Hi!

Attached patch allows to autodetect headerless flac files.

Please comment, Carl Eugen
diff --git a/libavformat/flacdec.c b/libavformat/flacdec.c
index 1a8dc19..60551d0 100644
--- a/libavformat/flacdec.c
+++ b/libavformat/flacdec.c
@@ -178,6 +178,8 @@ fail:
 
 static int flac_probe(AVProbeData *p)
 {
+    if ((AV_RB16(p->buf) & 0xFFFE) == 0xFFF8 && p->buf[2] & 0xF0 && p->buf[2] 
^ 0x0F)
+        return AVPROBE_SCORE_EXTENSION / 4;
     if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4))
         return 0;
     return AVPROBE_SCORE_EXTENSION;
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