diff --git a/libavcodec/hw_base_encode.c b/libavcodec/hw_base_encode.c
index 25fcfdbb5e..31046bd73e 100644
--- a/libavcodec/hw_base_encode.c
+++ b/libavcodec/hw_base_encode.c
@@ -687,6 +687,64 @@ int ff_hw_base_init_gop_structure(AVCodecContext *avctx, uint32_t ref_l0, uint32
     return 0;
 }
 
+int ff_hw_base_get_recon_format(AVCodecContext *avctx, const void *hwconfig, enum AVPixelFormat *fmt)
+{
+    FFHWBaseEncodeContext *ctx = avctx->priv_data;
+    AVHWFramesConstraints *constraints = NULL;
+    enum AVPixelFormat recon_format;
+    int err, i;
+
+    constraints = av_hwdevice_get_hwframe_constraints(ctx->device_ref,
+                                                      hwconfig);
+    if (!constraints) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    // Probably we can use the input surface format as the surface format
+    // of the reconstructed frames.  If not, we just pick the first (only?)
+    // format in the valid list and hope that it all works.
+    recon_format = AV_PIX_FMT_NONE;
+    if (constraints->valid_sw_formats) {
+        for (i = 0; constraints->valid_sw_formats[i] != AV_PIX_FMT_NONE; i++) {
+            if (ctx->input_frames->sw_format ==
+                constraints->valid_sw_formats[i]) {
+                recon_format = ctx->input_frames->sw_format;
+                break;
+            }
+        }
+        if (recon_format == AV_PIX_FMT_NONE) {
+            // No match.  Just use the first in the supported list and
+            // hope for the best.
+            recon_format = constraints->valid_sw_formats[0];
+        }
+    } else {
+        // No idea what to use; copy input format.
+        recon_format = ctx->input_frames->sw_format;
+    }
+    av_log(avctx, AV_LOG_DEBUG, "Using %s as format of "
+           "reconstructed frames.\n", av_get_pix_fmt_name(recon_format));
+
+    if (ctx->surface_width  < constraints->min_width  ||
+        ctx->surface_height < constraints->min_height ||
+        ctx->surface_width  > constraints->max_width ||
+        ctx->surface_height > constraints->max_height) {
+        av_log(avctx, AV_LOG_ERROR, "Hardware does not support encoding at "
+               "size %dx%d (constraints: width %d-%d height %d-%d).\n",
+               ctx->surface_width, ctx->surface_height,
+               constraints->min_width,  constraints->max_width,
+               constraints->min_height, constraints->max_height);
+        err = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    *fmt = recon_format;
+    err = 0;
+fail:
+    av_hwframe_constraints_free(&constraints);
+    return err;
+}
+
 int ff_hw_base_encode_init(AVCodecContext *avctx)
 {
     FFHWBaseEncodeContext *ctx = avctx->priv_data;
diff --git a/libavcodec/hw_base_encode.h b/libavcodec/hw_base_encode.h
index f097d826a7..f5414e2c28 100644
--- a/libavcodec/hw_base_encode.h
+++ b/libavcodec/hw_base_encode.h
@@ -128,6 +128,16 @@ typedef struct FFHWBaseEncodeContext {
     // Desired B frame reference depth.
     int             desired_b_depth;
 
+    // The required size of surfaces.  This is probably the input
+    // size (AVCodecContext.width|height) aligned up to whatever
+    // block size is required by the codec.
+    int             surface_width;
+    int             surface_height;
+
+    // The block size for slice calculations.
+    int             slice_block_width;
+    int             slice_block_height;
+
     // The hardware device context.
     AVBufferRef    *device_ref;
     AVHWDeviceContext *device;
@@ -212,6 +222,8 @@ int ff_hw_base_encode_receive_packet(AVCodecContext *avctx, AVPacket *pkt);
 int ff_hw_base_init_gop_structure(AVCodecContext *avctx, uint32_t ref_l0, uint32_t ref_l1,
                                   int flags, int prediction_pre_only);
 
+int ff_hw_base_get_recon_format(AVCodecContext *avctx, const void *hwconfig, enum AVPixelFormat *fmt);
+
 int ff_hw_base_encode_init(AVCodecContext *avctx);
 
 int ff_hw_base_encode_close(AVCodecContext *avctx);
diff --git a/libavcodec/vaapi_encode.c b/libavcodec/vaapi_encode.c
index 4193f3838f..d96f146b28 100644
--- a/libavcodec/vaapi_encode.c
+++ b/libavcodec/vaapi_encode.c
@@ -1777,6 +1777,7 @@ static av_cold int vaapi_encode_init_tile_slice_structure(AVCodecContext *avctx,
 
 static av_cold int vaapi_encode_init_slice_structure(AVCodecContext *avctx)
 {
+    FFHWBaseEncodeContext *base_ctx = avctx->priv_data;
     VAAPIEncodeContext *ctx = avctx->priv_data;
     VAConfigAttrib attr[3] = { { VAConfigAttribEncMaxSlices },
                                { VAConfigAttribEncSliceStructure },
@@ -1796,12 +1797,12 @@ static av_cold int vaapi_encode_init_slice_structure(AVCodecContext *avctx)
         return 0;
     }
 
-    av_assert0(ctx->slice_block_height > 0 && ctx->slice_block_width > 0);
+    av_assert0(base_ctx->slice_block_height > 0 && base_ctx->slice_block_width > 0);
 
-    ctx->slice_block_rows = (avctx->height + ctx->slice_block_height - 1) /
-                             ctx->slice_block_height;
-    ctx->slice_block_cols = (avctx->width  + ctx->slice_block_width  - 1) /
-                             ctx->slice_block_width;
+    ctx->slice_block_rows = (avctx->height + base_ctx->slice_block_height - 1) /
+                             base_ctx->slice_block_height;
+    ctx->slice_block_cols = (avctx->width  + base_ctx->slice_block_width  - 1) /
+                             base_ctx->slice_block_width;
 
     if (avctx->slices <= 1 && !ctx->tile_rows && !ctx->tile_cols) {
         ctx->nb_slices  = 1;
@@ -2023,7 +2024,8 @@ static void vaapi_encode_free_output_buffer(FFRefStructOpaque opaque,
 static int vaapi_encode_alloc_output_buffer(FFRefStructOpaque opaque, void *obj)
 {
     AVCodecContext   *avctx = opaque.nc;
-    VAAPIEncodeContext *ctx = avctx->priv_data;
+    FFHWBaseEncodeContext *base_ctx = avctx->priv_data;
+    VAAPIEncodeContext         *ctx = avctx->priv_data;
     VABufferID *buffer_id = obj;
     VAStatus vas;
 
@@ -2033,7 +2035,7 @@ static int vaapi_encode_alloc_output_buffer(FFRefStructOpaque opaque, void *obj)
     // bound on that.
     vas = vaCreateBuffer(ctx->hwctx->display, ctx->va_context,
                          VAEncCodedBufferType,
-                         3 * ctx->surface_width * ctx->surface_height +
+                         3 * base_ctx->surface_width * base_ctx->surface_height +
                          (1 << 16), 1, 0, buffer_id);
     if (vas != VA_STATUS_SUCCESS) {
         av_log(avctx, AV_LOG_ERROR, "Failed to create bitstream "
@@ -2051,9 +2053,8 @@ static av_cold int vaapi_encode_create_recon_frames(AVCodecContext *avctx)
     FFHWBaseEncodeContext *base_ctx = avctx->priv_data;
     VAAPIEncodeContext         *ctx = avctx->priv_data;
     AVVAAPIHWConfig *hwconfig = NULL;
-    AVHWFramesConstraints *constraints = NULL;
     enum AVPixelFormat recon_format;
-    int err, i;
+    int err;
 
     hwconfig = av_hwdevice_hwconfig_alloc(base_ctx->device_ref);
     if (!hwconfig) {
@@ -2062,52 +2063,9 @@ static av_cold int vaapi_encode_create_recon_frames(AVCodecContext *avctx)
     }
     hwconfig->config_id = ctx->va_config;
 
-    constraints = av_hwdevice_get_hwframe_constraints(base_ctx->device_ref,
-                                                      hwconfig);
-    if (!constraints) {
-        err = AVERROR(ENOMEM);
-        goto fail;
-    }
-
-    // Probably we can use the input surface format as the surface format
-    // of the reconstructed frames.  If not, we just pick the first (only?)
-    // format in the valid list and hope that it all works.
-    recon_format = AV_PIX_FMT_NONE;
-    if (constraints->valid_sw_formats) {
-        for (i = 0; constraints->valid_sw_formats[i] != AV_PIX_FMT_NONE; i++) {
-            if (base_ctx->input_frames->sw_format ==
-                constraints->valid_sw_formats[i]) {
-                recon_format = base_ctx->input_frames->sw_format;
-                break;
-            }
-        }
-        if (recon_format == AV_PIX_FMT_NONE) {
-            // No match.  Just use the first in the supported list and
-            // hope for the best.
-            recon_format = constraints->valid_sw_formats[0];
-        }
-    } else {
-        // No idea what to use; copy input format.
-        recon_format = base_ctx->input_frames->sw_format;
-    }
-    av_log(avctx, AV_LOG_DEBUG, "Using %s as format of "
-           "reconstructed frames.\n", av_get_pix_fmt_name(recon_format));
-
-    if (ctx->surface_width  < constraints->min_width  ||
-        ctx->surface_height < constraints->min_height ||
-        ctx->surface_width  > constraints->max_width ||
-        ctx->surface_height > constraints->max_height) {
-        av_log(avctx, AV_LOG_ERROR, "Hardware does not support encoding at "
-               "size %dx%d (constraints: width %d-%d height %d-%d).\n",
-               ctx->surface_width, ctx->surface_height,
-               constraints->min_width,  constraints->max_width,
-               constraints->min_height, constraints->max_height);
-        err = AVERROR(EINVAL);
+    err = ff_hw_base_get_recon_format(avctx, (const void*)hwconfig, &recon_format);
+    if (err < 0)
         goto fail;
-    }
-
-    av_freep(&hwconfig);
-    av_hwframe_constraints_free(&constraints);
 
     base_ctx->recon_frames_ref = av_hwframe_ctx_alloc(base_ctx->device_ref);
     if (!base_ctx->recon_frames_ref) {
@@ -2118,8 +2076,8 @@ static av_cold int vaapi_encode_create_recon_frames(AVCodecContext *avctx)
 
     base_ctx->recon_frames->format    = AV_PIX_FMT_VAAPI;
     base_ctx->recon_frames->sw_format = recon_format;
-    base_ctx->recon_frames->width     = ctx->surface_width;
-    base_ctx->recon_frames->height    = ctx->surface_height;
+    base_ctx->recon_frames->width     = base_ctx->surface_width;
+    base_ctx->recon_frames->height    = base_ctx->surface_height;
 
     err = av_hwframe_ctx_init(base_ctx->recon_frames_ref);
     if (err < 0) {
@@ -2131,7 +2089,6 @@ static av_cold int vaapi_encode_create_recon_frames(AVCodecContext *avctx)
     err = 0;
   fail:
     av_freep(&hwconfig);
-    av_hwframe_constraints_free(&constraints);
     return err;
 }
 
@@ -2174,11 +2131,11 @@ av_cold int ff_vaapi_encode_init(AVCodecContext *avctx)
             goto fail;
     } else {
         // Assume 16x16 blocks.
-        ctx->surface_width  = FFALIGN(avctx->width,  16);
-        ctx->surface_height = FFALIGN(avctx->height, 16);
+        base_ctx->surface_width  = FFALIGN(avctx->width,  16);
+        base_ctx->surface_height = FFALIGN(avctx->height, 16);
         if (ctx->codec->flags & FF_HW_FLAG_SLICE_CONTROL) {
-            ctx->slice_block_width  = 16;
-            ctx->slice_block_height = 16;
+            base_ctx->slice_block_width  = 16;
+            base_ctx->slice_block_height = 16;
         }
     }
 
@@ -2231,7 +2188,7 @@ av_cold int ff_vaapi_encode_init(AVCodecContext *avctx)
 
     recon_hwctx = base_ctx->recon_frames->hwctx;
     vas = vaCreateContext(ctx->hwctx->display, ctx->va_config,
-                          ctx->surface_width, ctx->surface_height,
+                          base_ctx->surface_width, base_ctx->surface_height,
                           VA_PROGRESSIVE,
                           recon_hwctx->surface_ids,
                           recon_hwctx->nb_surfaces,
diff --git a/libavcodec/vaapi_encode.h b/libavcodec/vaapi_encode.h
index 088141ca76..8650255680 100644
--- a/libavcodec/vaapi_encode.h
+++ b/libavcodec/vaapi_encode.h
@@ -171,16 +171,6 @@ typedef struct VAAPIEncodeContext {
     // Desired packed headers.
     unsigned int    desired_packed_headers;
 
-    // The required size of surfaces.  This is probably the input
-    // size (AVCodecContext.width|height) aligned up to whatever
-    // block size is required by the codec.
-    int             surface_width;
-    int             surface_height;
-
-    // The block size for slice calculations.
-    int             slice_block_width;
-    int             slice_block_height;
-
     // Everything above this point must be set before calling
     // ff_vaapi_encode_init().
 
diff --git a/libavcodec/vaapi_encode_av1.c b/libavcodec/vaapi_encode_av1.c
index a590f4cd8b..ea4c391e54 100644
--- a/libavcodec/vaapi_encode_av1.c
+++ b/libavcodec/vaapi_encode_av1.c
@@ -112,12 +112,12 @@ static void vaapi_encode_av1_trace_write_log(void *ctx,
 
 static av_cold int vaapi_encode_av1_get_encoder_caps(AVCodecContext *avctx)
 {
-    VAAPIEncodeContext *ctx = avctx->priv_data;
-    VAAPIEncodeAV1Context *priv = avctx->priv_data;
+    FFHWBaseEncodeContext *base_ctx = avctx->priv_data;
+    VAAPIEncodeAV1Context     *priv = avctx->priv_data;
 
     // Surfaces must be aligned to superblock boundaries.
-    ctx->surface_width  = FFALIGN(avctx->width,  priv->use_128x128_superblock ? 128 : 64);
-    ctx->surface_height = FFALIGN(avctx->height, priv->use_128x128_superblock ? 128 : 64);
+    base_ctx->surface_width  = FFALIGN(avctx->width,  priv->use_128x128_superblock ? 128 : 64);
+    base_ctx->surface_height = FFALIGN(avctx->height, priv->use_128x128_superblock ? 128 : 64);
 
     return 0;
 }
@@ -425,7 +425,7 @@ static int vaapi_encode_av1_init_sequence_params(AVCodecContext *avctx)
             framerate = 0;
 
         level = ff_av1_guess_level(avctx->bit_rate, priv->tier,
-                                   ctx->surface_width, ctx->surface_height,
+                                   base_ctx->surface_width, base_ctx->surface_height,
                                    priv->tile_rows * priv->tile_cols,
                                    priv->tile_cols, framerate);
         if (level) {
diff --git a/libavcodec/vaapi_encode_h264.c b/libavcodec/vaapi_encode_h264.c
index eacfb12706..d20d8298db 100644
--- a/libavcodec/vaapi_encode_h264.c
+++ b/libavcodec/vaapi_encode_h264.c
@@ -1205,8 +1205,9 @@ static const VAAPIEncodeType vaapi_encode_type_h264 = {
 
 static av_cold int vaapi_encode_h264_init(AVCodecContext *avctx)
 {
-    VAAPIEncodeContext      *ctx = avctx->priv_data;
-    VAAPIEncodeH264Context *priv = avctx->priv_data;
+    FFHWBaseEncodeContext *base_ctx = avctx->priv_data;
+    VAAPIEncodeContext         *ctx = avctx->priv_data;
+    VAAPIEncodeH264Context    *priv = avctx->priv_data;
 
     ctx->codec = &vaapi_encode_type_h264;
 
@@ -1254,10 +1255,10 @@ static av_cold int vaapi_encode_h264_init(AVCodecContext *avctx)
         VA_ENC_PACKED_HEADER_SLICE    | // Slice headers.
         VA_ENC_PACKED_HEADER_MISC;      // SEI.
 
-    ctx->surface_width  = FFALIGN(avctx->width,  16);
-    ctx->surface_height = FFALIGN(avctx->height, 16);
+    base_ctx->surface_width  = FFALIGN(avctx->width,  16);
+    base_ctx->surface_height = FFALIGN(avctx->height, 16);
 
-    ctx->slice_block_height = ctx->slice_block_width = 16;
+    base_ctx->slice_block_height = base_ctx->slice_block_width = 16;
 
     if (priv->qp > 0)
         ctx->explicit_qp = priv->qp;
diff --git a/libavcodec/vaapi_encode_h265.c b/libavcodec/vaapi_encode_h265.c
index 509251c97a..e1748e4419 100644
--- a/libavcodec/vaapi_encode_h265.c
+++ b/libavcodec/vaapi_encode_h265.c
@@ -352,7 +352,7 @@ static int vaapi_encode_h265_init_sequence_params(AVCodecContext *avctx)
         const H265LevelDescriptor *level;
 
         level = ff_h265_guess_level(ptl, avctx->bit_rate,
-                                    ctx->surface_width, ctx->surface_height,
+                                    base_ctx->surface_width, base_ctx->surface_height,
                                     ctx->nb_slices, ctx->tile_rows, ctx->tile_cols,
                                     (base_ctx->b_per_p > 0) + 1);
         if (level) {
@@ -410,18 +410,18 @@ static int vaapi_encode_h265_init_sequence_params(AVCodecContext *avctx)
     sps->chroma_format_idc          = chroma_format;
     sps->separate_colour_plane_flag = 0;
 
-    sps->pic_width_in_luma_samples  = ctx->surface_width;
-    sps->pic_height_in_luma_samples = ctx->surface_height;
+    sps->pic_width_in_luma_samples  = base_ctx->surface_width;
+    sps->pic_height_in_luma_samples = base_ctx->surface_height;
 
-    if (avctx->width  != ctx->surface_width ||
-        avctx->height != ctx->surface_height) {
+    if (avctx->width  != base_ctx->surface_width ||
+        avctx->height != base_ctx->surface_height) {
         sps->conformance_window_flag = 1;
         sps->conf_win_left_offset   = 0;
         sps->conf_win_right_offset  =
-            (ctx->surface_width - avctx->width) >> desc->log2_chroma_w;
+            (base_ctx->surface_width - avctx->width) >> desc->log2_chroma_w;
         sps->conf_win_top_offset    = 0;
         sps->conf_win_bottom_offset =
-            (ctx->surface_height - avctx->height) >> desc->log2_chroma_h;
+            (base_ctx->surface_height - avctx->height) >> desc->log2_chroma_h;
     } else {
         sps->conformance_window_flag = 0;
     }
@@ -1197,11 +1197,12 @@ static int vaapi_encode_h265_init_slice_params(AVCodecContext *avctx,
 
 static av_cold int vaapi_encode_h265_get_encoder_caps(AVCodecContext *avctx)
 {
-    VAAPIEncodeContext      *ctx = avctx->priv_data;
-    VAAPIEncodeH265Context *priv = avctx->priv_data;
+    FFHWBaseEncodeContext *base_ctx = avctx->priv_data;
+    VAAPIEncodeH265Context    *priv = avctx->priv_data;
 
 #if VA_CHECK_VERSION(1, 13, 0)
     {
+        VAAPIEncodeContext *ctx = avctx->priv_data;
         VAConfigAttribValEncHEVCBlockSizes block_size;
         VAConfigAttrib attr;
         VAStatus vas;
@@ -1249,10 +1250,10 @@ static av_cold int vaapi_encode_h265_get_encoder_caps(AVCodecContext *avctx)
            "min CB size %dx%d.\n", priv->ctu_size, priv->ctu_size,
            priv->min_cb_size, priv->min_cb_size);
 
-    ctx->surface_width  = FFALIGN(avctx->width,  priv->min_cb_size);
-    ctx->surface_height = FFALIGN(avctx->height, priv->min_cb_size);
+    base_ctx->surface_width  = FFALIGN(avctx->width,  priv->min_cb_size);
+    base_ctx->surface_height = FFALIGN(avctx->height, priv->min_cb_size);
 
-    ctx->slice_block_width = ctx->slice_block_height = priv->ctu_size;
+    base_ctx->slice_block_width = base_ctx->slice_block_height = priv->ctu_size;
 
     return 0;
 }
diff --git a/libavcodec/vaapi_encode_mjpeg.c b/libavcodec/vaapi_encode_mjpeg.c
index 48dc677bec..5d51a0b2b9 100644
--- a/libavcodec/vaapi_encode_mjpeg.c
+++ b/libavcodec/vaapi_encode_mjpeg.c
@@ -439,14 +439,13 @@ static int vaapi_encode_mjpeg_init_slice_params(AVCodecContext *avctx,
 static av_cold int vaapi_encode_mjpeg_get_encoder_caps(AVCodecContext *avctx)
 {
     FFHWBaseEncodeContext *base_ctx = avctx->priv_data;
-    VAAPIEncodeContext *ctx = avctx->priv_data;
     const AVPixFmtDescriptor *desc;
 
     desc = av_pix_fmt_desc_get(base_ctx->input_frames->sw_format);
     av_assert0(desc);
 
-    ctx->surface_width  = FFALIGN(avctx->width,  8 << desc->log2_chroma_w);
-    ctx->surface_height = FFALIGN(avctx->height, 8 << desc->log2_chroma_h);
+    base_ctx->surface_width  = FFALIGN(avctx->width,  8 << desc->log2_chroma_w);
+    base_ctx->surface_height = FFALIGN(avctx->height, 8 << desc->log2_chroma_h);
 
     return 0;
 }
diff --git a/libavcodec/vaapi_encode_vp9.c b/libavcodec/vaapi_encode_vp9.c
index a737a0cdd7..96acd414af 100644
--- a/libavcodec/vaapi_encode_vp9.c
+++ b/libavcodec/vaapi_encode_vp9.c
@@ -190,11 +190,11 @@ static int vaapi_encode_vp9_init_picture_params(AVCodecContext *avctx,
 
 static av_cold int vaapi_encode_vp9_get_encoder_caps(AVCodecContext *avctx)
 {
-    VAAPIEncodeContext *ctx = avctx->priv_data;
+    FFHWBaseEncodeContext *base_ctx = avctx->priv_data;
 
     // Surfaces must be aligned to 64x64 superblock boundaries.
-    ctx->surface_width  = FFALIGN(avctx->width,  64);
-    ctx->surface_height = FFALIGN(avctx->height, 64);
+    base_ctx->surface_width  = FFALIGN(avctx->width,  64);
+    base_ctx->surface_height = FFALIGN(avctx->height, 64);
 
     return 0;
 }
