FFmpeg 4.4.5
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extract_mvs.c
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1/*
2 * Copyright (c) 2012 Stefano Sabatini
3 * Copyright (c) 2014 Clément Bœsch
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21 * THE SOFTWARE.
22 */
23
26
27static AVFormatContext *fmt_ctx = NULL;
29static AVStream *video_stream = NULL;
30static const char *src_filename = NULL;
31
32static int video_stream_idx = -1;
33static AVFrame *frame = NULL;
34static int video_frame_count = 0;
35
36static int decode_packet(const AVPacket *pkt)
37{
39 if (ret < 0) {
40 fprintf(stderr, "Error while sending a packet to the decoder: %s\n", av_err2str(ret));
41 return ret;
42 }
43
44 while (ret >= 0) {
46 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
47 break;
48 } else if (ret < 0) {
49 fprintf(stderr, "Error while receiving a frame from the decoder: %s\n", av_err2str(ret));
50 return ret;
51 }
52
53 if (ret >= 0) {
54 int i;
56
59 if (sd) {
60 const AVMotionVector *mvs = (const AVMotionVector *)sd->data;
61 for (i = 0; i < sd->size / sizeof(*mvs); i++) {
62 const AVMotionVector *mv = &mvs[i];
63 printf("%d,%2d,%2d,%2d,%4d,%4d,%4d,%4d,0x%"PRIx64"\n",
65 mv->w, mv->h, mv->src_x, mv->src_y,
66 mv->dst_x, mv->dst_y, mv->flags);
67 }
68 }
70 }
71 }
72
73 return 0;
74}
75
77{
78 int ret;
79 AVStream *st;
80 AVCodecContext *dec_ctx = NULL;
81 AVCodec *dec = NULL;
82 AVDictionary *opts = NULL;
83
84 ret = av_find_best_stream(fmt_ctx, type, -1, -1, &dec, 0);
85 if (ret < 0) {
86 fprintf(stderr, "Could not find %s stream in input file '%s'\n",
88 return ret;
89 } else {
90 int stream_idx = ret;
91 st = fmt_ctx->streams[stream_idx];
92
94 if (!dec_ctx) {
95 fprintf(stderr, "Failed to allocate codec\n");
96 return AVERROR(EINVAL);
97 }
98
100 if (ret < 0) {
101 fprintf(stderr, "Failed to copy codec parameters to codec context\n");
102 return ret;
103 }
104
105 /* Init the video decoder */
106 av_dict_set(&opts, "flags2", "+export_mvs", 0);
107 if ((ret = avcodec_open2(dec_ctx, dec, &opts)) < 0) {
108 fprintf(stderr, "Failed to open %s codec\n",
110 return ret;
111 }
112
113 video_stream_idx = stream_idx;
116 }
117
118 return 0;
119}
120
121int main(int argc, char **argv)
122{
123 int ret = 0;
124 AVPacket pkt = { 0 };
125
126 if (argc != 2) {
127 fprintf(stderr, "Usage: %s <video>\n", argv[0]);
128 exit(1);
129 }
130 src_filename = argv[1];
131
132 if (avformat_open_input(&fmt_ctx, src_filename, NULL, NULL) < 0) {
133 fprintf(stderr, "Could not open source file %s\n", src_filename);
134 exit(1);
135 }
136
137 if (avformat_find_stream_info(fmt_ctx, NULL) < 0) {
138 fprintf(stderr, "Could not find stream information\n");
139 exit(1);
140 }
141
143
145
146 if (!video_stream) {
147 fprintf(stderr, "Could not find video stream in the input, aborting\n");
148 ret = 1;
149 goto end;
150 }
151
153 if (!frame) {
154 fprintf(stderr, "Could not allocate frame\n");
155 ret = AVERROR(ENOMEM);
156 goto end;
157 }
158
159 printf("framenum,source,blockw,blockh,srcx,srcy,dstx,dsty,flags\n");
160
161 /* read frames from the file */
162 while (av_read_frame(fmt_ctx, &pkt) >= 0) {
164 ret = decode_packet(&pkt);
166 if (ret < 0)
167 break;
168 }
169
170 /* flush cached frames */
171 decode_packet(NULL);
172
173end:
177 return ret < 0;
178}
Main libavformat public API header.
static AVPacket * pkt
static int open_codec_context(AVFormatContext *fmt_ctx, enum AVMediaType type)
Definition extract_mvs.c:76
static AVCodecContext * video_dec_ctx
Definition extract_mvs.c:28
static int decode_packet(const AVPacket *pkt)
Definition extract_mvs.c:36
int main(int argc, char **argv)
static AVFormatContext * fmt_ctx
Definition extract_mvs.c:27
static AVStream * video_stream
Definition extract_mvs.c:29
static int video_frame_count
Definition extract_mvs.c:34
static const char * src_filename
Definition extract_mvs.c:30
static AVFrame * frame
Definition extract_mvs.c:33
static int video_stream_idx
Definition extract_mvs.c:32
static AVCodecContext * dec_ctx
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer.
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, AVCodec **decoder_ret, int flags)
Find the "best" stream in the file.
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
int avformat_open_input(AVFormatContext **ps, const char *url, ff_const59 AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
void av_dump_format(AVFormatContext *ic, int index, const char *url, int is_output)
Print detailed information about the input or output format, such as duration, bitrate,...
struct AVDictionary AVDictionary
Definition dict.h:86
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
#define AVERROR_EOF
End of file.
Definition error.h:55
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition error.h:119
#define AVERROR(e)
Definition error.h:43
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
AVFrameSideData * av_frame_get_side_data(const AVFrame *frame, enum AVFrameSideDataType type)
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
@ AV_FRAME_DATA_MOTION_VECTORS
Motion vectors exported by some codecs (on demand through the export_mvs flag set in the libavcodec A...
Definition frame.h:96
const char * av_get_media_type_string(enum AVMediaType media_type)
Return a string describing the media_type enum, NULL if media_type is unknown.
AVMediaType
Definition avutil.h:199
@ AVMEDIA_TYPE_VIDEO
Definition avutil.h:201
main external API structure.
Definition avcodec.h:536
AVCodec.
Definition codec.h:197
Format I/O context.
Definition avformat.h:1232
AVStream ** streams
A list of all streams in the file.
Definition avformat.h:1300
Structure to hold side data for an AVFrame.
Definition frame.h:220
size_t size
Definition frame.h:226
uint8_t * data
Definition frame.h:222
This structure describes decoded (raw) audio or video data.
Definition frame.h:318
int32_t source
Where the current macroblock comes from; negative value when it comes from the past,...
int16_t dst_x
Absolute destination position.
uint64_t flags
Extra flag information.
uint8_t w
Width and height of the block.
int16_t src_x
Absolute source position.
This structure stores compressed data.
Definition packet.h:346
int stream_index
Definition packet.h:371
Stream structure.
Definition avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition avformat.h:1038