print pix_fmt if its known instead of if the raw codec is used

Originally committed as revision 4162 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/utils.c

@@ -725,7 +725,7 @@ void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
         snprintf(buf, buf_size,
                  "Video: %s%s",
                  codec_name, enc->mb_decision ? " (hq)" : "");
-        if (enc->codec_id == CODEC_ID_RAWVIDEO) {
+        if (enc->pix_fmt != PIX_FMT_NONE) {
             snprintf(buf + strlen(buf), buf_size - strlen(buf),
                      ", %s",
                      avcodec_get_pix_fmt_name(enc->pix_fmt));