diff --git a/libavformat/img2enc.c b/libavformat/img2enc.c
index dea4572209d4b22be26a60873b1509c995fc0f13..c485569d717db891fb1f7a9dc8772e9e4072b326 100644
--- a/libavformat/img2enc.c
+++ b/libavformat/img2enc.c
@@ -41,6 +41,7 @@ typedef struct {
 static int write_header(AVFormatContext *s)
 {
     VideoMuxData *img = s->priv_data;
+    AVStream *st = s->streams[0];
     const char *str;
 
     av_strlcpy(img->path, s->filename, sizeof(img->path));
@@ -52,7 +53,10 @@ static int write_header(AVFormatContext *s)
         img->is_pipe = 1;
 
     str = strrchr(img->path, '.');
-    img->split_planes = str && !av_strcasecmp(str + 1, "y");
+    img->split_planes =     str
+                         && !av_strcasecmp(str + 1, "y")
+                         && s->nb_streams == 1
+                         && st->codec->codec_id == AV_CODEC_ID_RAWVIDEO;
     return 0;
 }