Commit e4fa18c220 for ffmpeg

commit e4fa18c2206bb626ab5ad76c8fb055cf8fa26ba1
Author: James Almer <jamrial@gmail.com>
Date:   Wed Sep 30 13:39:50 2026 -0300

    avcodec/libmpeghdec: don't use extradata for streams with in-band config configuration

    The decoder seems to accept it but then will not output any frame at all.

    Signed-off-by: James Almer <jamrial@gmail.com>

diff --git a/libavcodec/libmpeghdec.c b/libavcodec/libmpeghdec.c
index 49e7a5b1ec..29627b8f52 100644
--- a/libavcodec/libmpeghdec.c
+++ b/libavcodec/libmpeghdec.c
@@ -114,7 +114,8 @@ static av_cold int mpegh3dadec_init(AVCodecContext *avctx)
         return AVERROR_EXTERNAL;
     }

-    if (avctx->extradata_size) {
+    if (avctx->codec_tag != MKTAG('m', 'h', 'm', '1') &&
+        avctx->codec_tag != MKTAG('m', 'h', 'm', '2') && avctx->extradata_size) {
         if (mpeghdecoder_setMhaConfig(s->decoder, avctx->extradata,
                                       avctx->extradata_size)) {
             av_log(avctx, AV_LOG_ERROR, "Unable to set MHA configuration\n");