Commit 81e07825e9 for ffmpeg

commit 81e07825e90961c4f6e2979a8d56b1dfeb4b47ae
Author: Rainbaby <r@bgr.jp>
Date:   Fri Aug 28 16:18:06 2026 +0900

    avcodec/cavsdec: check decode_seq_header() return value

    A rejected sequence header (unsupported profile, changed or invalid
    dimensions) was ignored, and every following picture then failed with a
    misleading "No sequence header decoded yet". A mid-stream dimension
    change now stops decoding instead of carrying on at the old size.

    Signed-off-by: Rainbaby <r@bgr.jp>

diff --git a/libavcodec/cavsdec.c b/libavcodec/cavsdec.c
index 54be9ae857..58613b2f4c 100644
--- a/libavcodec/cavsdec.c
+++ b/libavcodec/cavsdec.c
@@ -1271,7 +1271,9 @@ static int cavs_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
             return ret;
         switch (stc) {
         case CAVS_START_CODE:
-            decode_seq_header(h);
+            ret = decode_seq_header(h);
+            if (ret < 0)
+                return ret;
             break;
         case PIC_I_START_CODE:
             if (!h->got_keyframe) {