw] file [maxpkts]\n");
     fprintf(stderr, "-n\twrite No file at all, only demux.\n");
     fprintf(stderr, "-w\tWait at end of processing instead of quitting.\n");
@@ -79,7 +79,7 @@ int main(int argc, char **argv)
     if (strrchr(fntemplate, '.'))
         *strrchr(fntemplate, '.') = '\0';
     if (strchr(fntemplate, '%')) {
-        fprintf(stderr, "can't use filenames containing '%%'\n");
+        fprintf(stderr, "cannot use filenames containing '%%'\n");
         return usage(1);
     }
     if (strlen(fntemplate) + sizeof(PKTFILESUFF) >= sizeof(fntemplate) - 1) {