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commit 3b3dc211fed40e7e4f627dffd6a4e221eb481880
Author:     James Almer <[email protected]>
AuthorDate: Tue Oct 20 20:53:05 2026 -0300
Commit:     James Almer <[email protected]>
CommitDate: Tue Oct 20 21:23:04 2026 -0300

    avformat/mov: don't error out on invalid gain map payloads
    
    Unless it's requested by the user's compliant level.
    Allows demuxing some seemingly non spec-compliant files in the wild again 
after
    the recent Gain Map support addition.
    
    Signed-off-by: James Almer <[email protected]>
---
 libavformat/mov.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 870cb9703e..910df844dc 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -11683,9 +11683,12 @@ static int 
mov_parse_heif_layered_video_tmap(AVFormatContext *s, const HEIFGroup
 
     err = av_gain_map_params_from_iso21496(gain, payload, 
tmap->item->extent_length - 1);
     av_freep(&payload);
-    if (err < 0)
+    if (err < 0) {
+        av_log(s, AV_LOG_ERROR, "Invalid ISO 21496-1 gain map payload\n");
+        ff_remove_stream_group(s, stg);
+        err = (s->error_recognition & (AV_EF_COMPLIANT|AV_EF_EXPLODE)) ? 
AVERROR_INVALIDDATA : 0;
         goto fail;
-
+    }
     for (int j = 0; j < tmap->nb_items; j++) {
         HEIFItem *item = tmap->item_list[j];
         AVPacketSideData *sd;

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