1 /*
2 * Copyright (c) 2010 Nicolas George
3 * Copyright (c) 2011 Stefano Sabatini
4 * Copyright (c) 2014 Andrey Utkin
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 /**
26 * @file
27 * API example for demuxing, decoding, filtering, encoding and muxing
28 * @example transcoding.c
29 */
30
31 #include <libavcodec/avcodec.h>
32 #include <libavformat/avformat.h>
33 #include <libavfilter/buffersink.h>
34 #include <libavfilter/buffersrc.h>
35 #include <libavutil/opt.h>
36 #include <libavutil/pixdesc.h>
37
38 static AVFormatContext *ifmt_ctx;
39 static AVFormatContext *ofmt_ctx;
40 typedef struct FilteringContext {
41 AVFilterContext *buffersink_ctx;
42 AVFilterContext *buffersrc_ctx;
43 AVFilterGraph *filter_graph;
44
45 AVPacket *enc_pkt;
46 AVFrame *filtered_frame;
47 } FilteringContext;
48 static FilteringContext *filter_ctx;
49
50 typedef struct StreamContext {
51 AVCodecContext *dec_ctx;
52 AVCodecContext *enc_ctx;
53
54 AVFrame *dec_frame;
55 } StreamContext;
56 static StreamContext *stream_ctx;
57
open_input_file(const char * filename)58 static int open_input_file(const char *filename)
59 {
60 int ret;
61 unsigned int i;
62
63 ifmt_ctx = NULL;
64 if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {
65 av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n");
66 return ret;
67 }
68
69 if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
70 av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
71 return ret;
72 }
73
74 stream_ctx = av_mallocz_array(ifmt_ctx->nb_streams, sizeof(*stream_ctx));
75 if (!stream_ctx)
76 return AVERROR(ENOMEM);
77
78 for (i = 0; i < ifmt_ctx->nb_streams; i++) {
79 AVStream *stream = ifmt_ctx->streams[i];
80 AVCodec *dec = avcodec_find_decoder(stream->codecpar->codec_id);
81 AVCodecContext *codec_ctx;
82 if (!dec) {
83 av_log(NULL, AV_LOG_ERROR, "Failed to find decoder for stream #%u\n", i);
84 return AVERROR_DECODER_NOT_FOUND;
85 }
86 codec_ctx = avcodec_alloc_context3(dec);
87 if (!codec_ctx) {
88 av_log(NULL, AV_LOG_ERROR, "Failed to allocate the decoder context for stream #%u\n", i);
89 return AVERROR(ENOMEM);
90 }
91 ret = avcodec_parameters_to_context(codec_ctx, stream->codecpar);
92 if (ret < 0) {
93 av_log(NULL, AV_LOG_ERROR, "Failed to copy decoder parameters to input decoder context "
94 "for stream #%u\n", i);
95 return ret;
96 }
97 /* Reencode video & audio and remux subtitles etc. */
98 if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
99 || codec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
100 if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO)
101 codec_ctx->framerate = av_guess_frame_rate(ifmt_ctx, stream, NULL);
102 /* Open decoder */
103 ret = avcodec_open2(codec_ctx, dec, NULL);
104 if (ret < 0) {
105 av_log(NULL, AV_LOG_ERROR, "Failed to open decoder for stream #%u\n", i);
106 return ret;
107 }
108 }
109 stream_ctx[i].dec_ctx = codec_ctx;
110
111 stream_ctx[i].dec_frame = av_frame_alloc();
112 if (!stream_ctx[i].dec_frame)
113 return AVERROR(ENOMEM);
114 }
115
116 av_dump_format(ifmt_ctx, 0, filename, 0);
117 return 0;
118 }
119
open_output_file(const char * filename)120 static int open_output_file(const char *filename)
121 {
122 AVStream *out_stream;
123 AVStream *in_stream;
124 AVCodecContext *dec_ctx, *enc_ctx;
125 AVCodec *encoder;
126 int ret;
127 unsigned int i;
128
129 ofmt_ctx = NULL;
130 avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, filename);
131 if (!ofmt_ctx) {
132 av_log(NULL, AV_LOG_ERROR, "Could not create output context\n");
133 return AVERROR_UNKNOWN;
134 }
135
136
137 for (i = 0; i < ifmt_ctx->nb_streams; i++) {
138 out_stream = avformat_new_stream(ofmt_ctx, NULL);
139 if (!out_stream) {
140 av_log(NULL, AV_LOG_ERROR, "Failed allocating output stream\n");
141 return AVERROR_UNKNOWN;
142 }
143
144 in_stream = ifmt_ctx->streams[i];
145 dec_ctx = stream_ctx[i].dec_ctx;
146
147 if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
148 || dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
149 /* in this example, we choose transcoding to same codec */
150 encoder = avcodec_find_encoder(dec_ctx->codec_id);
151 if (!encoder) {
152 av_log(NULL, AV_LOG_FATAL, "Necessary encoder not found\n");
153 return AVERROR_INVALIDDATA;
154 }
155 enc_ctx = avcodec_alloc_context3(encoder);
156 if (!enc_ctx) {
157 av_log(NULL, AV_LOG_FATAL, "Failed to allocate the encoder context\n");
158 return AVERROR(ENOMEM);
159 }
160
161 /* In this example, we transcode to same properties (picture size,
162 * sample rate etc.). These properties can be changed for output
163 * streams easily using filters */
164 if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
165 enc_ctx->height = dec_ctx->height;
166 enc_ctx->width = dec_ctx->width;
167 enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio;
168 /* take first format from list of supported formats */
169 if (encoder->pix_fmts)
170 enc_ctx->pix_fmt = encoder->pix_fmts[0];
171 else
172 enc_ctx->pix_fmt = dec_ctx->pix_fmt;
173 /* video time_base can be set to whatever is handy and supported by encoder */
174 enc_ctx->time_base = av_inv_q(dec_ctx->framerate);
175 } else {
176 enc_ctx->sample_rate = dec_ctx->sample_rate;
177 enc_ctx->channel_layout = dec_ctx->channel_layout;
178 enc_ctx->channels = av_get_channel_layout_nb_channels(enc_ctx->channel_layout);
179 /* take first format from list of supported formats */
180 enc_ctx->sample_fmt = encoder->sample_fmts[0];
181 enc_ctx->time_base = (AVRational){1, enc_ctx->sample_rate};
182 }
183
184 if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
185 enc_ctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
186
187 /* Third parameter can be used to pass settings to encoder */
188 ret = avcodec_open2(enc_ctx, encoder, NULL);
189 if (ret < 0) {
190 av_log(NULL, AV_LOG_ERROR, "Cannot open video encoder for stream #%u\n", i);
191 return ret;
192 }
193 ret = avcodec_parameters_from_context(out_stream->codecpar, enc_ctx);
194 if (ret < 0) {
195 av_log(NULL, AV_LOG_ERROR, "Failed to copy encoder parameters to output stream #%u\n", i);
196 return ret;
197 }
198
199 out_stream->time_base = enc_ctx->time_base;
200 stream_ctx[i].enc_ctx = enc_ctx;
201 } else if (dec_ctx->codec_type == AVMEDIA_TYPE_UNKNOWN) {
202 av_log(NULL, AV_LOG_FATAL, "Elementary stream #%d is of unknown type, cannot proceed\n", i);
203 return AVERROR_INVALIDDATA;
204 } else {
205 /* if this stream must be remuxed */
206 ret = avcodec_parameters_copy(out_stream->codecpar, in_stream->codecpar);
207 if (ret < 0) {
208 av_log(NULL, AV_LOG_ERROR, "Copying parameters for stream #%u failed\n", i);
209 return ret;
210 }
211 out_stream->time_base = in_stream->time_base;
212 }
213
214 }
215 av_dump_format(ofmt_ctx, 0, filename, 1);
216
217 if (!(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) {
218 ret = avio_open(&ofmt_ctx->pb, filename, AVIO_FLAG_WRITE);
219 if (ret < 0) {
220 av_log(NULL, AV_LOG_ERROR, "Could not open output file '%s'", filename);
221 return ret;
222 }
223 }
224
225 /* init muxer, write output file header */
226 ret = avformat_write_header(ofmt_ctx, NULL);
227 if (ret < 0) {
228 av_log(NULL, AV_LOG_ERROR, "Error occurred when opening output file\n");
229 return ret;
230 }
231
232 return 0;
233 }
234
init_filter(FilteringContext * fctx,AVCodecContext * dec_ctx,AVCodecContext * enc_ctx,const char * filter_spec)235 static int init_filter(FilteringContext* fctx, AVCodecContext *dec_ctx,
236 AVCodecContext *enc_ctx, const char *filter_spec)
237 {
238 char args[512];
239 int ret = 0;
240 const AVFilter *buffersrc = NULL;
241 const AVFilter *buffersink = NULL;
242 AVFilterContext *buffersrc_ctx = NULL;
243 AVFilterContext *buffersink_ctx = NULL;
244 AVFilterInOut *outputs = avfilter_inout_alloc();
245 AVFilterInOut *inputs = avfilter_inout_alloc();
246 AVFilterGraph *filter_graph = avfilter_graph_alloc();
247
248 if (!outputs || !inputs || !filter_graph) {
249 ret = AVERROR(ENOMEM);
250 goto end;
251 }
252
253 if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
254 buffersrc = avfilter_get_by_name("buffer");
255 buffersink = avfilter_get_by_name("buffersink");
256 if (!buffersrc || !buffersink) {
257 av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
258 ret = AVERROR_UNKNOWN;
259 goto end;
260 }
261
262 snprintf(args, sizeof(args),
263 "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
264 dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt,
265 dec_ctx->time_base.num, dec_ctx->time_base.den,
266 dec_ctx->sample_aspect_ratio.num,
267 dec_ctx->sample_aspect_ratio.den);
268
269 ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
270 args, NULL, filter_graph);
271 if (ret < 0) {
272 av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n");
273 goto end;
274 }
275
276 ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
277 NULL, NULL, filter_graph);
278 if (ret < 0) {
279 av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n");
280 goto end;
281 }
282
283 ret = av_opt_set_bin(buffersink_ctx, "pix_fmts",
284 (uint8_t*)&enc_ctx->pix_fmt, sizeof(enc_ctx->pix_fmt),
285 AV_OPT_SEARCH_CHILDREN);
286 if (ret < 0) {
287 av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n");
288 goto end;
289 }
290 } else if (dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
291 buffersrc = avfilter_get_by_name("abuffer");
292 buffersink = avfilter_get_by_name("abuffersink");
293 if (!buffersrc || !buffersink) {
294 av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
295 ret = AVERROR_UNKNOWN;
296 goto end;
297 }
298
299 if (!dec_ctx->channel_layout)
300 dec_ctx->channel_layout =
301 av_get_default_channel_layout(dec_ctx->channels);
302 snprintf(args, sizeof(args),
303 "time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%"PRIx64,
304 dec_ctx->time_base.num, dec_ctx->time_base.den, dec_ctx->sample_rate,
305 av_get_sample_fmt_name(dec_ctx->sample_fmt),
306 dec_ctx->channel_layout);
307 ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
308 args, NULL, filter_graph);
309 if (ret < 0) {
310 av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer source\n");
311 goto end;
312 }
313
314 ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
315 NULL, NULL, filter_graph);
316 if (ret < 0) {
317 av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer sink\n");
318 goto end;
319 }
320
321 ret = av_opt_set_bin(buffersink_ctx, "sample_fmts",
322 (uint8_t*)&enc_ctx->sample_fmt, sizeof(enc_ctx->sample_fmt),
323 AV_OPT_SEARCH_CHILDREN);
324 if (ret < 0) {
325 av_log(NULL, AV_LOG_ERROR, "Cannot set output sample format\n");
326 goto end;
327 }
328
329 ret = av_opt_set_bin(buffersink_ctx, "channel_layouts",
330 (uint8_t*)&enc_ctx->channel_layout,
331 sizeof(enc_ctx->channel_layout), AV_OPT_SEARCH_CHILDREN);
332 if (ret < 0) {
333 av_log(NULL, AV_LOG_ERROR, "Cannot set output channel layout\n");
334 goto end;
335 }
336
337 ret = av_opt_set_bin(buffersink_ctx, "sample_rates",
338 (uint8_t*)&enc_ctx->sample_rate, sizeof(enc_ctx->sample_rate),
339 AV_OPT_SEARCH_CHILDREN);
340 if (ret < 0) {
341 av_log(NULL, AV_LOG_ERROR, "Cannot set output sample rate\n");
342 goto end;
343 }
344 } else {
345 ret = AVERROR_UNKNOWN;
346 goto end;
347 }
348
349 /* Endpoints for the filter graph. */
350 outputs->name = av_strdup("in");
351 outputs->filter_ctx = buffersrc_ctx;
352 outputs->pad_idx = 0;
353 outputs->next = NULL;
354
355 inputs->name = av_strdup("out");
356 inputs->filter_ctx = buffersink_ctx;
357 inputs->pad_idx = 0;
358 inputs->next = NULL;
359
360 if (!outputs->name || !inputs->name) {
361 ret = AVERROR(ENOMEM);
362 goto end;
363 }
364
365 if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec,
366 &inputs, &outputs, NULL)) < 0)
367 goto end;
368
369 if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
370 goto end;
371
372 /* Fill FilteringContext */
373 fctx->buffersrc_ctx = buffersrc_ctx;
374 fctx->buffersink_ctx = buffersink_ctx;
375 fctx->filter_graph = filter_graph;
376
377 end:
378 avfilter_inout_free(&inputs);
379 avfilter_inout_free(&outputs);
380
381 return ret;
382 }
383
init_filters(void)384 static int init_filters(void)
385 {
386 const char *filter_spec;
387 unsigned int i;
388 int ret;
389 filter_ctx = av_malloc_array(ifmt_ctx->nb_streams, sizeof(*filter_ctx));
390 if (!filter_ctx)
391 return AVERROR(ENOMEM);
392
393 for (i = 0; i < ifmt_ctx->nb_streams; i++) {
394 filter_ctx[i].buffersrc_ctx = NULL;
395 filter_ctx[i].buffersink_ctx = NULL;
396 filter_ctx[i].filter_graph = NULL;
397 if (!(ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
398 || ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO))
399 continue;
400
401
402 if (ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
403 filter_spec = "null"; /* passthrough (dummy) filter for video */
404 else
405 filter_spec = "anull"; /* passthrough (dummy) filter for audio */
406 ret = init_filter(&filter_ctx[i], stream_ctx[i].dec_ctx,
407 stream_ctx[i].enc_ctx, filter_spec);
408 if (ret)
409 return ret;
410
411 filter_ctx[i].enc_pkt = av_packet_alloc();
412 if (!filter_ctx[i].enc_pkt)
413 return AVERROR(ENOMEM);
414
415 filter_ctx[i].filtered_frame = av_frame_alloc();
416 if (!filter_ctx[i].filtered_frame)
417 return AVERROR(ENOMEM);
418 }
419 return 0;
420 }
421
encode_write_frame(unsigned int stream_index,int flush)422 static int encode_write_frame(unsigned int stream_index, int flush)
423 {
424 StreamContext *stream = &stream_ctx[stream_index];
425 FilteringContext *filter = &filter_ctx[stream_index];
426 AVFrame *filt_frame = flush ? NULL : filter->filtered_frame;
427 AVPacket *enc_pkt = filter->enc_pkt;
428 int ret;
429
430 av_log(NULL, AV_LOG_INFO, "Encoding frame\n");
431 /* encode filtered frame */
432 av_packet_unref(enc_pkt);
433
434 ret = avcodec_send_frame(stream->enc_ctx, filt_frame);
435
436 if (ret < 0)
437 return ret;
438
439 while (ret >= 0) {
440 ret = avcodec_receive_packet(stream->enc_ctx, enc_pkt);
441
442 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
443 return 0;
444
445 /* prepare packet for muxing */
446 enc_pkt->stream_index = stream_index;
447 av_packet_rescale_ts(enc_pkt,
448 stream->enc_ctx->time_base,
449 ofmt_ctx->streams[stream_index]->time_base);
450
451 av_log(NULL, AV_LOG_DEBUG, "Muxing frame\n");
452 /* mux encoded frame */
453 ret = av_interleaved_write_frame(ofmt_ctx, enc_pkt);
454 }
455
456 return ret;
457 }
458
filter_encode_write_frame(AVFrame * frame,unsigned int stream_index)459 static int filter_encode_write_frame(AVFrame *frame, unsigned int stream_index)
460 {
461 FilteringContext *filter = &filter_ctx[stream_index];
462 int ret;
463
464 av_log(NULL, AV_LOG_INFO, "Pushing decoded frame to filters\n");
465 /* push the decoded frame into the filtergraph */
466 ret = av_buffersrc_add_frame_flags(filter->buffersrc_ctx,
467 frame, 0);
468 if (ret < 0) {
469 av_log(NULL, AV_LOG_ERROR, "Error while feeding the filtergraph\n");
470 return ret;
471 }
472
473 /* pull filtered frames from the filtergraph */
474 while (1) {
475 av_log(NULL, AV_LOG_INFO, "Pulling filtered frame from filters\n");
476 ret = av_buffersink_get_frame(filter->buffersink_ctx,
477 filter->filtered_frame);
478 if (ret < 0) {
479 /* if no more frames for output - returns AVERROR(EAGAIN)
480 * if flushed and no more frames for output - returns AVERROR_EOF
481 * rewrite retcode to 0 to show it as normal procedure completion
482 */
483 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
484 ret = 0;
485 break;
486 }
487
488 filter->filtered_frame->pict_type = AV_PICTURE_TYPE_NONE;
489 ret = encode_write_frame(stream_index, 0);
490 av_frame_unref(filter->filtered_frame);
491 if (ret < 0)
492 break;
493 }
494
495 return ret;
496 }
497
flush_encoder(unsigned int stream_index)498 static int flush_encoder(unsigned int stream_index)
499 {
500 if (!(stream_ctx[stream_index].enc_ctx->codec->capabilities &
501 AV_CODEC_CAP_DELAY))
502 return 0;
503
504 av_log(NULL, AV_LOG_INFO, "Flushing stream #%u encoder\n", stream_index);
505 return encode_write_frame(stream_index, 1);
506 }
507
main(int argc,char ** argv)508 int main(int argc, char **argv)
509 {
510 int ret;
511 AVPacket *packet = NULL;
512 unsigned int stream_index;
513 unsigned int i;
514
515 if (argc != 3) {
516 av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <output file>\n", argv[0]);
517 return 1;
518 }
519
520 if ((ret = open_input_file(argv[1])) < 0)
521 goto end;
522 if ((ret = open_output_file(argv[2])) < 0)
523 goto end;
524 if ((ret = init_filters()) < 0)
525 goto end;
526 if (!(packet = av_packet_alloc()))
527 goto end;
528
529 /* read all packets */
530 while (1) {
531 if ((ret = av_read_frame(ifmt_ctx, packet)) < 0)
532 break;
533 stream_index = packet->stream_index;
534 av_log(NULL, AV_LOG_DEBUG, "Demuxer gave frame of stream_index %u\n",
535 stream_index);
536
537 if (filter_ctx[stream_index].filter_graph) {
538 StreamContext *stream = &stream_ctx[stream_index];
539
540 av_log(NULL, AV_LOG_DEBUG, "Going to reencode&filter the frame\n");
541
542 av_packet_rescale_ts(packet,
543 ifmt_ctx->streams[stream_index]->time_base,
544 stream->dec_ctx->time_base);
545 ret = avcodec_send_packet(stream->dec_ctx, packet);
546 if (ret < 0) {
547 av_log(NULL, AV_LOG_ERROR, "Decoding failed\n");
548 break;
549 }
550
551 while (ret >= 0) {
552 ret = avcodec_receive_frame(stream->dec_ctx, stream->dec_frame);
553 if (ret == AVERROR_EOF || ret == AVERROR(EAGAIN))
554 break;
555 else if (ret < 0)
556 goto end;
557
558 stream->dec_frame->pts = stream->dec_frame->best_effort_timestamp;
559 ret = filter_encode_write_frame(stream->dec_frame, stream_index);
560 if (ret < 0)
561 goto end;
562 }
563 } else {
564 /* remux this frame without reencoding */
565 av_packet_rescale_ts(packet,
566 ifmt_ctx->streams[stream_index]->time_base,
567 ofmt_ctx->streams[stream_index]->time_base);
568
569 ret = av_interleaved_write_frame(ofmt_ctx, packet);
570 if (ret < 0)
571 goto end;
572 }
573 av_packet_unref(packet);
574 }
575
576 /* flush filters and encoders */
577 for (i = 0; i < ifmt_ctx->nb_streams; i++) {
578 /* flush filter */
579 if (!filter_ctx[i].filter_graph)
580 continue;
581 ret = filter_encode_write_frame(NULL, i);
582 if (ret < 0) {
583 av_log(NULL, AV_LOG_ERROR, "Flushing filter failed\n");
584 goto end;
585 }
586
587 /* flush encoder */
588 ret = flush_encoder(i);
589 if (ret < 0) {
590 av_log(NULL, AV_LOG_ERROR, "Flushing encoder failed\n");
591 goto end;
592 }
593 }
594
595 av_write_trailer(ofmt_ctx);
596 end:
597 av_packet_free(&packet);
598 for (i = 0; i < ifmt_ctx->nb_streams; i++) {
599 avcodec_free_context(&stream_ctx[i].dec_ctx);
600 if (ofmt_ctx && ofmt_ctx->nb_streams > i && ofmt_ctx->streams[i] && stream_ctx[i].enc_ctx)
601 avcodec_free_context(&stream_ctx[i].enc_ctx);
602 if (filter_ctx && filter_ctx[i].filter_graph) {
603 avfilter_graph_free(&filter_ctx[i].filter_graph);
604 av_packet_free(&filter_ctx[i].enc_pkt);
605 av_frame_free(&filter_ctx[i].filtered_frame);
606 }
607
608 av_frame_free(&stream_ctx[i].dec_frame);
609 }
610 av_free(filter_ctx);
611 av_free(stream_ctx);
612 avformat_close_input(&ifmt_ctx);
613 if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE))
614 avio_closep(&ofmt_ctx->pb);
615 avformat_free_context(ofmt_ctx);
616
617 if (ret < 0)
618 av_log(NULL, AV_LOG_ERROR, "Error occurred: %s\n", av_err2str(ret));
619
620 return ret ? 1 : 0;
621 }
622