diff --git a/subprojects/gst-libav/docs/gst_plugins_cache.json b/subprojects/gst-libav/docs/gst_plugins_cache.json
index b214fdcdd8..86d3ec6aee 100644
--- a/subprojects/gst-libav/docs/gst_plugins_cache.json
+++ b/subprojects/gst-libav/docs/gst_plugins_cache.json
@@ -5623,6 +5623,95 @@
                 },
                 "rank": "marginal"
             },
+            "avdec_m101": {
+                "author": "Wim Taymans <wim.taymans@gmail.com>, Ronald Bultje <rbultje@ronald.bitfreak.net>, Edward Hervey <bilboed@bilboed.com>",
+                "description": "libav m101 decoder",
+                "hierarchy": [
+                    "avdec_m101",
+                    "GstFFMpegVidDec",
+                    "GstVideoDecoder",
+                    "GstElement",
+                    "GstObject",
+                    "GInitiallyUnowned",
+                    "GObject"
+                ],
+                "klass": "Codec/Decoder/Video",
+                "pad-templates": {
+                    "sink": {
+                        "caps": "video/x-m101:\n",
+                        "direction": "sink",
+                        "presence": "always"
+                    },
+                    "src": {
+                        "caps": "video/x-raw:\n         format: { I420, YUY2, RGB, BGR, Y42B, Y444, YUV9, Y41B, GRAY8, RGB8P, I420, Y42B, Y444, UYVY, NV12, NV21, ARGB, RGBA, ABGR, BGRA, GRAY16_BE, GRAY16_LE, A420, RGB16, RGB15, I420_10BE, I420_10LE, I422_10BE, I422_10LE, Y444_10BE, Y444_10LE, GBR, GBR_10BE, GBR_10LE, A420_10BE, A420_10LE, A422_10BE, A422_10LE, A444_10BE, A444_10LE, GBRA, xRGB, RGBx, xBGR, BGRx, I420_12BE, I420_12LE, I422_12BE, I422_12LE, Y444_12BE, Y444_12LE, GBR_12BE, GBR_12LE, P010_10LE, GBRA_12BE, GBRA_12LE, GBRA_10BE, GBRA_10LE, VUYA, P012_LE, Y212_LE, Y410, Y412_LE }\n\nvideo/x-raw(format:Interlaced):\n         format: { I420, YUY2, RGB, BGR, Y42B, Y444, YUV9, Y41B, GRAY8, RGB8P, I420, Y42B, Y444, UYVY, NV12, NV21, ARGB, RGBA, ABGR, BGRA, GRAY16_BE, GRAY16_LE, A420, RGB16, RGB15, I420_10BE, I420_10LE, I422_10BE, I422_10LE, Y444_10BE, Y444_10LE, GBR, GBR_10BE, GBR_10LE, A420_10BE, A420_10LE, A422_10BE, A422_10LE, A444_10BE, A444_10LE, GBRA, xRGB, RGBx, xBGR, BGRx, I420_12BE, I420_12LE, I422_12BE, I422_12LE, Y444_12BE, Y444_12LE, GBR_12BE, GBR_12LE, P010_10LE, GBRA_12BE, GBRA_12LE, GBRA_10BE, GBRA_10LE, VUYA, P012_LE, Y212_LE, Y410, Y412_LE }\n interlace-mode: alternate\n",
+                        "direction": "src",
+                        "presence": "always"
+                    }
+                },
+                "properties": {
+                    "debug-mv": {
+                        "blurb": "Whether to print motion vectors on top of the image (deprecated, non-functional)",
+                        "conditionally-available": false,
+                        "construct": false,
+                        "construct-only": false,
+                        "controllable": false,
+                        "default": "false",
+                        "mutable": "null",
+                        "readable": true,
+                        "type": "gboolean",
+                        "writable": true
+                    },
+                    "direct-rendering": {
+                        "blurb": "Enable direct rendering",
+                        "conditionally-available": false,
+                        "construct": false,
+                        "construct-only": false,
+                        "controllable": false,
+                        "default": "true",
+                        "mutable": "null",
+                        "readable": true,
+                        "type": "gboolean",
+                        "writable": true
+                    },
+                    "lowres": {
+                        "blurb": "At which resolution to decode images",
+                        "conditionally-available": false,
+                        "construct": false,
+                        "construct-only": false,
+                        "controllable": false,
+                        "default": "full (0)",
+                        "mutable": "null",
+                        "readable": true,
+                        "type": "GstLibAVVidDecLowres",
+                        "writable": true
+                    },
+                    "output-corrupt": {
+                        "blurb": "Whether libav should output frames even if corrupted",
+                        "conditionally-available": false,
+                        "construct": false,
+                        "construct-only": false,
+                        "controllable": false,
+                        "default": "true",
+                        "mutable": "null",
+                        "readable": true,
+                        "type": "gboolean",
+                        "writable": true
+                    },
+                    "skip-frame": {
+                        "blurb": "Which types of frames to skip during decoding",
+                        "conditionally-available": false,
+                        "construct": false,
+                        "construct-only": false,
+                        "controllable": false,
+                        "default": "default (0)",
+                        "mutable": "null",
+                        "readable": true,
+                        "type": "GstLibAVVidDecSkipFrame",
+                        "writable": true
+                    }
+                },
+                "rank": "marginal"
+            },
             "avdec_mace3": {
                 "author": "Wim Taymans <wim.taymans@gmail.com>, Ronald Bultje <rbultje@ronald.bitfreak.net>, Edward Hervey <bilboed@bilboed.com>",
                 "description": "libav mace3 decoder",
diff --git a/subprojects/gst-libav/ext/libav/gstavcodecmap.c b/subprojects/gst-libav/ext/libav/gstavcodecmap.c
index 867c87a5f1..35bf8ab044 100644
--- a/subprojects/gst-libav/ext/libav/gstavcodecmap.c
+++ b/subprojects/gst-libav/ext/libav/gstavcodecmap.c
@@ -1184,6 +1184,7 @@ gst_ffmpeg_codecid_is_known (enum AVCodecID codec_id)
     case AV_CODEC_ID_APTX:
     case AV_CODEC_ID_APTX_HD:
     case AV_CODEC_ID_AV1:
+    case AV_CODEC_ID_M101:
       return TRUE;
     default:
       return FALSE;
@@ -2820,6 +2821,11 @@ gst_ffmpeg_codecid_to_caps (enum AVCodecID codec_id,
         g_value_unset (&arr);
       }
       break;
+    case AV_CODEC_ID_M101:
+      caps =
+          gst_ff_vid_caps_new (context, NULL, codec_id, encode, "video/x-m101",
+          NULL);
+      break;
     default:
       GST_DEBUG ("Unknown codec ID %d, please add mapping here", codec_id);
       break;