多路复用的原始H.264到MP4文件，一些奇怪的错误

我正在做的是在Xcode 7.3的IOS应用程序。

我使用UDP从ip摄像头获得h264数据，数据可以正确解码和显示（由ffmpeg解码）。 现在我想把原始的H264数据复制到一个mp4文件（一些用户可能想logging他在手机上观看的内容），使用ffmpeg。 代码运行时没有发生任何错误，并且可以在我的计算机上使用QuickTime正常播放结果文件。 但当用iphone的默认video播放器在iPhone上播放时，它不能正常播放。这是我的代码。

希望有人能告诉我该怎么办，谢谢！

在里面 

AVFormatContext *formatContext; AVOutputFormat *outputFormat; AVStream *video_st; int STREAM_FRAME_RATE = 15; unsigned long video_PTS; int initRecorder(char *fileName, int width, int height) { video_st = NULL; video_PTS = 0; av_register_all(); outputFormat = av_guess_format(NULL, fileName, NULL); if (!outputFormat) { zj_printf("av_guess_format -> fail\n"); return -1; } outputFormat->video_codec = AV_CODEC_ID_H264; avformat_alloc_output_context2(&formatContext, NULL, NULL, fileName); if (!formatContext) { zj_printf("avformat_alloc_context -> fail\n"); return -2; } formatContext->oformat = outputFormat; strcpy(formatContext->filename, fileName); video_st = add_video_stream(formatContext, outputFormat, width, height); if (!video_st || open_video(formatContext, video_st)) { zj_printf("Could not open video codec\n"); return -3; } av_dump_format(formatContext, 0, fileName, 1); if (!(outputFormat->flags & AVFMT_NOFILE)) { if (avio_open(&formatContext->pb, fileName, AVIO_FLAG_READ_WRITE) < 0) { zj_printf("could not open file: %s\n", fileName); return -7; } } /* write the stream header, if any */ if (avformat_write_header(formatContext, NULL)) { zj_printf("avformat_write_header -> fail\n"); } return 0; }

添加videostream并打开 

 static AVStream * add_video_stream(AVFormatContext *pFormatContext, AVOutputFormat *pOutputFormat, int wight, int height) { AVStream *stream = avformat_new_stream(pFormatContext, NULL); if (!stream) { zj_fprintf(stderr, "Could not alloc stream\n"); return NULL; } stream->id = 0; AVCodecContext *codecContext = stream->codec; codecContext->codec_id = pOutputFormat->video_codec; codecContext->codec_type = AVMEDIA_TYPE_VIDEO; /* resolution must be a multiple of two */ codecContext->width = wight; codecContext->height = height; /* time base: this is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented. for fixed-fps content, timebase should be 1/framerate and timestamp increments should be identically 1. */ if (wight==1280 && height == 720) { codecContext->bit_rate = 512000; STREAM_FRAME_RATE = 15; } else { codecContext->bit_rate = 384000; STREAM_FRAME_RATE = 20; } codecContext->time_base = (AVRational){1,STREAM_FRAME_RATE}; stream->time_base = (AVRational){1,STREAM_FRAME_RATE}; codecContext->max_b_frames = 0; codecContext->pix_fmt = AV_PIX_FMT_YUV420P; // these are the encoding params, here we do not need them // codecContext->gop_size = 12; //10 // codecContext->me_range = 16; // codecContext->max_qdiff = 4; // codecContext->qmin = 10; // codecContext->qmax = 31; if (pFormatContext->oformat->flags & AVFMT_GLOBALHEADER) codecContext->flags |= CODEC_FLAG_GLOBAL_HEADER; return stream; } static int open_video(AVFormatContext *pFormatContext, AVStream *pStream) { /* find the video encoder */ AVCodec *codec = avcodec_find_encoder(pStream->codec->codec_id); if (!codec) { return -1; } /* open the codec */ if (avcodec_open2(pStream->codec, codec, NULL)) { return -2; } return 0; }

写video帧 

 static int write_video_frame(char *buffer, int size) { int ret = 0; if (size > 0) { AVPacket mAVPacket; av_init_packet(&mAVPacket); mAVPacket.flags = isIFrame(buffer, size); mAVPacket.stream_index = video_st->index; mAVPacket.data = buffer; mAVPacket.size = size; mAVPacket.pts = video_PTS; mAVPacket.dts = video_PTS; video_PTS += 1; mAVPacket.pts = av_rescale_q_rnd(mAVPacket.pts, video_st->codec->time_base, video_st->time_base, (AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX)); mAVPacket.dts = av_rescale_q_rnd(mAVPacket.dts, video_st->codec->time_base, video_st->time_base, (AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX)); mAVPacket.duration = 0; mAVPacket.pos = -1; ret = av_interleaved_write_frame(formatContext, &mAVPacket); } av_packet_unref(&mAVPacket); } else { ret = -2; } if (ret != 0) { zj_printf("av_write_frame error:%d\n", ret); } return ret; }

在编解码器上下文中设置额外数据 

 unsigned char sps_pps[23] = {0x00, 0x00, 0x00, 0x01, 0x67, 0x64, 0x00, 0x29, 0xac, 0x1b, 0x1a, 0xc1, 0xe0, 0x51, 0x90, 0x00, 0x00, 0x00, 0x01, 0x68, 0xea, 0x43, 0xcb}; codecContext->extradata_size = 23; codecContext->extradata = av_malloc(23 + AV_INPUT_BUFFER_PADDING_SIZE); if (codecContext->extradata == NULL) { printf("could not av_malloc the video params extradata!\n"); return -1; } memcpy(codecContext->extradata, sps_pps, 23);

您的比特stream格式是附录b。 您必须通过replace具有最终长度值的开始代码来转换为MP4格式。 您还必须在codeccontext中填充extradata。 H.264stream的序列/图像参数集的可能位置

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