FFmpegAVDemuxer is a muxer dependent on FFmpeg lib, which can mux video stream and audio stream to media files. Currently, only mux MP4/FMP4 is supported（Currently, only Video Stream is supported.）, and we will add support for more types of files in the future.

API Instructions

namespace com { namespace sunplus { namespace media {

class FFmpegAVMuxer {

public:
    FFmpegAVMuxer(bool isFMP4 = false);
    ~FFmpegAVMuxer();

public:
    int init(std::string filepath, AVCodecContext* videoCodecCtx);
    int init(std::string filepath, VideoStreamParam_t param, uint8_t* spspps, int spsppsSize);
    void uninit();

    int putVideoFrame(AVPacket*& packet);
    int flush();
};

}}}

Constructors

FFmpegAVMuxer(bool isFMP4 = false)

init

Initialize muxer, set stream parameters, and write a header to the file.

/**
 * initialize demuxer.
 *
 * @param filepath the file to write.
 *
 * @param videoCodecCtx used to initialize stream.
 *
 * @return 0 if OK, < 0 on error. 
 */
int init(std::string filepath, AVCodecContext* videoCodecCtx);

/**
 * initialize demuxer.
 *
 * @param filepath the file to write.
 *
 * @param param used to initialize stream.
 *
 * @param spspps used to initialize stream.
 *
 * @return 0 if OK, < 0 on error. 
 */
int init(std::string filepath, VideoStreamParam_t param, uint8_t* spspps, int spsppsSize);

uninit

Release all resources allocated by the init method and close the file.

/**
 * Release all resources allocated by the init method.
 */
void uninit();

putVideoFrame

Write the video packet to the muxer.

/**
 * write the packet to the muxer.
 * @return 0 if OK, < 0 on error. 
 */
int putVideoFrame(AVPacket*& packet);

flush

Flush data buffered within the muxer and write the stream trailer to output media file.

It must be called after when there are no new frames to be written.

/**
 * Flush data buffered within the muxer and rite the stream trailer to an output media file
 * @return 0 if OK, < 0 on error. 
 */
int flush();

Sample Code

This is a sample of how to record MP4 dependent on FFmpegH264Provider and FFmpegAVMuxer.

the flow of record MP4:

create yuv source --> create h264 provider --> h264 provider prepare -> create MP4 muxer -> init muxer --> create the thread of get the frame from h264 provider to put to muxer --> uninit muxer

void FFmpegMP4Muxer_Test(const char* path) {
    auto videoSource = make_shared<FFmpegV4L2VideoSource>("/dev/video0");
    AVDictionary *options = nullptr;
    av_dict_set(&options, "video_size", "1280x720", 0);
    av_dict_set(&options, "framerate", "30", 0);
    av_dict_set(&options, "pixel_format", "uyvy422", 0);

    int ret = videoSource->open(options);

    auto h264Provider = make_shared<FFmpegH264Provider>(videoSource);

    VideoStreamParam_t param;
    param.width = videoSource->getAVStream()->codecpar->width;
    param.height = videoSource->getAVStream()->codecpar->height;
    param.pix_fmt = (enum AVPixelFormat)videoSource->getAVStream()->codecpar->format;
    param.time_base = videoSource->getAVStream()->time_base;
    param.gop = 30;
    param.bitrate = 1000000;
    param.fps = 30;

    auto mp4Muxer = make_shared<FFmpegAVMuxer>(true);
    ret = h264Provider->prepare(param);

    string filepath = "ffmpeg_fmp4_muxer_test.mp4";
    if (path != nullptr) {
        filepath = string(path);
    }

    auto muxMp4ThreadFunc = [&](){
        int index = 0;
        bool initMuxer = false;
        while(!is_exit) {
            AVPacket* packet = nullptr;
            auto ret = h264Provider->getFrame(packet);
            
            if (ret < 0 || packet == nullptr) {
                std::this_thread::sleep_for(std::chrono::milliseconds(10));
                continue;
            }

            printf("muxMp4Thread, get h264 frame[%d] pts: %lld, size: %d, isKeyFrame: %d\n", index, packet->pts, packet->size, packet->flags & AV_PKT_FLAG_KEY);

            if (!initMuxer) {
                ret = mp4Muxer->init(filepath, h264Provider->getAVCodecContext());
                initMuxer = true;
            }

            ret = mp4Muxer->putVideoFrame(packet);

            av_packet_unref(packet);
            av_packet_free(&packet);
            index++;
        }
        mp4Muxer->flush();
        mp4Muxer->uninit();
    };
    
    auto thread = make_shared<std::thread>(muxMp4ThreadFunc);

    _wait_exit("FFmpegMP4Muxer_Test");

    h264Provider->destroy();
    videoSource->close();

}

Test Result

./ffmpeg_sample mp4record [filepath]

C3V Documentation

FFmpegAVMuxer

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