The custom IO flag actually never is set for muxers, only for
demuxers, so the check was pointless (unless a user intentionally
would set the flag to signal using custom IO).
---
 libavformat/movenc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index fe3b154..8119a3f 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -3448,10 +3448,9 @@ static int mov_write_header(AVFormatContext *s)
 
     /* faststart: moov at the beginning of the file, if supported */
     if (mov->flags & FF_MOV_FLAG_FASTSTART) {
-        if ((mov->flags & FF_MOV_FLAG_FRAGMENT) ||
-            (s->flags & AVFMT_FLAG_CUSTOM_IO)) {
+        if (mov->flags & FF_MOV_FLAG_FRAGMENT) {
             av_log(s, AV_LOG_WARNING, "The faststart flag is incompatible "
-                   "with fragmentation and custom IO, disabling faststart\n");
+                   "with fragmentation, disabling faststart\n");
             mov->flags &= ~FF_MOV_FLAG_FASTSTART;
         }
     }
-- 
1.9.3 (Apple Git-50)

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