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-rw-r--r--libavformat/movenc.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 496158c10a..4ed99b7ea3 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -2189,9 +2189,11 @@ static int mov_write_tfhd_tag(AVIOContext *pb, MOVTrack *track,
/* Don't set a default sample size, the silverlight player refuses
* to play files with that set. Don't set a default sample duration,
- * WMP freaks out if it is set. */
+ * WMP freaks out if it is set. Don't set a base data offset, PIFF
+ * file format says it MUST NOT be set. */
if (track->mode == MODE_ISM)
- flags &= ~(MOV_TFHD_DEFAULT_SIZE | MOV_TFHD_DEFAULT_DURATION);
+ flags &= ~(MOV_TFHD_DEFAULT_SIZE | MOV_TFHD_DEFAULT_DURATION |
+ MOV_TFHD_BASE_DATA_OFFSET);
avio_wb32(pb, 0); /* size placeholder */
ffio_wfourcc(pb, "tfhd");