[FFmpeg-devel] [PATCH] avfilter: add QSV variants of the stack filters
Linjie Fu
linjie.justin.fu at gmail.com
Sun Jul 18 06:57:39 EEST 2021
Hi Haihao,
On Wed, Jun 9, 2021 at 3:36 PM Haihao Xiang <haihao.xiang at intel.com> wrote:
>
> Include hstack_qsv, vstack_qsv and xstack_qsv, some code is copy and
> pasted from other filters
>
> Example:
> $> ffmpeg -hwaccel qsv -c:v hevc_qsv -i input.h265 -filter_complex
> "[0:v][0:v]hstack_qsv" -f null -
> ---
> configure | 6 +
> libavfilter/Makefile | 3 +
> libavfilter/allfilters.c | 3 +
> libavfilter/vf_stack_qsv.c | 499 +++++++++++++++++++++++++++++++++++++
> 4 files changed, 511 insertions(+)
> create mode 100644 libavfilter/vf_stack_qsv.c
>
> diff --git a/configure b/configure
> index 6bfd98b384..89adb3a374 100755
> --- a/configure
> +++ b/configure
> @@ -3705,6 +3705,12 @@ vpp_qsv_filter_select="qsvvpp"
> xfade_opencl_filter_deps="opencl"
> yadif_cuda_filter_deps="ffnvcodec"
> yadif_cuda_filter_deps_any="cuda_nvcc cuda_llvm"
> +hstack_qsv_filter_deps="libmfx"
> +hstack_qsv_filter_select="qsvvpp"
> +vstack_qsv_filter_deps="libmfx"
> +vstack_qsv_filter_select="qsvvpp"
> +xstack_qsv_filter_deps="libmfx"
> +xstack_qsv_filter_select="qsvvpp"
>
> # examples
> avio_list_dir_deps="avformat avutil"
> diff --git a/libavfilter/Makefile b/libavfilter/Makefile
> index bc81033e3f..16cf2c8712 100644
> --- a/libavfilter/Makefile
> +++ b/libavfilter/Makefile
> @@ -493,6 +493,9 @@ OBJS-$(CONFIG_YAEPBLUR_FILTER) += vf_yaepblur.o
> OBJS-$(CONFIG_ZMQ_FILTER) += f_zmq.o
> OBJS-$(CONFIG_ZOOMPAN_FILTER) += vf_zoompan.o
> OBJS-$(CONFIG_ZSCALE_FILTER) += vf_zscale.o
> +OBJS-$(CONFIG_HSTACK_QSV_FILTER) += vf_stack_qsv.o framesync.o
> +OBJS-$(CONFIG_VSTACK_QSV_FILTER) += vf_stack_qsv.o framesync.o
> +OBJS-$(CONFIG_XSTACK_QSV_FILTER) += vf_stack_qsv.o framesync.o
>
> OBJS-$(CONFIG_ALLRGB_FILTER) += vsrc_testsrc.o
> OBJS-$(CONFIG_ALLYUV_FILTER) += vsrc_testsrc.o
> diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
> index c6afef835f..278ccb99a9 100644
> --- a/libavfilter/allfilters.c
> +++ b/libavfilter/allfilters.c
> @@ -471,6 +471,9 @@ extern const AVFilter ff_vf_yaepblur;
> extern const AVFilter ff_vf_zmq;
> extern const AVFilter ff_vf_zoompan;
> extern const AVFilter ff_vf_zscale;
> +extern const AVFilter ff_vf_hstack_qsv;
> +extern const AVFilter ff_vf_vstack_qsv;
> +extern const AVFilter ff_vf_xstack_qsv;
>
> extern const AVFilter ff_vsrc_allrgb;
> extern const AVFilter ff_vsrc_allyuv;
> diff --git a/libavfilter/vf_stack_qsv.c b/libavfilter/vf_stack_qsv.c
> new file mode 100644
> index 0000000000..87f611eece
> --- /dev/null
> +++ b/libavfilter/vf_stack_qsv.c
> @@ -0,0 +1,499 @@
> +/*
> + * 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
> + */
> +
> +/**
> + * @file
> + * Hardware accelerated hstack, vstack and xstack filters based on Intel Quick Sync Video VPP
> + */
> +
> +#include "libavutil/opt.h"
> +#include "libavutil/common.h"
> +#include "libavutil/pixdesc.h"
> +#include "libavutil/eval.h"
> +#include "libavutil/hwcontext.h"
> +#include "libavutil/avstring.h"
> +#include "libavutil/avassert.h"
> +#include "libavutil/imgutils.h"
> +#include "libavutil/mathematics.h"
> +#include "libavutil/parseutils.h"
> +
> +#include "internal.h"
> +#include "avfilter.h"
"avfilter.h" has been included in lots of *.h like "internal.h" and
"qsvvpp.h", hence seems to be redundant here.
> +#include "filters.h"
> +#include "formats.h"
> +#include "video.h"
> +
> +#include "framesync.h"
> +#include "qsvvpp.h"
> +
> +#define OFFSET(x) offsetof(QSVStackContext, x)
> +#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM)
> +
> +enum {
> + QSV_STACK_H = 0,
> + QSV_STACK_V = 1,
> + QSV_STACK_X = 2
> +};
> +
> +typedef struct QSVStackContext {
> + const AVClass *class;
> + QSVVPPContext *qsv;
> + QSVVPPParam qsv_param;
> + mfxExtVPPComposite comp_conf;
> + int mode;
> + FFFrameSync fs;
> +
> + /* Options */
> + int nb_inputs;
> + int shortest;
> + double scale;
> + char *layout;
> + uint8_t fillcolor[4];
> + char *fillcolor_str;
> + int fillcolor_enable;
> +} QSVStackContext;
> +
> +static void rgb2yuv(float r, float g, float b, int *y, int *u, int *v, int depth)
> +{
> + *y = ((0.21260*219.0/255.0) * r + (0.71520*219.0/255.0) * g +
> + (0.07220*219.0/255.0) * b) * ((1 << depth) - 1);
> + *u = (-(0.11457*224.0/255.0) * r - (0.38543*224.0/255.0) * g +
> + (0.50000*224.0/255.0) * b + 0.5) * ((1 << depth) - 1);
> + *v = ((0.50000*224.0/255.0) * r - (0.45415*224.0/255.0) * g -
> + (0.04585*224.0/255.0) * b + 0.5) * ((1 << depth) - 1);
> +}
> +
> +static int process_frame(FFFrameSync *fs)
> +{
> + AVFilterContext *ctx = fs->parent;
> + QSVStackContext *sctx = fs->opaque;
> + AVFrame *frame = NULL;
> + int ret = 0, i;
> +
> + for (i = 0; i < ctx->nb_inputs; i++) {
> + ret = ff_framesync_get_frame(fs, i, &frame, 0);
> + if (ret == 0)
> + ret = ff_qsvvpp_filter_frame(sctx->qsv, ctx->inputs[i], frame);
> + if (ret < 0 && ret != AVERROR(EAGAIN))
> + break;
> + }
> +
> + if (ret == 0 && sctx->qsv->got_frame == 0) {
> + for (i = 0; i < ctx->nb_inputs; i++)
> + FF_FILTER_FORWARD_WANTED(ctx->outputs[0], ctx->inputs[i]);
> +
> + ret = FFERROR_NOT_READY;
> + }
> +
> + return ret;
> +}
> +
> +static int init_framesync(AVFilterContext *ctx)
> +{
> + QSVStackContext *sctx = ctx->priv;
> + int ret, i;
> +
> + ret = ff_framesync_init(&sctx->fs, ctx, ctx->nb_inputs);
> +
> + if (ret < 0)
> + return ret;
> +
> + sctx->fs.on_event = process_frame;
> + sctx->fs.opaque = sctx;
> +
> + for (i = 0; i < ctx->nb_inputs; i++) {
> + FFFrameSyncIn *in = &sctx->fs.in[i];
> + in->before = EXT_STOP;
> + in->after = sctx->shortest ? EXT_STOP : EXT_INFINITY;
> + in->sync = i ? 1 : 2;
> + in->time_base = ctx->inputs[i]->time_base;
> + }
> +
> + return ff_framesync_configure(&sctx->fs);
> +}
> +
> +#define SET_INPUT_STREAM(is, x, y, w, h) do { \
> + is->DstX = x; \
> + is->DstY = y; \
> + is->DstW = w; \
> + is->DstH = h; \
> + is->GlobalAlpha = 255; \
> + is->GlobalAlphaEnable = 1; \
> + is->PixelAlphaEnable = 0; \
> + } while (0)
> +
> +static int config_output(AVFilterLink *outlink)
> +{
> + AVFilterContext *ctx = outlink->src;
> + QSVStackContext *sctx = ctx->priv;
> + AVFilterLink *inlink0 = ctx->inputs[0];
> + int width, height, i, ret;
> + enum AVPixelFormat in_format;
> + int depth = 8;
> +
> + if (inlink0->format == AV_PIX_FMT_QSV) {
> + if (!inlink0->hw_frames_ctx || !inlink0->hw_frames_ctx->data)
> + return AVERROR(EINVAL);
> +
> + in_format = ((AVHWFramesContext*)inlink0->hw_frames_ctx->data)->sw_format;
> + } else
> + in_format = inlink0->format;
> +
> + sctx->qsv_param.out_sw_format = in_format;
> +
> + for (i = 1; i < sctx->nb_inputs; i++) {
> + AVFilterLink *inlink = ctx->inputs[i];
> +
> + if (inlink0->format == AV_PIX_FMT_QSV) {
> + AVHWFramesContext *hwfc0 = (AVHWFramesContext *)inlink0->hw_frames_ctx->data;
> + AVHWFramesContext *hwfc = (AVHWFramesContext *)inlink->hw_frames_ctx->data;
> +
> + if (inlink0->format != inlink->format) {
> + av_log(ctx, AV_LOG_ERROR, "Mixing hardware and software pixel formats is not supported.\n");
> +
> + return AVERROR(EINVAL);
> + } else if (hwfc0->device_ctx != hwfc->device_ctx) {
> + av_log(ctx, AV_LOG_ERROR, "Inputs with different underlying QSV devices are forbidden.\n");
> +
> + return AVERROR(EINVAL);
> + }
> + }
> + }
> +
> + if (in_format == AV_PIX_FMT_P010)
> + depth = 10;
> +
> + if (sctx->fillcolor_enable) {
> + int Y, U, V;
> +
> + rgb2yuv(sctx->fillcolor[0] / 255.0, sctx->fillcolor[1] / 255.0,
> + sctx->fillcolor[2] / 255.0, &Y, &U, &V, depth);
> + sctx->comp_conf.Y = Y;
> + sctx->comp_conf.U = U;
> + sctx->comp_conf.V = V;
> + }
> +
> + if (sctx->mode == QSV_STACK_H) {
> + height = inlink0->h * sctx->scale;
> + width = 0;
> +
> + for (i = 0; i < sctx->nb_inputs; i++) {
> + AVFilterLink *inlink = ctx->inputs[i];
> + mfxVPPCompInputStream *is = &sctx->comp_conf.InputStream[i];
> +
> + if (inlink0->h != inlink->h) {
> + av_log(ctx, AV_LOG_ERROR, "Input %d height %d does not match input %d height %d.\n", i, inlink->h, 0, inlink0->h);
> + return AVERROR(EINVAL);
> + }
> +
> + SET_INPUT_STREAM(is, width, 0, inlink->w * sctx->scale, inlink->h * sctx->scale);
> + width += inlink->w * sctx->scale;
> + }
> + } else if (sctx->mode == QSV_STACK_V) {
> + height = 0;
> + width = inlink0->w * sctx->scale;
> +
> + for (i = 0; i < sctx->nb_inputs; i++) {
> + AVFilterLink *inlink = ctx->inputs[i];
> + mfxVPPCompInputStream *is = &sctx->comp_conf.InputStream[i];
> +
> + if (inlink0->w != inlink->w) {
> + av_log(ctx, AV_LOG_ERROR, "Input %d width %d does not match input %d width %d.\n", i, inlink->w, 0, inlink0->w);
> + return AVERROR(EINVAL);
> + }
> +
> + SET_INPUT_STREAM(is, 0, height, inlink->w * sctx->scale, inlink->h * sctx->scale);
> + height += inlink->h * sctx->scale;
> + }
> + } else {
> + char *arg, *p = sctx->layout, *saveptr = NULL;
> + char *arg2, *p2, *saveptr2 = NULL;
> + char *arg3, *p3, *saveptr3 = NULL;
> + int inw, inh, size, j;
> +
> + width = ctx->inputs[0]->w * sctx->scale;
> + height = ctx->inputs[0]->h * sctx->scale;
> +
> + for (i = 0; i < sctx->nb_inputs; i++) {
> + AVFilterLink *inlink = ctx->inputs[i];
> + mfxVPPCompInputStream *is = &sctx->comp_conf.InputStream[i];
> +
> + if (!(arg = av_strtok(p, "|", &saveptr)))
> + return AVERROR(EINVAL);
> +
> + p = NULL;
> + p2 = arg;
> + inw = inh = 0;
> +
> + for (j = 0; j < 2; j++) {
> + if (!(arg2 = av_strtok(p2, "_", &saveptr2)))
> + return AVERROR(EINVAL);
> +
> + p2 = NULL;
> + p3 = arg2;
> +
> + while ((arg3 = av_strtok(p3, "+", &saveptr3))) {
> + p3 = NULL;
> + if (sscanf(arg3, "w%d", &size) == 1) {
> + if (size == i || size < 0 || size >= sctx->nb_inputs)
> + return AVERROR(EINVAL);
> +
> + if (!j)
> + inw += ctx->inputs[size]->w * sctx->scale;
> + else
> + inh += ctx->inputs[size]->w * sctx->scale;
> + } else if (sscanf(arg3, "h%d", &size) == 1) {
> + if (size == i || size < 0 || size >= sctx->nb_inputs)
> + return AVERROR(EINVAL);
> +
> + if (!j)
> + inw += ctx->inputs[size]->h * sctx->scale;
> + else
> + inh += ctx->inputs[size]->h * sctx->scale;
> + } else if (sscanf(arg3, "%d", &size) == 1) {
> + if (size < 0)
> + return AVERROR(EINVAL);
> +
> + if (!j)
> + inw += size;
> + else
> + inh += size;
> + } else {
> + return AVERROR(EINVAL);
> + }
> + }
> + }
> +
> + SET_INPUT_STREAM(is, inw, inh, inlink->w * sctx->scale, inlink->h * sctx->scale);
> + width = FFMAX(width, inlink->w * sctx->scale + inw);
> + height = FFMAX(height, inlink->h * sctx->scale + inh);
> + }
> +
> + }
> +
> + outlink->w = width;
> + outlink->h = height;
> + outlink->frame_rate = inlink0->frame_rate;
> + outlink->time_base = av_inv_q(outlink->frame_rate);
> + outlink->sample_aspect_ratio = inlink0->sample_aspect_ratio;
> +
> + ret = init_framesync(ctx);
> +
> + if (ret < 0)
> + return ret;
> +
> + return ff_qsvvpp_create(ctx, &sctx->qsv, &sctx->qsv_param);
> +}
> +
> +/*
> + * Callback for qsvvpp
> + * @Note: qsvvpp composition does not generate PTS for result frame.
> + * so we assign the PTS from framesync to the output frame.
> + */
> +
> +static int filter_callback(AVFilterLink *outlink, AVFrame *frame)
> +{
> + QSVStackContext *sctx = outlink->src->priv;
> +
> + frame->pts = av_rescale_q(sctx->fs.pts,
> + sctx->fs.time_base, outlink->time_base);
> + return ff_filter_frame(outlink, frame);
> +}
> +
> +
> +static int stack_qsv_init(AVFilterContext *ctx)
> +{
> + QSVStackContext *sctx = ctx->priv;
> + int i, ret;
> +
> + if (!strcmp(ctx->filter->name, "hstack_qsv"))
> + sctx->mode = QSV_STACK_H;
> + else if (!strcmp(ctx->filter->name, "vstack_qsv"))
> + sctx->mode = QSV_STACK_V;
> + else {
> + av_assert0(strcmp(ctx->filter->name, "xstack_qsv") == 0);
> + sctx->mode = QSV_STACK_X;
> +
> + if (strcmp(sctx->fillcolor_str, "none") &&
> + av_parse_color(sctx->fillcolor, sctx->fillcolor_str, -1, ctx) >= 0) {
> + sctx->fillcolor_enable = 1;
> + } else {
> + sctx->fillcolor_enable = 0;
> + }
> +
> + if (!sctx->layout) {
> + if (sctx->nb_inputs == 2) {
> + sctx->layout = av_strdup("0_0|w0_0");
> +
> + if (!sctx->layout)
> + return AVERROR(ENOMEM);
> + } else {
> + av_log(ctx, AV_LOG_ERROR, "No layout specified.\n");
> +
> + return AVERROR(EINVAL);
> + }
> + }
> + }
> +
> + for (i = 0; i < sctx->nb_inputs; i++) {
> + AVFilterPad pad = { 0 };
> +
> + pad.type = AVMEDIA_TYPE_VIDEO;
> + pad.name = av_asprintf("input%d", i);
> +
> + if (!pad.name)
> + return AVERROR(ENOMEM);
> +
> + if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
> + av_freep(&pad.name);
> +
> + return ret;
> + }
> + }
> +
> + /* fill composite config */
> + sctx->comp_conf.Header.BufferId = MFX_EXTBUFF_VPP_COMPOSITE;
> + sctx->comp_conf.Header.BufferSz = sizeof(sctx->comp_conf);
> + sctx->comp_conf.NumInputStream = sctx->nb_inputs;
> + sctx->comp_conf.InputStream = av_mallocz_array(sctx->nb_inputs,
> + sizeof(*sctx->comp_conf.InputStream));
> + if (!sctx->comp_conf.InputStream)
> + return AVERROR(ENOMEM);
> +
> + /* initialize QSVVPP params */
> + sctx->qsv_param.filter_frame = filter_callback;
> + sctx->qsv_param.ext_buf = av_mallocz(sizeof(*sctx->qsv_param.ext_buf));
> +
> + if (!sctx->qsv_param.ext_buf)
> + return AVERROR(ENOMEM);
> +
> + sctx->qsv_param.ext_buf[0] = (mfxExtBuffer *)&sctx->comp_conf;
> + sctx->qsv_param.num_ext_buf = 1;
> + sctx->qsv_param.num_crop = 0;
> +
> + return 0;
> +}
> +
> +static av_cold void stack_qsv_uninit(AVFilterContext *ctx)
> +{
> + QSVStackContext *sctx = ctx->priv;
> + int i;
> +
> + ff_qsvvpp_free(&sctx->qsv);
> + ff_framesync_uninit(&sctx->fs);
> + av_freep(&sctx->comp_conf.InputStream);
> + av_freep(&sctx->qsv_param.ext_buf);
> +
> + for (i = 0; i < ctx->nb_inputs; i++)
> + av_freep(&ctx->input_pads[i].name);
> +}
> +
> +static int stack_qsv_activate(AVFilterContext *ctx)
> +{
> + QSVStackContext *sctx = ctx->priv;
> + return ff_framesync_activate(&sctx->fs);
> +}
> +
> +static int stack_qsv_query_formats(AVFilterContext *ctx)
> +{
> + static const enum AVPixelFormat pixel_formats[] = {
> + AV_PIX_FMT_NV12,
> + AV_PIX_FMT_P010,
> + AV_PIX_FMT_QSV,
> + AV_PIX_FMT_NONE,
> + };
> + AVFilterFormats *pix_fmts = ff_make_format_list(pixel_formats);
> +
> + return ff_set_common_formats(ctx, pix_fmts);
> +}
> +
> +static const AVFilterPad stack_qsv_outputs[] = {
> + {
> + .name = "default",
> + .type = AVMEDIA_TYPE_VIDEO,
> + .config_props = config_output,
> + },
> +
> + { NULL }
> +};
> +
> +static const AVOption stack_qsv_options[] = {
> + { "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 2, 72, .flags = FLAGS },
> + { "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
> + { "scale", "set scale factor", OFFSET(scale), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 }, 0.125, 8, FLAGS },
> + { NULL }
> +};
> +
> +#define hstack_qsv_options stack_qsv_options
> +AVFILTER_DEFINE_CLASS(hstack_qsv);
> +
> +const AVFilter ff_vf_hstack_qsv = {
> + .name = "hstack_qsv",
> + .description = NULL_IF_CONFIG_SMALL("Quick Sync Video hstack."),
> + .priv_size = sizeof(QSVStackContext),
> + .priv_class = &hstack_qsv_class,
> + .query_formats = stack_qsv_query_formats,
> + .outputs = stack_qsv_outputs,
> + .init = stack_qsv_init,
> + .uninit = stack_qsv_uninit,
> + .activate = stack_qsv_activate,
> + .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
> + .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
> +};
> +
> +#define vstack_qsv_options stack_qsv_options
> +AVFILTER_DEFINE_CLASS(vstack_qsv);
> +
> +const AVFilter ff_vf_vstack_qsv = {
> + .name = "vstack_qsv",
> + .description = NULL_IF_CONFIG_SMALL("Quick Sync Video vstack."),
> + .priv_size = sizeof(QSVStackContext),
> + .priv_class = &vstack_qsv_class,
> + .query_formats = stack_qsv_query_formats,
> + .outputs = stack_qsv_outputs,
> + .init = stack_qsv_init,
> + .uninit = stack_qsv_uninit,
> + .activate = stack_qsv_activate,
> + .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
> + .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
> +};
> +
> +static const AVOption xstack_qsv_options[] = {
> + { "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 2, 72, .flags = FLAGS },
> + { "layout", "set custom layout", OFFSET(layout), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, .flags = FLAGS },
> + { "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
> + { "fill", "set the color for unused pixels", OFFSET(fillcolor_str), AV_OPT_TYPE_STRING, {.str = "none"}, .flags = FLAGS },
> + { "scale", "set scale factor", OFFSET(scale), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 }, 0.125, 8, FLAGS },
> + { NULL }
> +};
> +
> +AVFILTER_DEFINE_CLASS(xstack_qsv);
> +
> +const AVFilter ff_vf_xstack_qsv = {
> + .name = "xstack_qsv",
> + .description = NULL_IF_CONFIG_SMALL("Quick Sync Video xstack."),
> + .priv_size = sizeof(QSVStackContext),
> + .priv_class = &xstack_qsv_class,
> + .query_formats = stack_qsv_query_formats,
> + .outputs = stack_qsv_outputs,
> + .init = stack_qsv_init,
> + .uninit = stack_qsv_uninit,
> + .activate = stack_qsv_activate,
> + .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
> + .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
> +};
> --
> 2.25.1
Thanks for the stack related patch, functionally works for me at the
last attempt weeks ago.
The performance is explicitly faster than the combination of sets of
overlay_qsv filters on the platform I tested.
Since qsv stack filters support scale factors (and customized layout
for xstack_qsv),
would you please help to provide some docs for these new qsv filters
to elaborate more like[1],
cmdline examples would help a lot for users, especially for xstack maybe.
[1] https://ffmpeg.org/ffmpeg-all.html#vstack
- linjie
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