avcodec/mjpegdec: Print human readable string for APPx

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mjpegdec.c

@@ -1455,8 +1455,11 @@ static int mjpeg_decode_app(MJpegDecodeContext *s)
     id   = get_bits_long(&s->gb, 32);
     len -= 6;
 
-    if (s->avctx->debug & FF_DEBUG_STARTCODE)
-        av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X len=%d\n", id, len);
+    if (s->avctx->debug & FF_DEBUG_STARTCODE) {
+        char id_str[32];
+        av_get_codec_tag_string(id_str, sizeof(id_str), av_bswap32(id));
+        av_log(s->avctx, AV_LOG_DEBUG, "APPx (%s / %8X) len=%d\n", id_str, id, len);
+    }
 
     /* Buggy AVID, it puts EOI only at every 10th frame. */
     /* Also, this fourcc is used by non-avid files too, it holds some