lavf: add V as a video stream specifier which is not an attached picture

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Marton Balint <cus@passwd.hu>

doc/fftools-common-opts.texi

@@ -36,8 +36,10 @@ Possible forms of stream specifiers are:
 Matches the stream with this index. E.g. @code{-threads:1 4} would set the
 thread count for the second stream to 4.
 @item @var{stream_type}[:@var{stream_index}]
-@var{stream_type} is one of following: 'v' for video, 'a' for audio, 's' for subtitle,
-'d' for data, and 't' for attachments. If @var{stream_index} is given, then it matches
+@var{stream_type} is one of following: 'v' or 'V' for video, 'a' for audio, 's'
+for subtitle, 'd' for data, and 't' for attachments. 'v' matches all video
+streams, 'V' only matches video streams which are not attached pictures, video
+thumbnails or cover arts.  If @var{stream_index} is given, then it matches
 stream number @var{stream_index} of this type. Otherwise, it matches all
 streams of this type.
 @item p:@var{program_id}[:@var{stream_index}]

libavformat/utils.c

@@ -4312,8 +4312,9 @@ int avformat_match_stream_specifier(AVFormatContext *s, AVStream *st,
     if (*spec <= '9' && *spec >= '0') /* opt:index */
         return strtol(spec, NULL, 0) == st->index;
     else if (*spec == 'v' || *spec == 'a' || *spec == 's' || *spec == 'd' ||
-             *spec == 't') { /* opt:[vasdt] */
+             *spec == 't' || *spec == 'V') { /* opt:[vasdtV] */
         enum AVMediaType type;
+        int nopic = 0;
 
         switch (*spec++) {
         case 'v': type = AVMEDIA_TYPE_VIDEO;      break;
@@ -4321,15 +4322,20 @@ int avformat_match_stream_specifier(AVFormatContext *s, AVStream *st,
         case 's': type = AVMEDIA_TYPE_SUBTITLE;   break;
         case 'd': type = AVMEDIA_TYPE_DATA;       break;
         case 't': type = AVMEDIA_TYPE_ATTACHMENT; break;
+        case 'V': type = AVMEDIA_TYPE_VIDEO; nopic = 1; break;
         default:  av_assert0(0);
         }
         if (type != st->codec->codec_type)
             return 0;
+        if (nopic && (st->disposition & AV_DISPOSITION_ATTACHED_PIC))
+            return 0;
         if (*spec++ == ':') { /* possibly followed by :index */
             int i, index = strtol(spec, NULL, 0);
             for (i = 0; i < s->nb_streams; i++)
-                if (s->streams[i]->codec->codec_type == type && index-- == 0)
-                   return i == st->index;
+                if (s->streams[i]->codec->codec_type == type &&
+                    !(nopic && (st->disposition & AV_DISPOSITION_ATTACHED_PIC)) &&
+                    index-- == 0)
+                    return i == st->index;
             return 0;
         }
         return 1;