version

#define LIBAVUTIL_VERSION_MAJOR  58

#define LIBAVUTIL_VERSION_MINOR  12

#define LIBAVUTIL_VERSION_MICRO 100

note

不使用AVOutputFormat

code

void CFfmpegOps::EncodeRGB24ToPNG(const char *infile, const char *width_str, const char *height_str, const char *outfile)
{if ((!infile) || (!width_str) || (!height_str) || (!outfile)){return;}int width = 0;int height = 0;AVFrame *rgb24frame = nullptr;int rgb24frame_bytes = 0;AVPixelFormat rgb24_fmt = AV_PIX_FMT_RGB24;int ret = -1;FILE *in_fp = nullptr;size_t n = 0;AVPacket *pkt = nullptr;const AVCodec *png_encoder = nullptr;AVCodecContext *png_encoder_ctx = nullptr;FILE *out_fp = nullptr;try{width = std::stoi(width_str);height = std::stoi(height_str);}catch (const std::exception &e){return;}rgb24frame = av_frame_alloc();if (!rgb24frame){printf("av_frame_alloc error\n");goto end;}rgb24frame->format = rgb24_fmt;rgb24frame->width = width;rgb24frame->height = height;rgb24frame_bytes = av_image_get_buffer_size(rgb24_fmt, width, height, 1);ret = av_frame_get_buffer(rgb24frame, 0);if (ret < 0){printf("av_frame_get_buffer error(%s)\n", GetFfmpegERR(ret));goto end;}in_fp = fopen(infile, "rb");if (!in_fp){printf("fopen error\n");goto end;}n = fread(rgb24frame->data[0], sizeof(uint8_t), width * height * 3, in_fp);if ((int)n != (width * height * 3)){printf("n != (width * height * 3)\n");goto end;}pkt = av_packet_alloc();if (!pkt){printf("av_packet_alloc error\n");goto end;}png_encoder = avcodec_find_encoder(AV_CODEC_ID_PNG);if (!png_encoder){printf("avcodec_find_encoder error\n");goto end;}png_encoder_ctx = avcodec_alloc_context3(png_encoder);if (!png_encoder_ctx){printf("avcodec_alloc_context3 error\n");goto end;}png_encoder_ctx->pix_fmt = rgb24_fmt;png_encoder_ctx->width = width;png_encoder_ctx->height = height;png_encoder_ctx->time_base.num = 1;png_encoder_ctx->time_base.den = 25;png_encoder_ctx->framerate.num = 25;png_encoder_ctx->framerate.den = 1;png_encoder_ctx->bit_rate = rgb24frame_bytes * png_encoder_ctx->framerate.num * 8;ret = avcodec_open2(png_encoder_ctx, png_encoder, nullptr);if (ret < 0){printf("avcodec_open2 error(%s)\n", GetFfmpegERR(ret));goto end;}out_fp = fopen(outfile, "wb");if (!out_fp){printf("fopen error\n");goto end;}ret = avcodec_send_frame(png_encoder_ctx, rgb24frame);if (ret != 0){printf("avcodec_send_frame error(%s)\n", GetFfmpegERR(ret));goto end;}while (1){ret = avcodec_receive_packet(png_encoder_ctx, pkt);if (ret != 0){if (ret == AVERROR(EAGAIN)){continue;}printf("avcodec_receive_packet error(%s)\n", GetFfmpegERR(ret));break;}n = fwrite(pkt->data, pkt->size, sizeof(uint8_t), out_fp);av_packet_unref(pkt);break;}end:if (out_fp){fclose(out_fp);out_fp = nullptr;}if (png_encoder_ctx){avcodec_free_context(&png_encoder_ctx);png_encoder_ctx = nullptr;}if (pkt){av_packet_free(&pkt);pkt = nullptr;}if (in_fp){fclose(in_fp);in_fp = nullptr;}if (rgb24frame){av_frame_free(&rgb24frame);rgb24frame = nullptr;}
}

performance