This is an automated email from the git hooks/post-receive script. Git pushed a commit to branch release/7.1 in repository ffmpeg. commit 37deee5cab866a6694414524f6ec67cba43fb880 Author: James Almer <jamrial@gmail.com> AuthorDate: Fri Feb 27 10:38:14 2026 -0300 Commit: James Almer <jamrial@gmail.com> CommitDate: Fri Feb 27 12:20:27 2026 -0300 avformat/mov: fix setting iamf stream id offsets If we were to add the highest id of a non iamf stream as offset to iamf stream ids, and one of the latter was 0, then an id overlap would ocurr. Signed-off-by: James Almer <jamrial@gmail.com> (cherry picked from commit 51aef95ba156b7848eca5445f0f59b091c3b1004) --- libavformat/mov.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/libavformat/mov.c b/libavformat/mov.c index 7c7aced6ca..6fddce9552 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -10182,7 +10182,7 @@ static AVStream *mov_find_reference_track(AVFormatContext *s, AVStream *st, static void fix_stream_ids(AVFormatContext *s) { - int highest_id = 0; + int highest_id = 0, lowest_iamf_id = INT_MAX; for (int i = 0; i < s->nb_streams; i++) { const AVStream *st = s->streams[i]; @@ -10190,7 +10190,21 @@ static void fix_stream_ids(AVFormatContext *s) if (!sc->iamf) highest_id = FFMAX(highest_id, st->id); } - highest_id += !highest_id; + + for (int i = 0; i < s->nb_stream_groups; i++) { + AVStreamGroup *stg = s->stream_groups[i]; + if (stg->type != AV_STREAM_GROUP_PARAMS_IAMF_AUDIO_ELEMENT) + continue; + for (int j = 0; j < stg->nb_streams; j++) { + AVStream *st = stg->streams[j]; + lowest_iamf_id = FFMIN(lowest_iamf_id, st->id); + } + } + + if (highest_id < lowest_iamf_id) + return; + + highest_id += !lowest_iamf_id; for (int i = 0; highest_id > 1 && i < s->nb_stream_groups; i++) { AVStreamGroup *stg = s->stream_groups[i]; if (stg->type != AV_STREAM_GROUP_PARAMS_IAMF_AUDIO_ELEMENT)