diff options
-rw-r--r-- | libavformat/movenc.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/libavformat/movenc.c b/libavformat/movenc.c index 29f5145857..c6c149d47d 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 |