ENOMEM is better, yes ...

Originally committed as revision 13535 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/yuv4mpeg.c

@@ -323,7 +323,7 @@ static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
 
     st = av_new_stream(s, 0);
     if(!st)
-        return -1;
+        return AVERROR(ENOMEM);
     st->codec->width = width;
     st->codec->height = height;
     av_reduce(&raten, &rated, raten, rated, (1UL<<31)-1);