本文主要是介绍使用MP4V2分析MP4文件，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
一、下载链接
http://download.csdn.net/download/u011425939/10149476
二、解压源码
得到 libmp4目录
三、进入test目录使用帮助
root@ubuntu16:/work/my/code/mp4/mp4v2/libmp4/test# ./mp4_tool -h
usage: mp4_tool <options> mp4_file
Options:
-h, -?, --help List the more commonly used options
-a, --add <string> Add a track to the mp4 file,(Todo)
-e, --extract <integer> Extract a track from the mp4 file
-i, --info <integer> List tracks info from the mp4 file
-r, --show_rap <integer> Show one track random access point
-v, --verbosity <integer> Control amount of the log
root@ubuntu16:/work/my/code/mp4/mp4v2/libmp4/test# 四、输出一个MP4文件的信息
root@ubuntu16:/work/my/code/mp4/mp4v2/libmp4/test# ./mp4_tool -i Showreel.mp4Movie info Timescale: 600, duration: 71680000, creation_time: 3377085776, modification_time: 3377172176 Number of tracks: 2 Track # 0 Info: - Track_id: 1, is_track_enable: 1, duration: 42960
Media info: timescale: 25000, media_duration: 71600000, type: vide, sub type: avc1, 1790 samples
video info: w:1280 h720
max sample size: 74216
nr of samples: 1790
media sub type: 1635148593 Track # 1 Info: - Track_id: 2, is_track_enable: 1, duration: 43008
Media info: timescale: 44100, media_duration: 71680000, type: soun, sub type: mp4a, 3087samples
audio info: sample_rate: 44100, channels: 2, bits_per_sample: 16
五、lib_mp4.h中的 api 接口 使用它们可以得到相应的信息。
1、uint8_t mp4_probe(const char *file_name );/* open a mp4 file and get the handle */
2、mp4_handle_t* mp4_open( const char* file_name, int mode );/* close the mp4 handle */
3、void mp4_close( mp4_handle_t *handle );4、void mp4_set_verbosity( uint32_t verbosity );5、uint32_t mp4_get_verbosity( void );/*return the timescale of the movie, 0 if error*/
6、uint32_t mp4_get_timescale(mp4_handle_t *handle);/*return the duration of the movie, 0 if error*/
7、uint64_t mp4_get_duration(mp4_handle_t *handle);/*return the creation info of the movie*/
8、int mp4_get_creation_time(mp4_handle_t *handle, uint64_t *creation_time,uint64_t *modification_time);
/*return the number of tracks in the movie*/
9、uint32_t mp4_get_nr_of_tracks( mp4_handle_t *handle );/*** return the track id of track index n, or 0 if error* the valid index range is [0, nr_track-1]
*/
10、uint32_t mp4_get_track_id(mp4_handle_t *handle, uint32_t index);/*return the track number of the track of specified ID, or 0 if error*/
11、uint32_t mp4_get_track_idx_by_id(mp4_handle_t *handle, uint32_t track_id);/*gets the enable flag of a track 0: NO, 1: YES, 2: error*/
12、uint8_t mp4_is_track_enabled(mp4_handle_t *handle, uint32_t track_id);/* determines if the track is encrypted 0: NO, 1: YES, 2: error*/
13、uint8_t mp4_is_track_encrypted(mp4_handle_t *handle, uint32_t track_id);/*get the track duration return 0 if bad param*/
14、uint64_t mp4_get_track_duration(mp4_handle_t *handle, uint32_t track_id);/*return the media type FOUR CHAR code type of the media(soun, vide, hint)*/
15、uint32_t mp4_get_media_type(mp4_handle_t *handle, uint32_t track_id);/*return the media sub type FOUR CHAR code type of the media(mp4a, mp4v, avc1...)*/
16、uint32_t mp4_get_media_sub_type(mp4_handle_t *handle, uint32_t track_id);/* get esds decconfigDescr info, or -1 if esd is NULL */
17、int mp4_get_esds_dec_config_info(mp4_handle_t *handle, uint32_t track_id,uint8_t *object_type_ind, uint8_t *stream_type,uint8_t *up_stream, uint32_t *buf_size_db,uint32_t *max_bitrate, uint32_t *avg_bitrate );/* get esds decConfigDescr decSpecificInfo */
18、int mp4_get_esds_dec_specific_info(mp4_handle_t *handle, uint32_t track_id,uint8_t**config, uint32_t* config_size );/*get the timescale of media*/
19、uint32_t mp4_get_media_timescale(mp4_handle_t *handle, uint32_t track_id);/*get duration of the media(without edit) */
20、uint64_t mp4_get_media_duration(mp4_handle_t *handle, uint32_t track_id);/*get width, height of the given visual sample desc
return -1 if not a visual track */
21、int mp4_get_visual_info(mp4_handle_t *handle, uint32_t track_id,uint32_t *width, uint32_t *height);/*get samplerate, channels and bps, version of the given audio trackreturn -1 if not a audio track*/
22、int mp4_get_audio_info(mp4_handle_t *handle, uint32_t track_id,uint32_t *sample_rate, uint32_t *channels,uint8_t *bits_per_sample, uint8_t *version );/*return the numbers of samples */
23、uint32_t mp4_get_nr_of_samples(mp4_handle_t *handle,uint32_t track_id);/*return the max sample size of the track */
24、uint32_t mp4_get_max_sample_size(mp4_handle_t *handle,uint32_t track_id);/*return the sample size of the track sample, or 0 if error */
25、uint32_t mp4_get_sample_size(mp4_handle_t *handle,uint32_t track_id, uint32_t sample_id);/* return sample id by the time */
26、uint32_t mp4_get_sample_from_time(mp4_handle_t *handle, uint32_t track_id,uint64_t when, uint8_t search_mode );/* get sample time, it's dts */
27、uint64_t mp4_get_sample_dts(mp4_handle_t *handle, uint32_t track_id, uint32_t sample_id );/* get sample duration in media time scale*/
28、uint64_t mp4_get_sample_duration(mp4_handle_t *handle, uint32_t track_id, uint32_t sample_id );/* get avc decoder cfg info, memory is allocate and free by library, return <0 if error */
29、int mp4_get_track_h264_seq_pic_headers(mp4_handle_t *handle, uint32_t track_id,uint8_t *nr_of_seq_hdr,char ***seq_hdr,uint16_t **seq_hdr_size,uint8_t *nr_of_pic_hdr,char ***pic_hdr,uint16_t **pic_hdr_size);/* get avc decConfig info */
30、int mp4_get_track_h264_dec_config_info(mp4_handle_t *handle, uint32_t track_id,uint8_t *nalu_size, uint8_t *cfg_ver,uint8_t *profile_ind, uint8_t *profile_comp,uint8_t *level_ind );/* read a sample by sample id, return < 0 if error */
31、int mp4_read_sample( mp4_handle_t *handle, uint32_t track_id, uint32_t sample_id,char *buf, uint32_t* size,uint64_t *DTS, uint64_t *CTS,uint64_t *duration_time, uint8_t *is_sync );/* read a sample by given a desired decoding time IN MEDIA TIME SCALE, return< 0 if error */
32、int mp4_read_sample_from_time( mp4_handle_t *handle, uint32_t track_id, uint64_t when,uint8_t search_mode,char *buf, uint32_t* size,uint64_t *DTS, uint64_t *CTS,uint64_t *duration_time );/* convert FOURCC to string */
33、int mp4_fourcc_to_str(uint32_t type, char *str, int str_len);
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