diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
index 1244cc4e03..c0a81c811a 100644
--- a/doc/ffmpeg.texi
+++ b/doc/ffmpeg.texi
@@ -1042,7 +1042,7 @@ ffmpeg -i h264.mp4 -c:v copy -bsf:v h264_mp4toannexb -an out.h264
 ffmpeg -i file.mov -an -vn -bsf:s mov2textsub -c:s copy -f rawvideo sub.txt
 @end example
 
-@item -tag[:@var{stream_specifier}] @var{codec_tag} (@emph{per-stream})
+@item -tag[:@var{stream_specifier}] @var{codec_tag} (@emph{input/output,per-stream})
 Force a tag/fourcc for matching streams.
 
 @item -timecode @var{hh}:@var{mm}:@var{ss}SEP@var{ff}
diff --git a/ffmpeg_opt.c b/ffmpeg_opt.c
index 5db961a1fa..7b4630fb25 100644
--- a/ffmpeg_opt.c
+++ b/ffmpeg_opt.c
@@ -559,13 +559,14 @@ static AVCodec *choose_decoder(OptionsContext *o, AVFormatContext *s, AVStream *
 static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
 {
     int i;
-    char *next, *codec_tag = NULL;
 
     for (i = 0; i < ic->nb_streams; i++) {
         AVStream *st = ic->streams[i];
         AVCodecContext *dec = st->codec;
         InputStream *ist = av_mallocz(sizeof(*ist));
         char *framerate = NULL, *hwaccel = NULL, *hwaccel_device = NULL;
+        char *codec_tag = NULL;
+        char *next;
 
         if (!ist)
             exit_program(1);
@@ -2780,7 +2781,7 @@ const OptionDef options[] = {
     { "frames",         OPT_INT64 | HAS_ARG | OPT_SPEC | OPT_OUTPUT, { .off = OFFSET(max_frames) },
         "set the number of frames to record", "number" },
     { "tag",            OPT_STRING | HAS_ARG | OPT_SPEC |
-                        OPT_EXPERT | OPT_OUTPUT,                     { .off = OFFSET(codec_tags) },
+                        OPT_EXPERT | OPT_OUTPUT | OPT_INPUT,         { .off = OFFSET(codec_tags) },
         "force codec tag/fourcc", "fourcc/tag" },
     { "q",              HAS_ARG | OPT_EXPERT | OPT_DOUBLE |
                         OPT_SPEC | OPT_OUTPUT,                       { .off = OFFSET(qscale) },