./ffmpeg_g -re -i /home/tsdl/Downloads/test0524.mp4 -vcodec libx264 -profile:v baseline -r 25 -g 50 -f rtc "http://192.168.114.34:1985/rtc/v1/whip/?app=live&stream=livestream"生成C代码示例

以下是使用FFmpeg库生成相应的C代码示例，可以实现将本地视频文件实时推流到指定的RTMP服务器：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>

#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libavutil/avutil.h>

int main(int argc, char **argv)
{
    AVFormatContext *fmt_ctx = NULL;
    AVCodecContext *video_enc_ctx = NULL;
    AVCodec *video_enc = NULL;
    AVStream *video_stream = NULL;
    AVOutputFormat *out_fmt = NULL;
    AVIOContext *out_io_ctx = NULL;
    AVFormatContext *out_fmt_ctx = NULL;
    AVPacket pkt;
    int ret;

    char *in_filename = "/home/tsdl/Downloads/test0524.mp4";
    char *out_filename = "http://192.168.114.34:1985/rtc/v1/whip/?app=live&stream=livestream";

    // 注册所有的编解码器、封装器和协议
    av_register_all();
    avformat_network_init();

    // 打开输入文件
    if ((ret = avformat_open_input(&fmt_ctx, in_filename, NULL, NULL)) < 0) {
        fprintf(stderr, "Could not open input file '%s'\n", in_filename);
        goto end;
    }

    // 查找流信息
    if ((ret = avformat_find_stream_info(fmt_ctx, NULL)) < 0) {
        fprintf(stderr, "Could not find stream information\n");
        goto end;
    }

    // 选择视频流
    int video_stream_index = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &video_enc, 0);
    if (video_stream_index < 0) {
        fprintf(stderr, "Could not find video stream in input file '%s'\n", in_filename);
        goto end;
    }

    // 打开视频解码器
    video_enc_ctx = avcodec_alloc_context3(video_enc);
    if (!video_enc_ctx) {
        fprintf(stderr, "Could not allocate video encoder context\n");
        goto end;
    }

    if ((ret = avcodec_parameters_to_context(video_enc_ctx, fmt_ctx->streams[video_stream_index]->codecpar)) < 0) {
        fprintf(stderr, "Could not copy video codec parameters to encoder context\n");
        goto end;
    }

    if ((ret = avcodec_open2(video_enc_ctx, video_enc, NULL)) < 0) {
        fprintf(stderr, "Could not open video encoder\n");
        goto end;
    }

    // 创建输出格式上下文
    if ((ret = avformat_alloc_output_context2(&out_fmt_ctx, NULL, "rtmp", out_filename)) < 0) {
        fprintf(stderr, "Could not allocate output format context\n");
        goto end;
    }

    // 创建输出流
    video_stream = avformat_new_stream(out_fmt_ctx, NULL);
    if (!video_stream) {
        fprintf(stderr, "Could not allocate video output stream\n");
        goto end;
    }

    // 复制编解码器参数
    if ((ret = avcodec_parameters_copy(video_stream->codecpar, fmt_ctx->streams[video_stream_index]->codecpar)) < 0) {
        fprintf(stderr, "Could not copy video codec parameters\n");
        goto end;
    }

    // 设置输出流时间基准
    video_stream->time_base = video_enc_ctx->time_base;

    // 打开输出IO上下文
    if ((ret = avio_open2(&out_io_ctx, out_filename, AVIO_FLAG_WRITE, NULL, NULL)) < 0) {
        fprintf(stderr, "Could not open output url '%s'\n", out_filename);
        goto end;
    }

    out_fmt_ctx->pb = out_io_ctx;

    // 写入输出格式头部
    if ((ret = avformat_write_header(out_fmt_ctx, NULL)) < 0) {
        fprintf(stderr, "Could not write output format header\n");
        goto end;
    }

    // 初始化AVPacket
    av_init_packet(&pkt);
    pkt.data = NULL;
    pkt.size = 0;

    // 读取并编码视频帧
    while (1) {
        AVStream *in_stream, *out_stream;
        AVFrame *frame = av_frame_alloc();

        if ((ret = av_read_frame(fmt_ctx, &pkt)) < 0) {
            break;
        }

        if (pkt.stream_index == video_stream_index) {
            avcodec_send_packet(video_enc_ctx, &pkt);

            while (ret >= 0) {
                ret = avcodec_receive_frame(video_enc_ctx, frame);
                if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
                    break;
                } else if (ret < 0) {
                    fprintf(stderr, "Error while receiving a video frame from the encoder\n");
                    goto end;
                }

                // 编码并发送视频帧
                av_packet_unref(&pkt);
                av_init_packet(&pkt);

                ret = avcodec_send_frame(video_enc_ctx, frame);
                if (ret < 0) {
                    fprintf(stderr, "Error while sending a video frame to the encoder\n");
                    goto end;
                }

                while (ret >= 0) {
                    ret = avcodec_receive_packet(video_enc_ctx, &pkt);
                    if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
                        break;
                    } else if (ret < 0) {
                        fprintf(stderr, "Error while receiving a video packet from the encoder\n");
                        goto end;
                    }

                    // 发送视频包到输出流
                    av_packet_rescale_ts(&pkt, video_enc_ctx->time_base, video_stream->time_base);
                    pkt.stream_index = video_stream->index;
                    av_interleaved_write_frame(out_fmt_ctx, &pkt);

                    av_packet_unref(&pkt);
                    av_init_packet(&pkt);
                }
            }

            av_frame_unref(frame);
        }

        av_packet_unref(&pkt);
    }

    // 写入输出格式尾部
    av_write_trailer(out_fmt_ctx);

end:
    if (video_enc_ctx) {
        avcodec_free_context(&video_enc_ctx);
    }

    if (fmt_ctx) {
        avformat_close_input(&fmt_ctx);
    }

    if (out_fmt_ctx) {
        avio_closep(&out_fmt_ctx->pb);
        avformat_free_context(out_fmt_ctx);
    }

    if (out_io_ctx) {
        av_freep(&out_io_ctx->buffer);
        av_free(out_io_ctx);
    }

    if (ret < 0) {
        fprintf(stderr, "Error occurred: %s\n", av_err2str(ret));
        return 1;
    }

    return 0;
}

注意需要将代码中的输入文件路径和输出URL替换为实际的路径和URL。另外，还需要在编译时链接FFmpeg库，例如使用gcc编译器编译上述代码的命令为：

gcc -o ffmpeg_push_stream ffmpeg_push_stream.c -lavformat -lavcodec -lavutil -lm