H.264 封装mp4源码

H.264 封装 mp4 的源码可以使用开源库 ffmpeg 来实现。以下是一个示例代码：

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

#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavutil/opt.h>
#include <libswscale/swscale.h>

int main(int argc, char *argv[]) {
    AVFormatContext *fmt_ctx = NULL;
    AVOutputFormat *out_fmt = NULL;
    AVStream *video_stream = NULL;
    AVCodecContext *codec_ctx = NULL;
    AVCodec *codec = NULL;
    AVPacket pkt = { 0 };

    if (argc != 3) {
        printf("Usage: %s <input_file> <output_file>\n", argv[0]);
        return 1;
    }

    av_register_all();

    if (avformat_open_input(&fmt_ctx, argv[1], NULL, NULL) < 0) {
        printf("Error: Failed to open input file %s\n", argv[1]);
        return 1;
    }

    if (avformat_find_stream_info(fmt_ctx, NULL) < 0) {
        printf("Error: Failed to find stream information\n");
        return 1;
    }

    for (int i = 0; i < fmt_ctx->nb_streams; i++) {
        AVStream *stream = fmt_ctx->streams[i];
        AVCodecParameters *codecpar = stream->codecpar;

        if (codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
            codec = avcodec_find_decoder(codecpar->codec_id);
            if (!codec) {
                printf("Error: Failed to find decoder for video stream\n");
                return 1;
            }

            codec_ctx = avcodec_alloc_context3(codec);
            if (!codec_ctx) {
                printf("Error: Failed to allocate codec context\n");
                return 1;
            }

            if (avcodec_parameters_to_context(codec_ctx, codecpar) < 0) {
                printf("Error: Failed to copy codec parameters to context\n");
                return 1;
            }

            if (avcodec_open2(codec_ctx, codec, NULL) < 0) {
                printf("Error: Failed to open codec\n");
                return 1;
            }

            video_stream = avformat_new_stream(fmt_ctx, codec);
            if (!video_stream) {
                printf("Error: Failed to create new stream\n");
                return 1;
            }

            if (avcodec_parameters_copy(video_stream->codecpar, codecpar) < 0) {
                printf("Error: Failed to copy codec parameters\n");
                return 1;
            }

            out_fmt = av_guess_format(NULL, argv[2], NULL);
            if (!out_fmt) {
                printf("Error: Failed to guess output format\n");
                return 1;
            }

            if (avio_open(&fmt_ctx->pb, argv[2], AVIO_FLAG_WRITE) < 0) {
                printf("Error: Failed to open output file\n");
                return 1;
            }

            if (avformat_write_header(fmt_ctx, NULL) < 0) {
                printf("Error: Failed to write format header\n");
                return 1;
            }
        }
    }

    if (!video_stream) {
        printf("Error: Failed to find video stream\n");
        return 1;
    }

    while (av_read_frame(fmt_ctx, &pkt) == 0) {
        if (pkt.stream_index == video_stream->index) {
            if (av_write_frame(fmt_ctx, &pkt) < 0) {
                printf("Error: Failed to write frame\n");
                return 1;
            }
        }
        av_packet_unref(&pkt);
    }

    if (av_write_trailer(fmt_ctx) < 0) {
        printf("Error: Failed to write trailer\n");
        return 1;
    }

    avcodec_free_context(&codec_ctx);
    avformat_close_input(&fmt_ctx);
    avformat_free_context(fmt_ctx);

    return 0;
}

这个代码可以打开一个 H.264 视频文件，封装成 MP4 格式的文件并输出到指定的输出文件中。你可以根据实际情况修改代码中的输入文件和输出文件路径。