FFmpeg
qsv_transcode.c
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1 /*
2  * Quick Sync Video (video transcoding) transcode sample
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a copy
5  * of this software and associated documentation files (the "Software"), to deal
6  * in the Software without restriction, including without limitation the rights
7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8  * copies of the Software, and to permit persons to whom the Software is
9  * furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20  * THE SOFTWARE.
21  */
22 
23 /**
24  * @file
25  * Intel QSV-accelerated transcoding example.
26  *
27  * @example qsv_transcode.c
28  * This example shows how to do QSV-accelerated transcoding and how to
29  * dynamically change encoder's option.
30  * Usage: qsv_transcode input_stream codec output_stream initial option
31  * { frame_number new_option }
32  * e.g: - qsv_transcode input.mp4 h264_qsv output_h264.mp4 "g 60"
33  * - qsv_transcode input.mp4 hevc_qsv output_hevc.mp4 "g 60 async_depth 1"
34  * 100 "g 120"
35  * (initialize codec with gop_size 60 and change it to 120 after 100
36  * frames)
37  */
38 
39 #include <stdio.h>
40 #include <errno.h>
41 
42 #include <libavutil/hwcontext.h>
43 #include <libavcodec/avcodec.h>
44 #include <libavformat/avformat.h>
45 #include <libavutil/opt.h>
46 
50 static int video_stream = -1;
51 
52 typedef struct DynamicSetting {
54  char* optstr;
57 static int setting_number;
59 
60 static int str_to_dict(char* optstr, AVDictionary **opt)
61 {
62  char *key, *value;
63  if (strlen(optstr) == 0)
64  return 0;
65  key = strtok(optstr, " ");
66  if (key == NULL)
67  return AVERROR(ENAVAIL);
68  value = strtok(NULL, " ");
69  if (value == NULL)
70  return AVERROR(ENAVAIL);
71  av_dict_set(opt, key, value, 0);
72  do {
73  key = strtok(NULL, " ");
74  if (key == NULL)
75  return 0;
76  value = strtok(NULL, " ");
77  if (value == NULL)
78  return AVERROR(ENAVAIL);
79  av_dict_set(opt, key, value, 0);
80  } while(key != NULL);
81  return 0;
82 }
83 
85 {
87  int ret = 0;
88  static int frame_number = 0;
89  frame_number++;
91  frame_number == dynamic_setting[current_setting_number].frame_number) {
94  if (ret < 0) {
95  fprintf(stderr, "The dynamic parameter is wrong\n");
96  goto fail;
97  }
98  /* Set common option. The dictionary will be freed and replaced
99  * by a new one containing all options not found in common option list.
100  * Then this new dictionary is used to set private option. */
101  if ((ret = av_opt_set_dict(avctx, &opts)) < 0)
102  goto fail;
103  /* Set codec specific option */
104  if ((ret = av_opt_set_dict(avctx->priv_data, &opts)) < 0)
105  goto fail;
106  /* There is no "framerate" option in commom option list. Use "-r" to set
107  * framerate, which is compatible with ffmpeg commandline. The video is
108  * assumed to be average frame rate, so set time_base to 1/framerate. */
109  e = av_dict_get(opts, "r", NULL, 0);
110  if (e) {
111  avctx->framerate = av_d2q(atof(e->value), INT_MAX);
113  }
114  }
115 fail:
116  av_dict_free(&opts);
117  return ret;
118 }
119 
120 static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)
121 {
122  while (*pix_fmts != AV_PIX_FMT_NONE) {
123  if (*pix_fmts == AV_PIX_FMT_QSV) {
124  return AV_PIX_FMT_QSV;
125  }
126 
127  pix_fmts++;
128  }
129 
130  fprintf(stderr, "The QSV pixel format not offered in get_format()\n");
131 
132  return AV_PIX_FMT_NONE;
133 }
134 
135 static int open_input_file(char *filename)
136 {
137  int ret;
138  const AVCodec *decoder = NULL;
139  AVStream *video = NULL;
140 
141  if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {
142  fprintf(stderr, "Cannot open input file '%s', Error code: %s\n",
143  filename, av_err2str(ret));
144  return ret;
145  }
146 
147  if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
148  fprintf(stderr, "Cannot find input stream information. Error code: %s\n",
149  av_err2str(ret));
150  return ret;
151  }
152 
154  if (ret < 0) {
155  fprintf(stderr, "Cannot find a video stream in the input file. "
156  "Error code: %s\n", av_err2str(ret));
157  return ret;
158  }
159  video_stream = ret;
161 
162  switch(video->codecpar->codec_id) {
163  case AV_CODEC_ID_H264:
165  break;
166  case AV_CODEC_ID_HEVC:
168  break;
169  case AV_CODEC_ID_VP9:
171  break;
172  case AV_CODEC_ID_VP8:
174  break;
175  case AV_CODEC_ID_AV1:
177  break;
179  decoder = avcodec_find_decoder_by_name("mpeg2_qsv");
180  break;
181  case AV_CODEC_ID_MJPEG:
182  decoder = avcodec_find_decoder_by_name("mjpeg_qsv");
183  break;
184  default:
185  fprintf(stderr, "Codec is not supportted by qsv\n");
186  return AVERROR(ENAVAIL);
187  }
188 
190  return AVERROR(ENOMEM);
191 
192  if ((ret = avcodec_parameters_to_context(decoder_ctx, video->codecpar)) < 0) {
193  fprintf(stderr, "avcodec_parameters_to_context error. Error code: %s\n",
194  av_err2str(ret));
195  return ret;
196  }
198 
200  if (!decoder_ctx->hw_device_ctx) {
201  fprintf(stderr, "A hardware device reference create failed.\n");
202  return AVERROR(ENOMEM);
203  }
205  decoder_ctx->pkt_timebase = video->time_base;
206  if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0)
207  fprintf(stderr, "Failed to open codec for decoding. Error code: %s\n",
208  av_err2str(ret));
209 
210  return ret;
211 }
212 
213 static int encode_write(AVPacket *enc_pkt, AVFrame *frame)
214 {
215  int ret = 0;
216 
217  av_packet_unref(enc_pkt);
218 
219  if((ret = dynamic_set_parameter(encoder_ctx)) < 0) {
220  fprintf(stderr, "Failed to set dynamic parameter. Error code: %s\n",
221  av_err2str(ret));
222  goto end;
223  }
224 
225  if ((ret = avcodec_send_frame(encoder_ctx, frame)) < 0) {
226  fprintf(stderr, "Error during encoding. Error code: %s\n", av_err2str(ret));
227  goto end;
228  }
229  while (1) {
230  if (ret = avcodec_receive_packet(encoder_ctx, enc_pkt))
231  break;
232  enc_pkt->stream_index = 0;
234  ofmt_ctx->streams[0]->time_base);
235  if ((ret = av_interleaved_write_frame(ofmt_ctx, enc_pkt)) < 0) {
236  fprintf(stderr, "Error during writing data to output file. "
237  "Error code: %s\n", av_err2str(ret));
238  return ret;
239  }
240  }
241 
242 end:
243  if (ret == AVERROR_EOF)
244  return 0;
245  ret = ((ret == AVERROR(EAGAIN)) ? 0:-1);
246  return ret;
247 }
248 
249 static int dec_enc(AVPacket *pkt, const AVCodec *enc_codec, char *optstr)
250 {
251  AVFrame *frame;
252  int ret = 0;
253 
255  if (ret < 0) {
256  fprintf(stderr, "Error during decoding. Error code: %s\n", av_err2str(ret));
257  return ret;
258  }
259 
260  while (ret >= 0) {
261  if (!(frame = av_frame_alloc()))
262  return AVERROR(ENOMEM);
263 
265  if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
267  return 0;
268  } else if (ret < 0) {
269  fprintf(stderr, "Error while decoding. Error code: %s\n", av_err2str(ret));
270  goto fail;
271  }
272  if (!encoder_ctx->hw_frames_ctx) {
273  AVDictionaryEntry *e = NULL;
275  AVStream *ost;
276  /* we need to ref hw_frames_ctx of decoder to initialize encoder's codec.
277  Only after we get a decoded frame, can we obtain its hw_frames_ctx */
279  if (!encoder_ctx->hw_frames_ctx) {
280  ret = AVERROR(ENOMEM);
281  goto fail;
282  }
283  /* set AVCodecContext Parameters for encoder, here we keep them stay
284  * the same as decoder.
285  */
290  if ((ret = str_to_dict(optstr, &opts)) < 0) {
291  fprintf(stderr, "Failed to set encoding parameter.\n");
292  goto fail;
293  }
294  /* There is no "framerate" option in commom option list. Use "-r" to
295  * set framerate, which is compatible with ffmpeg commandline. The
296  * video is assumed to be average frame rate, so set time_base to
297  * 1/framerate. */
298  e = av_dict_get(opts, "r", NULL, 0);
299  if (e) {
300  encoder_ctx->framerate = av_d2q(atof(e->value), INT_MAX);
302  }
303  if ((ret = avcodec_open2(encoder_ctx, enc_codec, &opts)) < 0) {
304  fprintf(stderr, "Failed to open encode codec. Error code: %s\n",
305  av_err2str(ret));
306  av_dict_free(&opts);
307  goto fail;
308  }
309  av_dict_free(&opts);
310 
311  if (!(ost = avformat_new_stream(ofmt_ctx, enc_codec))) {
312  fprintf(stderr, "Failed to allocate stream for output format.\n");
313  ret = AVERROR(ENOMEM);
314  goto fail;
315  }
316 
319  if (ret < 0) {
320  fprintf(stderr, "Failed to copy the stream parameters. "
321  "Error code: %s\n", av_err2str(ret));
322  goto fail;
323  }
324 
325  /* write the stream header */
326  if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) {
327  fprintf(stderr, "Error while writing stream header. "
328  "Error code: %s\n", av_err2str(ret));
329  goto fail;
330  }
331  }
334  if ((ret = encode_write(pkt, frame)) < 0)
335  fprintf(stderr, "Error during encoding and writing.\n");
336 
337 fail:
339  if (ret < 0)
340  return ret;
341  }
342  return 0;
343 }
344 
345 int main(int argc, char **argv)
346 {
347  const AVCodec *enc_codec;
348  int ret = 0;
349  AVPacket *dec_pkt;
350 
351  if (argc < 5 || (argc - 5) % 2) {
352  av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <encoder> <output file>"
353  " <\"encoding option set 0\"> [<frame_number> <\"encoding options set 1\">]...\n", argv[0]);
354  return 1;
355  }
356  setting_number = (argc - 5) / 2;
359  for (int i = 0; i < setting_number; i++) {
360  dynamic_setting[i].frame_number = atoi(argv[i*2 + 5]);
361  dynamic_setting[i].optstr = argv[i*2 + 6];
362  }
363 
365  if (ret < 0) {
366  fprintf(stderr, "Failed to create a QSV device. Error code: %s\n", av_err2str(ret));
367  goto end;
368  }
369 
370  dec_pkt = av_packet_alloc();
371  if (!dec_pkt) {
372  fprintf(stderr, "Failed to allocate decode packet\n");
373  goto end;
374  }
375 
376  if ((ret = open_input_file(argv[1])) < 0)
377  goto end;
378 
379  if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) {
380  fprintf(stderr, "Could not find encoder '%s'\n", argv[2]);
381  ret = -1;
382  goto end;
383  }
384 
385  if ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, argv[3]))) < 0) {
386  fprintf(stderr, "Failed to deduce output format from file extension. Error code: "
387  "%s\n", av_err2str(ret));
388  goto end;
389  }
390 
391  if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) {
392  ret = AVERROR(ENOMEM);
393  goto end;
394  }
395 
396  ret = avio_open(&ofmt_ctx->pb, argv[3], AVIO_FLAG_WRITE);
397  if (ret < 0) {
398  fprintf(stderr, "Cannot open output file. "
399  "Error code: %s\n", av_err2str(ret));
400  goto end;
401  }
402 
403  /* read all packets and only transcoding video */
404  while (ret >= 0) {
405  if ((ret = av_read_frame(ifmt_ctx, dec_pkt)) < 0)
406  break;
407 
408  if (video_stream == dec_pkt->stream_index)
409  ret = dec_enc(dec_pkt, enc_codec, argv[4]);
410 
411  av_packet_unref(dec_pkt);
412  }
413 
414  /* flush decoder */
415  av_packet_unref(dec_pkt);
416  if ((ret = dec_enc(dec_pkt, enc_codec, argv[4])) < 0) {
417  fprintf(stderr, "Failed to flush decoder %s\n", av_err2str(ret));
418  goto end;
419  }
420 
421  /* flush encoder */
422  if ((ret = encode_write(dec_pkt, NULL)) < 0) {
423  fprintf(stderr, "Failed to flush encoder %s\n", av_err2str(ret));
424  goto end;
425  }
426 
427  /* write the trailer for output stream */
428  if ((ret = av_write_trailer(ofmt_ctx)) < 0)
429  fprintf(stderr, "Failed to write trailer %s\n", av_err2str(ret));
430 
431 end:
437  av_packet_free(&dec_pkt);
439  return ret;
440 }
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:422
AVCodec
AVCodec.
Definition: codec.h:204
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
avcodec_receive_packet
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
Read encoded data from the encoder.
Definition: encode.c:516
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: options.c:237
AVCodecContext::get_format
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
Callback to negotiate the pixel format.
Definition: avcodec.h:704
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
avcodec_parameters_from_context
int avcodec_parameters_from_context(AVCodecParameters *par, const AVCodecContext *codec)
Fill the parameters struct based on the values from the supplied codec context.
Definition: codec_par.c:99
get_format
static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)
Definition: qsv_transcode.c:120
DynamicSetting::optstr
char * optstr
Definition: qsv_transcode.c:54
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:116
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:330
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1284
AVDictionary
Definition: dict.c:32
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:1439
ost
static AVStream * ost
Definition: vaapi_transcode.c:45
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:73
DynamicSetting
Definition: qsv_transcode.c:52
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
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)
Find the "best" stream in the file.
Definition: avformat.c:413
setting_number
static int setting_number
Definition: qsv_transcode.c:57
AVCodecContext::framerate
AVRational framerate
Definition: avcodec.h:1782
avformat_close_input
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: demux.c:369
dec_enc
static int dec_enc(AVPacket *pkt, const AVCodec *enc_codec, char *optstr)
Definition: qsv_transcode.c:249
decoder
static const chunk_decoder decoder[8]
Definition: dfa.c:331
fail
#define fail()
Definition: checkasm.h:134
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:104
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:221
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:60
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:1767
ofmt_ctx
static AVFormatContext * ofmt_ctx
Definition: qsv_transcode.c:47
avcodec_alloc_context3
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:153
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:709
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:296
AVIO_FLAG_WRITE
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:634
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:450
AVFormatContext
Format I/O context.
Definition: avformat.h:1216
opts
AVDictionary * opts
Definition: movenc.c:50
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
dynamic_set_parameter
static int dynamic_set_parameter(AVCodecContext *avctx)
Definition: qsv_transcode.c:84
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:978
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:991
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:168
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1258
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:115
open_input_file
static int open_input_file(char *filename)
Definition: qsv_transcode.c:135
AV_PIX_FMT_QSV
@ AV_PIX_FMT_QSV
HW acceleration through QSV, data[3] contains a pointer to the mfxFrameSurface1 structure.
Definition: pixfmt.h:240
dynamic_setting
static DynamicSetting * dynamic_setting
Definition: qsv_transcode.c:56
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:563
current_setting_number
static int current_setting_number
Definition: qsv_transcode.c:58
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:2416
main
int main(int argc, char **argv)
Definition: qsv_transcode.c:345
ifmt_ctx
static AVFormatContext * ifmt_ctx
Definition: qsv_transcode.c:47
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.
Definition: avcodec.h:1796
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:678
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:62
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:223
encode_write
static int encode_write(AVPacket *enc_pkt, AVFrame *frame)
Definition: qsv_transcode.c:213
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:526
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:607
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:1255
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
video_stream
static int video_stream
Definition: qsv_transcode.c:50
avcodec_parameters_to_context
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
Definition: codec_par.c:182
encoder_ctx
static AVCodecContext * encoder_ctx
Definition: qsv_transcode.c:49
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:1980
AVCodecContext::height
int height
Definition: avcodec.h:613
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:483
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:650
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:1930
avcodec.h
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:948
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
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:615
avformat.h
AV_HWDEVICE_TYPE_QSV
@ AV_HWDEVICE_TYPE_QSV
Definition: hwcontext.h:33
AVCodecContext
main external API structure.
Definition: avcodec.h:440
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
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:1225
AVPacket::stream_index
int stream_index
Definition: packet.h:376
DynamicSetting::frame_number
int frame_number
Definition: qsv_transcode.c:53
str_to_dict
static int str_to_dict(char *optstr, AVDictionary **opt)
Definition: qsv_transcode.c:60
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
AVDictionaryEntry
Definition: dict.h:89
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:467
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:1240
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:86
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:613
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:49
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:91
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:48
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:986