On Fri, 13 Jun 2025, Zhao Zhili wrote:

From: Zhao Zhili <zhiliz...@tencent.com>

The segment_duration must not be set to zero when writing the moov
atom for the second time. This is related to edit lists in standard
MP4 files.
---
libavformat/movenc.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index cd5b45f6fe..a651d6d618 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -4036,8 +4036,13 @@ static int mov_write_edts_tag(AVIOContext *pb, 
MOVMuxContext *mov,
    /* For fragmented files, we don't know the full length yet. Setting
     * duration to 0 allows us to only specify the offset, including
     * the rest of the content (from all future fragments) without specifying
-     * an explicit duration. */
-    if (mov->flags & FF_MOV_FLAG_FRAGMENT)
+     * an explicit duration.
+     *
+     * For hybrid_fragmented during mov_write_trailer (mov->moov_written != 0),
+     * don't reset duration to zero.
+     */
+    if (mov->flags & FF_MOV_FLAG_FRAGMENT &&
+        !(mov->flags & FF_MOV_FLAG_HYBRID_FRAGMENTED && mov->moov_written))
        duration = 0;

    /* duration */
--
2.46.0

LGTM, this sounds reasonable to me.

// Martin

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