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。
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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packet
av_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 = (const AVCodecTag* const []) { flv_video_codec_ids, flv_audio_codec_ids, 0 }, .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT, .priv_class = &flv_muxer_class,};函数在在libavformat.h⾥⾯的定义
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/** * 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 */int avformat_alloc_output_context2(AVFormatContext **ctx, ff_const59 AVOutputFormat *oformat, const char *format_name, const char *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
", 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'
", 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_FILENAMEFF_DISABLE_DEPRECATION_WARNINGS av_strlcpy(s->filename, filename, sizeof(s->filename));FF_ENABLE_DEPRECATION_WARNINGS#endif if (!(s->url = av_strdup(filename))) goto nomem; } *avctx = s; return 0;nomem: av_log(s, AV_LOG_ERROR, "Out of memory
"); 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(const char *short_name, const char *filename, const char *mime_type){ const AVOutputFormat *fmt = NULL; AVOutputFormat *fmt_found = NULL; void *i = 0; int score_max, score; /* specific test for image sequences */#if CONFIG_IMAGE2_MUXER if (!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;}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）
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：
/** * @addtogroup lavf_encoding * @{ */typedef struct AVOutputFormat { const char *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. */ const char *long_name; const char *mime_type; const char *extensions; /**< comma-separated filename extensions */ /* output support */ enum AVCodecID audio_codec; /**< default audio codec */ enum AVCodecID video_codec; /**< default video codec */ enum AVCodecID 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. */ const struct AVCodecTag * const *codec_tag; const AVClass *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 struct AVOutputFormat *next; /** * size of private data so that it can be allocated in the wrapper */ int priv_data_size; int (*write_header)(struct AVFormatContext *); /** * 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)(struct AVFormatContext *, AVPacket *pkt); int (*write_trailer)(struct AVFormatContext *); /** * Currently only used to set pixel format if not YUV420P. */ int (*interleave_packet)(struct AVFormatContext *, 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)(enum AVCodecID id, int std_compliance); void (*get_output_timestamp)(struct AVFormatContext *s, int stream, int64_t *dts, int64_t *wall); /** * Allows sending messages from application to device. */ int (*control_message)(struct AVFormatContext *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)(struct AVFormatContext *, int stream_index, AVFrame **frame, unsigned flags); /** * Returns device list with it properties. * @see avdevice_list_devices() for more details. */ int (*get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list); /** * Initialize device capabilities submodule. * @see avdevice_capabilities_create() for more details. */ int (*create_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps); /** * Free device capabilities submodule. * @see avdevice_capabilities_free() for more details. */ int (*free_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps); enum AVCodecID 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)(struct AVFormatContext *); /** * 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)(struct AVFormatContext *); /** * 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)(struct AVFormatContext *, const AVPacket *pkt);} AVOutputFormat;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 = (const AVCodecTag* 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NULL。
int (*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。
AVStream 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, const AVCodec *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 , height
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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 packet。
/** * 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 other's 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
这⾥只是分析avformat_write_header和av_write_trailer的作⽤。
flv
只写avformat_write_header
000 File Header (9 bytes) 000 FLV header (9 bytes) 000 Signature: FLV 003 Version: 1 (0x01) 004 Flags: 5 (0x05) 005 Video: Yes 005 Audio: Yes 005 Size: 9 (0x00000009) 009 ------------------------- 009 --- FLV, accepted --- 009 ------------------------- 009 Meta - onMetaData - 12 elements (288 bytes) 009 Header (15 bytes) 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) - SCRIPTDATASTRING 019 Value_Size: 10 (0x000A) 01B Value: onMetaData 025 Type: 8 (0x08) -SCRIPTDATAVARIABLE[ECMAArrayLength] 026 ECMAArrayLength: 12 (0x0000000C) 02A duration (19 bytes) 02A StringLength: 8 (0x0008) 02C StringData: duration 034 Type: 0 (0x00) - DOUBLE 035 Value: 0.000 03D width - 352 (16 bytes) 03D StringLength: 5 (0x0005) 03F StringData: width044 Type: 0 (0x00) - DOUBLE 045 Value: 352.000 04D height - 288 (17 bytes) 04D StringLength: 6 (0x0006) 04F StringData: height 055 Type: 0 (0x00) - DOUBLE 056 Value: 288.000 05E videodatarate - 390625 (24 bytes) 05E StringLength: 13 (0x000D) 060 StringData: videodatarate 06D Type: 0 (0x00) - DOUBLE 06E Value: 390.625 076 videocodecid - 2 (23 bytes) 076 StringLength: 12 (0x000C) 078 StringData: videocodecid 084 Type: 0 (0x00) - DOUBLE 085 Value: 2.000 08D audiodatarate - 62500 (24 bytes) 08D StringLength: 13 (0x000D) 08F StringData: audiodatarate 09C Type: 0 (0x00) - DOUBLE 09D Value: 62.500 0A5 audiosamplerate - 44100 (26 bytes) 0A5 StringLength: 15 (0x000F) 0A7 StringData: audiosamplerate 0B6 Type: 0 (0x00) - DOUBLE 0B7 Value: 44100.000 0BF audiosamplesize - 16 (26 bytes) 0BF StringLength: 15 (0x000F) 0C1 StringData: audiosamplesize 0D0 Type: 0 (0x00) - DOUBLE 0D1 Value: 16.000 0D9 stereo - 1 (0x1) (10 bytes) 0D9 StringLength: 6 (0x0006) 0DB StringData: stereo 0E1 Type: 1 (0x01) - UI8 0E2 Value: 1 (0x01) 0E3 audiocodecid - 2 (23 bytes) 0E3 StringLength: 12 (0x000C) 0E5 StringData: audiocodecid0F1 Type: 0 (0x00) - DOUBLE 0F2 Value: 2.000 0FA encoder - Lavf58.29.100 (25 bytes) 0FA StringLength: 7 (0x0007) 0FC StringData: encoder 103 Type: 2 (0x02) - SCRIPTDATASTRING 104 Value_Size: 13 (0x000D) 106 Value: Lavf58.29.100 113 filesize (19 bytes) 113 StringLength: 8 (0x0008) 115 StringData: filesize 11D Type: 0 (0x00) - DOUBLE 11E Value: 0.000 129 End Of File (4 bytes) 129 Header (4 bytes) 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。
avformat_write_header
00 File Type (32 bytes) 00 Header (8 bytes) 00 Size: 32 (0x00000020) 04 Name: ftyp 08 MajorBrand: isom 0C MajorBrandVersion: 512 (0x00000200) 10 CompatibleBrand: isom 14 CompatibleBrand: iso2 18 CompatibleBrand: avc1 1C CompatibleBrand: mp41 20 ----------------------------20 --- MPEG-4, accepted --- 20 ---------------------------- 20 Free space (8 bytes) 20 Header (8 bytes) 20 Size: 8 (0x00000008) 24 Name: free 28 Junk (4 bytes) 28 Header (4 bytes) 28 Size: 0 (0x00000000) 2C Problem (4 bytes) 2C Header (4 bytes) 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_trailer
000 File Type (32 bytes) 000 Header (8 bytes) 000 Size: 32 (0x00000020) 004 Name: ftyp 008 MajorBrand: isom 00C MajorBrandVersion: 512 (0x00000200) 010 CompatibleBrand: isom 014 CompatibleBrand: iso2 018 CompatibleBrand: avc1 01C CompatibleBrand: mp41 020 ---------------------------- 020 --- MPEG-4, accepted --- 020 ---------------------------- 020 Free space (8 bytes) 020 Header (8 bytes) 020 Size: 8 (0x00000008) 024 Name: free 028 Data (8 bytes)028 Header (8 bytes) 028 Size: 8 (0x00000008) 02C Name: mdat 030 File header (214 bytes) 030 Header (8 bytes) 030 Size: 214 (0x000000D6) 034 Name: moov 038 Movie header (108 bytes) 038 Header (8 bytes) 038 Size: 108 (0x0000006C) 03C Name: mvhd 040 Version: 0 (0x00) 041 Flags: 0 (0x000000) 044 Creation time: 0 (0x00000000) - 048 Modification time: 0 (0x00000000) - 04C Time scale: 1000 (0x000003E8) - 1000 Hz 050 Duration: 0 (0x00000000) - 0 ms 054 Preferred rate: 65536 (0x00010000) - 1.000 058 Preferred volume: 256 (0x0100) - 1.000 05A Reserved: (10 bytes) 064 Matrix structure (36 bytes) 064 a (width scale): 1.000 068 b (width rotate): 0.000 06C u (width angle): 0.000 070 c (height rotate): 0.000 074 d (height scale): 1.000 078 v (height angle): 0.000 07C x (position left): 0.000 080 y (position top): 0.000 084 w (divider): 1.000 088 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) 0A4 User Data (98 bytes) 0A4 Header (8 bytes) 0A4 Size: 98 (0x00000062)0A8 Name: udta 0AC Metadata (90 bytes) 0AC Header (8 bytes) 0AC Size: 90 (0x0000005A) 0B0 Name: meta 0B4 Version: 0 (0x00) 0B5 Flags: 0 (0x000000) 0B8 Metadata Header (33 bytes) 0B8 Header (8 bytes) 0B8 Size: 33 (0x00000021) 0BC Name: hdlr 0C0 Version: 0 (0x00) 0C1 Flags: 0 (0x000000) 0C4 Type (Quicktime): 0C8 Metadata type: mdir 0CC Manufacturer: appl 0D0 Component reserved flags: 0 (0x00000000) 0D4 Component reserved flags mask: 0 (0x00000000) 0D8 Component type name: 0D9 List (45 bytes) 0D9 Header (8 bytes) 0D9 Size: 45 (0x0000002D) 0DD Name: ilst 0E1 Element (37 bytes) 0E1 Header (8 bytes) 0E1 Size: 37 (0x00000025) 0E5 Name: ﹖oo 0E9 Data - Encoded_Application (29 bytes) 0E9 Header (8 bytes) 0E9 Size: 29 (0x0000001D) 0ED Name: data 0F1 Kind: 1 (0x00000001) - UTF8 0F5 Language: 0 (0x00000000) 0F9 Value: Lavf58.29.100 106 --------------------------- 106 --- MPEG-4, filling --- 106 --------------------------- 106 ---------------------------- 106 --- MPEG-4, finished --- 106 ----------------------------| 留言与评论（共有 0 条评论） “” |
