WebM VP8 Codec SDK
vp8_scalable_patterns
1 /*
2  * Copyright (c) 2012 The WebM project authors. All Rights Reserved.
3  *
4  * Use of this source code is governed by a BSD-style license
5  * that can be found in the LICENSE file in the root of the source
6  * tree. An additional intellectual property rights grant can be found
7  * in the file PATENTS. All contributing project authors may
8  * be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 
12 /*
13  * This is an example demonstrating how to implement a multi-layer VP8
14  * encoding scheme based on temporal scalability for video applications
15  * that benefit from a scalable bitstream.
16  */
17 #include <stdio.h>
18 #include <stdlib.h>
19 #include <stdarg.h>
20 #include <string.h>
21 #define VPX_CODEC_DISABLE_COMPAT 1
22 #include "vpx/vpx_encoder.h"
23 #include "vpx/vp8cx.h"
24 #define interface (vpx_codec_vp8_cx())
25 #define fourcc 0x30385056
26 
27 #define IVF_FILE_HDR_SZ (32)
28 #define IVF_FRAME_HDR_SZ (12)
29 
30 static void mem_put_le16(char *mem, unsigned int val) {
31  mem[0] = val;
32  mem[1] = val>>8;
33 }
34 
35 static void mem_put_le32(char *mem, unsigned int val) {
36  mem[0] = val;
37  mem[1] = val>>8;
38  mem[2] = val>>16;
39  mem[3] = val>>24;
40 }
41 
42 static void die(const char *fmt, ...) {
43  va_list ap;
44 
45  va_start(ap, fmt);
46  vprintf(fmt, ap);
47  if(fmt[strlen(fmt)-1] != '\n')
48  printf("\n");
49  exit(EXIT_FAILURE);
50 }
51 
52 static void die_codec(vpx_codec_ctx_t *ctx, const char *s) {
53  const char *detail = vpx_codec_error_detail(ctx);
54 
55  printf("%s: %s\n", s, vpx_codec_error(ctx));
56  if(detail)
57  printf(" %s\n",detail);
58  exit(EXIT_FAILURE);
59 }
60 
61 static int read_frame(FILE *f, vpx_image_t *img) {
62  size_t nbytes, to_read;
63  int res = 1;
64 
65  to_read = img->w*img->h*3/2;
66  nbytes = fread(img->planes[0], 1, to_read, f);
67  if(nbytes != to_read) {
68  res = 0;
69  if(nbytes > 0)
70  printf("Warning: Read partial frame. Check your width & height!\n");
71  }
72  return res;
73 }
74 
75 static void write_ivf_file_header(FILE *outfile,
76  const vpx_codec_enc_cfg_t *cfg,
77  int frame_cnt) {
78  char header[32];
79 
80  if(cfg->g_pass != VPX_RC_ONE_PASS && cfg->g_pass != VPX_RC_LAST_PASS)
81  return;
82  header[0] = 'D';
83  header[1] = 'K';
84  header[2] = 'I';
85  header[3] = 'F';
86  mem_put_le16(header+4, 0); /* version */
87  mem_put_le16(header+6, 32); /* headersize */
88  mem_put_le32(header+8, fourcc); /* headersize */
89  mem_put_le16(header+12, cfg->g_w); /* width */
90  mem_put_le16(header+14, cfg->g_h); /* height */
91  mem_put_le32(header+16, cfg->g_timebase.den); /* rate */
92  mem_put_le32(header+20, cfg->g_timebase.num); /* scale */
93  mem_put_le32(header+24, frame_cnt); /* length */
94  mem_put_le32(header+28, 0); /* unused */
95 
96  (void) fwrite(header, 1, 32, outfile);
97 }
98 
99 
100 static void write_ivf_frame_header(FILE *outfile,
101  const vpx_codec_cx_pkt_t *pkt)
102 {
103  char header[12];
104  vpx_codec_pts_t pts;
105 
106  if(pkt->kind != VPX_CODEC_CX_FRAME_PKT)
107  return;
108 
109  pts = pkt->data.frame.pts;
110  mem_put_le32(header, pkt->data.frame.sz);
111  mem_put_le32(header+4, pts&0xFFFFFFFF);
112  mem_put_le32(header+8, pts >> 32);
113 
114  (void) fwrite(header, 1, 12, outfile);
115 }
116 
117 static int mode_to_num_layers[12] = {1, 2, 2, 3, 3, 3, 3, 5, 2, 3, 3, 3};
118 
119 int main(int argc, char **argv) {
120  FILE *infile, *outfile[VPX_TS_MAX_LAYERS];
121  vpx_codec_ctx_t codec;
123  int frame_cnt = 0;
124  vpx_image_t raw;
125  vpx_codec_err_t res;
126  unsigned int width;
127  unsigned int height;
128  int frame_avail;
129  int got_data;
130  int flags = 0;
131  int i;
132  int pts = 0; /* PTS starts at 0 */
133  int frame_duration = 1; /* 1 timebase tick per frame */
134 
135  int layering_mode = 0;
136  int frames_in_layer[VPX_TS_MAX_LAYERS] = {0};
137  int layer_flags[VPX_TS_MAX_PERIODICITY] = {0};
138  int flag_periodicity;
139  int max_intra_size_pct;
140 
141  /* Check usage and arguments */
142  if (argc < 9)
143  die("Usage: %s <infile> <outfile> <width> <height> <rate_num> "
144  " <rate_den> <mode> <Rate_0> ... <Rate_nlayers-1>\n", argv[0]);
145 
146  width = strtol (argv[3], NULL, 0);
147  height = strtol (argv[4], NULL, 0);
148  if (width < 16 || width%2 || height <16 || height%2)
149  die ("Invalid resolution: %d x %d", width, height);
150 
151  if (!sscanf(argv[7], "%d", &layering_mode))
152  die ("Invalid mode %s", argv[7]);
153  if (layering_mode<0 || layering_mode>11)
154  die ("Invalid mode (0..11) %s", argv[7]);
155 
156  if (argc != 8+mode_to_num_layers[layering_mode])
157  die ("Invalid number of arguments");
158 
159  if (!vpx_img_alloc (&raw, VPX_IMG_FMT_I420, width, height, 32))
160  die ("Failed to allocate image", width, height);
161 
162  printf("Using %s\n",vpx_codec_iface_name(interface));
163 
164  /* Populate encoder configuration */
165  res = vpx_codec_enc_config_default(interface, &cfg, 0);
166  if(res) {
167  printf("Failed to get config: %s\n", vpx_codec_err_to_string(res));
168  return EXIT_FAILURE;
169  }
170 
171  /* Update the default configuration with our settings */
172  cfg.g_w = width;
173  cfg.g_h = height;
174 
175  /* Timebase format e.g. 30fps: numerator=1, demoninator=30 */
176  if (!sscanf (argv[5], "%d", &cfg.g_timebase.num ))
177  die ("Invalid timebase numerator %s", argv[5]);
178  if (!sscanf (argv[6], "%d", &cfg.g_timebase.den ))
179  die ("Invalid timebase denominator %s", argv[6]);
180 
181  for (i=8; i<8+mode_to_num_layers[layering_mode]; i++)
182  if (!sscanf(argv[i], "%ud", &cfg.ts_target_bitrate[i-8]))
183  die ("Invalid data rate %s", argv[i]);
184 
185  /* Real time parameters */
186  cfg.rc_dropframe_thresh = 0;
187  cfg.rc_end_usage = VPX_CBR;
188  cfg.rc_resize_allowed = 0;
189  cfg.rc_min_quantizer = 2;
190  cfg.rc_max_quantizer = 56;
191  cfg.rc_undershoot_pct = 100;
192  cfg.rc_overshoot_pct = 15;
193  cfg.rc_buf_initial_sz = 500;
194  cfg.rc_buf_optimal_sz = 600;
195  cfg.rc_buf_sz = 1000;
196 
197  /* Enable error resilient mode */
198  cfg.g_error_resilient = 1;
199  cfg.g_lag_in_frames = 0;
200  cfg.kf_mode = VPX_KF_DISABLED;
201 
202  /* Disable automatic keyframe placement */
203  cfg.kf_min_dist = cfg.kf_max_dist = 3000;
204 
205  /* Default setting for bitrate: used in special case of 1 layer (case 0). */
207 
208  /* Temporal scaling parameters: */
209  /* NOTE: The 3 prediction frames cannot be used interchangeably due to
210  * differences in the way they are handled throughout the code. The
211  * frames should be allocated to layers in the order LAST, GF, ARF.
212  * Other combinations work, but may produce slightly inferior results.
213  */
214  switch (layering_mode)
215  {
216  case 0:
217  {
218  /* 1-layer */
219  int ids[1] = {0};
220  cfg.ts_number_layers = 1;
221  cfg.ts_periodicity = 1;
222  cfg.ts_rate_decimator[0] = 1;
223  memcpy(cfg.ts_layer_id, ids, sizeof(ids));
224 
225  flag_periodicity = cfg.ts_periodicity;
226 
227  // Update L only.
228  layer_flags[0] = VPX_EFLAG_FORCE_KF |
230  break;
231  }
232  case 1:
233  {
234  /* 2-layers, 2-frame period */
235  int ids[2] = {0,1};
236  cfg.ts_number_layers = 2;
237  cfg.ts_periodicity = 2;
238  cfg.ts_rate_decimator[0] = 2;
239  cfg.ts_rate_decimator[1] = 1;
240  memcpy(cfg.ts_layer_id, ids, sizeof(ids));
241 
242  flag_periodicity = cfg.ts_periodicity;
243 #if 1
244  /* 0=L, 1=GF, Intra-layer prediction enabled */
245  layer_flags[0] = VPX_EFLAG_FORCE_KF |
248  layer_flags[1] = VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_LAST |
250 #else
251  /* 0=L, 1=GF, Intra-layer prediction disabled */
252  layer_flags[0] = VPX_EFLAG_FORCE_KF |
255  layer_flags[1] = VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_LAST |
257 #endif
258  break;
259  }
260 
261  case 2:
262  {
263  /* 2-layers, 3-frame period */
264  int ids[3] = {0,1,1};
265  cfg.ts_number_layers = 2;
266  cfg.ts_periodicity = 3;
267  cfg.ts_rate_decimator[0] = 3;
268  cfg.ts_rate_decimator[1] = 1;
269  memcpy(cfg.ts_layer_id, ids, sizeof(ids));
270 
271  flag_periodicity = cfg.ts_periodicity;
272 
273  /* 0=L, 1=GF, Intra-layer prediction enabled */
274  layer_flags[0] = VPX_EFLAG_FORCE_KF |
277  layer_flags[1] =
278  layer_flags[2] = VP8_EFLAG_NO_REF_GF |
281  break;
282  }
283 
284  case 3:
285  {
286  /* 3-layers, 6-frame period */
287  int ids[6] = {0,2,2,1,2,2};
288  cfg.ts_number_layers = 3;
289  cfg.ts_periodicity = 6;
290  cfg.ts_rate_decimator[0] = 6;
291  cfg.ts_rate_decimator[1] = 3;
292  cfg.ts_rate_decimator[2] = 1;
293  memcpy(cfg.ts_layer_id, ids, sizeof(ids));
294 
295  flag_periodicity = cfg.ts_periodicity;
296 
297  /* 0=L, 1=GF, 2=ARF, Intra-layer prediction enabled */
298  layer_flags[0] = VPX_EFLAG_FORCE_KF |
301  layer_flags[3] = VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_UPD_ARF |
303  layer_flags[1] =
304  layer_flags[2] =
305  layer_flags[4] =
306  layer_flags[5] = VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_LAST;
307  break;
308  }
309 
310  case 4:
311  {
312  /* 3-layers, 4-frame period */
313  int ids[4] = {0,2,1,2};
314  cfg.ts_number_layers = 3;
315  cfg.ts_periodicity = 4;
316  cfg.ts_rate_decimator[0] = 4;
317  cfg.ts_rate_decimator[1] = 2;
318  cfg.ts_rate_decimator[2] = 1;
319  memcpy(cfg.ts_layer_id, ids, sizeof(ids));
320 
321  flag_periodicity = cfg.ts_periodicity;
322 
323  /* 0=L, 1=GF, 2=ARF, Intra-layer prediction disabled */
324  layer_flags[0] = VPX_EFLAG_FORCE_KF |
327  layer_flags[2] = VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
330  layer_flags[1] =
331  layer_flags[3] = VP8_EFLAG_NO_REF_ARF |
334  break;
335  }
336 
337  case 5:
338  {
339  /* 3-layers, 4-frame period */
340  int ids[4] = {0,2,1,2};
341  cfg.ts_number_layers = 3;
342  cfg.ts_periodicity = 4;
343  cfg.ts_rate_decimator[0] = 4;
344  cfg.ts_rate_decimator[1] = 2;
345  cfg.ts_rate_decimator[2] = 1;
346  memcpy(cfg.ts_layer_id, ids, sizeof(ids));
347 
348  flag_periodicity = cfg.ts_periodicity;
349 
350  /* 0=L, 1=GF, 2=ARF, Intra-layer prediction enabled in layer 1,
351  * disabled in layer 2
352  */
353  layer_flags[0] = VPX_EFLAG_FORCE_KF |
356  layer_flags[2] = VP8_EFLAG_NO_REF_ARF |
358  layer_flags[1] =
359  layer_flags[3] = VP8_EFLAG_NO_REF_ARF |
362  break;
363  }
364 
365  case 6:
366  {
367  /* 3-layers, 4-frame period */
368  int ids[4] = {0,2,1,2};
369  cfg.ts_number_layers = 3;
370  cfg.ts_periodicity = 4;
371  cfg.ts_rate_decimator[0] = 4;
372  cfg.ts_rate_decimator[1] = 2;
373  cfg.ts_rate_decimator[2] = 1;
374  memcpy(cfg.ts_layer_id, ids, sizeof(ids));
375 
376  flag_periodicity = cfg.ts_periodicity;
377 
378  /* 0=L, 1=GF, 2=ARF, Intra-layer prediction enabled */
379  layer_flags[0] = VPX_EFLAG_FORCE_KF |
382  layer_flags[2] = VP8_EFLAG_NO_REF_ARF |
384  layer_flags[1] =
385  layer_flags[3] = VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF;
386  break;
387  }
388 
389  case 7:
390  {
391  /* NOTE: Probably of academic interest only */
392 
393  /* 5-layers, 16-frame period */
394  int ids[16] = {0,4,3,4,2,4,3,4,1,4,3,4,2,4,3,4};
395  cfg.ts_number_layers = 5;
396  cfg.ts_periodicity = 16;
397  cfg.ts_rate_decimator[0] = 16;
398  cfg.ts_rate_decimator[1] = 8;
399  cfg.ts_rate_decimator[2] = 4;
400  cfg.ts_rate_decimator[3] = 2;
401  cfg.ts_rate_decimator[4] = 1;
402  memcpy(cfg.ts_layer_id, ids, sizeof(ids));
403 
404  flag_periodicity = cfg.ts_periodicity;
405 
406  layer_flags[0] = VPX_EFLAG_FORCE_KF;
407  layer_flags[1] =
408  layer_flags[3] =
409  layer_flags[5] =
410  layer_flags[7] =
411  layer_flags[9] =
412  layer_flags[11] =
413  layer_flags[13] =
414  layer_flags[15] = VP8_EFLAG_NO_UPD_LAST |
417  layer_flags[2] =
418  layer_flags[6] =
419  layer_flags[10] =
420  layer_flags[14] = VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_GF;
421  layer_flags[4] =
422  layer_flags[12] = VP8_EFLAG_NO_REF_LAST |
424  layer_flags[8] = VP8_EFLAG_NO_REF_LAST | VP8_EFLAG_NO_REF_GF;
425  break;
426  }
427 
428  case 8:
429  {
430  /* 2-layers, with sync point at first frame of layer 1. */
431  int ids[2] = {0,1};
432  cfg.ts_number_layers = 2;
433  cfg.ts_periodicity = 2;
434  cfg.ts_rate_decimator[0] = 2;
435  cfg.ts_rate_decimator[1] = 1;
436  memcpy(cfg.ts_layer_id, ids, sizeof(ids));
437 
438  flag_periodicity = 8;
439 
440  /* 0=L, 1=GF */
441  // ARF is used as predictor for all frames, and is only updated on
442  // key frame. Sync point every 8 frames.
443 
444  // Layer 0: predict from L and ARF, update L and G.
445  layer_flags[0] = VPX_EFLAG_FORCE_KF |
448 
449  // Layer 1: sync point: predict from L and ARF, and update G.
450  layer_flags[1] = VP8_EFLAG_NO_REF_GF |
453 
454  // Layer 0, predict from L and ARF, update L.
455  layer_flags[2] = VP8_EFLAG_NO_REF_GF |
458 
459  // Layer 1: predict from L, G and ARF, and update G.
460  layer_flags[3] = VP8_EFLAG_NO_UPD_ARF |
463 
464  // Layer 0
465  layer_flags[4] = layer_flags[2];
466 
467  // Layer 1
468  layer_flags[5] = layer_flags[3];
469 
470  // Layer 0
471  layer_flags[6] = layer_flags[4];
472 
473  // Layer 1
474  layer_flags[7] = layer_flags[5];
475  break;
476  }
477 
478  case 9:
479  {
480  /* 3-layers */
481  // Sync points for layer 1 and 2 every 8 frames.
482 
483  int ids[4] = {0,2,1,2};
484  cfg.ts_number_layers = 3;
485  cfg.ts_periodicity = 4;
486  cfg.ts_rate_decimator[0] = 4;
487  cfg.ts_rate_decimator[1] = 2;
488  cfg.ts_rate_decimator[2] = 1;
489  memcpy(cfg.ts_layer_id, ids, sizeof(ids));
490 
491  flag_periodicity = 8;
492 
493  /* 0=L, 1=GF, 2=ARF */
494  layer_flags[0] = VPX_EFLAG_FORCE_KF |
497  layer_flags[1] = VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
499  layer_flags[2] = VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
501  layer_flags[3] =
502  layer_flags[5] = VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF;
503  layer_flags[4] = VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
505  layer_flags[6] = VP8_EFLAG_NO_REF_ARF |
507  layer_flags[7] = VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF |
510  break;
511  }
512  case 10:
513  {
514  // 3-layers structure where ARF is used as predictor for all frames,
515  // and is only updated on key frame.
516  // Sync points for layer 1 and 2 every 8 frames.
517 
518  int ids[4] = {0,2,1,2};
519  cfg.ts_number_layers = 3;
520  cfg.ts_periodicity = 4;
521  cfg.ts_rate_decimator[0] = 4;
522  cfg.ts_rate_decimator[1] = 2;
523  cfg.ts_rate_decimator[2] = 1;
524  memcpy(cfg.ts_layer_id, ids, sizeof(ids));
525 
526  flag_periodicity = 8;
527 
528  /* 0=L, 1=GF, 2=ARF */
529 
530  // Layer 0: predict from L and ARF; update L and G.
531  layer_flags[0] = VPX_EFLAG_FORCE_KF |
534 
535  // Layer 2: sync point: predict from L and ARF; update none.
536  layer_flags[1] = VP8_EFLAG_NO_REF_GF |
541 
542  // Layer 1: sync point: predict from L and ARF; update G.
543  layer_flags[2] = VP8_EFLAG_NO_REF_GF |
546 
547  // Layer 2: predict from L, G, ARF; update none.
548  layer_flags[3] = VP8_EFLAG_NO_UPD_GF |
552 
553  // Layer 0: predict from L and ARF; update L.
554  layer_flags[4] = VP8_EFLAG_NO_UPD_GF |
557 
558  // Layer 2: predict from L, G, ARF; update none.
559  layer_flags[5] = layer_flags[3];
560 
561  // Layer 1: predict from L, G, ARF; update G.
562  layer_flags[6] = VP8_EFLAG_NO_UPD_ARF |
564 
565  // Layer 2: predict from L, G, ARF; update none.
566  layer_flags[7] = layer_flags[3];
567  break;
568  }
569  case 11:
570  default:
571  {
572  // 3-layers structure as in case 10, but no sync/refresh points for
573  // layer 1 and 2.
574 
575  int ids[4] = {0,2,1,2};
576  cfg.ts_number_layers = 3;
577  cfg.ts_periodicity = 4;
578  cfg.ts_rate_decimator[0] = 4;
579  cfg.ts_rate_decimator[1] = 2;
580  cfg.ts_rate_decimator[2] = 1;
581  memcpy(cfg.ts_layer_id, ids, sizeof(ids));
582 
583  flag_periodicity = 8;
584 
585  /* 0=L, 1=GF, 2=ARF */
586 
587  // Layer 0: predict from L and ARF; update L.
588  layer_flags[0] = VP8_EFLAG_NO_UPD_GF |
591  layer_flags[4] = layer_flags[0];
592 
593  // Layer 1: predict from L, G, ARF; update G.
594  layer_flags[2] = VP8_EFLAG_NO_UPD_ARF |
596  layer_flags[6] = layer_flags[2];
597 
598  // Layer 2: predict from L, G, ARF; update none.
599  layer_flags[1] = VP8_EFLAG_NO_UPD_GF |
603  layer_flags[3] = layer_flags[1];
604  layer_flags[5] = layer_flags[1];
605  layer_flags[7] = layer_flags[1];
606  break;
607  }
608  }
609 
610  /* Open input file */
611  if(!(infile = fopen(argv[1], "rb")))
612  die("Failed to open %s for reading", argv[1]);
613 
614  /* Open an output file for each stream */
615  for (i=0; i<cfg.ts_number_layers; i++)
616  {
617  char file_name[512];
618  sprintf (file_name, "%s_%d.ivf", argv[2], i);
619  if (!(outfile[i] = fopen(file_name, "wb")))
620  die("Failed to open %s for writing", file_name);
621  write_ivf_file_header(outfile[i], &cfg, 0);
622  }
623 
624  /* Initialize codec */
625  if (vpx_codec_enc_init (&codec, interface, &cfg, 0))
626  die_codec (&codec, "Failed to initialize encoder");
627 
628  /* Cap CPU & first I-frame size */
629  vpx_codec_control (&codec, VP8E_SET_CPUUSED, -6);
633 
634  max_intra_size_pct = (int) (((double)cfg.rc_buf_optimal_sz * 0.5)
635  * ((double) cfg.g_timebase.den / cfg.g_timebase.num)
636  / 10.0);
637  /* printf ("max_intra_size_pct=%d\n", max_intra_size_pct); */
638 
640  max_intra_size_pct);
641 
642  frame_avail = 1;
643  while (frame_avail || got_data) {
644  vpx_codec_iter_t iter = NULL;
645  const vpx_codec_cx_pkt_t *pkt;
646 
647  flags = layer_flags[frame_cnt % flag_periodicity];
648 
649  frame_avail = read_frame(infile, &raw);
650  if (vpx_codec_encode(&codec, frame_avail? &raw : NULL, pts,
651  1, flags, VPX_DL_REALTIME))
652  die_codec(&codec, "Failed to encode frame");
653 
654  /* Reset KF flag */
655  if (layering_mode != 7)
656  layer_flags[0] &= ~VPX_EFLAG_FORCE_KF;
657 
658  got_data = 0;
659  while ( (pkt = vpx_codec_get_cx_data(&codec, &iter)) ) {
660  got_data = 1;
661  switch (pkt->kind) {
663  for (i=cfg.ts_layer_id[frame_cnt % cfg.ts_periodicity];
664  i<cfg.ts_number_layers; i++)
665  {
666  write_ivf_frame_header(outfile[i], pkt);
667  (void) fwrite(pkt->data.frame.buf, 1, pkt->data.frame.sz,
668  outfile[i]);
669  frames_in_layer[i]++;
670  }
671  break;
672  default:
673  break;
674  }
675  }
676  frame_cnt++;
677  pts += frame_duration;
678  }
679  fclose (infile);
680 
681  printf ("Processed %d frames.\n",frame_cnt-1);
682  if (vpx_codec_destroy(&codec))
683  die_codec (&codec, "Failed to destroy codec");
684 
685  /* Try to rewrite the output file headers with the actual frame count */
686  for (i=0; i<cfg.ts_number_layers; i++)
687  {
688  if (!fseek(outfile[i], 0, SEEK_SET))
689  write_ivf_file_header (outfile[i], &cfg, frames_in_layer[i]);
690  fclose (outfile[i]);
691  }
692 
693  return EXIT_SUCCESS;
694 }