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-rw-r--r--libavformat/swfenc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libavformat/swfenc.c b/libavformat/swfenc.c
index 3733a0442c..cada45ef9a 100644
--- a/libavformat/swfenc.c
+++ b/libavformat/swfenc.c
@@ -500,7 +500,7 @@ static int swf_write_trailer(AVFormatContext *s)
put_swf_end_tag(s);
/* patch file size and number of frames if not streamed */
- if (s->pb->seekable && video_par) {
+ if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && video_par) {
file_size = avio_tell(pb);
avio_seek(pb, 4, SEEK_SET);
avio_wl32(pb, file_size);