FFmpeg
qsv_transcode.c
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1 /*
2  * Permission is hereby granted, free of charge, to any person obtaining a copy
3  * of this software and associated documentation files (the "Software"), to deal
4  * in the Software without restriction, including without limitation the rights
5  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
6  * copies of the Software, and to permit persons to whom the Software is
7  * furnished to do so, subject to the following conditions:
8  *
9  * The above copyright notice and this permission notice shall be included in
10  * all copies or substantial portions of the Software.
11  *
12  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
15  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
16  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
17  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
18  * THE SOFTWARE.
19  */
20 
21 /**
22  * @file Intel QSV-accelerated video transcoding API usage example
23  * @example qsv_transcode.c
24  *
25  * Perform QSV-accelerated transcoding and show to dynamically change
26  * encoder's options.
27  *
28  * Usage: qsv_transcode input_stream codec output_stream initial option
29  * { frame_number new_option }
30  * e.g: - qsv_transcode input.mp4 h264_qsv output_h264.mp4 "g 60"
31  * - qsv_transcode input.mp4 hevc_qsv output_hevc.mp4 "g 60 async_depth 1"
32  * 100 "g 120"
33  * (initialize codec with gop_size 60 and change it to 120 after 100
34  * frames)
35  */
36 
37 #include <stdio.h>
38 #include <errno.h>
39 
40 #include <libavutil/hwcontext.h>
41 #include <libavcodec/avcodec.h>
42 #include <libavformat/avformat.h>
43 #include <libavutil/opt.h>
44 
48 static int video_stream = -1;
49 
50 typedef struct DynamicSetting {
52  char* optstr;
55 static int setting_number;
57 
58 static int str_to_dict(char* optstr, AVDictionary **opt)
59 {
60  char *key, *value;
61  if (strlen(optstr) == 0)
62  return 0;
63  key = strtok(optstr, " ");
64  if (key == NULL)
65  return AVERROR(EINVAL);
66  value = strtok(NULL, " ");
67  if (value == NULL)
68  return AVERROR(EINVAL);
69  av_dict_set(opt, key, value, 0);
70  do {
71  key = strtok(NULL, " ");
72  if (key == NULL)
73  return 0;
74  value = strtok(NULL, " ");
75  if (value == NULL)
76  return AVERROR(EINVAL);
77  av_dict_set(opt, key, value, 0);
78  } while(key != NULL);
79  return 0;
80 }
81 
83 {
85  int ret = 0;
86  static int frame_number = 0;
87  frame_number++;
89  frame_number == dynamic_setting[current_setting_number].frame_number) {
92  if (ret < 0) {
93  fprintf(stderr, "The dynamic parameter is wrong\n");
94  goto fail;
95  }
96  /* Set common option. The dictionary will be freed and replaced
97  * by a new one containing all options not found in common option list.
98  * Then this new dictionary is used to set private option. */
99  if ((ret = av_opt_set_dict(avctx, &opts)) < 0)
100  goto fail;
101  /* Set codec specific option */
102  if ((ret = av_opt_set_dict(avctx->priv_data, &opts)) < 0)
103  goto fail;
104  /* There is no "framerate" option in commom option list. Use "-r" to set
105  * framerate, which is compatible with ffmpeg commandline. The video is
106  * assumed to be average frame rate, so set time_base to 1/framerate. */
107  e = av_dict_get(opts, "r", NULL, 0);
108  if (e) {
109  avctx->framerate = av_d2q(atof(e->value), INT_MAX);
111  }
112  }
113 fail:
114  av_dict_free(&opts);
115  return ret;
116 }
117 
118 static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)
119 {
120  while (*pix_fmts != AV_PIX_FMT_NONE) {
121  if (*pix_fmts == AV_PIX_FMT_QSV) {
122  return AV_PIX_FMT_QSV;
123  }
124 
125  pix_fmts++;
126  }
127 
128  fprintf(stderr, "The QSV pixel format not offered in get_format()\n");
129 
130  return AV_PIX_FMT_NONE;
131 }
132 
133 static int open_input_file(char *filename)
134 {
135  int ret;
136  const AVCodec *decoder = NULL;
137  AVStream *video = NULL;
138 
139  if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {
140  fprintf(stderr, "Cannot open input file '%s', Error code: %s\n",
141  filename, av_err2str(ret));
142  return ret;
143  }
144 
145  if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
146  fprintf(stderr, "Cannot find input stream information. Error code: %s\n",
147  av_err2str(ret));
148  return ret;
149  }
150 
152  if (ret < 0) {
153  fprintf(stderr, "Cannot find a video stream in the input file. "
154  "Error code: %s\n", av_err2str(ret));
155  return ret;
156  }
157  video_stream = ret;
159 
160  switch(video->codecpar->codec_id) {
161  case AV_CODEC_ID_H264:
163  break;
164  case AV_CODEC_ID_HEVC:
166  break;
167  case AV_CODEC_ID_VP9:
169  break;
170  case AV_CODEC_ID_VP8:
172  break;
173  case AV_CODEC_ID_AV1:
175  break;
177  decoder = avcodec_find_decoder_by_name("mpeg2_qsv");
178  break;
179  case AV_CODEC_ID_MJPEG:
180  decoder = avcodec_find_decoder_by_name("mjpeg_qsv");
181  break;
182  default:
183  fprintf(stderr, "Codec is not supportted by qsv\n");
184  return AVERROR(EINVAL);
185  }
186 
188  return AVERROR(ENOMEM);
189 
190  if ((ret = avcodec_parameters_to_context(decoder_ctx, video->codecpar)) < 0) {
191  fprintf(stderr, "avcodec_parameters_to_context error. Error code: %s\n",
192  av_err2str(ret));
193  return ret;
194  }
196 
198  if (!decoder_ctx->hw_device_ctx) {
199  fprintf(stderr, "A hardware device reference create failed.\n");
200  return AVERROR(ENOMEM);
201  }
203  decoder_ctx->pkt_timebase = video->time_base;
204  if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0)
205  fprintf(stderr, "Failed to open codec for decoding. Error code: %s\n",
206  av_err2str(ret));
207 
208  return ret;
209 }
210 
211 static int encode_write(AVPacket *enc_pkt, AVFrame *frame)
212 {
213  int ret = 0;
214 
215  av_packet_unref(enc_pkt);
216 
217  if((ret = dynamic_set_parameter(encoder_ctx)) < 0) {
218  fprintf(stderr, "Failed to set dynamic parameter. Error code: %s\n",
219  av_err2str(ret));
220  goto end;
221  }
222 
223  if ((ret = avcodec_send_frame(encoder_ctx, frame)) < 0) {
224  fprintf(stderr, "Error during encoding. Error code: %s\n", av_err2str(ret));
225  goto end;
226  }
227  while (1) {
228  if (ret = avcodec_receive_packet(encoder_ctx, enc_pkt))
229  break;
230  enc_pkt->stream_index = 0;
232  ofmt_ctx->streams[0]->time_base);
233  if ((ret = av_interleaved_write_frame(ofmt_ctx, enc_pkt)) < 0) {
234  fprintf(stderr, "Error during writing data to output file. "
235  "Error code: %s\n", av_err2str(ret));
236  return ret;
237  }
238  }
239 
240 end:
241  if (ret == AVERROR_EOF)
242  return 0;
243  ret = ((ret == AVERROR(EAGAIN)) ? 0:-1);
244  return ret;
245 }
246 
247 static int dec_enc(AVPacket *pkt, const AVCodec *enc_codec, char *optstr)
248 {
249  AVFrame *frame;
250  int ret = 0;
251 
253  if (ret < 0) {
254  fprintf(stderr, "Error during decoding. Error code: %s\n", av_err2str(ret));
255  return ret;
256  }
257 
258  while (ret >= 0) {
259  if (!(frame = av_frame_alloc()))
260  return AVERROR(ENOMEM);
261 
263  if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
265  return 0;
266  } else if (ret < 0) {
267  fprintf(stderr, "Error while decoding. Error code: %s\n", av_err2str(ret));
268  goto fail;
269  }
270  if (!encoder_ctx->hw_frames_ctx) {
271  AVDictionaryEntry *e = NULL;
273  AVStream *ost;
274  /* we need to ref hw_frames_ctx of decoder to initialize encoder's codec.
275  Only after we get a decoded frame, can we obtain its hw_frames_ctx */
277  if (!encoder_ctx->hw_frames_ctx) {
278  ret = AVERROR(ENOMEM);
279  goto fail;
280  }
281  /* set AVCodecContext Parameters for encoder, here we keep them stay
282  * the same as decoder.
283  */
288  if ((ret = str_to_dict(optstr, &opts)) < 0) {
289  fprintf(stderr, "Failed to set encoding parameter.\n");
290  goto fail;
291  }
292  /* There is no "framerate" option in commom option list. Use "-r" to
293  * set framerate, which is compatible with ffmpeg commandline. The
294  * video is assumed to be average frame rate, so set time_base to
295  * 1/framerate. */
296  e = av_dict_get(opts, "r", NULL, 0);
297  if (e) {
298  encoder_ctx->framerate = av_d2q(atof(e->value), INT_MAX);
300  }
301  if ((ret = avcodec_open2(encoder_ctx, enc_codec, &opts)) < 0) {
302  fprintf(stderr, "Failed to open encode codec. Error code: %s\n",
303  av_err2str(ret));
304  av_dict_free(&opts);
305  goto fail;
306  }
307  av_dict_free(&opts);
308 
309  if (!(ost = avformat_new_stream(ofmt_ctx, enc_codec))) {
310  fprintf(stderr, "Failed to allocate stream for output format.\n");
311  ret = AVERROR(ENOMEM);
312  goto fail;
313  }
314 
317  if (ret < 0) {
318  fprintf(stderr, "Failed to copy the stream parameters. "
319  "Error code: %s\n", av_err2str(ret));
320  goto fail;
321  }
322 
323  /* write the stream header */
324  if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) {
325  fprintf(stderr, "Error while writing stream header. "
326  "Error code: %s\n", av_err2str(ret));
327  goto fail;
328  }
329  }
332  if ((ret = encode_write(pkt, frame)) < 0)
333  fprintf(stderr, "Error during encoding and writing.\n");
334 
335 fail:
337  if (ret < 0)
338  return ret;
339  }
340  return 0;
341 }
342 
343 int main(int argc, char **argv)
344 {
345  const AVCodec *enc_codec;
346  int ret = 0;
347  AVPacket *dec_pkt;
348 
349  if (argc < 5 || (argc - 5) % 2) {
350  av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <encoder> <output file>"
351  " <\"encoding option set 0\"> [<frame_number> <\"encoding options set 1\">]...\n", argv[0]);
352  return 1;
353  }
354  setting_number = (argc - 5) / 2;
357  for (int i = 0; i < setting_number; i++) {
358  dynamic_setting[i].frame_number = atoi(argv[i*2 + 5]);
359  dynamic_setting[i].optstr = argv[i*2 + 6];
360  }
361 
363  if (ret < 0) {
364  fprintf(stderr, "Failed to create a QSV device. Error code: %s\n", av_err2str(ret));
365  goto end;
366  }
367 
368  dec_pkt = av_packet_alloc();
369  if (!dec_pkt) {
370  fprintf(stderr, "Failed to allocate decode packet\n");
371  goto end;
372  }
373 
374  if ((ret = open_input_file(argv[1])) < 0)
375  goto end;
376 
377  if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) {
378  fprintf(stderr, "Could not find encoder '%s'\n", argv[2]);
379  ret = -1;
380  goto end;
381  }
382 
383  if ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, argv[3]))) < 0) {
384  fprintf(stderr, "Failed to deduce output format from file extension. Error code: "
385  "%s\n", av_err2str(ret));
386  goto end;
387  }
388 
389  if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) {
390  ret = AVERROR(ENOMEM);
391  goto end;
392  }
393 
394  ret = avio_open(&ofmt_ctx->pb, argv[3], AVIO_FLAG_WRITE);
395  if (ret < 0) {
396  fprintf(stderr, "Cannot open output file. "
397  "Error code: %s\n", av_err2str(ret));
398  goto end;
399  }
400 
401  /* read all packets and only transcoding video */
402  while (ret >= 0) {
403  if ((ret = av_read_frame(ifmt_ctx, dec_pkt)) < 0)
404  break;
405 
406  if (video_stream == dec_pkt->stream_index)
407  ret = dec_enc(dec_pkt, enc_codec, argv[4]);
408 
409  av_packet_unref(dec_pkt);
410  }
411 
412  /* flush decoder */
413  av_packet_unref(dec_pkt);
414  if ((ret = dec_enc(dec_pkt, enc_codec, argv[4])) < 0) {
415  fprintf(stderr, "Failed to flush decoder %s\n", av_err2str(ret));
416  goto end;
417  }
418 
419  /* flush encoder */
420  if ((ret = encode_write(dec_pkt, NULL)) < 0) {
421  fprintf(stderr, "Failed to flush encoder %s\n", av_err2str(ret));
422  goto end;
423  }
424 
425  /* write the trailer for output stream */
426  if ((ret = av_write_trailer(ofmt_ctx)) < 0)
427  fprintf(stderr, "Failed to write trailer %s\n", av_err2str(ret));
428 
429 end:
435  av_packet_free(&dec_pkt);
437  return ret;
438 }
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:427
AVCodec
AVCodec.
Definition: codec.h:187
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:71
avcodec_receive_packet
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
Read encoded data from the encoder.
Definition: encode.c:556
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
AVCodecContext::get_format
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
Callback to negotiate the pixel format.
Definition: avcodec.h:716
av_find_best_stream
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, const AVCodec **decoder_ret, int flags)
Definition: avformat.c:433
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
get_format
static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)
Definition: qsv_transcode.c:118
DynamicSetting::optstr
char * optstr
Definition: qsv_transcode.c:52
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:100
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1431
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:452
AVDictionary
Definition: dict.c:34
av_buffer_ref
AVBufferRef * av_buffer_ref(const AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:103
av_read_frame
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: demux.c:1558
ost
static AVStream * ost
Definition: vaapi_transcode.c:42
av_packet_free
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:74
DynamicSetting
Definition: qsv_transcode.c:50
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
setting_number
static int setting_number
Definition: qsv_transcode.c:55
AVCodecContext::framerate
AVRational framerate
Definition: avcodec.h:1807
avformat_close_input
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: demux.c:374
dec_enc
static int dec_enc(AVPacket *pkt, const AVCodec *enc_codec, char *optstr)
Definition: qsv_transcode.c:247
decoder
static const chunk_decoder decoder[8]
Definition: dfa.c:331
fail
#define fail()
Definition: checkasm.h:179
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:88
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
avformat_open_input
int avformat_open_input(AVFormatContext **ps, const char *url, const AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: demux.c:226
av_dict_get
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:62
av_opt_set_dict
int av_opt_set_dict(void *obj, AVDictionary **options)
Set all the options from a given dictionary on an object.
Definition: opt.c:1777
ofmt_ctx
static AVFormatContext * ofmt_ctx
Definition: qsv_transcode.c:45
avcodec_alloc_context3
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:154
AV_CODEC_ID_VP9
@ AV_CODEC_ID_VP9
Definition: codec_id.h:220
avcodec_receive_frame
int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder or encoder (when the AV_CODEC_FLAG_RECON_FRAME flag is used...
Definition: avcodec.c:715
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:304
AVIO_FLAG_WRITE
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:637
av_rescale_q
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
key
const char * key
Definition: hwcontext_opencl.c:174
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:79
avformat_write_header
av_warn_unused_result int avformat_write_header(AVFormatContext *s, AVDictionary **options)
Allocate the stream private data and write the stream header to an output media file.
Definition: mux.c:472
frame
static AVFrame * frame
Definition: demux_decode.c:54
AVFormatContext
Format I/O context.
Definition: avformat.h:1363
opts
AVDictionary * opts
Definition: movenc.c:50
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:864
avcodec_parameters_to_context
int avcodec_parameters_to_context(AVCodecContext *codec, const struct AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
dynamic_set_parameter
static int dynamic_set_parameter(AVCodecContext *avctx)
Definition: qsv_transcode.c:82
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:880
NULL
#define NULL
Definition: coverity.c:32
avcodec_find_decoder_by_name
const AVCodec * avcodec_find_decoder_by_name(const char *name)
Find a registered decoder with the specified name.
Definition: allcodecs.c:1009
av_buffer_unref
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it.
Definition: buffer.c:139
AV_CODEC_ID_AV1
@ AV_CODEC_ID_AV1
Definition: codec_id.h:283
avcodec_free_context
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer.
Definition: options.c:169
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1405
avcodec_open2
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: avcodec.c:128
open_input_file
static int open_input_file(char *filename)
Definition: qsv_transcode.c:133
AV_PIX_FMT_QSV
@ AV_PIX_FMT_QSV
HW acceleration through QSV, data[3] contains a pointer to the mfxFrameSurface1 structure.
Definition: pixfmt.h:247
dynamic_setting
static DynamicSetting * dynamic_setting
Definition: qsv_transcode.c:54
AVCodecContext::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avcodec.h:567
current_setting_number
static int current_setting_number
Definition: qsv_transcode.c:56
avformat_find_stream_info
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: demux.c:2532
main
int main(int argc, char **argv)
Definition: qsv_transcode.c:343
ifmt_ctx
static AVFormatContext * ifmt_ctx
Definition: qsv_transcode.c:45
av_err2str
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:121
AVCodecContext::pkt_timebase
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are expressed.
Definition: avcodec.h:1821
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:63
av_dict_free
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values.
Definition: dict.c:225
encode_write
static int encode_write(AVPacket *enc_pkt, AVFrame *frame)
Definition: qsv_transcode.c:211
av_packet_rescale_ts
void av_packet_rescale_ts(AVPacket *pkt, AVRational src_tb, AVRational dst_tb)
Convert valid timing fields (timestamps / durations) in a packet from one timebase to another.
Definition: avpacket.c:531
AV_CODEC_ID_MJPEG
@ AV_CODEC_ID_MJPEG
Definition: codec_id.h:59
avcodec_send_packet
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:709
av_write_trailer
int av_write_trailer(AVFormatContext *s)
Write the stream trailer to an output media file and free the file private data.
Definition: mux.c:1286
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
video_stream
static int video_stream
Definition: qsv_transcode.c:48
encoder_ctx
static AVCodecContext * encoder_ctx
Definition: qsv_transcode.c:47
AV_CODEC_ID_HEVC
@ AV_CODEC_ID_HEVC
Definition: codec_id.h:226
value
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value
Definition: writing_filters.txt:86
av_d2q
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
AVCodecContext::hw_device_ctx
AVBufferRef * hw_device_ctx
A reference to the AVHWDeviceContext describing the device which will be used by a hardware encoder/d...
Definition: avcodec.h:1985
AVCodecContext::height
int height
Definition: avcodec.h:625
avcodec_send_frame
int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame)
Supply a raw video or audio frame to the encoder.
Definition: encode.c:518
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:662
AVCodecContext::hw_frames_ctx
AVBufferRef * hw_frames_ctx
A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames.
Definition: avcodec.h:1944
avcodec.h
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:841
av_guess_frame_rate
AVRational av_guess_frame_rate(AVFormatContext *format, AVStream *st, AVFrame *frame)
Guess the frame rate, based on both the container and codec information.
Definition: avformat.c:740
av_hwdevice_ctx_create
int av_hwdevice_ctx_create(AVBufferRef **pdevice_ref, enum AVHWDeviceType type, const char *device, AVDictionary *opts, int flags)
Open a device of the specified type and create an AVHWDeviceContext for it.
Definition: hwcontext.c:618
avformat.h
AV_HWDEVICE_TYPE_QSV
@ AV_HWDEVICE_TYPE_QSV
Definition: hwcontext.h:33
AVCodecContext
main external API structure.
Definition: avcodec.h:445
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:72
video
A Quick Description Of Rate Distortion Theory We want to encode a video
Definition: rate_distortion.txt:3
avio_open
int avio_open(AVIOContext **s, const char *url, int flags)
Create and initialize a AVIOContext for accessing the resource indicated by url.
Definition: aviobuf.c:1303
AVPacket::stream_index
int stream_index
Definition: packet.h:524
DynamicSetting::frame_number
int frame_number
Definition: qsv_transcode.c:51
str_to_dict
static int str_to_dict(char *optstr, AVDictionary **opt)
Definition: qsv_transcode.c:58
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
avcodec_parameters_from_context
int avcodec_parameters_from_context(struct AVCodecParameters *par, const AVCodecContext *codec)
Fill the parameters struct based on the values from the supplied codec context.
Definition: codec_par.c:137
AVDictionaryEntry
Definition: dict.h:89
AVPacket
This structure stores compressed data.
Definition: packet.h:499
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
av_interleaved_write_frame
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file ensuring correct interleaving.
Definition: mux.c:1271
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
av_dict_set
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:88
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:625
AV_CODEC_ID_VP8
@ AV_CODEC_ID_VP8
Definition: codec_id.h:192
hwcontext.h
decoder_ctx
static AVCodecContext * decoder_ctx
Definition: qsv_transcode.c:47
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVDictionaryEntry::value
char * value
Definition: dict.h:91
avformat_alloc_output_context2
int avformat_alloc_output_context2(AVFormatContext **ctx, const AVOutputFormat *oformat, const char *format_name, const char *filename)
Allocate an AVFormatContext for an output format.
Definition: mux.c:93
AV_CODEC_ID_MPEG2VIDEO
@ AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:54
hw_device_ctx
static AVBufferRef * hw_device_ctx
Definition: qsv_transcode.c:46
avcodec_find_encoder_by_name
const AVCodec * avcodec_find_encoder_by_name(const char *name)
Find a registered encoder with the specified name.
Definition: allcodecs.c:1004