On Mon, 26 May 2025, Gyan Doshi wrote:

Usage of hybrid_fragmented and faststart together can result in files with
loss of sync and bitstream parsing errors upon playback.
---
libavformat/movenc.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 4bc8bd1b2a..9392ba5370 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -7731,6 +7731,12 @@ static int mov_init(AVFormatContext *s)
                      FF_MOV_FLAG_FRAG_EVERY_FRAME))
        mov->flags |= FF_MOV_FLAG_FRAGMENT;

+    if (mov->flags & FF_MOV_FLAG_HYBRID_FRAGMENTED &&
+        mov->flags & FF_MOV_FLAG_FASTSTART) {
+        av_log(s, AV_LOG_ERROR, "Setting both hybrid_fragmented and faststart is 
not supported.\n");
+        return AVERROR(EINVAL);
+    }
+

Ok

// Martin

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