Introduce FFMPEG_FORCE_NOCOLOR, with the same meaning and use of

NO_COLOR (but properly prefixed for avoiding namespace conflicts).

Originally committed as revision 25899 to svn://svn.ffmpeg.org/ffmpeg/trunk

2 files changed, 6 insertions, 4 deletions

diff --git a/doc/fftools-common-opts.texi b/doc/fftools-common-opts.texi
index 7f192f7..c362a17 100644
--- a/doc/fftools-common-opts.texi
+++ b/doc/fftools-common-opts.texi
@@ -84,7 +84,8 @@ Set the logging level used by the library.
 
 By default the program logs to stderr, if coloring is supported by the
 terminal, colors are used to mark errors and warnings. Log coloring
-can be disabled setting the environment variable @env{NO_COLOR}, or can
-be forced setting the environment variable @env{FFMPEG_FORCE_COLOR}.
+can be disabled setting the environment variable
+@env{FFMPEG_FORCE_NOCOLOR} or @env{NO_COLOR}, or can be forced setting
+the environment variable @env{FFMPEG_FORCE_COLOR}.
 
 @end table
diff --git a/libavutil/log.c b/libavutil/log.c
index 1975bab..0388e0a 100644
--- a/libavutil/log.c
+++ b/libavutil/log.c
@@ -62,9 +62,10 @@ static void colored_fputs(int level, const char *str){
             background = attr_orig & 0xF0;
         }
 #elif HAVE_ISATTY
-        use_color= !getenv("NO_COLOR") && (getenv("TERM") && isatty(2) || getenv("FFMPEG_FORCE_COLOR"));
+        use_color= !getenv("NO_COLOR") && !getenv("FFMPEG_FORCE_NOCOLOR") &&
+            (getenv("TERM") && isatty(2) || getenv("FFMPEG_FORCE_COLOR"));
 #else
-        use_color= getenv("FFMPEG_FORCE_COLOR") && !getenv("NO_COLOR");
+        use_color= getenv("FFMPEG_FORCE_COLOR") && !getenv("NO_COLOR") && !getenv("FFMPEG_FORCE_NOCOLOR");
 #endif
     }