On 4/2/2021 12:38 PM, Andreas Rheinhardt wrote:
This is a regression since switching to the generic CBS BSF code.

Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com>
---
Will apply this patchset soon.

  libavcodec/h264_metadata_bsf.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/h264_metadata_bsf.c b/libavcodec/h264_metadata_bsf.c
index 6e58c0be1d..06d23e3142 100644
--- a/libavcodec/h264_metadata_bsf.c
+++ b/libavcodec/h264_metadata_bsf.c
@@ -466,7 +466,7 @@ static int h264_metadata_update_fragment(AVBSFContext *bsf, 
AVPacket *pkt,
          if (ctx->aud == BSF_ELEMENT_REMOVE)
              ff_cbs_delete_unit(au, 0);
      } else {
-        if (ctx->aud == BSF_ELEMENT_INSERT) {
+        if (pkt && ctx->aud == BSF_ELEMENT_INSERT) {
              err = h264_metadata_insert_aud(bsf, au);
              if (err < 0)
                  return err;

LGTM. And please backport it, too.
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