[FFmpeg-devel] [PATCH] mov: fix seek to next root atom in fragmented mp4

[John Stebbins]

If some but not all moof's are referenced in an sidx, whole fragments
were being skipped.

Fixes tickets 7377, 7389, and 8502
May also fix 8070 but the sample links expired, so I can't test.
---
 libavformat/mov.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index f280f360b6..8ed8b7f6e9 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -7724,7 +7724,8 @@ static int mov_switch_root(AVFormatContext *s, int64_t target, int index)
     mov->next_root_atom = 0;
     if (index < 0 || index >= mov->frag_index.nb_items)
         index = search_frag_moof_offset(&mov->frag_index, target);
-    if (index < mov->frag_index.nb_items) {
+    if (index < mov->frag_index.nb_items &&
+        mov->frag_index.item[index].moof_offset == target) {
         if (index + 1 < mov->frag_index.nb_items)
             mov->next_root_atom = mov->frag_index.item[index + 1].moof_offset;
         if (mov->frag_index.item[index].headers_read)
-- 
2.25.1