---
libavformat/movenc.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 29f5145..c6c149d 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -3141,8 +3141,11 @@ 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))
+ (s->flags & AVFMT_FLAG_CUSTOM_IO)) {
+ av_log(s, AV_LOG_WARNING, "The faststart flag is incompatible "
+ "with fragmentation and custom IO, disabling faststart\n");
mov->flags &= ~FF_MOV_FLAG_FASTSTART;
+ }
}
/* Non-seekable output is ok if using fragmentation. If ism_lookahead
--
1.7.9.4
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