FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/f_select.c
Date: 2024-07-26 21:54:09
Exec Total Coverage
Lines: 165 198 83.3%
Functions: 10 11 90.9%
Branches: 62 104 59.6%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2011 Stefano Sabatini
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * filter for selecting which frame passes in the filterchain
24 */
25
26 #include "config_components.h"
27
28 #include "libavutil/avstring.h"
29 #include "libavutil/eval.h"
30 #include "libavutil/fifo.h"
31 #include "libavutil/imgutils.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/pixdesc.h"
35 #include "avfilter.h"
36 #include "audio.h"
37 #include "formats.h"
38 #include "internal.h"
39 #include "video.h"
40 #include "scene_sad.h"
41
42 static const char *const var_names[] = {
43 "TB", ///< timebase
44
45 "pts", ///< original pts in the file of the frame
46 "start_pts", ///< first PTS in the stream, expressed in TB units
47 "prev_pts", ///< previous frame PTS
48 "prev_selected_pts", ///< previous selected frame PTS
49
50 "t", ///< timestamp expressed in seconds
51 "start_t", ///< first PTS in the stream, expressed in seconds
52 "prev_t", ///< previous frame time
53 "prev_selected_t", ///< previously selected time
54
55 "pict_type", ///< the type of picture in the movie
56 "I",
57 "P",
58 "B",
59 "S",
60 "SI",
61 "SP",
62 "BI",
63 "PICT_TYPE_I",
64 "PICT_TYPE_P",
65 "PICT_TYPE_B",
66 "PICT_TYPE_S",
67 "PICT_TYPE_SI",
68 "PICT_TYPE_SP",
69 "PICT_TYPE_BI",
70
71 "interlace_type", ///< the frame interlace type
72 "PROGRESSIVE",
73 "TOPFIRST",
74 "BOTTOMFIRST",
75
76 "consumed_samples_n",///< number of samples consumed by the filter (only audio)
77 "samples_n", ///< number of samples in the current frame (only audio)
78 "sample_rate", ///< sample rate (only audio)
79
80 "n", ///< frame number (starting from zero)
81 "selected_n", ///< selected frame number (starting from zero)
82 "prev_selected_n", ///< number of the last selected frame
83
84 "key", ///< tell if the frame is a key frame
85 #if FF_API_FRAME_PKT
86 "pos", ///< original position in the file of the frame
87 #endif
88
89 "scene",
90
91 "concatdec_select", ///< frame is within the interval set by the concat demuxer
92
93 "ih", ///< ih: Represents the height of the input video frame.
94 "iw", ///< iw: Represents the width of the input video frame.
95
96 NULL
97 };
98
99 enum var_name {
100 VAR_TB,
101
102 VAR_PTS,
103 VAR_START_PTS,
104 VAR_PREV_PTS,
105 VAR_PREV_SELECTED_PTS,
106
107 VAR_T,
108 VAR_START_T,
109 VAR_PREV_T,
110 VAR_PREV_SELECTED_T,
111
112 VAR_PICT_TYPE,
113 VAR_I,
114 VAR_P,
115 VAR_B,
116 VAR_S,
117 VAR_SI,
118 VAR_SP,
119 VAR_BI,
120 VAR_PICT_TYPE_I,
121 VAR_PICT_TYPE_P,
122 VAR_PICT_TYPE_B,
123 VAR_PICT_TYPE_S,
124 VAR_PICT_TYPE_SI,
125 VAR_PICT_TYPE_SP,
126 VAR_PICT_TYPE_BI,
127
128 VAR_INTERLACE_TYPE,
129 VAR_INTERLACE_TYPE_P,
130 VAR_INTERLACE_TYPE_T,
131 VAR_INTERLACE_TYPE_B,
132
133 VAR_CONSUMED_SAMPLES_N,
134 VAR_SAMPLES_N,
135 VAR_SAMPLE_RATE,
136
137 VAR_N,
138 VAR_SELECTED_N,
139 VAR_PREV_SELECTED_N,
140
141 VAR_KEY,
142 #if FF_API_FRAME_PKT
143 VAR_POS,
144 #endif
145
146 VAR_SCENE,
147
148 VAR_CONCATDEC_SELECT,
149
150 VAR_IH,
151 VAR_IW,
152
153 VAR_VARS_NB
154 };
155
156 typedef struct SelectContext {
157 const AVClass *class;
158 char *expr_str;
159 AVExpr *expr;
160 double var_values[VAR_VARS_NB];
161 int bitdepth;
162 int nb_planes;
163 ptrdiff_t width[4];
164 ptrdiff_t height[4];
165 int do_scene_detect; ///< 1 if the expression requires scene detection variables, 0 otherwise
166 ff_scene_sad_fn sad; ///< Sum of the absolute difference function (scene detect only)
167 double prev_mafd; ///< previous MAFD (scene detect only)
168 AVFrame *prev_picref; ///< previous frame (scene detect only)
169 double select;
170 int select_out; ///< mark the selected output pad index
171 int nb_outputs;
172 } SelectContext;
173
174 #define OFFSET(x) offsetof(SelectContext, x)
175 #define DEFINE_OPTIONS(filt_name, FLAGS) \
176 static const AVOption filt_name##_options[] = { \
177 { "expr", "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \
178 { "e", "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \
179 { "outputs", "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \
180 { "n", "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \
181 { NULL } \
182 }
183
184 static int request_frame(AVFilterLink *outlink);
185
186 5 static av_cold int init(AVFilterContext *ctx)
187 {
188 5 SelectContext *select = ctx->priv;
189 int i, ret;
190
191
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 5 if ((ret = av_expr_parse(&select->expr, select->expr_str,
192 var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
193 ✗ av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n",
194 select->expr_str);
195 ✗ return ret;
196 }
197 5 select->do_scene_detect = !!strstr(select->expr_str, "scene");
198
199
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 10 for (i = 0; i < select->nb_outputs; i++) {
200 5 AVFilterPad pad = { 0 };
201
202 5 pad.name = av_asprintf("output%d", i);
203
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 5 if (!pad.name)
204 ✗ return AVERROR(ENOMEM);
205 5 pad.type = ctx->filter->inputs[0].type;
206 5 pad.request_frame = request_frame;
207
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 5 if ((ret = ff_append_outpad_free_name(ctx, &pad)) < 0)
208 ✗ return ret;
209 }
210
211 5 return 0;
212 }
213
214 #define INTERLACE_TYPE_P 0
215 #define INTERLACE_TYPE_T 1
216 #define INTERLACE_TYPE_B 2
217
218 3 static int config_input(AVFilterLink *inlink)
219 {
220 3 SelectContext *select = inlink->dst->priv;
221 3 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
222 9 int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
223
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 5 (desc->flags & AV_PIX_FMT_FLAG_PLANAR) &&
224
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 2 desc->nb_components >= 3;
225
226 3 select->bitdepth = desc->comp[0].depth;
227
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 3 select->nb_planes = is_yuv ? 1 : av_pix_fmt_count_planes(inlink->format);
228
229
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 6 for (int plane = 0; plane < select->nb_planes; plane++) {
230 3 ptrdiff_t line_size = av_image_get_linesize(inlink->format, inlink->w, plane);
231 3 int vsub = desc->log2_chroma_h;
232
233 3 select->width[plane] = line_size >> (select->bitdepth > 8);
234
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 3 select->height[plane] = plane == 1 || plane == 2 ? AV_CEIL_RSHIFT(inlink->h, vsub) : inlink->h;
235 }
236
237 3 select->var_values[VAR_N] = 0.0;
238 3 select->var_values[VAR_SELECTED_N] = 0.0;
239
240 3 select->var_values[VAR_TB] = av_q2d(inlink->time_base);
241
242 3 select->var_values[VAR_PREV_SELECTED_N] = NAN;
243 3 select->var_values[VAR_PREV_PTS] = NAN;
244 3 select->var_values[VAR_PREV_SELECTED_PTS] = NAN;
245 3 select->var_values[VAR_PREV_SELECTED_T] = NAN;
246 3 select->var_values[VAR_PREV_T] = NAN;
247 3 select->var_values[VAR_START_PTS] = NAN;
248 3 select->var_values[VAR_START_T] = NAN;
249
250 3 select->var_values[VAR_I] = AV_PICTURE_TYPE_I;
251 3 select->var_values[VAR_P] = AV_PICTURE_TYPE_P;
252 3 select->var_values[VAR_B] = AV_PICTURE_TYPE_B;
253 3 select->var_values[VAR_SI] = AV_PICTURE_TYPE_SI;
254 3 select->var_values[VAR_SP] = AV_PICTURE_TYPE_SP;
255 3 select->var_values[VAR_BI] = AV_PICTURE_TYPE_BI;
256 3 select->var_values[VAR_PICT_TYPE_I] = AV_PICTURE_TYPE_I;
257 3 select->var_values[VAR_PICT_TYPE_P] = AV_PICTURE_TYPE_P;
258 3 select->var_values[VAR_PICT_TYPE_B] = AV_PICTURE_TYPE_B;
259 3 select->var_values[VAR_PICT_TYPE_SI] = AV_PICTURE_TYPE_SI;
260 3 select->var_values[VAR_PICT_TYPE_SP] = AV_PICTURE_TYPE_SP;
261 3 select->var_values[VAR_PICT_TYPE_BI] = AV_PICTURE_TYPE_BI;
262
263 3 select->var_values[VAR_INTERLACE_TYPE_P] = INTERLACE_TYPE_P;
264 3 select->var_values[VAR_INTERLACE_TYPE_T] = INTERLACE_TYPE_T;
265 3 select->var_values[VAR_INTERLACE_TYPE_B] = INTERLACE_TYPE_B;
266
267 3 select->var_values[VAR_PICT_TYPE] = NAN;
268 3 select->var_values[VAR_INTERLACE_TYPE] = NAN;
269 3 select->var_values[VAR_SCENE] = NAN;
270 3 select->var_values[VAR_CONSUMED_SAMPLES_N] = NAN;
271 3 select->var_values[VAR_SAMPLES_N] = NAN;
272
273 3 select->var_values[VAR_IH] = NAN;
274 3 select->var_values[VAR_IW] = NAN;
275
276 3 select->var_values[VAR_SAMPLE_RATE] =
277
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 3 inlink->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
278
279
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 3 if (CONFIG_SELECT_FILTER && select->do_scene_detect) {
280
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 1 select->sad = ff_scene_sad_get_fn(select->bitdepth == 8 ? 8 : 16);
281
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 1 if (!select->sad)
282 ✗ return AVERROR(EINVAL);
283 }
284 3 return 0;
285 }
286
287 1308 static double get_scene_score(AVFilterContext *ctx, AVFrame *frame)
288 {
289 1308 double ret = 0;
290 1308 SelectContext *select = ctx->priv;
291 1308 AVFrame *prev_picref = select->prev_picref;
292
293
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 1308 if (prev_picref &&
294
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 1307 frame->height == prev_picref->height &&
295
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 1307 frame->width == prev_picref->width) {
296 1307 uint64_t sad = 0;
297 double mafd, diff;
298 1307 uint64_t count = 0;
299
300
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 2614 for (int plane = 0; plane < select->nb_planes; plane++) {
301 uint64_t plane_sad;
302 1307 select->sad(prev_picref->data[plane], prev_picref->linesize[plane],
303 1307 frame->data[plane], frame->linesize[plane],
304 select->width[plane], select->height[plane], &plane_sad);
305 1307 sad += plane_sad;
306 1307 count += select->width[plane] * select->height[plane];
307 }
308
309 1307 mafd = (double)sad / count / (1ULL << (select->bitdepth - 8));
310 1307 diff = fabs(mafd - select->prev_mafd);
311
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 1307 ret = av_clipf(FFMIN(mafd, diff) / 100., 0, 1);
312 1307 select->prev_mafd = mafd;
313 1307 av_frame_free(&prev_picref);
314 }
315 1308 select->prev_picref = av_frame_clone(frame);
316 1308 return ret;
317 }
318
319 1408 static double get_concatdec_select(AVFrame *frame, int64_t pts)
320 {
321 1408 AVDictionary *metadata = frame->metadata;
322 1408 AVDictionaryEntry *start_time_entry = av_dict_get(metadata, "lavf.concatdec.start_time", NULL, 0);
323 1408 AVDictionaryEntry *duration_entry = av_dict_get(metadata, "lavf.concatdec.duration", NULL, 0);
324
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 1408 if (start_time_entry) {
325 ✗ int64_t start_time = strtoll(start_time_entry->value, NULL, 10);
326 ✗ if (pts >= start_time) {
327 ✗ if (duration_entry) {
328 ✗ int64_t duration = strtoll(duration_entry->value, NULL, 10);
329 ✗ if (pts < start_time + duration)
330 ✗ return -1;
331 else
332 ✗ return 0;
333 }
334 ✗ return -1;
335 }
336 ✗ return 0;
337 }
338 1408 return NAN;
339 }
340
341 1408 static void select_frame(AVFilterContext *ctx, AVFrame *frame)
342 {
343 1408 SelectContext *select = ctx->priv;
344 1408 AVFilterLink *inlink = ctx->inputs[0];
345 double res;
346
347
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 1408 if (isnan(select->var_values[VAR_START_PTS]))
348
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 3 select->var_values[VAR_START_PTS] = TS2D(frame->pts);
349
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 1408 if (isnan(select->var_values[VAR_START_T]))
350
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 3 select->var_values[VAR_START_T] = TS2D(frame->pts) * av_q2d(inlink->time_base);
351
352 1408 select->var_values[VAR_N ] = inlink->frame_count_out;
353
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 1408 select->var_values[VAR_PTS] = TS2D(frame->pts);
354
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 1408 select->var_values[VAR_T ] = TS2D(frame->pts) * av_q2d(inlink->time_base);
355 #if FF_API_FRAME_PKT
356 FF_DISABLE_DEPRECATION_WARNINGS
357
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 1408 select->var_values[VAR_POS] = frame->pkt_pos == -1 ? NAN : frame->pkt_pos;
358 FF_ENABLE_DEPRECATION_WARNINGS
359 #endif
360
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 1408 select->var_values[VAR_KEY] = !!(frame->flags & AV_FRAME_FLAG_KEY);
361 1408 select->var_values[VAR_CONCATDEC_SELECT] = get_concatdec_select(frame, av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q));
362
363
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 1408 switch (inlink->type) {
364 ✗ case AVMEDIA_TYPE_AUDIO:
365 ✗ select->var_values[VAR_SAMPLES_N] = frame->nb_samples;
366 ✗ break;
367
368 1408 case AVMEDIA_TYPE_VIDEO:
369 1408 select->var_values[VAR_IH] = frame->height;
370 1408 select->var_values[VAR_IW] = frame->width;
371
372 1408 select->var_values[VAR_INTERLACE_TYPE] =
373
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 1408 !(frame->flags & AV_FRAME_FLAG_INTERLACED) ? INTERLACE_TYPE_P :
374 ✗ (frame->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST) ? INTERLACE_TYPE_T : INTERLACE_TYPE_B;
375 1408 select->var_values[VAR_PICT_TYPE] = frame->pict_type;
376
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 1408 if (select->do_scene_detect) {
377 char buf[32];
378 1308 select->var_values[VAR_SCENE] = get_scene_score(ctx, frame);
379 // TODO: document metadata
380 1308 snprintf(buf, sizeof(buf), "%f", select->var_values[VAR_SCENE]);
381 1308 av_dict_set(&frame->metadata, "lavfi.scene_score", buf, 0);
382 }
383 1408 break;
384 }
385
386 1408 select->select = res = av_expr_eval(select->expr, select->var_values, NULL);
387 1408 av_log(inlink->dst, AV_LOG_DEBUG,
388 "n:%f pts:%f t:%f key:%d",
389 select->var_values[VAR_N],
390 select->var_values[VAR_PTS],
391 select->var_values[VAR_T],
392 1408 !!(frame->flags & AV_FRAME_FLAG_KEY));
393
394
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 1408 switch (inlink->type) {
395 1408 case AVMEDIA_TYPE_VIDEO:
396 1408 av_log(inlink->dst, AV_LOG_DEBUG, " interlace_type:%c pict_type:%c scene:%f",
397
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 1408 !(frame->flags & AV_FRAME_FLAG_INTERLACED) ? 'P' :
398 ✗ (frame->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST) ? 'T' : 'B',
399 1408 av_get_picture_type_char(frame->pict_type),
400 select->var_values[VAR_SCENE]);
401 1408 break;
402 ✗ case AVMEDIA_TYPE_AUDIO:
403 ✗ av_log(inlink->dst, AV_LOG_DEBUG, " samples_n:%d consumed_samples_n:%f",
404 frame->nb_samples,
405 select->var_values[VAR_CONSUMED_SAMPLES_N]);
406 ✗ break;
407 }
408
409
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 1408 if (res == 0) {
410 1355 select->select_out = -1; /* drop */
411
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 53 } else if (isnan(res) || res < 0) {
412 ✗ select->select_out = 0; /* first output */
413 } else {
414
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 53 select->select_out = FFMIN(ceilf(res)-1, select->nb_outputs-1); /* other outputs */
415 }
416
417 1408 av_log(inlink->dst, AV_LOG_DEBUG, " -> select:%f select_out:%d\n", res, select->select_out);
418
419
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 1408 if (res) {
420 53 select->var_values[VAR_PREV_SELECTED_N] = select->var_values[VAR_N];
421 53 select->var_values[VAR_PREV_SELECTED_PTS] = select->var_values[VAR_PTS];
422 53 select->var_values[VAR_PREV_SELECTED_T] = select->var_values[VAR_T];
423 53 select->var_values[VAR_SELECTED_N] += 1.0;
424
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 53 if (inlink->type == AVMEDIA_TYPE_AUDIO)
425 ✗ select->var_values[VAR_CONSUMED_SAMPLES_N] += frame->nb_samples;
426 }
427
428 1408 select->var_values[VAR_PREV_PTS] = select->var_values[VAR_PTS];
429 1408 select->var_values[VAR_PREV_T] = select->var_values[VAR_T];
430 1408 }
431
432 1408 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
433 {
434 1408 AVFilterContext *ctx = inlink->dst;
435 1408 SelectContext *select = ctx->priv;
436
437 1408 select_frame(ctx, frame);
438
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 1408 if (select->select)
439 53 return ff_filter_frame(ctx->outputs[select->select_out], frame);
440
441 1355 av_frame_free(&frame);
442 1355 return 0;
443 }
444
445 1412 static int request_frame(AVFilterLink *outlink)
446 {
447 1412 AVFilterLink *inlink = outlink->src->inputs[0];
448 1412 int ret = ff_request_frame(inlink);
449 1412 return ret;
450 }
451
452 5 static av_cold void uninit(AVFilterContext *ctx)
453 {
454 5 SelectContext *select = ctx->priv;
455
456 5 av_expr_free(select->expr);
457 5 select->expr = NULL;
458
459
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 5 if (select->do_scene_detect) {
460 1 av_frame_free(&select->prev_picref);
461 }
462 5 }
463
464 #if CONFIG_ASELECT_FILTER
465
466 DEFINE_OPTIONS(aselect, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
467 AVFILTER_DEFINE_CLASS(aselect);
468
469 ✗ static av_cold int aselect_init(AVFilterContext *ctx)
470 {
471 ✗ SelectContext *select = ctx->priv;
472 int ret;
473
474 ✗ if ((ret = init(ctx)) < 0)
475 ✗ return ret;
476
477 ✗ if (select->do_scene_detect) {
478 ✗ av_log(ctx, AV_LOG_ERROR, "Scene detection is ignored in aselect filter\n");
479 ✗ return AVERROR(EINVAL);
480 }
481
482 ✗ return 0;
483 }
484
485 static const AVFilterPad avfilter_af_aselect_inputs[] = {
486 {
487 .name = "default",
488 .type = AVMEDIA_TYPE_AUDIO,
489 .config_props = config_input,
490 .filter_frame = filter_frame,
491 },
492 };
493
494 const AVFilter ff_af_aselect = {
495 .name = "aselect",
496 .description = NULL_IF_CONFIG_SMALL("Select audio frames to pass in output."),
497 .init = aselect_init,
498 .uninit = uninit,
499 .priv_size = sizeof(SelectContext),
500 FILTER_INPUTS(avfilter_af_aselect_inputs),
501 .priv_class = &aselect_class,
502 .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
503 };
504 #endif /* CONFIG_ASELECT_FILTER */
505
506 #if CONFIG_SELECT_FILTER
507
508 3 static int query_formats(AVFilterContext *ctx)
509 {
510 3 SelectContext *select = ctx->priv;
511
512
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 3 if (!select->do_scene_detect) {
513 2 return ff_default_query_formats(ctx);
514 } else {
515 static const enum AVPixelFormat pix_fmts[] = {
516 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, AV_PIX_FMT_RGBA,
517 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, AV_PIX_FMT_GRAY8,
518 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
519 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P,
520 AV_PIX_FMT_YUV420P10,
521 AV_PIX_FMT_NONE
522 };
523 1 return ff_set_common_formats_from_list(ctx, pix_fmts);
524 }
525 }
526
527 DEFINE_OPTIONS(select, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
528 AVFILTER_DEFINE_CLASS(select);
529
530 5 static av_cold int select_init(AVFilterContext *ctx)
531 {
532 int ret;
533
534
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 5 if ((ret = init(ctx)) < 0)
535 ✗ return ret;
536
537 5 return 0;
538 }
539
540 static const AVFilterPad avfilter_vf_select_inputs[] = {
541 {
542 .name = "default",
543 .type = AVMEDIA_TYPE_VIDEO,
544 .config_props = config_input,
545 .filter_frame = filter_frame,
546 },
547 };
548
549 const AVFilter ff_vf_select = {
550 .name = "select",
551 .description = NULL_IF_CONFIG_SMALL("Select video frames to pass in output."),
552 .init = select_init,
553 .uninit = uninit,
554 .priv_size = sizeof(SelectContext),
555 .priv_class = &select_class,
556 FILTER_INPUTS(avfilter_vf_select_inputs),
557 FILTER_QUERY_FUNC(query_formats),
558 .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS | AVFILTER_FLAG_METADATA_ONLY,
559 };
560 #endif /* CONFIG_SELECT_FILTER */
561