On 29/10/14 11:14, Martin Storsjö wrote:
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;
          }
      }


Ok.
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