diff --git a/configure b/configure
index d872213af7..83afcea5c6 100755
--- a/configure
+++ b/configure
@@ -3886,6 +3886,7 @@ frei0r_src_filter_deps="frei0r"
 fspp_filter_deps="gpl"
 fsync_filter_deps="avformat"
 gblur_vulkan_filter_deps="vulkan spirv_compiler"
+gopromax_opencl_filter_deps="opencl"
 hflip_vulkan_filter_deps="vulkan spirv_compiler"
 histeq_filter_deps="gpl"
 hqdn3d_filter_deps="gpl"
diff --git a/doc/filters.texi b/doc/filters.texi
index db2f4b7ea7..02d4ffa753 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -27201,6 +27201,84 @@ Apply dilation filter with threshold0 set to 30, threshold1 set 40, threshold2 s
 @end example
 @end itemize
 
+@anchor{gopromax_opencl}
+@section gopromax_opencl
+
+Apply transformation of the two GoPro Max video streams to equirectangular or equiangular-cubemap projection.
+
+This filter is designed to use directly GoPro .360 files.
+Native .360 files are sort of EAC files, in fact the front and rear lenses streams are the top and the bottom of the EAC projection.
+
+The .360 file contains two video streams.
+Most of cases, one is stream #0:0, and the other is stream #0:5.
+Please check actual stream number with @code{ffprobe} command.
+This filter combine two streams to single stream.
+
+The .360 contains also 2x64 bits of overlapped area.
+The filter blends overlapped images in these two areas.
+
+The filter accepts the following options:
+
+@table @option
+
+@item output
+Set format of the output video.
+
+Available formats:
+
+@table @samp
+
+@item e
+@item equirect
+Equirectangular projection.
+
+@item eac
+Equi-Angular Cubemap.
+
+@end table
+
+Default is @code{equirect}.
+
+@item w
+@item h
+Set the output video resolution.
+
+Default resolution depends on formats.
+
+@item overlap
+Set number of overlapped pixels on input .360 video.
+
+No need to specify this option for native .360 video file.
+This option is for rescaled video or future video format change.
+
+Default is @code{64}.
+
+@end table
+
+@subsection Example
+
+@itemize
+@item
+Convert .360 to Equirectangular projection.
+@example
+-i INPUT -filter_complex '[0:0]hwupload[a], [0:5]hwupload[b], [a][b]gopromax_opencl=w=4096:h=2048, hwdownload, format=yuvj420p' -map 0:a:0 -c:a copy OUTPUT
+@end example
+
+Two video streams (#0:0 and #0:5) are combined and converted to default equirectangular projection with specified resolution.
+First audio stream (GoPro AAC) is copied with the video stream.
+
+@item
+Convert .360 to Equi-Angular Cubemap projection.
+@example
+-i INPUT -filter_complex '[0:0]hwupload[a], [0:5]hwupload[b], [a][b]gopromax_opencl=eac, hwdownload, format=yuvj420p, v360=eac:c3x2:w=1344:h=896' -map 0:1 -map 0:3 -c:a copy -c:u copy OUTPUT
+@end example
+
+Two video streams (#0:0 and #0:5) are combined and converted to equi-angular cubemap projection,
+then it is converted to c3x2 cubemap projection and shrunk by v360 filter.
+Stream #0:1 (GoPro AAC) and stream #0:3 (GoPro MET) are copied with the video stream.
+
+@end itemize
+
 @anchor{nlmeans_opencl}
 @section nlmeans_opencl
 
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 91487afb21..bbbb234c1b 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -327,6 +327,8 @@ OBJS-$(CONFIG_FSYNC_FILTER)                  += vf_fsync.o
 OBJS-$(CONFIG_GBLUR_FILTER)                  += vf_gblur.o
 OBJS-$(CONFIG_GBLUR_VULKAN_FILTER)           += vf_gblur_vulkan.o vulkan.o vulkan_filter.o
 OBJS-$(CONFIG_GEQ_FILTER)                    += vf_geq.o
+OBJS-$(CONFIG_GOPROMAX_OPENCL_FILTER)        += vf_gopromax_opencl.o opencl.o \
+                                                opencl/gopromax.o framesync.o
 OBJS-$(CONFIG_GRADFUN_FILTER)                += vf_gradfun.o
 OBJS-$(CONFIG_GRAPHMONITOR_FILTER)           += f_graphmonitor.o
 OBJS-$(CONFIG_GRAYWORLD_FILTER)              += vf_grayworld.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 9819f0f95b..dc89f104d2 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -303,6 +303,7 @@ extern const AVFilter ff_vf_fsync;
 extern const AVFilter ff_vf_gblur;
 extern const AVFilter ff_vf_gblur_vulkan;
 extern const AVFilter ff_vf_geq;
+extern const AVFilter ff_vf_gopromax_opencl;
 extern const AVFilter ff_vf_gradfun;
 extern const AVFilter ff_vf_graphmonitor;
 extern const AVFilter ff_vf_grayworld;
diff --git a/libavfilter/opencl/gopromax.cl b/libavfilter/opencl/gopromax.cl
new file mode 100644
index 0000000000..440469e2b8
--- /dev/null
+++ b/libavfilter/opencl/gopromax.cl
@@ -0,0 +1,282 @@
+/*
+ * Copyright (c) 2021 Ronan LE MEILLAT
+ * Copyright (c) 2024 TADANO Tokumei
+ *
+ * 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
+ */
+
+enum Faces {
+    TOP_LEFT,
+    TOP_MIDDLE,
+    TOP_RIGHT,
+    BOTTOM_LEFT,
+    BOTTOM_MIDDLE,
+    BOTTOM_RIGHT,
+    NB_FACES,
+};
+
+enum Direction {
+    RIGHT,
+    LEFT,
+    UP,
+    DOWN,
+    FRONT,
+    BACK,
+    NB_DIRECTIONS,
+};
+
+enum Rotation {
+    ROT_0,
+    ROT_90,
+    ROT_180,
+    ROT_270,
+    NB_ROTATIONS,
+};
+
+static float2 rotate_cube_face(float2 uv, int rotation)
+{
+    float2 ret_uv;
+
+    switch (rotation) {
+    case ROT_0:
+        ret_uv = uv;
+        break;
+    case ROT_90:
+        ret_uv.x = -uv.y;
+        ret_uv.y =  uv.x;
+        break;
+    case ROT_180:
+        ret_uv.x = -uv.x;
+        ret_uv.y = -uv.y;
+        break;
+    case ROT_270:
+        ret_uv.x =  uv.y;
+        ret_uv.y =  -uv.x;
+        break;
+    }
+
+    return ret_uv;
+}
+
+static float3 equirect_to_xyz(int2 xy, int2 size)
+{
+    float3 xyz;
+    float phi   = ((2.f * ((float)xy.x) + 1.f) / ((float)size.x) - 1.f) * M_PI_F ;
+    float theta = ((2.f * ((float)xy.y) + 1.f) / ((float)size.y) - 1.f) * M_PI_2_F;
+
+    xyz.x = cos(theta) * sin(phi);
+    xyz.y = sin(theta);
+    xyz.z = cos(theta) * cos(phi);
+
+    return xyz;
+}
+
+static float2 xyz_to_cube(float3 xyz, int *face)
+{
+    float phi   = atan2(xyz.x, xyz.z);
+    float theta = asin(xyz.y);
+    float phi_norm, theta_threshold;
+    float2 uv;
+    int direction; 
+
+    if (phi >= -M_PI_4_F && phi < M_PI_4_F) {
+        direction = FRONT;
+        phi_norm = phi;
+    } else if (phi >= -(M_PI_2_F + M_PI_4_F) && phi < -M_PI_4_F) {
+        direction = LEFT;
+        phi_norm = phi + M_PI_2_F;
+    } else if (phi >= M_PI_4_F && phi < M_PI_2_F + M_PI_4_F) {
+        direction = RIGHT;
+        phi_norm = phi - M_PI_2_F;
+    } else {
+        direction = BACK;
+        phi_norm = phi + ((phi > 0.f) ? -M_PI_F : M_PI_F);
+    }
+
+    theta_threshold = atan(cos(phi_norm));
+    if (theta > theta_threshold) {
+        direction = DOWN;
+    } else if (theta < -theta_threshold) {
+        direction = UP;
+    }
+
+    switch (direction) {
+    case RIGHT:
+        uv.x = -xyz.z / xyz.x;
+        uv.y =  xyz.y / xyz.x;
+        *face = TOP_RIGHT;
+        break;
+    case LEFT:
+        uv.x = -xyz.z / xyz.x;
+        uv.y = -xyz.y / xyz.x;
+        *face = TOP_LEFT;
+        break;
+    case UP:
+        uv.x = -xyz.x / xyz.y;
+        uv.y = -xyz.z / xyz.y;
+        *face = BOTTOM_RIGHT;
+        uv = rotate_cube_face(uv, ROT_270);
+        break;
+    case DOWN:
+        uv.x =  xyz.x / xyz.y;
+        uv.y = -xyz.z / xyz.y;
+        *face = BOTTOM_LEFT;
+        uv = rotate_cube_face(uv, ROT_270);
+        break;
+    case FRONT:
+        uv.x =  xyz.x / xyz.z;
+        uv.y =  xyz.y / xyz.z;
+        *face = TOP_MIDDLE;
+        break;
+    case BACK:
+        uv.x =  xyz.x / xyz.z;
+        uv.y = -xyz.y / xyz.z;
+        *face = BOTTOM_MIDDLE;
+        uv = rotate_cube_face(uv, ROT_90);
+        break;
+    }
+
+    return uv;
+}
+
+static float2 xyz_to_eac(float3 xyz, int2 size)
+{
+    float pixel_pad = 2;
+    float u_pad = pixel_pad / size.x;
+    float v_pad = pixel_pad / size.y;
+
+    int face;
+    int u_face, v_face;
+    float2 uv = xyz_to_cube(xyz, &face);
+
+    u_face = face % 3;
+    v_face = face / 3;
+    //eac expansion
+    uv = M_2_PI_F * atan(uv) + 0.5f;
+
+    uv.x = (uv.x + u_face) * (1.f - 2.f * u_pad) / 3.f + u_pad;
+    uv.y = uv.y * (0.5f - 2.f * v_pad) + v_pad + 0.5f * v_face;
+
+    uv.x *= size.x;
+    uv.y *= size.y;
+
+    uv -= 0.5f;
+
+    return uv;
+}
+
+const sampler_t sampler_nearest = (CLK_NORMALIZED_COORDS_FALSE |
+                                   CLK_ADDRESS_CLAMP_TO_EDGE   |
+                                   CLK_FILTER_NEAREST);
+
+const sampler_t sampler_linear  = (CLK_NORMALIZED_COORDS_FALSE |
+                                   CLK_ADDRESS_CLAMP_TO_EDGE   |
+                                   CLK_FILTER_LINEAR);
+
+static float4 gopromax_to_eac(float2 uv, int overlap, __read_only image2d_t src)
+{
+    int2 dim = get_image_dim(src);
+    int cube_size = dim.y;
+    int gap = (cube_size * 3 + overlap * 2 - dim.x) / 2;
+    float2 uv2 = uv;
+    float a = 0.f;
+    float4 val;
+    bool is_aligned;
+
+    if (uv.x < cube_size || uv.x > cube_size * 2) {
+        int dx = 0;
+        int cs = cube_size - gap;
+        float cx = fmod(uv.x, cube_size) * cs / cube_size;
+        if (uv.x >= cube_size * 2)
+            dx = cube_size * 2 + overlap - gap;
+        if (cx >= (cs + overlap) / 2)
+            dx += overlap;
+        uv2.x = cx + dx;
+        if (cx > (cs - overlap) / 2 && cx < (cs + overlap) / 2)
+            a = (cx - (cs - overlap) / 2) / overlap;
+    } else {
+        uv2.x += overlap - gap;
+    }
+
+    {
+        int2 d = convert_int2(ceil(uv2) - floor(uv2));
+        is_aligned = (d.x == 0 && d.y == 0);
+    }
+    if (is_aligned)
+        val = read_imagef(src, sampler_nearest, uv2);
+    else
+        val = read_imagef(src, sampler_linear, uv2);
+    if (a > 0.f) {
+        float4 val2;
+        uv2.x += overlap;
+        if (is_aligned)
+            val2 = read_imagef(src, sampler_nearest, uv2);
+        else
+            val2 = read_imagef(src, sampler_linear, uv2);
+        val = mix(val, val2, a);
+    }
+
+    return val;
+}
+
+__kernel void gopromax_equirectangular(__write_only image2d_t dst,
+                                       __read_only  image2d_t front,
+                                       __read_only  image2d_t rear,
+                                       int overlap)
+{
+    float4 val;
+    int2 loc = (int2)(get_global_id(0), get_global_id(1));
+
+    int2 dst_size = get_image_dim(dst);
+    int2 src_size = get_image_dim(front);
+    int2 eac_size = (int2)(src_size.y * 3, src_size.y * 2);
+
+    float3 xyz = equirect_to_xyz(loc, dst_size);
+    float2 uv = xyz_to_eac(xyz, eac_size);
+
+    if (uv.y >= src_size.y) {
+        uv.y -= src_size.y;
+        val = gopromax_to_eac(uv, overlap, rear);
+    } else {
+        val = gopromax_to_eac(uv, overlap, front);
+    }
+
+    write_imagef(dst, loc, val);
+}
+
+__kernel void gopromax_stack(__write_only image2d_t dst,
+                             __read_only  image2d_t front,
+                             __read_only  image2d_t rear,
+                             int overlap)
+{
+    float4 val;
+    int2 loc = (int2)(get_global_id(0), get_global_id(1));
+    int2 dst_size = get_image_dim(dst);
+    int2 src_size = get_image_dim(front);
+    float2 uv = convert_float2(loc);
+
+    uv *= (float)src_size.y * 2 / dst_size.y;
+
+    if (uv.y >= src_size.y) {
+        uv.y -= src_size.y;
+        val = gopromax_to_eac(uv, overlap, rear);
+    } else {
+        val = gopromax_to_eac(uv, overlap, front);
+    }
+
+    write_imagef(dst, loc, val);
+}
diff --git a/libavfilter/opencl_source.h b/libavfilter/opencl_source.h
index b6930fb686..92135c6a7d 100644
--- a/libavfilter/opencl_source.h
+++ b/libavfilter/opencl_source.h
@@ -24,6 +24,7 @@ extern const char *ff_source_colorkey_cl;
 extern const char *ff_source_colorspace_common_cl;
 extern const char *ff_source_convolution_cl;
 extern const char *ff_source_deshake_cl;
+extern const char *ff_source_gopromax_cl;
 extern const char *ff_source_neighbor_cl;
 extern const char *ff_source_nlmeans_cl;
 extern const char *ff_source_overlay_cl;
diff --git a/libavfilter/vf_gopromax_opencl.c b/libavfilter/vf_gopromax_opencl.c
new file mode 100644
index 0000000000..3edfbf937b
--- /dev/null
+++ b/libavfilter/vf_gopromax_opencl.c
@@ -0,0 +1,350 @@
+/*
+ * Copyright (c) 2021 Ronan LE MEILLAT
+ * Copyright (c) 2024 TADANO Tokumei
+ *
+ * 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 "libavutil/log.h"
+#include "libavutil/mem.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/opt.h"
+
+#include "avfilter.h"
+#include "framesync.h"
+#include "opencl.h"
+#include "opencl_source.h"
+#include "video.h"
+#include "v360.h"
+
+typedef struct GoProMaxOpenCLContext {
+    OpenCLFilterContext ocf;
+
+    int              initialised;
+    cl_kernel        kernel;
+    cl_command_queue command_queue;
+
+    FFFrameSync      fs;
+
+    int              nb_planes;
+
+    int              out;
+    int              width, height;
+    int              overlap;
+} GoProMaxOpenCLContext;
+
+static int gopromax_opencl_load(AVFilterContext *avctx,
+                                enum AVPixelFormat front_format,
+                                enum AVPixelFormat rear_format)
+{
+    GoProMaxOpenCLContext *ctx = avctx->priv;
+    cl_int cle;
+    const char *source = ff_source_gopromax_cl;
+    const char *kernel;
+    const AVPixFmtDescriptor *front_desc, *rear_desc;
+    int err, i, front_planes, rear_planes;
+
+    front_desc = av_pix_fmt_desc_get(front_format);
+    rear_desc  = av_pix_fmt_desc_get(rear_format);
+    front_planes = rear_planes = 0;
+    for (i = 0; i < front_desc->nb_components; i++)
+        front_planes = FFMAX(front_planes,
+                             front_desc->comp[i].plane + 1);
+    for (i = 0; i < rear_desc->nb_components; i++)
+        rear_planes = FFMAX(rear_planes,
+                            rear_desc->comp[i].plane + 1);
+
+    ctx->nb_planes = front_planes;
+
+    switch (ctx->out) {
+    case EQUIRECTANGULAR:
+        kernel = "gopromax_equirectangular";
+        break;
+    case EQUIANGULAR:
+        kernel = "gopromax_stack";
+        break;
+    default:
+        av_log(ctx, AV_LOG_ERROR, "Specified output format is not handled.\n");
+        return AVERROR_BUG;
+    }
+
+    av_log(avctx, AV_LOG_DEBUG, "Using kernel %s.\n", kernel);
+
+    err = ff_opencl_filter_load_program(avctx, &source, 1);
+    if (err < 0)
+        goto fail;
+
+    ctx->command_queue = clCreateCommandQueue(ctx->ocf.hwctx->context,
+                                              ctx->ocf.hwctx->device_id,
+                                              0, &cle);
+    CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create OpenCL "
+                     "command queue %d.\n", cle);
+
+    ctx->kernel = clCreateKernel(ctx->ocf.program, kernel, &cle);
+    CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create kernel %d.\n", cle);
+
+    ctx->initialised = 1;
+    return 0;
+
+fail:
+    if (ctx->command_queue)
+        clReleaseCommandQueue(ctx->command_queue);
+    if (ctx->kernel)
+        clReleaseKernel(ctx->kernel);
+    return err;
+}
+
+static int gopromax_opencl_stack(FFFrameSync *fs)
+{
+    AVFilterContext     *avctx = fs->parent;
+    AVFilterLink      *outlink = avctx->outputs[0];
+    GoProMaxOpenCLContext *ctx = avctx->priv;
+    AVFrame *input_front, *input_rear;
+    AVFrame *output;
+    cl_mem mem;
+    cl_int cle, overlap;
+    size_t global_work[2];
+    int kernel_arg = 0;
+    int err, plane;
+
+    err = ff_framesync_get_frame(fs, 0, &input_front, 0);
+    if (err < 0)
+        return err;
+    err = ff_framesync_get_frame(fs, 1, &input_rear, 0);
+    if (err < 0)
+        return err;
+
+    if (!ctx->initialised) {
+        AVHWFramesContext *front_fc =
+            (AVHWFramesContext*)input_front->hw_frames_ctx->data;
+        AVHWFramesContext *rear_fc =
+            (AVHWFramesContext*)input_rear->hw_frames_ctx->data;
+
+        err = gopromax_opencl_load(avctx, front_fc->sw_format,
+                                   rear_fc->sw_format);
+        if (err < 0)
+            return err;
+    }
+
+    output = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+    if (!output) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    for (plane = 0; plane < ctx->nb_planes; plane++) {
+        kernel_arg = 0;
+
+        mem = (cl_mem)output->data[plane];
+        CL_SET_KERNEL_ARG(ctx->kernel, kernel_arg, cl_mem, &mem);
+        kernel_arg++;
+
+        mem = (cl_mem)input_front->data[plane];
+        CL_SET_KERNEL_ARG(ctx->kernel, kernel_arg, cl_mem, &mem);
+        kernel_arg++;
+
+        mem = (cl_mem)input_rear->data[plane];
+        CL_SET_KERNEL_ARG(ctx->kernel, kernel_arg, cl_mem, &mem);
+        kernel_arg++;
+
+        overlap = ctx->overlap;
+        CL_SET_KERNEL_ARG(ctx->kernel, kernel_arg, cl_int, &overlap);
+        kernel_arg++;
+
+        err = ff_opencl_filter_work_size_from_image(avctx, global_work,
+                                                    output, plane, 0);
+        if (err < 0)
+            goto fail;
+
+        av_log(avctx, AV_LOG_VERBOSE,
+               "In gopromax_opencl_stack for plane:%d %lux%lu frame size %dx%d\n",
+               plane, global_work[0], global_work[1], outlink->w, outlink->h);
+
+        cle = clEnqueueNDRangeKernel(ctx->command_queue, ctx->kernel, 2, NULL,
+                                     global_work, NULL, 0, NULL, NULL);
+        CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to enqueue gopromax kernel "
+                         "for plane %d: %d.\n", plane, cle);
+    }
+
+    cle = clFinish(ctx->command_queue);
+    CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to finish command queue: %d.\n", cle);
+
+    err = av_frame_copy_props(output, input_front);
+
+    av_log(avctx, AV_LOG_DEBUG, "Filter output: %s, %ux%u (%"PRId64").\n",
+           av_get_pix_fmt_name(output->format),
+           output->width, output->height, output->pts);
+
+    return ff_filter_frame(outlink, output);
+
+fail:
+    av_frame_free(&output);
+    return err;
+}
+
+static int gopromax_opencl_config_output(AVFilterLink *outlink)
+{
+    AVFilterContext *avctx = outlink->src;
+    GoProMaxOpenCLContext *ctx = avctx->priv;
+    int height = avctx->inputs[0]->h;
+    int err;
+
+    switch (ctx->out) {
+    case EQUIRECTANGULAR:
+        if (ctx->width > 0 && ctx->height > 0) {
+            if (ctx->width != ctx->height * 2) {
+                av_log(ctx, AV_LOG_ERROR,
+                       "Specified size (%dx%d) is not suitable.\n",
+                       ctx->width, ctx->height);
+                return AVERROR(EINVAL);
+            }
+            ctx->ocf.output_width = ctx->width;
+            ctx->ocf.output_height = ctx->height;
+        } else if (ctx->width > 0 || ctx->height > 0) {
+            av_log(ctx, AV_LOG_ERROR,
+                   "Both width and height values should be specified.\n");
+            return AVERROR(EINVAL);
+        } else {
+            ctx->ocf.output_width = 4 * height;
+            ctx->ocf.output_height = 2 * height;
+        }
+        break;
+    case EQUIANGULAR:
+        if (ctx->width > 0 && ctx->height > 0) {
+            if (ctx->width * 2 != ctx->height * 3) {
+                av_log(ctx, AV_LOG_ERROR,
+                       "Specified size (%dx%d) is not suitable.\n",
+                       ctx->width, ctx->height);
+                return AVERROR(EINVAL);
+            }
+            ctx->ocf.output_width = ctx->width;
+            ctx->ocf.output_height = ctx->height;
+        } else if (ctx->width > 0 || ctx->height > 0) {
+            av_log(ctx, AV_LOG_ERROR,
+                   "Both width and height values should be specified.\n");
+            return AVERROR(EINVAL);
+        } else {
+            ctx->ocf.output_width = 3 * height;
+            ctx->ocf.output_height = 2 * height;
+        }
+        break;
+    default:
+        av_log(ctx, AV_LOG_ERROR, "Specified output format is not supported.\n");
+        return AVERROR(EINVAL);
+    }
+
+    err = ff_opencl_filter_config_output(outlink);
+    if (err < 0)
+        return err;
+
+    err = ff_framesync_init_dualinput(&ctx->fs, avctx);
+    if (err < 0)
+        return err;
+
+    return ff_framesync_configure(&ctx->fs);
+}
+
+static av_cold int gopromax_opencl_init(AVFilterContext *avctx)
+{
+    GoProMaxOpenCLContext *ctx = avctx->priv;
+
+    ctx->fs.on_event = &gopromax_opencl_stack;
+
+    return ff_opencl_filter_init(avctx);
+}
+
+static int gopromax_opencl_activate(AVFilterContext *avctx)
+{
+    GoProMaxOpenCLContext *ctx = avctx->priv;
+
+    return ff_framesync_activate(&ctx->fs);
+}
+
+static av_cold void gopromax_opencl_uninit(AVFilterContext *avctx)
+{
+    GoProMaxOpenCLContext *ctx = avctx->priv;
+    cl_int cle;
+
+    if (ctx->kernel) {
+        cle = clReleaseKernel(ctx->kernel);
+        if (cle != CL_SUCCESS)
+            av_log(avctx, AV_LOG_ERROR, "Failed to release "
+                   "kernel: %d.\n", cle);
+    }
+
+    if (ctx->command_queue) {
+        cle = clReleaseCommandQueue(ctx->command_queue);
+        if (cle != CL_SUCCESS)
+            av_log(avctx, AV_LOG_ERROR, "Failed to release "
+                   "command queue: %d.\n", cle);
+    }
+
+    ff_opencl_filter_uninit(avctx);
+
+    ff_framesync_uninit(&ctx->fs);
+}
+
+#define OFFSET(x) offsetof(GoProMaxOpenCLContext, x)
+#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
+static const AVOption gopromax_opencl_options[] = {
+    {   "output", "set output projection",  OFFSET(out), AV_OPT_TYPE_INT,   {.i64=EQUIRECTANGULAR}, 0, NB_PROJECTIONS-1, FLAGS, .unit = "out" },
+    {        "e", "equirectangular",                  0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0,                0, FLAGS, .unit = "out" },
+    { "equirect", "equirectangular",                  0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0,                0, FLAGS, .unit = "out" },
+    {      "eac", "equi-angular cubemap",             0, AV_OPT_TYPE_CONST, {.i64=EQUIANGULAR},     0,                0, FLAGS, .unit = "out" },
+    {        "w", "output width",         OFFSET(width), AV_OPT_TYPE_INT,   {.i64=0},               0,        INT16_MAX, FLAGS, .unit = "w"},
+    {        "h", "output height",       OFFSET(height), AV_OPT_TYPE_INT,   {.i64=0},               0,        INT16_MAX, FLAGS, .unit = "h"},
+    {  "overlap", "set overlapped pixels", OFFSET(overlap), AV_OPT_TYPE_INT, {.i64=64},             0,              128, FLAGS, .unit = "overlap"},
+    { NULL },
+};
+
+AVFILTER_DEFINE_CLASS(gopromax_opencl);
+
+static const AVFilterPad gopromax_opencl_inputs[] = {
+    {
+        .name         = "front",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .config_props = &ff_opencl_filter_config_input,
+    },
+    {
+        .name         = "rear",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .config_props = &ff_opencl_filter_config_input,
+    },
+};
+
+static const AVFilterPad gopromax_opencl_outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_VIDEO,
+        .config_props  = &gopromax_opencl_config_output,
+    },
+};
+
+const AVFilter ff_vf_gopromax_opencl = {
+    .name            = "gopromax_opencl",
+    .description     = NULL_IF_CONFIG_SMALL("GoProMax .360 to equirectangular projection"),
+    .priv_size       = sizeof(GoProMaxOpenCLContext),
+    .priv_class      = &gopromax_opencl_class,
+    .init            = &gopromax_opencl_init,
+    .uninit          = &gopromax_opencl_uninit,
+    .activate        = &gopromax_opencl_activate,
+    FILTER_INPUTS(gopromax_opencl_inputs),
+    FILTER_OUTPUTS(gopromax_opencl_outputs),
+    FILTER_SINGLE_PIXFMT(AV_PIX_FMT_OPENCL),
+    .flags_internal  = FF_FILTER_FLAG_HWFRAME_AWARE,
+    .flags           = AVFILTER_FLAG_HWDEVICE,
+};
