static void video_encode_example(const char *filename, int codec_id) { AVCodec *codec; AVCodecContext *c= NULL; int i, ret, x, y, got_output; FILE *f; AVFrame *picture; AVPacket pkt; uint8_t endcode[] = { 0, 0, 1, 0xb7 }; printf("Encode video file %s\n", filename); /* find the mpeg1 video encoder */ codec = avcodec_find_encoder(codec_id); if (!codec) { fprintf(stderr, "codec not found\n"); exit(1); } c = avcodec_alloc_context3(codec); picture= avcodec_alloc_frame(); /* put sample parameters */ c->bit_rate = 400000; /* resolution must be a multiple of two */ c->width = 352; c->height = 288; /* frames per second */ c->time_base= (AVRational){1,25}; c->gop_size = 10; /* emit one intra frame every ten frames */ c->max_b_frames=1; c->pix_fmt = PIX_FMT_YUV420P; if(codec_id == AV_CODEC_ID_H264) av_opt_set(c->priv_data, "preset", "slow", 0); /* open it */ if (avcodec_open2(c, codec, NULL) < 0) { fprintf(stderr, "could not open codec\n"); exit(1); } f = fopen(filename, "wb"); if (!f) { fprintf(stderr, "could not open %s\n", filename); exit(1); } /* the image can be allocated by any means and av_image_alloc() is * just the most convenient way if av_malloc() is to be used */ ret = av_image_alloc(picture->data, picture->linesize, c->width, c->height, c->pix_fmt, 32); if (ret < 0) { fprintf(stderr, "could not alloc raw picture buffer\n"); exit(1); } picture->format = c->pix_fmt; picture->width = c->width; picture->height = c->height; /* encode 1 second of video */ for(i=0;i<25;i++) { av_init_packet(&pkt); pkt.data = NULL; // packet data will be allocated by the encoder pkt.size = 0; fflush(stdout); /* prepare a dummy image */ /* Y */ for(y=0;y<c->height;y++) { for(x=0;x<c->width;x++) { picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3; } } /* Cb and Cr */ for(y=0;y<c->height/2;y++) { for(x=0;x<c->width/2;x++) { picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2; picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5; } } picture->pts = i; /* encode the image */ ret = avcodec_encode_video2(c, &pkt, picture, &got_output); if (ret < 0) { fprintf(stderr, "error encoding frame\n"); exit(1); } if (got_output) { printf("encoding frame %3d (size=%5d)\n", i, pkt.size); fwrite(pkt.data, 1, pkt.size, f); av_free_packet(&pkt); } } /* get the delayed frames */ for (got_output = 1; got_output; i++) { fflush(stdout); ret = avcodec_encode_video2(c, &pkt, NULL, &got_output); if (ret < 0) { fprintf(stderr, "error encoding frame\n"); exit(1); } if (got_output) { printf("write frame %3d (size=%5d)\n", i, pkt.size); fwrite(pkt.data, 1, pkt.size, f); av_free_packet(&pkt); } } /* add sequence end code to have a real mpeg file */ fwrite(endcode, 1, sizeof(endcode), f); fclose(f); avcodec_close(c); av_free(c); av_freep(&picture->data[0]); av_free(picture); printf("\n"); }
static void video_encode_example(const char *filename, int codec_id) { AVCodec *codec; AVCodecContext *c= NULL; int i, ret, x, y, got_output; FILE *f; AVFrame *picture; AVPacket pkt; uint8_t endcode[] = { 0, 0, 1, 0xb7 }; printf("Encode video file %s\n", filename);   codec = avcodec_find_encoder(codec_id); if (!codec) { fprintf(stderr, "codec not found\n"); exit(1); } c = avcodec_alloc_context3(codec); picture= avcodec_alloc_frame();   c->bit_rate = 400000;   c->width = 352; c->height = 288;   c->time_base= (AVRational){1,25}; c->gop_size = 10;   c->max_b_frames=1; c->pix_fmt = PIX_FMT_YUV420P; if(codec_id == AV_CODEC_ID_H264) av_opt_set(c->priv_data, "preset", "slow", 0);   if (avcodec_open2(c, codec, NULL) < 0) { fprintf(stderr, "could not open codec\n"); exit(1); } f = fopen(filename, "wb"); if (!f) { fprintf(stderr, "could not open %s\n", filename); exit(1); }   ret = av_image_alloc(picture->data, picture->linesize, c->width, c->height, c->pix_fmt, 32); if (ret < 0) { fprintf(stderr, "could not alloc raw picture buffer\n"); exit(1); } picture->format = c->pix_fmt; picture->width = c->width; picture->height = c->height;   for(i=0;i<25;i++) { av_init_packet(&pkt); pkt.data = NULL;  