fix

configure

@@ -303,6 +303,7 @@ External library support:
   --enable-decklink        enable Blackmagic DeckLink I/O support [no]
   --enable-mbedtls         enable mbedTLS, needed for https support
                            if openssl, gnutls or libtls is not used [no]
+  --enable-librist         enable RIST via librist [no]
   --enable-mediacodec      enable Android MediaCodec support [no]
   --enable-mediafoundation enable encoding via MediaFoundation [auto]
   --enable-libmysofa       enable libmysofa, needed for sofalizer filter [no]

fftools/ffmpeg_opt.c

@@ -3371,7 +3371,7 @@ fail:
 
 static int opt_progress(void *optctx, const char *opt, const char *arg)
 {
-    progress_avio = avio;
+    progress_avio = NULL;
     return 0;
 }