Encoding images to video with ffmpeg

http://stackoverflow.com/questions/3334939/encoding-images-to-video-with-ffmpeg

  // Register all formats and codecs    av_register_all();    AVCodec *codec;    AVCodecContext *c= NULL;    int i, out_size, size, outbuf_size;    FILE *f;    AVFrame *picture;    uint8_t *outbuf;    printf("Video encoding\n");    /* find the mpeg video encoder */    codec = avcodec_find_encoder(CODEC_ID_MPEG2VIDEO);    if (!codec) {        fprintf(stderr, "codec not found\n");        exit(1);    }    c= avcodec_alloc_context();    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;    /* open it */    if (avcodec_open(c, codec) < 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);    }    /* alloc image and output buffer */    outbuf_size = 100000;    outbuf = malloc(outbuf_size);    size = c->width * c->height;#pragma mark -    AVFrame* outpic = avcodec_alloc_frame();    int nbytes = avpicture_get_size(PIX_FMT_YUV420P, c->width, c->height);    //create buffer for the output image    uint8_t* outbuffer = (uint8_t*)av_malloc(nbytes);#pragma mark -      for(i=1;i<77;i++) {        fflush(stdout);        int numBytes = avpicture_get_size(PIX_FMT_YUV420P, c->width, c->height);        uint8_t *buffer = (uint8_t *)av_malloc(numBytes*sizeof(uint8_t));        UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"10%d", i]];        CGImageRef newCgImage = [image CGImage];        CGDataProviderRef dataProvider = CGImageGetDataProvider(newCgImage);        CFDataRef bitmapData = CGDataProviderCopyData(dataProvider);        buffer = (uint8_t *)CFDataGetBytePtr(bitmapData);           avpicture_fill((AVPicture*)picture, buffer, PIX_FMT_RGB8, c->width, c->height);        avpicture_fill((AVPicture*)outpic, outbuffer, PIX_FMT_YUV420P, c->width, c->height);        struct SwsContext* fooContext = sws_getContext(c->width, c->height,                                                 PIX_FMT_RGB8,                                                 c->width, c->height,                                                 PIX_FMT_YUV420P,                                                 SWS_FAST_BILINEAR, NULL, NULL, NULL);        //perform the conversion        sws_scale(fooContext, picture->data, picture->linesize, 0, c->height, outpic->data, outpic->linesize);        // Here is where I try to convert to YUV        /* encode the image */        out_size = avcodec_encode_video(c, outbuf, outbuf_size, outpic);        printf("encoding frame %3d (size=%5d)\n", i, out_size);        fwrite(outbuf, 1, out_size, f);        free(buffer);        buffer = NULL;          }    /* get the delayed frames */    for(; out_size; i++) {        fflush(stdout);        out_size = avcodec_encode_video(c, outbuf, outbuf_size, NULL);        printf("write frame %3d (size=%5d)\n", i, out_size);        fwrite(outbuf, 1, outbuf_size, f);          }    /* add sequence end code to have a real mpeg file */    outbuf[0] = 0x00;    outbuf[1] = 0x00;    outbuf[2] = 0x01;    outbuf[3] = 0xb7;    fwrite(outbuf, 1, 4, f);    fclose(f);    free(outbuf);    avcodec_close(c);    av_free(c);    av_free(picture);    printf("\n");