diff -up firefox-140.1.0/media/ffvpx/libavcodec/av1dec.c.build-ffvpx firefox-140.1.0/media/ffvpx/libavcodec/av1dec.c
--- firefox-140.1.0/media/ffvpx/libavcodec/av1dec.c.build-ffvpx	2025-07-14 19:14:53.000000000 +0200
+++ firefox-140.1.0/media/ffvpx/libavcodec/av1dec.c	2025-07-31 13:02:48.131126439 +0200
@@ -904,7 +904,7 @@ static av_cold int av1_decode_init(AVCod
         ff_cbs_fragment_reset(&s->current_obu);
     }
 
-    s->dovi.logctx = avctx;
+    s->dovi.logctx = (AVContext *) avctx;
     s->dovi.cfg.dv_profile = 10; // default for AV1
     sd = ff_get_coded_side_data(avctx, AV_PKT_DATA_DOVI_CONF);
     if (sd && sd->size >= sizeof(s->dovi.cfg))
diff -up firefox-140.1.0/media/ffvpx/libavcodec/libdav1d.c.build-ffvpx firefox-140.1.0/media/ffvpx/libavcodec/libdav1d.c
--- firefox-140.1.0/media/ffvpx/libavcodec/libdav1d.c.build-ffvpx	2025-07-14 19:14:54.000000000 +0200
+++ firefox-140.1.0/media/ffvpx/libavcodec/libdav1d.c	2025-07-31 13:03:08.395175190 +0200
@@ -293,7 +293,7 @@ static av_cold int libdav1d_init(AVCodec
     c->delay = res > 1 ? res : 0;
 #endif
 
-    dav1d->dovi.logctx = c;
+    dav1d->dovi.logctx = (AVContext *) c;
     dav1d->dovi.cfg.dv_profile = 10; // default for AV1
     sd = ff_get_coded_side_data(c, AV_PKT_DATA_DOVI_CONF);
     if (sd && sd->size >= sizeof(dav1d->dovi.cfg))