diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 38f6f07680..f0216ad64b 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -506,6 +506,7 @@ OBJS-$(CONFIG_MWSC_DECODER)            += mwsc.o
 OBJS-$(CONFIG_MXPEG_DECODER)           += mxpegdec.o
 OBJS-$(CONFIG_NELLYMOSER_DECODER)      += nellymoserdec.o nellymoser.o
 OBJS-$(CONFIG_NELLYMOSER_ENCODER)      += nellymoserenc.o nellymoser.o
+OBJS-$(CONFIG_NOTCHLC_DECODER)         += notchlc.o
 OBJS-$(CONFIG_NUV_DECODER)             += nuv.o rtjpeg.o
 OBJS-$(CONFIG_ON2AVC_DECODER)          += on2avc.o on2avcdata.o
 OBJS-$(CONFIG_OPUS_DECODER)            += opusdec.o opus.o opus_celt.o opus_rc.o \
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 54d40ebdbc..d18a318bc2 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -224,6 +224,7 @@ extern AVCodec ff_mvdv_decoder;
 extern AVCodec ff_mvha_decoder;
 extern AVCodec ff_mwsc_decoder;
 extern AVCodec ff_mxpeg_decoder;
+extern AVCodec ff_notchlc_decoder;
 extern AVCodec ff_nuv_decoder;
 extern AVCodec ff_paf_video_decoder;
 extern AVCodec ff_pam_encoder;
diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
index 93433b5a27..b94ad0b1e6 100644
--- a/libavcodec/codec_desc.c
+++ b/libavcodec/codec_desc.c
@@ -1763,6 +1763,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("MidiVid 3.0"),
         .props     = AV_CODEC_PROP_LOSSY,
     },
+    {
+        .id        = AV_CODEC_ID_NOTCHLC,
+        .type      = AVMEDIA_TYPE_VIDEO,
+        .name      = "notchlc",
+        .long_name = NULL_IF_CONFIG_SMALL("NotchLC"),
+        .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
+    },
 
     /* various PCM "codecs" */
     {
diff --git a/libavcodec/codec_id.h b/libavcodec/codec_id.h
index e7d6e059db..e95737c0a2 100644
--- a/libavcodec/codec_id.h
+++ b/libavcodec/codec_id.h
@@ -291,6 +291,7 @@ enum AVCodecID {
     AV_CODEC_ID_MVHA,
     AV_CODEC_ID_CDTOONS,
     AV_CODEC_ID_MV30,
+    AV_CODEC_ID_NOTCHLC,
 
     /* various PCM "codecs" */
     AV_CODEC_ID_FIRST_AUDIO = 0x10000,     ///< A dummy id pointing at the start of audio codecs
diff --git a/libavcodec/notchlc.c b/libavcodec/notchlc.c
new file mode 100644
index 0000000000..b75a2c72c9
--- /dev/null
+++ b/libavcodec/notchlc.c
@@ -0,0 +1,461 @@
+/*
+ * NotchLC decoder
+ * Copyright (c) 2020 Paul B Mahol
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define BITSTREAM_READER_LE
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "get_bits.h"
+#include "internal.h"
+#include "thread.h"
+
+typedef struct NotchLCContext {
+    unsigned compressed_size;
+    unsigned format;
+
+    uint8_t *uncompressed_buffer;
+    unsigned uncompressed_size;
+
+    unsigned texture_size_x;
+    unsigned texture_size_y;
+    unsigned y_data_row_offsets;
+    unsigned uv_offset_data_offset;
+    unsigned y_control_data_offset;
+    unsigned a_control_word_offset;
+    unsigned y_data_offset;
+    unsigned uv_data_offset;
+    unsigned y_data_size;
+    unsigned uv_count_size;
+    unsigned uv_count_offset;
+    unsigned a_count_size;
+    unsigned data_end;
+
+    GetByteContext gb;
+    PutByteContext pb;
+} NotchLCContext;
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    avctx->pix_fmt = AV_PIX_FMT_YUV444P12;
+    avctx->color_range = AVCOL_RANGE_JPEG;
+    avctx->colorspace = AVCOL_SPC_RGB;
+    avctx->color_primaries = AVCOL_PRI_BT709;
+    avctx->color_trc = AVCOL_TRC_IEC61966_2_1;
+
+    return 0;
+}
+
+#define HISTORY_SIZE (64 * 1024)
+
+static int lz4_decompress(AVCodecContext *avctx,
+                          GetByteContext *gb,
+                          PutByteContext *pb)
+{
+    unsigned reference_pos, match_length, delta, pos = 0;
+    uint8_t history[64 * 1024];
+
+    while (bytestream2_get_bytes_left(gb) > 0) {
+        uint8_t token = bytestream2_get_byte(gb);
+        unsigned num_literals = token >> 4;
+
+        if (num_literals == 15) {
+            unsigned char current;
+            do {
+                current = bytestream2_get_byte(gb);
+                num_literals += current;
+            } while (current == 255);
+        }
+
+        if (pos + num_literals < HISTORY_SIZE) {
+            bytestream2_get_buffer(gb, history + pos, num_literals);
+            pos += num_literals;
+        } else {
+            while (num_literals-- > 0) {
+                history[pos++] = bytestream2_get_byte(gb);
+                if (pos == HISTORY_SIZE) {
+                    bytestream2_put_buffer(pb, history, HISTORY_SIZE);
+                    pos = 0;
+                }
+            }
+        }
+
+        if (bytestream2_get_bytes_left(gb) <= 0)
+            break;
+
+        delta = bytestream2_get_byte(gb);
+        delta |= (unsigned)bytestream2_get_byte(gb) << 8;
+        if (delta == 0)
+            return 0;
+        match_length = 4 + (token & 0x0F);
+        if (match_length == 4 + 0x0F) {
+            uint8_t current;
+
+            do {
+                current = bytestream2_get_byte(gb);
+                match_length += current;
+            } while (current == 255);
+        }
+        reference_pos = (pos >= delta) ? (pos - delta) : (HISTORY_SIZE + pos - delta);
+        if (pos + match_length < HISTORY_SIZE && reference_pos + match_length < HISTORY_SIZE) {
+            if (pos >= reference_pos + match_length || reference_pos >= pos + match_length) {
+                memcpy(history + pos, history + reference_pos, match_length);
+                pos += match_length;
+            } else {
+                while (match_length-- > 0)
+                    history[pos++] = history[reference_pos++];
+            }
+        } else {
+            while (match_length-- > 0) {
+                history[pos++] = history[reference_pos++];
+                if (pos == HISTORY_SIZE) {
+                    bytestream2_put_buffer(pb, history, HISTORY_SIZE);
+                    pos = 0;
+                }
+                reference_pos %= HISTORY_SIZE;
+            }
+        }
+    }
+
+    bytestream2_put_buffer(pb, history, pos);
+
+    return bytestream2_tell_p(pb);
+}
+
+static int decode_blocks(AVCodecContext *avctx, AVFrame *p, ThreadFrame *frame,
+                         unsigned uncompressed_size)
+{
+    NotchLCContext *s = avctx->priv_data;
+    GetByteContext rgb, dgb, *gb = &s->gb;
+    GetBitContext bit;
+    int ylinesize, ulinesize, vlinesize, alinesize;
+    uint16_t *dsty, *dstu, *dstv, *dsta;
+    int ret;
+
+    s->texture_size_x = bytestream2_get_le32(gb);
+    s->texture_size_y = bytestream2_get_le32(gb);
+
+    s->uv_offset_data_offset = bytestream2_get_le32(gb);
+    if (s->uv_offset_data_offset >= UINT_MAX / 4)
+        return AVERROR_INVALIDDATA;
+    s->uv_offset_data_offset *= 4;
+    if (s->uv_offset_data_offset >= uncompressed_size)
+        return AVERROR_INVALIDDATA;
+
+    s->y_control_data_offset = bytestream2_get_le32(gb);
+    if (s->y_control_data_offset >= UINT_MAX / 4)
+        return AVERROR_INVALIDDATA;
+    s->y_control_data_offset *= 4;
+    if (s->y_control_data_offset >= uncompressed_size)
+        return AVERROR_INVALIDDATA;
+
+    s->a_control_word_offset = bytestream2_get_le32(gb);
+    if (s->a_control_word_offset >= UINT_MAX / 4)
+        return AVERROR_INVALIDDATA;
+    s->a_control_word_offset *= 4;
+    if (s->a_control_word_offset >= uncompressed_size)
+        return AVERROR_INVALIDDATA;
+
+    s->uv_data_offset = bytestream2_get_le32(gb);
+    if (s->uv_data_offset >= UINT_MAX / 4)
+        return AVERROR_INVALIDDATA;
+    s->uv_data_offset *= 4;
+    if (s->uv_data_offset >= uncompressed_size)
+        return AVERROR_INVALIDDATA;
+
+    s->y_data_size = bytestream2_get_le32(gb);
+    if (s->y_data_size >= UINT_MAX / 4)
+        return AVERROR_INVALIDDATA;
+
+    s->uv_count_size = bytestream2_get_le32(gb);
+    if (s->uv_count_size >= UINT_MAX / 4)
+        return AVERROR_INVALIDDATA;
+    s->uv_count_size *= 4;
+    if (s->uv_count_size >= uncompressed_size)
+        return AVERROR_INVALIDDATA;
+
+    s->a_count_size = bytestream2_get_le32(gb);
+    if (s->a_count_size >= UINT_MAX / 4)
+        return AVERROR_INVALIDDATA;
+    s->a_count_size *= 4;
+    if (s->a_count_size >= uncompressed_size)
+        return AVERROR_INVALIDDATA;
+
+    s->data_end = bytestream2_get_le32(gb);
+    if (s->data_end > uncompressed_size)
+        return AVERROR_INVALIDDATA;
+
+    s->y_data_row_offsets = bytestream2_tell(gb);
+    if (s->data_end <= s->y_data_size)
+        return AVERROR_INVALIDDATA;
+    s->y_data_offset = s->data_end - s->y_data_size;
+    if (s->y_data_offset <= s->uv_count_size)
+        return AVERROR_INVALIDDATA;
+    s->uv_count_offset = s->y_data_offset - s->uv_count_size;
+
+    if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
+        return ret;
+
+    rgb = *gb;
+    dgb = *gb;
+    bytestream2_seek(&rgb, s->y_data_row_offsets, SEEK_SET);
+    bytestream2_seek(gb, s->y_control_data_offset, SEEK_SET);
+
+    dsty = (uint16_t *)p->data[0];
+    dsta = (uint16_t *)p->data[3];
+    ylinesize = p->linesize[0] / 2;
+    alinesize = p->linesize[3] / 2;
+
+    for (int y = 0; y < avctx->height; y += 4) {
+        const unsigned row_offset = bytestream2_get_le32(&rgb);
+
+        bytestream2_seek(&dgb, s->y_data_offset + row_offset, SEEK_SET);
+
+        init_get_bits8(&bit, dgb.buffer, bytestream2_get_bytes_left(&dgb));
+        for (int x = 0; x < avctx->width; x += 4) {
+            unsigned item = bytestream2_get_le32(gb);
+            unsigned y_min = item & 4095;
+            unsigned y_max = (item >> 12) & 4095;
+            unsigned y_diff = y_max - y_min;
+            unsigned control[4];
+
+            control[0] = (item >> 24) & 3;
+            control[1] = (item >> 26) & 3;
+            control[2] = (item >> 28) & 3;
+            control[3] = (item >> 30) & 3;
+
+            for (int i = 0; i < 4; i++) {
+                const int nb_bits = control[i] + 1;
+                const int div = (1 << nb_bits) - 1;
+                const int add = div - 1;
+
+                dsty[x + i * ylinesize + 0] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
+                dsty[x + i * ylinesize + 1] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
+                dsty[x + i * ylinesize + 2] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
+                dsty[x + i * ylinesize + 3] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
+            }
+        }
+
+        dsty += 4 * ylinesize;
+        dsta += 4 * alinesize;
+    }
+
+    rgb = *gb;
+    dgb = *gb;
+    bytestream2_seek(&rgb, s->uv_offset_data_offset, SEEK_SET);
+    bytestream2_seek(gb, s->a_control_word_offset, SEEK_SET);
+
+    dstu = (uint16_t *)p->data[1];
+    dstv = (uint16_t *)p->data[2];
+    ulinesize = p->linesize[1] / 2;
+    vlinesize = p->linesize[2] / 2;
+
+    for (int y = 0; y < avctx->height; y += 16) {
+        for (int x = 0; x < avctx->width; x += 16) {
+            unsigned offset = bytestream2_get_le32(&rgb) * 4;
+            int u[16][16] = { 0 }, v[16][16] = { 0 };
+            int u0, v0, u1, v1, udif, vdif;
+            unsigned escape, is8x8, loc;
+
+            bytestream2_seek(&dgb, s->uv_data_offset + offset, SEEK_SET);
+
+            is8x8 = bytestream2_get_le16(&dgb);
+            escape = bytestream2_get_le16(&dgb);
+
+            if (escape == 0 && is8x8 == 0) {
+                u0 = bytestream2_get_byte(&dgb);
+                v0 = bytestream2_get_byte(&dgb);
+                u1 = bytestream2_get_byte(&dgb);
+                v1 = bytestream2_get_byte(&dgb);
+                loc = bytestream2_get_le32(&dgb);
+                u0 = (u0 << 4) | (u0 & 0xF);
+                v0 = (v0 << 4) | (v0 & 0xF);
+                u1 = (u1 << 4) | (u1 & 0xF);
+                v1 = (v1 << 4) | (v1 & 0xF);
+                udif = u1 - u0;
+                vdif = v1 - v0;
+
+                for (int i = 0; i < 16; i += 4) {
+                    for (int j = 0; j < 16; j += 4) {
+                        for (int ii = 0; ii < 4; ii++) {
+                            for (int jj = 0; jj < 4; jj++) {
+                                u[i + ii][j + jj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
+                                v[i + ii][j + jj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
+                            }
+                        }
+
+                        loc >>= 2;
+                    }
+                }
+            } else {
+                for (int i = 0; i < 16; i += 8) {
+                    for (int j = 0; j < 16; j += 8) {
+                        if (is8x8 & 1) {
+                            u0 = bytestream2_get_byte(&dgb);
+                            v0 = bytestream2_get_byte(&dgb);
+                            u1 = bytestream2_get_byte(&dgb);
+                            v1 = bytestream2_get_byte(&dgb);
+                            loc = bytestream2_get_le32(&dgb);
+                            u0 = (u0 << 4) | (u0 & 0xF);
+                            v0 = (v0 << 4) | (v0 & 0xF);
+                            u1 = (u1 << 4) | (u1 & 0xF);
+                            v1 = (v1 << 4) | (v1 & 0xF);
+                            udif = u1 - u0;
+                            vdif = v1 - v0;
+
+                            for (int ii = 0; ii < 8; ii += 2) {
+                                for (int jj = 0; jj < 8; jj += 2) {
+                                    for (int iii = 0; iii < 2; iii++) {
+                                        for (int jjj = 0; jjj < 2; jjj++) {
+                                            u[i + ii + iii][j + jj + jjj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
+                                            v[i + ii + iii][j + jj + jjj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
+                                        }
+                                    }
+
+                                    loc >>= 2;
+                                }
+                            }
+                        } else if (escape) {
+                            for (int ii = 0; ii < 8; ii += 4) {
+                                for (int jj = 0; jj < 8; jj += 4) {
+                                    u0 = bytestream2_get_byte(&dgb);
+                                    v0 = bytestream2_get_byte(&dgb);
+                                    u1 = bytestream2_get_byte(&dgb);
+                                    v1 = bytestream2_get_byte(&dgb);
+                                    loc = bytestream2_get_le32(&dgb);
+                                    u0 = (u0 << 4) | (u0 & 0xF);
+                                    v0 = (v0 << 4) | (v0 & 0xF);
+                                    u1 = (u1 << 4) | (u1 & 0xF);
+                                    v1 = (v1 << 4) | (v1 & 0xF);
+                                    udif = u1 - u0;
+                                    vdif = v1 - v0;
+
+                                    for (int iii = 0; iii < 4; iii++) {
+                                        for (int jjj = 0; jjj < 4; jjj++) {
+                                            u[i + ii + iii][j + jj + jjj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
+                                            v[i + ii + iii][j + jj + jjj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
+
+                                            loc >>= 2;
+                                        }
+                                    }
+                                }
+                            }
+                        }
+
+                        is8x8 >>= 1;
+                    }
+                }
+            }
+
+            for (int i = 0; i < 16; i++) {
+                for (int j = 0; j < 16; j++) {
+                    dstu[x + i * ulinesize + j] = u[i][j];
+                    dstv[x + i * vlinesize + j] = v[i][j];
+                }
+            }
+        }
+
+        dstu += 16 * ulinesize;
+        dstv += 16 * vlinesize;
+    }
+
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx,
+                        void *data, int *got_frame,
+                        AVPacket *avpkt)
+{
+    NotchLCContext *s = avctx->priv_data;
+    ThreadFrame frame = { .f = data };
+    GetByteContext *gb = &s->gb;
+    PutByteContext *pb = &s->pb;
+    unsigned uncompressed_size;
+    AVFrame *p = data;
+    int ret;
+
+    if (avpkt->size <= 40)
+        return AVERROR_INVALIDDATA;
+
+    bytestream2_init(gb, avpkt->data, avpkt->size);
+
+    if (bytestream2_get_le32(gb) != MKBETAG('N','L','C','1'))
+        return AVERROR_INVALIDDATA;
+
+    uncompressed_size = bytestream2_get_le32(gb);
+    s->compressed_size = bytestream2_get_le32(gb);
+    s->format = bytestream2_get_le32(gb);
+
+    if (s->format != 1 && s->format != 2) {
+        return AVERROR_PATCHWELCOME;
+    }
+
+    if (s->format == 1) {
+        av_fast_padded_malloc(&s->uncompressed_buffer, &s->uncompressed_size,
+                              uncompressed_size);
+        if (!s->uncompressed_buffer)
+            return AVERROR(ENOMEM);
+
+        bytestream2_init_writer(pb, s->uncompressed_buffer, s->uncompressed_size);
+
+        ret = lz4_decompress(avctx, gb, pb);
+        if (ret != uncompressed_size)
+            return AVERROR_INVALIDDATA;
+
+        bytestream2_init(gb, s->uncompressed_buffer, uncompressed_size);
+    }
+
+    ret = decode_blocks(avctx, p, &frame, uncompressed_size);
+    if (ret < 0)
+        return ret;
+
+    p->pict_type = AV_PICTURE_TYPE_I;
+    p->key_frame = 1;
+
+    *got_frame = 1;
+
+    return avpkt->size;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx)
+{
+    NotchLCContext *s = avctx->priv_data;
+
+    av_freep(&s->uncompressed_buffer);
+    s->uncompressed_size = 0;
+
+    return 0;
+}
+
+AVCodec ff_notchlc_decoder = {
+    .name             = "notchlc",
+    .long_name        = NULL_IF_CONFIG_SMALL("NotchLC"),
+    .type             = AVMEDIA_TYPE_VIDEO,
+    .id               = AV_CODEC_ID_NOTCHLC,
+    .priv_data_size   = sizeof(NotchLCContext),
+    .init             = decode_init,
+    .close            = decode_end,
+    .decode           = decode_frame,
+    .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
+};
diff --git a/libavformat/isom.c b/libavformat/isom.c
index eefe9277b4..44c7b13038 100644
--- a/libavformat/isom.c
+++ b/libavformat/isom.c
@@ -313,6 +313,8 @@ const AVCodecTag ff_codec_movvideo_tags[] = {
 
     { AV_CODEC_ID_PIXLET, MKTAG('p', 'x', 'l', 't') },
 
+    { AV_CODEC_ID_NOTCHLC, MKTAG('n', 'c', 'l', 'c') },
+
     { AV_CODEC_ID_NONE, 0 },
 };
 
diff --git a/libavformat/riff.c b/libavformat/riff.c
index bf6a8f47f8..162e2b1bf2 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -493,6 +493,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
     { AV_CODEC_ID_MVDV,         MKTAG('M', 'V', 'D', 'V') },
     { AV_CODEC_ID_MVHA,         MKTAG('M', 'V', 'H', 'A') },
     { AV_CODEC_ID_MV30,         MKTAG('M', 'V', '3', '0') },
+    { AV_CODEC_ID_NOTCHLC,      MKTAG('n', 'l', 'c', '1') },
     { AV_CODEC_ID_NONE,         0 }
 };
 
