居然可以这样flv合并(flv视频合并)

C++音视频开发学习资料:点击领取→音视频开发。ffmpeg 的 Mux 主要分为 三步操作:avformat_write_header : 写

 

FFmpeg合成流程示例本程序会⽣成⼀个合成的⾳频和视频流，并将它们编码和封装输出到输出⽂件，输出格式是根据⽂件 扩展名⾃动猜测的。示例的流程图如下所示。

C++音视频开发学习资料：点击领取→音视频开发（资料文档+视频教程+面试题）（FFmpeg+WebRTC+RTMP+RTSP+HLS+RTP）ffmpeg 的 Mux 主要分为 三步操作：avformat_write_header ： 写⽂件头

av_write_frame/av_interleaved_write_frame： 写packetav_write_trailer ： 写⽂件尾avcodec_parameters_from_context：

将AVCodecContext结构体中码流参数拷⻉到AVCodecParameters结构体中，和avcodec_parameters_to_context刚好相反FFmpeg函数：avformat_write_header。

int avformat_write_header(AVFormatContext *s, AVDictionary **options) { int ret = 0; int already_initialized = s->internal->initialized; int streams_already_initialized = s->internal->streams_initialized;

if (!already_initialized) if ((ret = avformat_init_output(s, options)) < 0) return

ret; if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb) avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_HEADER);

if (s->oformat->write_header) { ret = s->oformat->write_header(s); if (ret >= 0 && s->pb && s->pb->error <

0) ret = s->pb->error; if (ret < 0) goto fail; flush_if_needed(s); }

if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb) avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_UNKNOWN);

if (!s->internal->streams_initialized) { if ((ret = init_pts(s)) < 0) goto fail; }

return streams_already_initialized; fail: if (s->oformat->deinit) s->oformat->deinit(s);

return ret; } 最终调⽤到复⽤器的 write_header，⽐如AVOutputFormat ff_flv_muxer = { .name = "flv", .long_name = NULL_IF_CONFIG_SMALL(

"FLV (Flash Video)"), .mime_type = "video/x-flv", .extensions = "flv", .priv_data_size =

sizeof(FLVContext), .audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF

, .video_codec = AV_CODEC_ID_FLV1, .init = flv_init, .write_header = flv_write_header, .write_packet = flv_write_packet, .write_trailer = flv_write_trailer, .check_bitstream= flv_check_bitstream, .codec_tag = (

constAVCodecTag* const []) { flv_video_codec_ids, flv_audio_codec_ids, 0 }, .flags =

AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT, .priv_class = &flv_muxer_class, };

FFmpeg结构体：avformat_alloc_output_context2函数在在libavformat.h⾥⾯的定义C++音视频开发学习资料：点击领取→音视频开发（资料文档+视频教程+面试题）（FFmpeg+WebRTC+RTMP+RTSP+HLS+RTP）

/** * Allocate an AVFormatContext for an output format. * avformat_free_context() can be used to free the context and * everything allocated by the framework within it. * *

@param *ctx is set to the created format context, or to NULL in * case of failure * @param oformat format to use for allocating the context, if NULL * format_name and filename are used instead *

@param format_name the name of output format to use for allocating the * context, if NULL filename is used instead *

@param filename the name of the filename to use for allocating the * context, may be NULL * @return

>= 0 in case of success, a negative AVERROR code in case of * failure */intavformat_alloc_output_context2

(AVFormatContext **ctx, ff_const59 AVOutputFormat *oformat, constchar

*format_name, constchar *filename); 函数参数的介绍：ctx:需要创建的context，返回NULL表示失败oformat:指定对应的AVOutputFormat，如果不指定，可以通过后⾯format_name、filename两个参 数进⾏指定，让ffmpeg⾃⼰推断。

format_name: 指定⾳视频的格式，⽐如“flv”，“mpeg”等，如果设置为NULL，则由filename进⾏指 定，让ffmpeg⾃⼰推断filename: 指定⾳视频⽂件的路径，如果oformat、format_name为NULL，则ffmpeg内部根据 filename后缀名选择合适的复⽤器，⽐如xxx.flv则使⽤flv复⽤器。

int avformat_alloc_output_context2(AVFormatContext **avctx, ff_const59 AVOutputFormat *oformat,

const char *format, const char *filename) { AVFormatContext *s = avformat_alloc_context(); int ret =

0; *avctx = NULL; if (!s) goto nomem; if (!oformat) { if (format) { oformat = av_guess_format(format,

NULL, NULL); if (!oformat) { av_log(s, AV_LOG_ERROR, "Requested output format %s is not a suitable output format\n"

, format); ret = AVERROR(EINVAL); goto error; } }

else { oformat = av_guess_format(NULL, filename, NULL); if (!oformat) { ret = AVERROR(EINVAL); av_log(s, AV_LOG_ERROR,

"Unable to find a suitable output format for %s\n", filename);

goto error; } } } s->oformat = oformat; if (s->oformat->priv_data_size >

0) { s->priv_data = av_mallocz(s->oformat->priv_data_size); if (!s->priv_data)

goto nomem; if (s->oformat->priv_class) { *(const AVClass**)s->priv_data= s->oformat->priv_class; av_opt_set_defaults(s->priv_data); } }

else s->priv_data = NULL; if (filename) { #if FF_API_FORMAT_FILENAME FF_DISABLE_DEPRECATION_WARNINGS av_strlcpy(s->filename, filename, sizeof(s->filename)); FF_ENABLE_DEPRECATION_WARNINGS

#endifif (!(s->url = av_strdup(filename))) goto nomem; } *avctx = s; return0

; nomem: av_log(s, AV_LOG_ERROR, "Out of memory\n"); ret = AVERROR(ENOMEM); error: avformat_free_context(s);

return ret; } 可以看出，⾥⾯最主要的就两个函数，avformat_alloc_context和av_guess_format，⼀个 是申请内存分配上下⽂，⼀个是通过后⾯两个参数获取AVOutputFormat。

出av_guess_format这个函数会通过filename和short_name来和所有的编码器进⾏⽐对，找 出最接近的编码器然后返回ff_const59 AVOutputFormat *av_guess_format(。

constchar *short_name, constchar *filename, constchar *mime_type) {

constAVOutputFormat *fmt = NULL; AVOutputFormat *fmt_found = NULL; void *i = 0; int score_max, score;

/* specific test for image sequences */#if CONFIG_IMAGE2_MUXERif (!short_name && filename && av_filename_number_test(filename) && ff_guess_image2_codec(filename) !=

AV_CODEC_ID_NONE) { return av_guess_format("image2", NULL, NULL); } #endif/* Find the proper file type. */

score_max = 0; while ((fmt = av_muxer_iterate(&i))) { score = 0; if (fmt->name && short_name && av_match_name(short_name, fmt->name)) score +=

100; if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type)) score +=

10; if (filename && fmt->extensions && av_match_ext(filename, fmt->extensions)) { score +=

5; } if (score > score_max) { score_max = score; fmt_found = (

AVOutputFormat*)fmt; } } return fmt_found; } FFmpeg结构体：AVOutputFormatC++音视频开发学习资料：点击领取

→音视频开发（资料文档+视频教程+面试题）（FFmpeg+WebRTC+RTMP+RTSP+HLS+RTP）1.描述AVOutpufFormat表示输出⽂件容器格式，AVOutputFormat 结构主要包含的信息有：封装名称描述，编 码格式信息(video/audio 默认编码格式，⽀持的编码格式列表)，⼀些对封装的操作函数 (write_header,write_packet,write_tailer等)。

ffmpeg⽀持各种各样的输出⽂件格式，MP4，FLV，3GP等等⽽ AVOutputFormat 结构体则保存了这 些格式的信息和⼀些常规设置 每⼀种封装对应⼀个 AVOutputFormat 结构，ffmpeg将AVOutputFormat 按照链表存储：。

2.结构体定义/** * @addtogroup lavf_encoding * @{ */typedefstructAVOutputFormat { constchar *name;

/** * Descriptive name for the format, meant to be more human-readable * than name. You should use the NULL_IF_CONFIG_SMALL() macro * to define it. */

constchar *long_name; constchar *mime_type; constchar *extensions; /**< comma-separated filename extensions */

/* output support */enumAVCodecID audio_codec; /**< default audio codec */enumAVCodecID video_codec;

/**< default video codec */enumAVCodecID subtitle_codec; /**< default subtitle codec *//** * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS, * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH, * AVFMT_TS_NONSTRICT, AVFMT_TS_NEGATIVE */

int flags; /** * List of supported codec_id-codec_tag pairs, ordered by "better * choice first". The arrays are all terminated by AV_CODEC_ID_NONE. */

conststructAVCodecTag * const *codec_tag; constAVClass *priv_class; ///< AVClass for the private context

/***************************************************************** * No fields below this line are part of the public API. They * may not be used outside of libavformat and can be changed and * removed at will. * New public fields should be added right above. ***************************************************************** */

/** * The ff_const59 define is not part of the public API and will * be removed without further warning. */

#if FF_API_AVIOFORMAT#define ff_const59#else#define ff_const59 const#endif ff_const59 structAVOutputFormat

*next; /** * size of private data so that it can be allocated in the wrapper */int priv_data_size;

int (*write_header)(structAVFormatContext *); /** * Write a packet. If AVFMT_ALLOW_FLUSH is set in flags, * pkt can be NULL in order to flush data buffered in the muxer. * When flushing, return 0 if there still is more data to flush, * or 1 if everything was flushed and there is no more buffered * data. */

int (*write_packet)(structAVFormatContext *, AVPacket *pkt); int (*write_trailer)(structAVFormatContext

*); /** * Currently only used to set pixel format if not YUV420P. */int (*interleave_packet)(

structAVFormatContext *, AVPacket *out, AVPacket *in, int flush); /** * Test if the given codec can be stored in this container. * * @return 1 if the codec is supported, 0 if it is not. * A negative number if unknown. * MKTAG(A, P, I, C) if the codec is only supported as AV_DISPOSITION_ATTACHED_PIC */

int (*query_codec)(enumAVCodecIDid, int std_compliance); void (*get_output_timestamp)(structAVFormatContext

*s, int stream, int64_t *dts, int64_t *wall); /** * Allows sending messages from application to device. */

int (*control_message)(structAVFormatContext *s, int type, void *data, size_t data_size);

/** * Write an uncoded AVFrame. * * See av_write_uncoded_frame() for details. * * The library will free *frame afterwards, but the muxer can prevent it * by setting the pointer to NULL. */

int (*write_uncoded_frame)(structAVFormatContext *, int stream_index,

AVFrame **frame, unsigned flags); /** * Returns device list with it properties. * @see avdevice_list_devices() for more details. */

int (*get_device_list)(structAVFormatContext *s, structAVDeviceInfoList *device_list); /** * Initialize device capabilities submodule. * @see avdevice_capabilities_create() for more details. */

int (*create_device_capabilities)(structAVFormatContext *s, structAVDeviceCapabilitiesQuery *caps);

/** * Free device capabilities submodule. * @see avdevice_capabilities_free() for more details. */

int (*free_device_capabilities)(structAVFormatContext *s, structAVDeviceCapabilitiesQuery *caps);

enumAVCodecID data_codec; /**< default data codec *//** * Initialize format. May allocate data here, and set any AVFormatContext or * AVStream parameters that need to be set before packets are sent. * This method must not write output. * * Return 0 if streams were fully configured, 1 if not, negative AVERROR on failure * * Any allocations made here must be freed in deinit(). */

int (*init)(structAVFormatContext *); /** * Deinitialize format. If present, this is called whenever the muxer is being * destroyed, regardless of whether or not the header has been written. * * If a trailer is being written, this is called after write_trailer(). * * This is called if init() fails as well. */

void (*deinit)(structAVFormatContext *); /** * Set up any necessary bitstream filtering and extract any extra data needed * for the global header. * Return 0 if more packets from this stream must be checked; 1 if not. */

int (*check_bitstream)(structAVFormatContext *, constAVPacket *pkt); } AVOutputFormat; 3.常用变量及其作⽤const char *name; // 复⽤器名称

const char *long_name;//格式的描述性名称，易于阅读enum AVCodecID audio_codec; //默认的⾳频编解码器enum AVCodecID video_codec; //默认的视频编解码器。

enum AVCodecID subtitle_codec; //默认的字幕编解码器⼤部分复⽤器都有默认的编码器，所以⼤家如果要调整编码器类型则需要⾃⼰⼿动指定比如AVOutputFormat ff_flv_muxer = { .name = 。

"flv", .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"), .mime_type = "video/x-flv"

, .extensions = "flv", .priv_data_size = sizeof(FLVContext), .audio_codec = CONFIG_LIBMP3LAME ?

AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF, .video_codec = AV_CODEC_ID_FLV1, .init = flv_init, .write_header = flv_write_header, .write_packet = flv_write_packet, .write_trailer = flv_write_trailer, .check_bitstream= flv_check_bitstream, .codec_tag = (

constAVCodecTag* const []) { flv_video_codec_ids, flv_audio_codec_ids, 0 }, .flags =

AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT, .priv_class = &flv_muxer_class, };

AVOutputFormat ff_mpegts_muxer = { .name = "mpegts", .long_name = NULL_IF_CONFIG_SMALL(

"MPEG-TS (MPEG-2 Transport Stream)"), .mime_type = "video/MP2T", .extensions = "ts,m2t,m2ts,mts"

, .priv_data_size = sizeof(MpegTSWrite), .audio_codec = AV_CODEC_ID_MP2, .video_codec =

AV_CODEC_ID_MPEG2VIDEO, .init = mpegts_init, .write_packet = mpegts_write_packet, .write_trailer = mpegts_write_end, .deinit = mpegts_deinit, .check_bitstream = mpegts_check_bitstream, .flags =

AVFMT_ALLOW_FLUSH | AVFMT_VARIABLE_FPS | AVFMT_NODIMENSIONS, .priv_class = &mpegts_muxer_class, };

int (*write_header)(struct AVFormatContext *);int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);//写⼀个数据包。

如果在标志中设 置AVFMT_ALLOW_FLUSH，则pkt可以为NULLint (*write_trailer)(struct AVFormatContext *);int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);

int (*control_message)(struct AVFormatContext *s, int type, void *data, size_t data_size);//允 许从应⽤程序向设备发送消息。

int (*write_uncoded_frame)(struct AVFormatContext *, int stream_index, AVFrame **frame, unsigned flags);//写⼀个未编码的AVFrame。

int (*init)(struct AVFormatContext *);//初始化格式 可以在此处分配数据，并设置在发送数据包之前 需要设置的任何AVFormatContext或AVStream参数。

void (*deinit)(struct AVFormatContext *);//取消初始化格式int (*check_bitstream)(struct AVFormatContext *, const AVPacket *pkt);//设置任何必要的⽐特流 过滤，并提取全局头部所需的任何额外数据。

FFmpeg函数：avformat_new_streamAVStream 即是流通道例如我们将 H264 和 AAC 码流存储为MP4⽂件的时候，就需要在 MP4⽂件中 增加两个流通道，⼀个存储Video：H264，⼀个存储Audio：AAC。

（假设H264和AAC只包含单个流通道）/** * Add a new stream to a media file. * * When demuxing, it is called by the demuxer in read_header(). If the * flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also * be called in read_packet(). * * When muxing, should be called by the user before avformat_write_header(). * * User is required to call avcodec_close() and avformat_free_context() to * clean up the allocation by avformat_new_stream(). * * @param s media file handle * @param c If non-NULL, the AVCodecContext corresponding to the new stream * will be initialized to use this codec. This is needed for e.g. codec-specific * defaults to be set, so codec should be provided if it is known. * * @return newly created stream or NULL on error. */

AVStream *avformat_new_stream(AVFormatContext *s, constAVCodec *c); avformat_new_stream 在 AVFormatContext 中创建 Stream 通道。

关联的结构体AVFormatContext ：unsigned int nb_streams; 记录stream通道数⽬AVStream **streams; 存储stream通道AVStream ： int index; 在AVFormatContext 中所处的通道索引。

avformat_new_stream之后便在 AVFormatContext ⾥增加了 AVStream 通道（相关的index已经被设 置了）之后，我们就可以⾃⾏设置 AVStream 的⼀些参数信息。

例如 : codec_id , format ,bit_rate ,width , heightFFmpeg函数：av_interleaved_write_frameC++音视频开发学习资料：点击领取→

音视频开发（资料文档+视频教程+面试题）（FFmpeg+WebRTC+RTMP+RTSP+HLS+RTP）函数原型：int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);

说明：将数据包写⼊输出媒体⽂件，并确保正确的交织（保持packet dts的增⻓性） 该函数会在内部根据需要缓存packet，以确保输出⽂件中的packet按dts递增的顺序正确交织如果⾃⼰ 进⾏交织则应调⽤av_write_frame()。

参数：

返回值：成功时为0，错误时为负AVERROR即使此函数调⽤失败，Libavformat仍将始终释放该 packetFFmpeg函数：av_compare_ts/** * Compare two timestamps each in its own time base. 。

* * @return One of the following values: * - -1 if `ts_a` is before `ts_b` * - 1 if

`ts_a` is after `ts_b` * - 0 if they represent the same position * * @warning * The result of the function is undefined if one of the timestamps is outside

* the `int64_t` range when represented in the others timebase. */ int av_compare_ts(int64_t ts_a, AVRational tb

_a, int64_t ts_b, AVRational tb_b); 返回值：-1 ts_a 在ts_b之前1 ts_a 在ts_b之后0 ts_a 在ts_b同⼀位置⽤伪代码：return ts_a == ts_b ? 0 : ts_a < ts_b ? -1 : 1

MediaInfo分析⽂件写⼊这⾥只是分析avformat_write_header和av_write_trailer的作⽤flv只写avformat_write_header000FileHeader。

(9bytes)000FLVheader(9bytes)000 Signature:FLV003 Version:1(0x01)004 Flags:5(0x05)005 Video:Yes005 Audio:

Yes005 Size:9(0x00000009)009-------------------------009---FLV,accepted---009-------------------------

009Meta-onMetaData-12elements(288bytes)009Header(15bytes)009 PreviousTagSize:0(0x00000000)00D Type:18

(0x12)00E BodyLength:273(0x000111)011 Timestamp_Base:0(0x000000)014 Timestamp_Extended:0(0x00)015 StreamID:

0(0x000000)018 Type:2(0x02)-SCRIPTDATASTRING019 Value_Size:10(0x000A)01B Value:onMetaData025 Type:8(0x08)

-SCRIPTDATAVARIABLE[ECMAArrayLength]026 ECMAArrayLength:12(0x0000000C)02Aduration(19bytes)02A StringLength:

8(0x0008)02C StringData:duration034 Type:0(0x00)-DOUBLE035 Value:0.00003Dwidth-352(16bytes)03D StringLength:

5(0x0005)03F StringData:width044 Type:0(0x00)-DOUBLE045 Value:352.00004Dheight-288(17bytes)04D StringLength:

6(0x0006)04F StringData:height055 Type:0(0x00)-DOUBLE056 Value:288.00005Evideodatarate-390625(24bytes)

05E StringLength:13(0x000D)060 StringData:videodatarate06D Type:0(0x00)-DOUBLE06E Value:390.625076videocodecid

-2(23bytes)076 StringLength:12(0x000C)078 StringData:videocodecid084 Type:0(0x00)-DOUBLE085 Value:2.000

08Daudiodatarate-62500(24bytes)08D StringLength:13(0x000D)08F StringData:audiodatarate09C Type:0(0x00)

-DOUBLE09D Value:62.5000A5audiosamplerate-44100(26bytes)0A5 StringLength:15(0x000F)0A7 StringData:audiosamplerate

0B6 Type:0(0x00)-DOUBLE0B7 Value:44100.0000BFaudiosamplesize-16(26bytes)0BF StringLength:15(0x000F)0C1 StringData:

audiosamplesize0D0 Type:0(0x00)-DOUBLE0D1 Value:16.0000D9stereo-1(0x1)(10bytes)0D9 StringLength:6(0x0006)

0DB StringData:stereo0E1 Type:1(0x01)-UI80E2 Value:1(0x01)0E3audiocodecid-2(23bytes)0E3 StringLength:

12(0x000C)0E5 StringData:audiocodecid0F1 Type:0(0x00)-DOUBLE0F2 Value:2.0000FAencoder-Lavf58.29.100(25

bytes)0FA StringLength:7(0x0007)0FC StringData:encoder103 Type:2(0x02)-SCRIPTDATASTRING104 Value_Size:

13(0x000D)106 Value:Lavf58.29.100113filesize(19bytes)113 StringLength:8(0x0008)115 StringData:filesize

11D Type:0(0x00)-DOUBLE11E Value:0.000129EndOfFile(4bytes)129Header(4bytes)129 PreviousTagSize:284(0x0000011C)

12D------------------------12D---FLV,filling---12D------------------------12D-------------------------

12D---FLV,finished---12D-------------------------avformat_write_header+ av_write_trailer 对于FLV⽽⾔没有任何变化。

mp4avformat_write_header00FileType(32bytes)00Header(8bytes)00 Size:32(0x00000020)04 Name:ftyp08 MajorBrand:

isom0C MajorBrandVersion:512(0x00000200)10 CompatibleBrand:isom14 CompatibleBrand:iso218 CompatibleBrand:

avc11C CompatibleBrand:mp4120----------------------------20---MPEG-4,accepted---20----------------------------

20Freespace(8bytes)20Header(8bytes)20 Size:8(0x00000008)24 Name:free28Junk(4bytes)28Header(4bytes)28 Size:

0(0x00000000)2CProblem(4bytes)2CHeader(4bytes)2C Size:1835295092(0x6D646174)30 Size is wrong:0(0x00000000)

30---------------------------30---MPEG-4,filling---30---------------------------30----------------------------

30---MPEG-4,finished---30----------------------------avformat_write_header+av_write_trailer000FileType

(32bytes)000Header(8bytes)000 Size:32(0x00000020)004 Name:ftyp008 MajorBrand:isom00C MajorBrandVersion:

512(0x00000200)010 CompatibleBrand:isom014 CompatibleBrand:iso2018 CompatibleBrand:avc101C CompatibleBrand:

mp41020----------------------------020---MPEG-4,accepted---020----------------------------020Freespace

(8bytes)020Header(8bytes)020 Size:8(0x00000008)024 Name:free028Data(8bytes)028Header(8bytes)028 Size:

8(0x00000008)02C Name:mdat030Fileheader(214bytes)030Header(8bytes)030 Size:214(0x000000D6)034 Name:moov

038Movieheader(108bytes)038Header(8bytes)038 Size:108(0x0000006C)03C Name:mvhd040 Version:0(0x00)041 Flags:

0(0x000000)044 Creation time:0(0x00000000)-048 Modification time:0(0x00000000)-04C Time scale:1000(0x000003E8)

-1000Hz050 Duration:0(0x00000000)-0ms054 Preferred rate:65536(0x00010000)-1.000058 Preferred volume:256

(0x0100)-1.00005A Reserved:(10bytes)064Matrixstructure(36bytes)064a(widthscale):1.000068b(widthrotate):

0.00006Cu(widthangle):0.000070c(heightrotate):0.000074d(heightscale):1.000078v(heightangle):0.00007Cx

(positionleft):0.000080y(positiontop):0.000084w(divider):1.000088 Preview time:0(0x00000000)08C Preview duration:

0(0x00000000)090 Poster time:0(0x00000000)094 Selection time:0(0x00000000)098 Selection duration:0(0x00000000)

09C Current time:0(0x00000000)0A0 Next track ID:2(0x00000002)0A4UserData(98bytes)0A4Header(8bytes)0A4 Size:

98(0x00000062)0A8 Name:udta0ACMetadata(90bytes)0ACHeader(8bytes)0AC Size:90(0x0000005A)0B0 Name:meta0B4 Version:

0(0x00)0B5 Flags:0(0x000000)0B8MetadataHeader(33bytes)0B8Header(8bytes)0B8 Size:33(0x00000021)0BC Name:

hdlr0C0 Version:0(0x00)0C1 Flags:0(0x000000)0C4Type(Quicktime):0C8 Metadata type:mdir0CC Manufacturer:

appl0D0 Component reserved flags:0(0x00000000)0D4 Component reserved flags mask:0(0x00000000)0D8 Component type name:

0D9List(45bytes)0D9Header(8bytes)0D9 Size:45(0x0000002D)0DD Name:ilst0E1Element(37bytes)0E1Header(8bytes)

0E1 Size:37(0x00000025)0E5 Name:﹖oo0E9Data-Encoded_Application(29bytes)0E9Header(8bytes)0E9 Size:29(0x0000001D)

0ED Name:data0F1 Kind:1(0x00000001)-UTF80F5 Language:0(0x00000000)0F9 Value:Lavf58.29.100106---------------------------

106---MPEG-4,filling---106---------------------------106----------------------------106---MPEG-4,finished

---106----------------------------