Commit d71901757c for ffmpeg

commit d71901757c646501ff17bd76d5b6927809f58835
Author: AJ Granowski <AJGranowski@users.noreply.github.com>
Date:   Wed Sep 30 15:54:58 2026 -0500

    avcodec/dnxhddec: Increase alpha channel `avpriv_request_sample` verbosity

    The alpha channel of VC-3 bitstreams are encoded either as DCT-encoded or RLE-encoded alpha blocks. This change differentiates those two when requesting a sample.
    This is an incremental change towards adding DCT block alpha decoding for the DNxHD codec. Following PRs will work from the VC-3 standard https://pub.smpte.org/doc/st2019-1/20160518-pub/ 8.1.2

    Related tickets: https://trac.ffmpeg.org/ticket/3707

diff --git a/libavcodec/dnxhddec.c b/libavcodec/dnxhddec.c
index 7ec61f9ebd..7ba01351d9 100644
--- a/libavcodec/dnxhddec.c
+++ b/libavcodec/dnxhddec.c
@@ -208,8 +208,13 @@ static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
     ctx->mbaff = (buf[0x6] >> 5) & 1;
     ctx->alpha = buf[0x7] & 1;
     ctx->lla   = (buf[0x7] >> 1) & 1;
-    if (ctx->alpha)
-        avpriv_request_sample(ctx->avctx, "alpha");
+    if (ctx->alpha) {
+        if (ctx->lla) {
+            avpriv_request_sample(ctx->avctx, "RLE block alpha decoding");
+        } else {
+            avpriv_request_sample(ctx->avctx, "DCT block alpha decoding");
+        }
+    }

     ctx->height = AV_RB16(buf + 0x18);
     ctx->width  = AV_RB16(buf + 0x1a);